forked from forks/qmk_firmware
HD44780 driver rework (#16370)
This commit is contained in:
Ryan
GitHub
parent
86b5c6b5c3
commit
9ee2effe8e
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@ -646,8 +646,9 @@ ifeq ($(strip $(HAPTIC_ENABLE)),yes)
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endif
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ifeq ($(strip $(HD44780_ENABLE)), yes)
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SRC += platforms/avr/drivers/hd44780.c
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OPT_DEFS += -DHD44780_ENABLE
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COMMON_VPATH += $(DRIVER_PATH)/lcd
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SRC += hd44780.c
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endif
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VALID_OLED_DRIVER_TYPES := SSD1306 custom
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@ -94,7 +94,7 @@
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* Hardware Features
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* Displays
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* [HD44780 LCD Controller](feature_hd44780.md)
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* [HD44780 LCD Driver](feature_hd44780.md)
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* [ST7565 LCD Driver](feature_st7565.md)
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* [OLED Driver](feature_oled_driver.md)
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* Lighting
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@ -1,57 +1,298 @@
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# HD44780 LCD Displays
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# HD44780 LCD Driver
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This is an integration of Peter Fleury's LCD library. This page will explain the basics. [For in depth documentation visit his page.](http://www.peterfleury.epizy.com/doxygen/avr-gcc-libraries/group__pfleury__lcd.html)
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## Supported Hardware
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You can enable support for HD44780 Displays by setting the `HD44780_ENABLE` flag in your keyboards `rules.mk` to yes.
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LCD modules using [HD44780U](https://www.sparkfun.com/datasheets/LCD/HD44780.pdf) IC or equivalent, communicating in 4-bit mode.
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## Configuration
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|Module|Size |Notes |
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|------|--------------|---------------------------------|
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|1602A |16x2, 5x8 dots| |
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|2004A |20x4, 5x8 dots|Untested, not currently supported|
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You will need to configure the pins used by your display, and its number of lines and columns in your keyboard's `config.h`.
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Uncomment the section labled HD44780 and change the parameters as needed.
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````
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/*
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* HD44780 LCD Display Configuration
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*/
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#define LCD_LINES 2 //< number of visible lines of the display
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#define LCD_DISP_LENGTH 16 //< visibles characters per line of the display
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#define LCD_IO_MODE 1 //< 0: memory mapped mode, 1: IO port mode
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#if LCD_IO_MODE
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#define LCD_PORT PORTB //< port for the LCD lines
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#define LCD_DATA0_PORT LCD_PORT //< port for 4bit data bit 0
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#define LCD_DATA1_PORT LCD_PORT //< port for 4bit data bit 1
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#define LCD_DATA2_PORT LCD_PORT //< port for 4bit data bit 2
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#define LCD_DATA3_PORT LCD_PORT //< port for 4bit data bit 3
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#define LCD_DATA0_PIN 4 //< pin for 4bit data bit 0
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#define LCD_DATA1_PIN 5 //< pin for 4bit data bit 1
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#define LCD_DATA2_PIN 6 //< pin for 4bit data bit 2
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#define LCD_DATA3_PIN 7 //< pin for 4bit data bit 3
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#define LCD_RS_PORT LCD_PORT //< port for RS line
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#define LCD_RS_PIN 3 //< pin for RS line
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#define LCD_RW_PORT LCD_PORT //< port for RW line
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#define LCD_RW_PIN 2 //< pin for RW line
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#define LCD_E_PORT LCD_PORT //< port for Enable line
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#define LCD_E_PIN 1 //< pin for Enable line
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#endif
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````
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Should you need to configure other properties you can copy them from `quantum/hd44780.h` and set them in your `config.h`
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To run these modules at 3.3V, an additional MAX660 voltage converter IC must be soldered on, along with two 10µF capacitors. See [this page](https://www.codrey.com/electronic-circuits/hack-your-16x2-lcd/) for more details.
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## Usage
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To initialize your display, call `lcd_init()` with one of these parameters:
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````
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LCD_DISP_OFF : display off
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LCD_DISP_ON : display on, cursor off
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LCD_DISP_ON_CURSOR : display on, cursor on
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LCD_DISP_ON_CURSOR_BLINK : display on, cursor on flashing
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````
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This is best done in your keyboards `matrix_init_kb` or your keymaps `matrix_init_user`.
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It is advised to clear the display before use.
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To do so call `lcd_clrscr()`.
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Add the following to your `rules.mk`:
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To now print something to your Display you first call `lcd_gotoxy(column, line)`. To go to the start of the first line you would call `lcd_gotoxy(0, 0)` and then print a string with `lcd_puts("example string")`.
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```make
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HD44780_ENABLE = yes
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```
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There are more methods available to control the display. [For in depth documentation please visit the linked page.](http://www.peterfleury.epizy.com/doxygen/avr-gcc-libraries/group__pfleury__lcd.html)
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## Basic Configuration
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Add the following to your `config.h`:
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|Define |Default |Description |
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|-----------------------|--------------|-----------------------------------------------------------------------------------------------------|
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|`HD44780_DATA_PINS` |*Not defined* |(Required) An array of four GPIO pins connected to the display's D4-D7 pins, eg. `{ B1, B3, B2, B6 }`|
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|`HD44780_RS_PIN` |*Not defined* |(Required) The GPIO connected to the display's RS pin |
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|`HD44780_RW_PIN` |*Not defined* |(Required) The GPIO connected to the display's RW pin |
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|`HD44780_E_PIN` |*Not defined* |(Required) The GPIO connected to the display's E pin |
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|`HD44780_DISPLAY_COLS` |`16` |The number of visible characters on a single line of the display |
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|`HD44780_DISPLAY_LINES`|`2` |The number of visible lines on the display |
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|`HD44780_WRAP_LINES` |*Not defined* |If defined, input characters will wrap to the next line |
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## Examples
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### Hello World
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Add the following to your `keymap.c`:
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```c
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void keyboard_post_init_user(void) {
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hd44780_init(true, true); // Show blinking cursor
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hd44780_puts_P(PSTR("Hello, world!\n"));
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}
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```
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### Custom Character Definition
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Up to eight custom characters can be defined. This data is stored in the Character Generator RAM (CGRAM), and is not persistent across power cycles.
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This example defines the QMK Psi as the first custom character. The first 16 positions in the character set are reserved for the eight custom characters duplicated.
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```
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Byte | 16 8 4 2 1
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1 | x x x ■ □ ■ □ ■
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2 | x x x ■ □ ■ □ ■
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3 | x x x ■ □ ■ □ ■
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4 | x x x □ ■ ■ ■ □
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5 | x x x □ □ ■ □ □
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6 | x x x □ □ ■ □ □
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7 | x x x □ □ ■ □ □
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8 | x x x □ □ □ □ □
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```
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```c
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const uint8_t PROGMEM psi[8] = { 0x15, 0x15, 0x15, 0x0E, 0x04, 0x04, 0x04, 0x00 };
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void keyboard_post_init_user(void) {
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hd44780_init(false, false);
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hd44780_define_char_P(0, psi);
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// Cursor is incremented while defining characters so must be reset
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hd44780_home();
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// 0x08 to avoid null terminator
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hd44780_puts_P(PSTR("\x08 QMK Firmware"));
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}
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```
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## API
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### `void hd44780_init(bool cursor, bool blink)`
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Initialize the display.
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This function should be called only once, before any of the other functions can be called.
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#### Arguments
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- `bool cursor`
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Whether to show the cursor.
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- `bool blink`
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Whether to blink the cursor, if shown.
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---
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### `void hd44780_clear(void)`
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Clear the display.
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This function is called on init.
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---
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### `void hd44780_home(void)`
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Move the cursor to the home position.
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This function is called on init.
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---
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### `void hd44780_on(bool cursor, bool blink)`
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Turn the display on, and/or set the cursor properties.
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This function is called on init.
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#### Arguments
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- `bool cursor`
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Whether to show the cursor.
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- `bool blink`
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Whether to blink the cursor, if shown.
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---
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### `void hd44780_off(void)`
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Turn the display off.
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---
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### `void hd44780_set_cursor(uint8_t col, uint8_t line)`
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Move the cursor to the specified position on the display.
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#### Arguments
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- `uint8_t col`
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The column number to move to, from 0 to 15 on 16x2 displays.
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- `bool line`
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The line number to move to, either 0 or 1 on 16x2 displays.
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---
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### `void hd44780_putc(char c)`
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Print a character to the display. The newline character `\n` will move the cursor to the start of the next line.
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The exact character shown may depend on the ROM code of your particular display - refer to the datasheet for the full character set.
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#### Arguments
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- `char c`
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The character to print.
