forked from forks/qmk_firmware
b272c035ba
* fix CLI section links in the Summary * fix heading in Pointing Device doc * fix headings in PS/2 Mouse Support doc * add explicit section ids to I2C Master Driver doc * reformat GPIO Controls table Much like the I2C Master Driver doc, I found this a bit less than ideal to read. (The table was actually wider than the space available for it.) Reformatted so each GPIO function is an H3 heading, followed by a paragraph and a table of each architecture's old-style function. * migrate changes from I2C Master Driver doc to Japanese translation * add explicit anchors to I2C Master Driver docs * fix code block language markers The language markers are case-sensitive; using the wrong case means the syntax highlighting doesn't work. Good: ```c Bad: ```C * restore Japanese I2C Master Driver doc to current master Can't update the internal tracking references accurately until the changes to the English doc are committed to master. * add explicit anchors to edited files * change ChibiOS/ARM to ARM/ChibiOS Because ARM/ATSAM is also a thing that exists. * fix code block language markers again Used the wrong markers in a few spots. Also these are apparently always supposed to be lowercase. * add section anchors to cli.md * restore table formatting on GPIO Control doc * remove changes to _summary.md
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2.5 KiB
GPIO Control :id=gpio-control
QMK has a GPIO control abstraction layer which is microcontroller agnostic. This is done to allow easy access to pin control across different platforms.
Functions :id=functions
The following functions can provide basic control of GPIOs and are found in quantum/quantum.h.
| Function | Description | Old AVR Examples | Old ChibiOS/ARM Examples |
|---|---|---|---|
setPinInput(pin) |
Set pin as input with high impedance (High-Z) | DDRB &= ~(1<<2) |
palSetLineMode(pin, PAL_MODE_INPUT) |
setPinInputHigh(pin) |
Set pin as input with builtin pull-up resistor | DDRB &= ~(1<<2); PORTB |= (1<<2) |
palSetLineMode(pin, PAL_MODE_INPUT_PULLUP) |
setPinInputLow(pin) |
Set pin as input with builtin pull-down resistor | N/A (Not supported on AVR) | palSetLineMode(pin, PAL_MODE_INPUT_PULLDOWN) |
setPinOutput(pin) |
Set pin as output | DDRB |= (1<<2) |
palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL) |
writePinHigh(pin) |
Set pin level as high, assuming it is an output | PORTB |= (1<<2) |
palSetLine(pin) |
writePinLow(pin) |
Set pin level as low, assuming it is an output | PORTB &= ~(1<<2) |
palClearLine(pin) |
writePin(pin, level) |
Set pin level, assuming it is an output | (level) ? PORTB |= (1<<2) : PORTB &= ~(1<<2) |
(level) ? palSetLine(pin) : palClearLine(pin) |
readPin(pin) |
Returns the level of the pin | _SFR_IO8(pin >> 4) & _BV(pin & 0xF) |
palReadLine(pin) |
Advanced Settings :id=advanced-settings
Each microcontroller can have multiple advanced settings regarding its GPIO. This abstraction layer does not limit the use of architecture-specific functions. Advanced users should consult the datasheet of their desired device and include any needed libraries. For AVR, the standard avr/io.h library is used; for STM32, the ChibiOS PAL library is used.