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---
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### `void hd44780_puts(const char *s)`
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Print a string of characters to the display.
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#### Arguments
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- `const char *s`
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The string to print.
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---
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### `void hd44780_puts_P(const char *s)`
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Print a string of characters from PROGMEM to the display.
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On ARM devices, this function is simply an alias of `hd44780_puts()`.
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#### Arguments
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- `const char *s`
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The PROGMEM string to print (ie. `PSTR("Hello")`).
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---
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### `void hd44780_define_char(uint8_t index, uint8_t *data)`
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Define a custom character.
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#### Arguments
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- `uint8_t index`
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The index of the custom character to define, from 0 to 7.
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- `uint8_t *data`
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An array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column.
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---
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### `void hd44780_define_char_P(uint8_t index, const uint8_t *data)`
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Define a custom character from PROGMEM.
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On ARM devices, this function is simply an alias of `hd44780_define_char()`.
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#### Arguments
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- `uint8_t index`
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The index of the custom character to define, from 0 to 7.
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- `const uint8_t *data`
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A PROGMEM array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column.
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---
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### `bool hd44780_busy(void)`
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Indicates whether the display is currently processing, and cannot accept instructions.
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#### Return Value
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`true` if the display is busy.
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---
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### `void hd44780_write(uint8_t data, bool isData)`
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Write a byte to the display.
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#### Arguments
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- `uint8_t data`
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The byte to send to the display.
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- `bool isData`
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Whether the byte is an instruction or character data.
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---
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### `uint8_t hd44780_read(bool isData)`
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Read a byte from the display.
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#### Arguments
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- `bool isData`
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Whether to read the current cursor position, or the character at the cursor.
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#### Return Value
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If `isData` is `true`, the returned byte will be the character at the current DDRAM address. Otherwise, it will be the current DDRAM address and the busy flag.
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---
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### `void hd44780_command(uint8_t command)`
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Send a command to the display. Refer to the datasheet and `hd44780.h` for the valid commands and defines.
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This function waits for the display to clear the busy flag before sending the command.
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#### Arguments
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- `uint8_t command`
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The command to send.
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---
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### `void hd44780_data(uint8_t data)`
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Send a byte of data to the display.
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This function waits for the display to clear the busy flag before sending the data.
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#### Arguments
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- `uint8_t data`
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The byte of data to send.
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---
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### `void hd44780_set_cgram_address(uint8_t address)`
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Set the CGRAM address.
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This function is used when defining custom characters.
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#### Arguments
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- `uint8_t address`
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The CGRAM address to move to, from `0x00` to `0x3F`.
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---
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### `void hd44780_set_ddram_address(uint8_t address)`
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Set the DDRAM address.
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This function is used when printing characters to the display, and setting the cursor.
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#### Arguments
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- `uint8_t address`
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The DDRAM address to move to, from `0x00` to `0x7F`.
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284
drivers/lcd/hd44780.c
Normal file
284
drivers/lcd/hd44780.c
Normal file
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@ -0,0 +1,284 @@
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/*
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Copyright 2022
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hd44780.h"
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#include "gpio.h"
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#include "progmem.h"
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#include "wait.h"
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#ifndef HD44780_DATA_PINS
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# error hd44780: no data pins defined!
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#endif
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#ifndef HD44780_RS_PIN
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# error hd44780: no RS pin defined!
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#endif
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#ifndef HD44780_RW_PIN
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# error hd44780: no R/W pin defined!
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#endif
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#ifndef HD44780_E_PIN
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# error hd44780: no E pin defined!
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#endif
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static const pin_t data_pins[4] = HD44780_DATA_PINS;
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#ifndef HD44780_DISPLAY_COLS
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# define HD44780_DISPLAY_COLS 16
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#endif
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#ifndef HD44780_DISPLAY_LINES
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# define HD44780_DISPLAY_LINES 2
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#endif
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#ifndef HD44780_DDRAM_LINE0_ADDR
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# define HD44780_DDRAM_LINE0_ADDR 0x00
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#endif
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#ifndef HD44780_DDRAM_LINE1_ADDR
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# define HD44780_DDRAM_LINE1_ADDR 0x40
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#endif
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#define HD44780_INIT_DELAY_MS 16
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#define HD44780_ENABLE_DELAY_US 1
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static void hd44780_latch(void) {
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writePinHigh(HD44780_E_PIN);
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wait_us(HD44780_ENABLE_DELAY_US);
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writePinLow(HD44780_E_PIN);
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}
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void hd44780_write(uint8_t data, bool isData) {
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writePin(HD44780_RS_PIN, isData);
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writePinLow(HD44780_RW_PIN);
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for (int i = 0; i < 4; i++) {
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setPinOutput(data_pins[i]);
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}
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// Write high nibble
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for (int i = 0; i < 4; i++) {
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writePin(data_pins[i], (data >> 4) & (1 << i));
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}
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hd44780_latch();
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// Write low nibble
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for (int i = 0; i < 4; i++) {
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writePin(data_pins[i], data & (1 << i));
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}
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hd44780_latch();
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for (int i = 0; i < 4; i++) {
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writePinHigh(data_pins[i]);
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}
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}
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uint8_t hd44780_read(bool isData) {
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uint8_t data = 0;
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writePin(HD44780_RS_PIN, isData);
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writePinHigh(HD44780_RW_PIN);
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for (int i = 0; i < 4; i++) {
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setPinInput(data_pins[i]);
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}
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writePinHigh(HD44780_E_PIN);
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wait_us(HD44780_ENABLE_DELAY_US);
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// Read high nibble
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for (int i = 0; i < 4; i++) {
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data |= (readPin(data_pins[i]) << i);
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}
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data <<= 4;
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writePinLow(HD44780_E_PIN);
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wait_us(HD44780_ENABLE_DELAY_US);
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writePinHigh(HD44780_E_PIN);
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wait_us(HD44780_ENABLE_DELAY_US);
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// Read low nibble
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for (int i = 0; i < 4; i++) {
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data |= (readPin(data_pins[i]) << i);
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}
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writePinLow(HD44780_E_PIN);
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||||
|
||||
return data;
|
||||
}
|
||||
|
||||
bool hd44780_busy(void) {
|
||||
return hd44780_read(false) & HD44780_BUSY_FLAG;
|
||||
}
|
||||
|
||||
void hd44780_command(uint8_t command) {
|
||||
while (hd44780_busy())
|
||||
;
|
||||
hd44780_write(command, false);
|
||||
}
|
||||
|
||||
void hd44780_data(uint8_t data) {
|
||||
while (hd44780_busy())
|
||||
;
|
||||
hd44780_write(data, true);
|
||||
}
|
||||
|
||||
void hd44780_clear(void) {
|
||||
hd44780_command(HD44780_CMD_CLEAR_DISPLAY);
|
||||
}
|
||||
|
||||
void hd44780_home(void) {
|
||||
hd44780_command(HD44780_CMD_RETURN_HOME);
|
||||
}
|
||||
|
||||
void hd44780_on(bool cursor, bool blink) {
|
||||
if (cursor) {
|
||||
if (blink) {
|
||||
hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON | HD44780_DISPLAY_CURSOR | HD44780_DISPLAY_BLINK);
|
||||
} else {
|
||||
hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON | HD44780_DISPLAY_CURSOR);
|
||||
}
|
||||
} else {
|
||||
hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON);
|
||||
}
|
||||
}
|
||||
|
||||
void hd44780_off() {
|
||||
hd44780_command(HD44780_CMD_DISPLAY);
|
||||
}
|
||||
|
||||
void hd44780_set_cgram_address(uint8_t address) {
|
||||
hd44780_command(HD44780_CMD_SET_CGRAM_ADDRESS + (address & 0x3F));
|
||||
}
|
||||
|
||||
void hd44780_set_ddram_address(uint8_t address) {
|
||||
hd44780_command(HD44780_CMD_SET_DDRAM_ADDRESS + (address & 0x7F));
|
||||
}
|
||||
|
||||
void hd44780_init(bool cursor, bool blink) {
|
||||
setPinOutput(HD44780_RS_PIN);
|
||||
setPinOutput(HD44780_RW_PIN);
|
||||
setPinOutput(HD44780_E_PIN);
|
||||
|
||||
for (int i = 0; i < 4; i++) {
|
||||
setPinOutput(data_pins[i]);
|
||||
}
|
||||
|
||||
wait_ms(HD44780_INIT_DELAY_MS);
|
||||
|
||||
// Manually configure for 4-bit mode - can't use hd44780_command() yet
|
||||
// HD44780U datasheet, Fig. 24 (p46)
|
||||
writePinHigh(data_pins[0]); // Function set
|
||||
writePinHigh(data_pins[1]); // DL = 1
|
||||
hd44780_latch();
|
||||
wait_ms(5);
|
||||
// Send again
|
||||
hd44780_latch();
|
||||
wait_us(64);
|
||||
// And again (?)
|
||||
hd44780_latch();
|
||||
wait_us(64);
|
||||
|
||||
writePinLow(data_pins[0]); // DL = 0
|
||||
hd44780_latch();
|
||||
wait_us(64);
|
||||
|
||||
#if HD44780_DISPLAY_LINES == 1
|
||||
hd44780_command(HD44780_CMD_FUNCTION); // 4 bit, 1 line, 5x8 dots
|
||||
#else
|
||||
hd44780_command(HD44780_CMD_FUNCTION | HD44780_FUNCTION_2_LINES); // 4 bit, 2 lines, 5x8 dots
|
||||
#endif
|
||||
hd44780_on(cursor, blink);
|
||||
hd44780_clear();
|
||||
hd44780_home();
|
||||
hd44780_command(HD44780_CMD_ENTRY_MODE | HD44780_ENTRY_MODE_INC);
|
||||
}
|
||||
|
||||
void hd44780_set_cursor(uint8_t col, uint8_t line) {
|
||||
register uint8_t address = col;
|
||||
|
||||
#if HD44780_DISPLAY_LINES == 1
|
||||
address += HD44780_DDRAM_LINE0_ADDR;
|
||||
#elif HD44780_DISPLAY_LINES == 2
|
||||
if (line == 0) {
|
||||
address += HD44780_DDRAM_LINE0_ADDR;
|
||||
} else {
|
||||
address += HD44780_DDRAM_LINE1_ADDR;
|
||||
}
|
||||
#endif
|
||||
|
||||
hd44780_set_ddram_address(address);
|
||||
}
|
||||
|
||||
void hd44780_define_char(uint8_t index, uint8_t *data) {
|
||||
hd44780_set_cgram_address((index & 0x7) << 3);
|
||||
for (uint8_t i = 0; i < 8; i++) {
|
||||
hd44780_data(data[i]);
|
||||
}
|
||||
}
|
||||
|
||||
void hd44780_putc(char c) {
|
||||
while (hd44780_busy())
|
||||
;
|
||||
uint8_t current_position = hd44780_read(false);
|
||||
|
||||
if (c == '\n') {
|
||||
hd44780_set_cursor(0, current_position < HD44780_DDRAM_LINE1_ADDR ? 1 : 0);
|
||||
} else {
|
||||
#if defined(HD44780_WRAP_LINES)
|
||||
# if HD44780_DISPLAY_LINES == 1
|
||||
if (current_position == HD44780_DDRAM_LINE0_ADDR + HD44780_DISPLAY_COLS) {
|
||||
// Go to start of line
|
||||
hd44780_set_cursor(0, 0);
|
||||
}
|
||||
# elif HD44780_DISPLAY_LINES == 2
|
||||
if (current_position == HD44780_DDRAM_LINE0_ADDR + HD44780_DISPLAY_COLS) {
|
||||
// Go to start of second line
|
||||
hd44780_set_cursor(0, 1);
|
||||
} else if (current_position == HD44780_DDRAM_LINE1_ADDR + HD44780_DISPLAY_COLS) {
|
||||
// Go to start of first line
|
||||
hd44780_set_cursor(0, 0);
|
||||
}
|
||||
# endif
|
||||
#endif
|
||||
hd44780_data(c);
|
||||
}
|
||||
}
|
||||
|
||||
void hd44780_puts(const char *s) {
|
||||
register char c;
|
||||
while ((c = *s++)) {
|
||||
hd44780_putc(c);
|
||||
}
|
||||
}
|
||||
|
||||
#if defined(__AVR__)
|
||||
void hd44780_define_char_P(uint8_t index, const uint8_t *data) {
|
||||
hd44780_set_cgram_address(index << 3);
|
||||
for (uint8_t i = 0; i < 8; i++) {
|
||||
hd44780_data(pgm_read_byte(data++));
|
||||
}
|
||||
}
|
||||
|
||||
void hd44780_puts_P(const char *s) {
|
||||
register char c;
|
||||
while ((c = pgm_read_byte(s++))) {
|
||||
hd44780_putc(c);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
220
drivers/lcd/hd44780.h
Normal file
220
drivers/lcd/hd44780.h
Normal file
|
|
@ -0,0 +1,220 @@
|
|||
/*
|
||||
Copyright 2022
|
||||
|
||||
This program is free software: you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation, either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
/**
|
||||
* \defgroup hd44780
|
||||
*
|
||||
* HD44780 Character LCD Driver
|
||||
* \{
|
||||
*/
|
||||
|
||||
/*
|
||||
* HD44780 instructions
|
||||
* https://www.sparkfun.com/datasheets/LCD/HD44780.pdf
|
||||
* Table 6 (p24)
|
||||
*/
|
||||
// Clear display
|
||||
#define HD44780_CMD_CLEAR_DISPLAY 0x01
|
||||
// Return home
|
||||
#define HD44780_CMD_RETURN_HOME 0x02
|
||||
// Entry mode set
|
||||
#define HD44780_CMD_ENTRY_MODE 0x04
|
||||
#define HD44780_ENTRY_MODE_INC 0x02 // I/D
|
||||
#define HD44780_ENTRY_MODE_SHIFT 0x01 // S
|
||||
// Display on/off control
|
||||
#define HD44780_CMD_DISPLAY 0x08
|
||||
#define HD44780_DISPLAY_ON 0x04 // D
|
||||
#define HD44780_DISPLAY_CURSOR 0x02 // C
|
||||
#define HD44780_DISPLAY_BLINK 0x01 // B
|
||||
// Cursor or display shift
|
||||
#define HD44780_CMD_MOVE 0x10
|
||||
#define HD44780_MOVE_DISPLAY 0x08 // S/C
|
||||
#define HD44780_MOVE_RIGHT 0x04 // R/L
|
||||
// Function set
|
||||
#define HD44780_CMD_FUNCTION 0x20
|
||||
#define HD44780_FUNCTION_8_BIT 0x10 // DL
|
||||
#define HD44780_FUNCTION_2_LINES 0x08 // N
|
||||
#define HD44780_FUNCTION_5X10_DOTS 0x04 // F
|
||||
// Set CGRAM address
|
||||
#define HD44780_CMD_SET_CGRAM_ADDRESS 0x40
|
||||
// Set DDRAM address
|
||||
#define HD44780_CMD_SET_DDRAM_ADDRESS 0x80
|
||||
|
||||
// Bitmask for busy flag when reading
|
||||
#define HD44780_BUSY_FLAG 0x80
|
||||
|
||||
/**
|
||||
* \brief Write a byte to the display.
|
||||
*
|
||||
* \param data The byte to send to the display.
|
||||
* \param isData Whether the byte is an instruction or character data.
|
||||
*/
|
||||
void hd44780_write(uint8_t data, bool isData);
|
||||
|
||||
/**
|
||||
* \brief Read a byte from the display.
|
||||
*
|
||||
* \param isData Whether to read the current cursor position, or the character at the cursor.
|
||||
*
|
||||
* \return If `isData` is `true`, the returned byte will be the character at the current DDRAM address. Otherwise, it will be the current DDRAM address and the busy flag.
|
||||
*/
|
||||
uint8_t hd44780_read(bool isData);
|
||||
|
||||
/**
|
||||
* \brief Indicates whether the display is currently processing, and cannot accept instructions.
|
||||
*
|
||||
* \return `true` if the display is busy.
|
||||
*/
|
||||
bool hd44780_busy(void);
|
||||
|
||||
/**
|
||||
* \brief Send a command to the display. Refer to the datasheet for the valid commands.
|
||||
*
|
||||
* This function waits for the display to clear the busy flag before sending the command.
|
||||
*
|
||||
* \param command The command to send.
|
||||
*/
|
||||
void hd44780_command(uint8_t command);
|
||||
|
||||
/**
|
||||
* \brief Send a byte of data to the display.
|
||||
*
|
||||
* This function waits for the display to clear the busy flag before sending the data.
|
||||
*
|
||||
* \param data The byte of data to send.
|
||||
*/
|
||||
void hd44780_data(uint8_t data);
|
||||
|
||||
/**
|
||||
* \brief Clear the display.
|
||||
*
|
||||
* This function is called on init.
|
||||
*/
|
||||
void hd44780_clear(void);
|
||||
|
||||
/**
|
||||
* \brief Move the cursor to the home position.
|
||||
*
|
||||
* This function is called on init.
|
||||
*/
|
||||
void hd44780_home(void);
|
||||
|
||||
/**
|
||||
* \brief Turn the display on, and/or set the cursor position.
|
||||
*
|
||||
* This function is called on init.
|
||||
*
|
||||
* \param cursor Whether to show the cursor.
|
||||
* \param blink Whether to blink the cursor, if shown.
|
||||
*/
|
||||
void hd44780_on(bool cursor, bool blink);
|
||||
|
||||
/**
|
||||
* \brief Turn the display off.
|
||||
*/
|
||||
void hd44780_off(void);
|
||||
|
||||
/**
|
||||
* \brief Set the CGRAM address.
|
||||
*
|
||||
* This function is used when defining custom characters.
|
||||
*
|
||||
* \param address The CGRAM address to move to, from `0x00` to `0x3F`.
|
||||
*/
|
||||
void hd44780_set_cgram_address(uint8_t address);
|
||||
|
||||
/**
|
||||
* \brief Set the DDRAM address.
|
||||
*
|
||||
* This function is used when printing characters to the display, and setting the cursor.
|
||||
*
|
||||
* \param address The DDRAM address to move to, from `0x00` to `0x7F`.
|
||||
*/
|
||||
void hd44780_set_ddram_address(uint8_t address);
|
||||
|
||||
/**
|
||||
* \brief Initialize the display.
|
||||
*
|
||||
* This function should be called only once, before any of the other functions can be called.
|
||||
*
|
||||
* \param cursor Whether to show the cursor.
|
||||
* \param blink Whether to blink the cursor, if shown.
|
||||
*/
|
||||
void hd44780_init(bool cursor, bool blink);
|
||||
|
||||
/**
|
||||
* \brief Move the cursor to the specified position on the display.
|
||||
*
|
||||
* \param col The column number to move to, from 0 to 15 on 16x2 displays.
|
||||
* \param line The line number to move to, either 0 or 1 on 16x2 displays.
|
||||
*/
|
||||
void hd44780_set_cursor(uint8_t col, uint8_t line);
|
||||
|
||||
/**
|
||||
* \brief Define a custom character.
|
||||
*
|
||||
* \param index The index of the custom character to define, from 0 to 7.
|
||||
* \param data An array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column.
|
||||
*/
|
||||
void hd44780_define_char(uint8_t index, uint8_t *data);
|
||||
|
||||
/**
|
||||
* \brief Print a character to the display. The newline character will move the cursor to the start of the next line.
|
||||
*
|
||||
* The exact character shown may depend on the ROM code of your particular display - refer to the datasheet for the full character set.
|
||||
*
|
||||
* \param c The character to print.
|
||||
*/
|
||||
void hd44780_putc(char c);
|
||||
|
||||
/**
|
||||
* \brief Print a string of characters to the display.
|
||||
*
|
||||
* \param s The string to print.
|
||||
*/
|
||||
void hd44780_puts(const char *s);
|
||||
|
||||
#if defined(__AVR__) || defined(__DOXYGEN__)
|
||||
/**
|
||||
* \brief Define a custom character from PROGMEM.
|
||||
*
|
||||
* On ARM devices, this function is simply an alias of hd44780_define_char().
|
||||
*
|
||||
* \param index The index of the custom character to define, from 0 to 7.
|
||||
* \param data A PROGMEM array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column.
|
||||
*/
|
||||
void hd44780_define_char_P(uint8_t index, const uint8_t *data);
|
||||
|
||||
/**
|
||||
* \brief Print a string of characters from PROGMEM to the display.
|
||||
*
|
||||
* On ARM devices, this function is simply an alias of hd44780_puts().
|
||||
*
|
||||
* \param s The PROGMEM string to print.
|
||||
*/
|
||||
void hd44780_puts_P(const char *s);
|
||||
#else
|
||||
# define hd44780_define_char_P(index, data) hd44780_define_char(index, data)
|
||||
# define hd44780_puts_P(s) hd44780_puts(s)
|
||||
#endif
|
||||
|
||||
/** \} */
|
||||
|
|
@ -1,542 +0,0 @@
|
|||
/****************************************************************************
|
||||
Title: HD44780U LCD library
|
||||
Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
|
||||
License: GNU General Public License Version 3
|
||||
File: $Id: lcd.c,v 1.15.2.2 2015/01/17 12:16:05 peter Exp $
|
||||
Software: AVR-GCC 3.3
|
||||
Target: any AVR device, memory mapped mode only for AT90S4414/8515/Mega
|
||||
|
||||
DESCRIPTION
|
||||
Basic routines for interfacing a HD44780U-based text lcd display
|
||||
|
||||
Originally based on Volker Oth's lcd library,
|
||||
changed lcd_init(), added additional constants for lcd_command(),
|
||||
added 4-bit I/O mode, improved and optimized code.
|
||||
|
||||
Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in
|
||||
4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported.
|
||||
|
||||
Memory mapped mode compatible with Kanda STK200, but supports also
|
||||
generation of R/W signal through A8 address line.
|
||||
|
||||
USAGE
|
||||
See the C include lcd.h file for a description of each function
|
||||
|
||||
*****************************************************************************/
|
||||
#include <inttypes.h>
|
||||
#include <avr/io.h>
|
||||
#include <avr/pgmspace.h>
|
||||
#include <util/delay.h>
|
||||
#include "hd44780.h"
|
||||
|
||||
/*
|
||||
** constants/macros
|
||||
*/
|
||||
#define DDR(x) (*(&x - 1)) /* address of data direction register of port x */
|
||||
#if defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__)
|
||||
/* on ATmega64/128 PINF is on port 0x00 and not 0x60 */
|
||||
# define PIN(x) (&PORTF == &(x) ? _SFR_IO8(0x00) : (*(&x - 2)))
|
||||
#else
|
||||
# define PIN(x) (*(&x - 2)) /* address of input register of port x */
|
||||
#endif
|
||||
|
||||
#if LCD_IO_MODE
|
||||
# define lcd_e_delay() _delay_us(LCD_DELAY_ENABLE_PULSE)
|
||||
# define lcd_e_high() LCD_E_PORT |= _BV(LCD_E_PIN);
|
||||
# define lcd_e_low() LCD_E_PORT &= ~_BV(LCD_E_PIN);
|
||||
# define lcd_e_toggle() toggle_e()
|
||||
# define lcd_rw_high() LCD_RW_PORT |= _BV(LCD_RW_PIN)
|
||||
# define lcd_rw_low() LCD_RW_PORT &= ~_BV(LCD_RW_PIN)
|
||||
# define lcd_rs_high() LCD_RS_PORT |= _BV(LCD_RS_PIN)
|
||||
# define lcd_rs_low() LCD_RS_PORT &= ~_BV(LCD_RS_PIN)
|
||||
#endif
|
||||
|
||||
#if LCD_IO_MODE
|
||||
# if LCD_LINES == 1
|
||||
# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_1LINE
|
||||
# else
|
||||
# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_2LINES
|
||||
# endif
|
||||
#else
|
||||
# if LCD_LINES == 1
|
||||
# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_1LINE
|
||||
# else
|
||||
# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_2LINES
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#if LCD_CONTROLLER_KS0073
|
||||
# if LCD_LINES == 4
|
||||
|
||||
# define KS0073_EXTENDED_FUNCTION_REGISTER_ON 0x2C /* |0|010|1100 4-bit mode, extension-bit RE = 1 */
|
||||
# define KS0073_EXTENDED_FUNCTION_REGISTER_OFF 0x28 /* |0|010|1000 4-bit mode, extension-bit RE = 0 */
|
||||
# define KS0073_4LINES_MODE 0x09 /* |0|000|1001 4 lines mode */
|
||||
|
||||
# endif
|
||||
#endif
|
||||
|
||||
/*
|
||||
** function prototypes
|
||||
*/
|
||||
#if LCD_IO_MODE
|
||||
static void toggle_e(void);
|
||||
#endif
|
||||
|
||||
/*
|
||||
** local functions
|
||||
*/
|
||||
|
||||
/*************************************************************************
|
||||
delay for a minimum of <us> microseconds
|
||||
the number of loops is calculated at compile-time from MCU clock frequency
|
||||
*************************************************************************/
|
||||
#define delay(us) _delay_us(us)
|
||||
|
||||
#if LCD_IO_MODE
|
||||
/* toggle Enable Pin to initiate write */
|
||||
static void toggle_e(void) {
|
||||
lcd_e_high();
|
||||
lcd_e_delay();
|
||||
lcd_e_low();
|
||||
}
|
||||
#endif
|
||||
|
||||
/*************************************************************************
|
||||
Low-level function to write byte to LCD controller
|
||||
Input: data byte to write to LCD
|
||||
rs 1: write data
|
||||
0: write instruction
|
||||
Returns: none
|
||||
*************************************************************************/
|
||||
#if LCD_IO_MODE
|
||||
static void lcd_write(uint8_t data, uint8_t rs) {
|
||||
unsigned char dataBits;
|
||||
|
||||
if (rs) { /* write data (RS=1, RW=0) */
|
||||
lcd_rs_high();
|
||||
} else { /* write instruction (RS=0, RW=0) */
|
||||
lcd_rs_low();
|
||||
}
|
||||
lcd_rw_low(); /* RW=0 write mode */
|
||||
|
||||
if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
|
||||
/* configure data pins as output */
|
||||
DDR(LCD_DATA0_PORT) |= 0x0F;
|
||||
|
||||
/* output high nibble first */
|
||||
dataBits = LCD_DATA0_PORT & 0xF0;
|
||||
LCD_DATA0_PORT = dataBits | ((data >> 4) & 0x0F);
|
||||
lcd_e_toggle();
|
||||
|
||||
/* output low nibble */
|
||||
LCD_DATA0_PORT = dataBits | (data & 0x0F);
|
||||
lcd_e_toggle();
|
||||
|
||||
/* all data pins high (inactive) */
|
||||
LCD_DATA0_PORT = dataBits | 0x0F;
|
||||
} else {
|
||||
/* configure data pins as output */
|
||||
DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
|
||||
DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
|
||||
DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
|
||||
DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
|
||||
|
||||
/* output high nibble first */
|
||||
LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
|
||||
LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
|
||||
LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
|
||||
LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
|
||||
if (data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
|
||||
if (data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
|
||||
if (data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
|
||||
if (data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
|
||||
lcd_e_toggle();
|
||||
|
||||
/* output low nibble */
|
||||
LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
|
||||
LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
|
||||
LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
|
||||
LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
|
||||
if (data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
|
||||
if (data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
|
||||
if (data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
|
||||
if (data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
|
||||
lcd_e_toggle();
|
||||
|
||||
/* all data pins high (inactive) */
|
||||
LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
|
||||
LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
|
||||
LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
|
||||
LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
|
||||
}
|
||||
}
|
||||
#else
|
||||
# define lcd_write(d, rs) \
|
||||
if (rs) \
|
||||
*(volatile uint8_t *)(LCD_IO_DATA) = d; \
|
||||
else \
|
||||
*(volatile uint8_t *)(LCD_IO_FUNCTION) = d;
|
||||
/* rs==0 -> write instruction to LCD_IO_FUNCTION */
|
||||
/* rs==1 -> write data to LCD_IO_DATA */
|
||||
#endif
|
||||
|
||||
/*************************************************************************
|
||||
Low-level function to read byte from LCD controller
|
||||
Input: rs 1: read data
|
||||
0: read busy flag / address counter
|
||||
Returns: byte read from LCD controller
|
||||
*************************************************************************/
|
||||
#if LCD_IO_MODE
|
||||
static uint8_t lcd_read(uint8_t rs) {
|
||||
uint8_t data;
|
||||
|
||||
if (rs)
|
||||
lcd_rs_high(); /* RS=1: read data */
|
||||
else
|
||||
lcd_rs_low(); /* RS=0: read busy flag */
|
||||
lcd_rw_high(); /* RW=1 read mode */
|
||||
|
||||
if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
|
||||
DDR(LCD_DATA0_PORT) &= 0xF0; /* configure data pins as input */
|
||||
|
||||
lcd_e_high();
|
||||
lcd_e_delay();
|
||||
data = PIN(LCD_DATA0_PORT) << 4; /* read high nibble first */
|
||||
lcd_e_low();
|
||||
|
||||
lcd_e_delay(); /* Enable 500ns low */
|
||||
|
||||
lcd_e_high();
|
||||
lcd_e_delay();
|
||||
data |= PIN(LCD_DATA0_PORT) & 0x0F; /* read low nibble */
|
||||
lcd_e_low();
|
||||
} else {
|
||||
/* configure data pins as input */
|
||||
DDR(LCD_DATA0_PORT) &= ~_BV(LCD_DATA0_PIN);
|
||||
DDR(LCD_DATA1_PORT) &= ~_BV(LCD_DATA1_PIN);
|
||||
DDR(LCD_DATA2_PORT) &= ~_BV(LCD_DATA2_PIN);
|
||||
DDR(LCD_DATA3_PORT) &= ~_BV(LCD_DATA3_PIN);
|
||||
|
||||
/* read high nibble first */
|
||||
lcd_e_high();
|
||||
lcd_e_delay();
|
||||
data = 0;
|
||||
if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x10;
|
||||
if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x20;
|
||||
if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x40;
|
||||
if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x80;
|
||||
lcd_e_low();
|
||||
|
||||
lcd_e_delay(); /* Enable 500ns low */
|
||||
|
||||
/* read low nibble */
|
||||
lcd_e_high();
|
||||
lcd_e_delay();
|
||||
if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x01;
|
||||
if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x02;
|
||||
if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x04;
|
||||
if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x08;
|
||||
lcd_e_low();
|
||||
}
|
||||
return data;
|
||||
}
|
||||
#else
|
||||
# define lcd_read(rs) (rs) ? *(volatile uint8_t *)(LCD_IO_DATA + LCD_IO_READ) : *(volatile uint8_t *)(LCD_IO_FUNCTION + LCD_IO_READ)
|
||||
/* rs==0 -> read instruction from LCD_IO_FUNCTION */
|
||||
/* rs==1 -> read data from LCD_IO_DATA */
|
||||
#endif
|
||||
|
||||
/*************************************************************************
|
||||
loops while lcd is busy, returns address counter
|
||||
*************************************************************************/
|
||||
static uint8_t lcd_waitbusy(void)
|
||||
|
||||
{
|
||||
register uint8_t c;
|
||||
|
||||
/* wait until busy flag is cleared */
|
||||
while ((c = lcd_read(0)) & (1 << LCD_BUSY)) {
|
||||
}
|
||||
|
||||
/* the address counter is updated 4us after the busy flag is cleared */
|
||||
delay(LCD_DELAY_BUSY_FLAG);
|
||||
|
||||
/* now read the address counter */
|
||||
return (lcd_read(0)); // return address counter
|
||||
|
||||
} /* lcd_waitbusy */
|
||||
|
||||
/*************************************************************************
|
||||
Move cursor to the start of next line or to the first line if the cursor
|
||||
is already on the last line.
|
||||
*************************************************************************/
|
||||
static inline void lcd_newline(uint8_t pos) {
|
||||
register uint8_t addressCounter;
|
||||
|
||||
#if LCD_LINES == 1
|
||||
addressCounter = 0;
|
||||
#endif
|
||||
#if LCD_LINES == 2
|
||||
if (pos < (LCD_START_LINE2))
|
||||
addressCounter = LCD_START_LINE2;
|
||||
else
|
||||
addressCounter = LCD_START_LINE1;
|
||||
#endif
|
||||
#if LCD_LINES == 4
|
||||
# if KS0073_4LINES_MODE
|
||||
if (pos < LCD_START_LINE2)
|
||||
addressCounter = LCD_START_LINE2;
|
||||
else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE3))
|
||||
addressCounter = LCD_START_LINE3;
|
||||
else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE4))
|
||||
addressCounter = LCD_START_LINE4;
|
||||
else
|
||||
addressCounter = LCD_START_LINE1;
|
||||
# else
|
||||
if (pos < LCD_START_LINE3)
|
||||
addressCounter = LCD_START_LINE2;
|
||||
else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4))
|
||||
addressCounter = LCD_START_LINE3;
|
||||
else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2))
|
||||
addressCounter = LCD_START_LINE4;
|
||||
else
|
||||
addressCounter = LCD_START_LINE1;
|
||||
# endif
|
||||
#endif
|
||||
lcd_command((1 << LCD_DDRAM) + addressCounter);
|
||||
|
||||
} /* lcd_newline */
|
||||
|
||||
/*
|
||||
** PUBLIC FUNCTIONS
|
||||
*/
|
||||
|
||||
/*************************************************************************
|
||||
Send LCD controller instruction command
|
||||
Input: instruction to send to LCD controller, see HD44780 data sheet
|
||||
Returns: none
|
||||
*************************************************************************/
|
||||
void lcd_command(uint8_t cmd) {
|
||||
lcd_waitbusy();
|
||||
lcd_write(cmd, 0);
|
||||
}
|
||||
|
||||
/*************************************************************************
|
||||
Send data byte to LCD controller
|
||||
Input: data to send to LCD controller, see HD44780 data sheet
|
||||
Returns: none
|
||||
*************************************************************************/
|
||||
void lcd_data(uint8_t data) {
|
||||
lcd_waitbusy();
|
||||
lcd_write(data, 1);
|
||||
}
|
||||
|
||||
/*************************************************************************
|
||||
Set cursor to specified position
|
||||
Input: x horizontal position (0: left most position)
|
||||
y vertical position (0: first line)
|
||||
Returns: none
|
||||
*************************************************************************/
|
||||
void lcd_gotoxy(uint8_t x, uint8_t y) {
|
||||
#if LCD_LINES == 1
|
||||
lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
|
||||
#endif
|
||||
#if LCD_LINES == 2
|
||||
if (y == 0)
|
||||
lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
|
||||
else
|
||||
lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x);
|
||||
#endif
|
||||
#if LCD_LINES == 4
|
||||
if (y == 0)
|
||||
lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
|
||||
else if (y == 1)
|
||||
lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x);
|
||||
else if (y == 2)
|
||||
lcd_command((1 << LCD_DDRAM) + LCD_START_LINE3 + x);
|
||||
else /* y==3 */
|
||||
lcd_command((1 << LCD_DDRAM) + LCD_START_LINE4 + x);
|
||||
#endif
|
||||
|
||||
} /* lcd_gotoxy */
|
||||
|
||||
/*************************************************************************
|
||||
*************************************************************************/
|
||||
int lcd_getxy(void) {
|
||||
return lcd_waitbusy();
|
||||
}
|
||||
|
||||
/*************************************************************************
|
||||
Clear display and set cursor to home position
|
||||
*************************************************************************/
|
||||
void lcd_clrscr(void) {
|
||||
lcd_command(1 << LCD_CLR);
|
||||
}
|
||||
|
||||
/*************************************************************************
|
||||
Set cursor to home position
|
||||
*************************************************************************/
|
||||
void lcd_home(void) {
|
||||
lcd_command(1 << LCD_HOME);
|
||||
}
|
||||
|
||||
/*************************************************************************
|
||||
Display character at current cursor position
|
||||
Input: character to be displayed
|
||||
Returns: none
|
||||
*************************************************************************/
|
||||
void lcd_putc(char c) {
|
||||
uint8_t pos;
|
||||
|
||||
pos = lcd_waitbusy(); // read busy-flag and address counter
|
||||
if (c == '\n') {
|
||||
lcd_newline(pos);
|
||||
} else {
|
||||
#if LCD_WRAP_LINES == 1
|
||||
# if LCD_LINES == 1
|
||||
if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
|
||||
lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
|
||||
}
|
||||
# elif LCD_LINES == 2
|
||||
if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
|
||||
lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0);
|
||||
} else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) {
|
||||
lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
|
||||
}
|
||||
# elif LCD_LINES == 4
|
||||
if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
|
||||
lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0);
|
||||
} else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) {
|
||||
lcd_write((1 << LCD_DDRAM) + LCD_START_LINE3, 0);
|
||||
} else if (pos == LCD_START_LINE3 + LCD_DISP_LENGTH) {
|
||||
lcd_write((1 << LCD_DDRAM) + LCD_START_LINE4, 0);
|
||||
} else if (pos == LCD_START_LINE4 + LCD_DISP_LENGTH) {
|
||||
lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
|
||||
}
|
||||
# endif
|
||||
lcd_waitbusy();
|
||||
#endif
|
||||
lcd_write(c, 1);
|
||||
}
|
||||
|
||||
} /* lcd_putc */
|
||||
|
||||
/*************************************************************************
|
||||
Display string without auto linefeed
|
||||
Input: string to be displayed
|
||||
Returns: none
|
||||
*************************************************************************/
|
||||
void lcd_puts(const char *s)
|
||||
/* print string on lcd (no auto linefeed) */
|
||||
{
|
||||
register char c;
|
||||
|
||||
while ((c = *s++)) {
|
||||
lcd_putc(c);
|
||||
}
|
||||
|
||||
} /* lcd_puts */
|
||||
|
||||
/*************************************************************************
|
||||
Display string from program memory without auto linefeed
|
||||
Input: string from program memory be be displayed
|
||||
Returns: none
|
||||
*************************************************************************/
|
||||
void lcd_puts_p(const char *progmem_s)
|
||||
/* print string from program memory on lcd (no auto linefeed) */
|
||||
{
|
||||
register char c;
|
||||
|
||||
while ((c = pgm_read_byte(progmem_s++))) {
|
||||
lcd_putc(c);
|
||||
}
|
||||
|
||||
} /* lcd_puts_p */
|
||||
|
||||
/*************************************************************************
|
||||
Initialize display and select type of cursor
|
||||
Input: dispAttr LCD_DISP_OFF display off
|
||||
LCD_DISP_ON display on, cursor off
|
||||
LCD_DISP_ON_CURSOR display on, cursor on
|
||||
LCD_DISP_CURSOR_BLINK display on, cursor on flashing
|
||||
Returns: none
|
||||
*************************************************************************/
|
||||
void lcd_init(uint8_t dispAttr) {
|
||||
#if LCD_IO_MODE
|
||||
/*
|
||||
* Initialize LCD to 4 bit I/O mode
|
||||
*/
|
||||
|
||||
if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (&LCD_RS_PORT == &LCD_DATA0_PORT) && (&LCD_RW_PORT == &LCD_DATA0_PORT) && (&LCD_E_PORT == &LCD_DATA0_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) && (LCD_RS_PIN == 4) && (LCD_RW_PIN == 5) && (LCD_E_PIN == 6)) {
|
||||
/* configure all port bits as output (all LCD lines on same port) */
|
||||
DDR(LCD_DATA0_PORT) |= 0x7F;
|
||||
} else if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
|
||||
/* configure all port bits as output (all LCD data lines on same port, but control lines on different ports) */
|
||||
DDR(LCD_DATA0_PORT) |= 0x0F;
|
||||
DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
|
||||
DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
|
||||
DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
|
||||
} else {
|
||||
/* configure all port bits as output (LCD data and control lines on different ports */
|
||||
DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
|
||||
DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
|
||||
DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
|
||||
DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
|
||||
DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
|
||||
DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
|
||||
DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
|
||||
}
|
||||
delay(LCD_DELAY_BOOTUP); /* wait 16ms or more after power-on */
|
||||
|
||||
/* initial write to lcd is 8bit */
|
||||
LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); // LCD_FUNCTION>>4;
|
||||
LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); // LCD_FUNCTION_8BIT>>4;
|
||||
lcd_e_toggle();
|
||||
delay(LCD_DELAY_INIT); /* delay, busy flag can't be checked here */
|
||||
|
||||
/* repeat last command */
|
||||
lcd_e_toggle();
|
||||
delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */
|
||||
|
||||
/* repeat last command a third time */
|
||||
lcd_e_toggle();
|
||||
delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */
|
||||
|
||||
/* now configure for 4bit mode */
|
||||
LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); // LCD_FUNCTION_4BIT_1LINE>>4
|
||||
lcd_e_toggle();
|
||||
delay(LCD_DELAY_INIT_4BIT); /* some displays need this additional delay */
|
||||
|
||||
/* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */
|
||||
#else
|
||||
/*
|
||||
* Initialize LCD to 8 bit memory mapped mode
|
||||
*/
|
||||
|
||||
/* enable external SRAM (memory mapped lcd) and one wait state */
|
||||
MCUCR = _BV(SRE) | _BV(SRW);
|
||||
|
||||
/* reset LCD */
|
||||
delay(LCD_DELAY_BOOTUP); /* wait 16ms after power-on */
|
||||
lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
|
||||
delay(LCD_DELAY_INIT); /* wait 5ms */
|
||||
lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
|
||||
delay(LCD_DELAY_INIT_REP); /* wait 64us */
|
||||
lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
|
||||
delay(LCD_DELAY_INIT_REP); /* wait 64us */
|
||||
#endif
|
||||
|
||||
#if KS0073_4LINES_MODE
|
||||
/* Display with KS0073 controller requires special commands for enabling 4 line mode */
|
||||
lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_ON);
|
||||
lcd_command(KS0073_4LINES_MODE);
|
||||
lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_OFF);
|
||||
#else
|
||||
lcd_command(LCD_FUNCTION_DEFAULT); /* function set: display lines */
|
||||
#endif
|
||||
lcd_command(LCD_DISP_OFF); /* display off */
|
||||
lcd_clrscr(); /* display clear */
|
||||
lcd_command(LCD_MODE_DEFAULT); /* set entry mode */
|
||||
lcd_command(dispAttr); /* display/cursor control */
|
||||
|
||||
} /* lcd_init */
|
||||
|
|
@ -1,348 +0,0 @@
|
|||
/*************************************************************************
|
||||
Title : C include file for the HD44780U LCD library (lcd.c)
|
||||
Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
|
||||
License: GNU General Public License Version 3
|
||||
File: $Id: lcd.h,v 1.14.2.4 2015/01/20 17:16:07 peter Exp $
|
||||
Software: AVR-GCC 4.x
|
||||
Hardware: any AVR device, memory mapped mode only for AVR with
|
||||
memory mapped interface (AT90S8515/ATmega8515/ATmega128)
|
||||
***************************************************************************/
|
||||
|
||||
/**
|
||||
@mainpage
|
||||
Collection of libraries for AVR-GCC
|
||||
@author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
|
||||
@copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
|
||||
|
||||
@file
|
||||
@defgroup pfleury_lcd LCD library <lcd.h>
|
||||
@code #include <lcd.h> @endcode
|
||||
|
||||
@brief Basic routines for interfacing a HD44780U-based character LCD display
|
||||
|
||||
LCD character displays can be found in many devices, like espresso machines, laser printers.
|
||||
The Hitachi HD44780 controller and its compatible controllers like Samsung KS0066U have become an industry standard for these types of displays.
|
||||
|
||||
This library allows easy interfacing with a HD44780 compatible display and can be
|
||||
operated in memory mapped mode (LCD_IO_MODE defined as 0 in the include file lcd.h.) or in
|
||||
4-bit IO port mode (LCD_IO_MODE defined as 1). 8-bit IO port mode is not supported.
|
||||
|
||||
Memory mapped mode is compatible with old Kanda STK200 starter kit, but also supports
|
||||
generation of R/W signal through A8 address line.
|
||||
|
||||
@see The chapter <a href=" http://homepage.hispeed.ch/peterfleury/avr-lcd44780.html" target="_blank">Interfacing a HD44780 Based LCD to an AVR</a>
|
||||
on my home page, which shows example circuits how to connect an LCD to an AVR controller.
|
||||
|
||||
@author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
|
||||
|
||||
@version 2.0
|
||||
|
||||
@copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
|
||||
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <inttypes.h>
|
||||
#include <avr/pgmspace.h>
|
||||
|
||||
#if (__GNUC__ * 100 + __GNUC_MINOR__) < 405
|
||||
# error "This library requires AVR-GCC 4.5 or later, update to newer AVR-GCC compiler !"
|
||||
#endif
|
||||
|
||||
/**@{*/
|
||||
|
||||
/*
|
||||
* LCD and target specific definitions below can be defined in a separate include file with name lcd_definitions.h instead modifying this file
|
||||
* by adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile
|
||||
* All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
|
||||
*/
|
||||
#ifdef _LCD_DEFINITIONS_FILE
|
||||
# include "lcd_definitions.h"
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @name Definition for LCD controller type
|
||||
* Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller.
|
||||
*/
|
||||
#ifndef LCD_CONTROLLER_KS0073
|
||||
# define LCD_CONTROLLER_KS0073 0 /**< Use 0 for HD44780 controller, 1 for KS0073 controller */
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @name Definitions for Display Size
|
||||
* Change these definitions to adapt setting to your display
|
||||
*
|
||||
* These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
|
||||
* adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile.
|
||||
* All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
|
||||
*
|
||||
*/
|
||||
#ifndef LCD_LINES
|
||||
# define LCD_LINES 2 /**< number of visible lines of the display */
|
||||
#endif
|
||||
#ifndef LCD_DISP_LENGTH
|
||||
# define LCD_DISP_LENGTH 16 /**< visibles characters per line of the display */
|
||||
#endif
|
||||
#ifndef LCD_LINE_LENGTH
|
||||
# define LCD_LINE_LENGTH 0x40 /**< internal line length of the display */
|
||||
#endif
|
||||
#ifndef LCD_START_LINE1
|
||||
# define LCD_START_LINE1 0x00 /**< DDRAM address of first char of line 1 */
|
||||
#endif
|
||||
#ifndef LCD_START_LINE2
|
||||
# define LCD_START_LINE2 0x40 /**< DDRAM address of first char of line 2 */
|
||||
#endif
|
||||
#ifndef LCD_START_LINE3
|
||||
# define LCD_START_LINE3 0x14 /**< DDRAM address of first char of line 3 */
|
||||
#endif
|
||||
#ifndef LCD_START_LINE4
|
||||
# define LCD_START_LINE4 0x54 /**< DDRAM address of first char of line 4 */
|
||||
#endif
|
||||
#ifndef LCD_WRAP_LINES
|
||||
# define LCD_WRAP_LINES 0 /**< 0: no wrap, 1: wrap at end of visibile line */
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @name Definitions for 4-bit IO mode
|
||||
*
|
||||
* The four LCD data lines and the three control lines RS, RW, E can be on the
|
||||
* same port or on different ports.
|
||||
* Change LCD_RS_PORT, LCD_RW_PORT, LCD_E_PORT if you want the control lines on
|
||||
* different ports.
|
||||
*
|
||||
* Normally the four data lines should be mapped to bit 0..3 on one port, but it
|
||||
* is possible to connect these data lines in different order or even on different
|
||||
* ports by adapting the LCD_DATAx_PORT and LCD_DATAx_PIN definitions.
|
||||
*
|
||||
* Adjust these definitions to your target.\n
|
||||
* These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
|
||||
* adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile.
|
||||
* All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
|
||||
*
|
||||
*/
|
||||
#define LCD_IO_MODE 1 /**< 0: memory mapped mode, 1: IO port mode */
|
||||
|
||||
#if LCD_IO_MODE
|
||||
|
||||
# ifndef LCD_PORT
|
||||
# define LCD_PORT PORTA /**< port for the LCD lines */
|
||||
# endif
|
||||
# ifndef LCD_DATA0_PORT
|
||||
# define LCD_DATA0_PORT LCD_PORT /**< port for 4bit data bit 0 */
|
||||
# endif
|
||||
# ifndef LCD_DATA1_PORT
|
||||
# define LCD_DATA1_PORT LCD_PORT /**< port for 4bit data bit 1 */
|
||||
# endif
|
||||
# ifndef LCD_DATA2_PORT
|
||||
# define LCD_DATA2_PORT LCD_PORT /**< port for 4bit data bit 2 */
|
||||
# endif
|
||||
# ifndef LCD_DATA3_PORT
|
||||
# define LCD_DATA3_PORT LCD_PORT /**< port for 4bit data bit 3 */
|
||||
# endif
|
||||
# ifndef LCD_DATA0_PIN
|
||||
# define LCD_DATA0_PIN 4 /**< pin for 4bit data bit 0 */
|
||||
# endif
|
||||
# ifndef LCD_DATA1_PIN
|
||||
# define LCD_DATA1_PIN 5 /**< pin for 4bit data bit 1 */
|
||||
# endif
|
||||
# ifndef LCD_DATA2_PIN
|
||||
# define LCD_DATA2_PIN 6 /**< pin for 4bit data bit 2 */
|
||||
# endif
|
||||
# ifndef LCD_DATA3_PIN
|
||||
# define LCD_DATA3_PIN 7 /**< pin for 4bit data bit 3 */
|
||||
# endif
|
||||
# ifndef LCD_RS_PORT
|
||||
# define LCD_RS_PORT LCD_PORT /**< port for RS line */
|
||||
# endif
|
||||
# ifndef LCD_RS_PIN
|
||||
# define LCD_RS_PIN 3 /**< pin for RS line */
|
||||
# endif
|
||||
# ifndef LCD_RW_PORT
|
||||
# define LCD_RW_PORT LCD_PORT /**< port for RW line */
|
||||
# endif
|
||||
# ifndef LCD_RW_PIN
|
||||
# define LCD_RW_PIN 2 /**< pin for RW line */
|
||||
# endif
|
||||
# ifndef LCD_E_PORT
|
||||
# define LCD_E_PORT LCD_PORT /**< port for Enable line */
|
||||
# endif
|
||||
# ifndef LCD_E_PIN
|
||||
# define LCD_E_PIN 1 /**< pin for Enable line */
|
||||
# endif
|
||||
|
||||
#elif defined(__AVR_AT90S4414__) || defined(__AVR_AT90S8515__) || defined(__AVR_ATmega64__) || defined(__AVR_ATmega8515__) || defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega161__) || defined(__AVR_ATmega162__)
|
||||
/*
|
||||
* memory mapped mode is only supported when the device has an external data memory interface
|
||||
*/
|
||||
# define LCD_IO_DATA 0xC000 /* A15=E=1, A14=RS=1 */
|
||||
# define LCD_IO_FUNCTION 0x8000 /* A15=E=1, A14=RS=0 */
|
||||
# define LCD_IO_READ 0x0100 /* A8 =R/W=1 (R/W: 1=Read, 0=Write */
|
||||
|
||||
#else
|
||||
# error "external data memory interface not available for this device, use 4-bit IO port mode"
|
||||
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @name Definitions of delays
|
||||
* Used to calculate delay timers.
|
||||
* Adapt the F_CPU define in the Makefile to the clock frequency in Hz of your target
|
||||
*
|
||||
* These delay times can be adjusted, if some displays require different delays.\n
|
||||
* These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
|
||||
* adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile.
|
||||
* All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
|
||||
*/
|
||||
#ifndef LCD_DELAY_BOOTUP
|
||||
# define LCD_DELAY_BOOTUP 16000 /**< delay in micro seconds after power-on */
|
||||
#endif
|
||||
#ifndef LCD_DELAY_INIT
|
||||
# define LCD_DELAY_INIT 5000 /**< delay in micro seconds after initialization command sent */
|
||||
#endif
|
||||
#ifndef LCD_DELAY_INIT_REP
|
||||
# define LCD_DELAY_INIT_REP 64 /**< delay in micro seconds after initialization command repeated */
|
||||
#endif
|
||||
#ifndef LCD_DELAY_INIT_4BIT
|
||||
# define LCD_DELAY_INIT_4BIT 64 /**< delay in micro seconds after setting 4-bit mode */
|
||||
#endif
|
||||
#ifndef LCD_DELAY_BUSY_FLAG
|
||||
# define LCD_DELAY_BUSY_FLAG 4 /**< time in micro seconds the address counter is updated after busy flag is cleared */
|
||||
#endif
|
||||
#ifndef LCD_DELAY_ENABLE_PULSE
|
||||
# define LCD_DELAY_ENABLE_PULSE 1 /**< enable signal pulse width in micro seconds */
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @name Definitions for LCD command instructions
|
||||
* The constants define the various LCD controller instructions which can be passed to the
|
||||
* function lcd_command(), see HD44780 data sheet for a complete description.
|
||||
*/
|
||||
|
||||
/* instruction register bit positions, see HD44780U data sheet */
|
||||
#define LCD_CLR 0 /* DB0: clear display */
|
||||
#define LCD_HOME 1 /* DB1: return to home position */
|
||||
#define LCD_ENTRY_MODE 2 /* DB2: set entry mode */
|
||||
#define LCD_ENTRY_INC 1 /* DB1: 1=increment, 0=decrement */
|
||||
#define LCD_ENTRY_SHIFT 0 /* DB2: 1=display shift on */
|
||||
#define LCD_ON 3 /* DB3: turn lcd/cursor on */
|
||||
#define LCD_ON_DISPLAY 2 /* DB2: turn display on */
|
||||
#define LCD_ON_CURSOR 1 /* DB1: turn cursor on */
|
||||
#define LCD_ON_BLINK 0 /* DB0: blinking cursor ? */
|
||||
#define LCD_MOVE 4 /* DB4: move cursor/display */
|
||||
#define LCD_MOVE_DISP 3 /* DB3: move display (0-> cursor) ? */
|
||||
#define LCD_MOVE_RIGHT 2 /* DB2: move right (0-> left) ? */
|
||||
#define LCD_FUNCTION 5 /* DB5: function set */
|
||||
#define LCD_FUNCTION_8BIT 4 /* DB4: set 8BIT mode (0->4BIT mode) */
|
||||
#define LCD_FUNCTION_2LINES 3 /* DB3: two lines (0->one line) */
|
||||
#define LCD_FUNCTION_10DOTS 2 /* DB2: 5x10 font (0->5x7 font) */
|
||||
#define LCD_CGRAM 6 /* DB6: set CG RAM address */
|
||||
#define LCD_DDRAM 7 /* DB7: set DD RAM address */
|
||||
#define LCD_BUSY 7 /* DB7: LCD is busy */
|
||||
|
||||
/* set entry mode: display shift on/off, dec/inc cursor move direction */
|
||||
#define LCD_ENTRY_DEC 0x04 /* display shift off, dec cursor move dir */
|
||||
#define LCD_ENTRY_DEC_SHIFT 0x05 /* display shift on, dec cursor move dir */
|
||||
#define LCD_ENTRY_INC_ 0x06 /* display shift off, inc cursor move dir */
|
||||
#define LCD_ENTRY_INC_SHIFT 0x07 /* display shift on, inc cursor move dir */
|
||||
|
||||
/* display on/off, cursor on/off, blinking char at cursor position */
|
||||
#define LCD_DISP_OFF 0x08 /* display off */
|
||||
#define LCD_DISP_ON 0x0C /* display on, cursor off */
|
||||
#define LCD_DISP_ON_BLINK 0x0D /* display on, cursor off, blink char */
|
||||
#define LCD_DISP_ON_CURSOR 0x0E /* display on, cursor on */
|
||||
#define LCD_DISP_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */
|
||||
|
||||
/* move cursor/shift display */
|
||||
#define LCD_MOVE_CURSOR_LEFT 0x10 /* move cursor left (decrement) */
|
||||
#define LCD_MOVE_CURSOR_RIGHT 0x14 /* move cursor right (increment) */
|
||||
#define LCD_MOVE_DISP_LEFT 0x18 /* shift display left */
|
||||
#define LCD_MOVE_DISP_RIGHT 0x1C /* shift display right */
|
||||
|
||||
/* function set: set interface data length and number of display lines */
|
||||
#define LCD_FUNCTION_4BIT_1LINE 0x20 /* 4-bit interface, single line, 5x7 dots */
|
||||
#define LCD_FUNCTION_4BIT_2LINES 0x28 /* 4-bit interface, dual line, 5x7 dots */
|
||||
#define LCD_FUNCTION_8BIT_1LINE 0x30 /* 8-bit interface, single line, 5x7 dots */
|
||||
#define LCD_FUNCTION_8BIT_2LINES 0x38 /* 8-bit interface, dual line, 5x7 dots */
|
||||
|
||||
#define LCD_MODE_DEFAULT ((1 << LCD_ENTRY_MODE) | (1 << LCD_ENTRY_INC))
|
||||
|
||||
/**
|
||||
* @name Functions
|
||||
*/
|
||||
|
||||
/**
|
||||
@brief Initialize display and select type of cursor
|
||||
@param dispAttr \b LCD_DISP_OFF display off\n
|
||||
\b LCD_DISP_ON display on, cursor off\n
|
||||
\b LCD_DISP_ON_CURSOR display on, cursor on\n
|
||||
\b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing
|
||||
@return none
|
||||
*/
|
||||
extern void lcd_init(uint8_t dispAttr);
|
||||
|
||||
/**
|
||||
@brief Clear display and set cursor to home position
|
||||
@return none
|
||||
*/
|
||||
extern void lcd_clrscr(void);
|
||||
|
||||
/**
|
||||
@brief Set cursor to home position
|
||||
@return none
|
||||
*/
|
||||
extern void lcd_home(void);
|
||||
|
||||
/**
|
||||
@brief Set cursor to specified position
|
||||
|
||||
@param x horizontal position\n (0: left most position)
|
||||
@param y vertical position\n (0: first line)
|
||||
@return none
|
||||
*/
|
||||
extern void lcd_gotoxy(uint8_t x, uint8_t y);
|
||||
|
||||
/**
|
||||
@brief Display character at current cursor position
|
||||
@param c character to be displayed
|
||||
@return none
|
||||
*/
|
||||
extern void lcd_putc(char c);
|
||||
|
||||
/**
|
||||
@brief Display string without auto linefeed
|
||||
@param s string to be displayed
|
||||
@return none
|
||||
*/
|
||||
extern void lcd_puts(const char *s);
|
||||
|
||||
/**
|
||||
@brief Display string from program memory without auto linefeed
|
||||
@param progmem_s string from program memory be be displayed
|
||||
@return none
|
||||
@see lcd_puts_P
|
||||
*/
|
||||
extern void lcd_puts_p(const char *progmem_s);
|
||||
|
||||
/**
|
||||
@brief Send LCD controller instruction command
|
||||
@param cmd instruction to send to LCD controller, see HD44780 data sheet
|
||||
@return none
|
||||
*/
|
||||
extern void lcd_command(uint8_t cmd);
|
||||
|
||||
/**
|
||||
@brief Send data byte to LCD controller
|
||||
|
||||
Similar to lcd_putc(), but without interpreting LF
|
||||
@param data byte to send to LCD controller, see HD44780 data sheet
|
||||
@return none
|
||||
*/
|
||||
extern void lcd_data(uint8_t data);
|
||||
|
||||
/**
|
||||
@brief macros for automatically storing string constant in program memory
|
||||
*/
|
||||
#define lcd_puts_P(__s) lcd_puts_p(PSTR(__s))
|
||||
|
||||
/**@}*/
|
||||
Loading…
Reference in a new issue