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Add open-drain GPIO support. (#15282)

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* Add open-drain GPIO support.

* `qmk format-c`

* Wording.

* Remove port GPIO implementations as the only board that uses it has its own internal defs anyway. Will wait for first-class handling of ports in core before reimplementing.
This commit is contained in:
Nick Brassel 2021-12-27 11:52:10 +11:00 committed by GitHub
parent f491e6b138
commit 6e40dfa022
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 30 additions and 47 deletions
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8
docs/internals_gpio_control.md
View file

@ -6,12 +6,14 @@ QMK has a GPIO control abstraction layer which is microcontroller agnostic. This
The following functions provide basic control of GPIOs and are found in `platforms/<platform>/gpio.h`.
|Function |Description | Old AVR Examples | Old ChibiOS/ARM Examples |
|------------------------|--------------------------------------------------|-------------------------------------------------|-------------------------------------------------|
| 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)` |
| `setPinOutput(pin)` | Set pin as output (alias of `setPinOutputPushPull`) | `DDRB \|= (1<<2)` | `palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL)` |
| `setPinOutputPushPull(pin)` | Set pin as output, push/pull mode | `DDRB \|= (1<<2)` | `palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL)` |
| `setPinOutputOpenDrain(pin)` | Set pin as output, open-drain mode | N/A (Not implemented on AVR) | `palSetLineMode(pin, PAL_MODE_OUTPUT_OPENDRAIN)` |
| `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)` |

12
platforms/arm_atsam/gpio.h
View file

@ -22,9 +22,9 @@
typedef uint8_t pin_t;
#define SAMD_PORT(pin) ((pin & 0x20) >> 5)
#define SAMD_PIN(pin) (pin & 0x1f)
#define SAMD_PIN_MASK(pin) (1 << (pin & 0x1f))
#define SAMD_PORT(pin) (((pin)&0x20) >> 5)
#define SAMD_PIN(pin) ((pin)&0x1f)
#define SAMD_PIN_MASK(pin) (1 << ((pin)&0x1f))
#define setPinInput(pin) \
do { \
@ -48,12 +48,16 @@ typedef uint8_t pin_t;
PORT->Group[SAMD_PORT(pin)].PINCFG[SAMD_PIN(pin)].bit.PULLEN = 1; \
} while (0)
#define setPinOutput(pin) \
#define setPinOutputPushPull(pin) \
do { \
PORT->Group[SAMD_PORT(pin)].DIRSET.reg = SAMD_PIN_MASK(pin); \
PORT->Group[SAMD_PORT(pin)].OUTCLR.reg = SAMD_PIN_MASK(pin); \
} while (0)
#define setPinOutputOpenDrain(pin) _Static_assert(0, "arm_atsam platform does not implement an open-drain output")
#define setPinOutput(pin) setPinOutputPushPull(pin)
#define writePinHigh(pin) \
do { \
PORT->Group[SAMD_PORT(pin)].OUTSET.reg = SAMD_PIN_MASK(pin); \

17
platforms/avr/gpio.h
View file

@ -25,7 +25,9 @@ typedef uint8_t pin_t;
#define setPinInput(pin) (DDRx_ADDRESS(pin) &= ~_BV((pin)&0xF), PORTx_ADDRESS(pin) &= ~_BV((pin)&0xF))
#define setPinInputHigh(pin) (DDRx_ADDRESS(pin) &= ~_BV((pin)&0xF), PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
#define setPinInputLow(pin) _Static_assert(0, "AVR processors cannot implement an input as pull low")
#define setPinOutput(pin) (DDRx_ADDRESS(pin) |= _BV((pin)&0xF))
#define setPinOutputPushPull(pin) (DDRx_ADDRESS(pin) |= _BV((pin)&0xF))
#define setPinOutputOpenDrain(pin) _Static_assert(0, "AVR platform does not implement an open-drain output")
#define setPinOutput(pin) setPinOutputPushPull(pin)
#define writePinHigh(pin) (PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
#define writePinLow(pin) (PORTx_ADDRESS(pin) &= ~_BV((pin)&0xF))
@ -34,16 +36,3 @@ typedef uint8_t pin_t;
#define readPin(pin) ((bool)(PINx_ADDRESS(pin) & _BV((pin)&0xF)))
#define togglePin(pin) (PORTx_ADDRESS(pin) ^= _BV((pin)&0xF))
/* Operation of GPIO by port. */
typedef uint8_t port_data_t;
#define readPort(port) PINx_ADDRESS(port)
#define setPortBitInput(port, bit) (DDRx_ADDRESS(port) &= ~_BV((bit)&0xF), PORTx_ADDRESS(port) &= ~_BV((bit)&0xF))
#define setPortBitInputHigh(port, bit) (DDRx_ADDRESS(port) &= ~_BV((bit)&0xF), PORTx_ADDRESS(port) |= _BV((bit)&0xF))
#define setPortBitOutput(port, bit) (DDRx_ADDRESS(port) |= _BV((bit)&0xF))
#define writePortBitLow(port, bit) (PORTx_ADDRESS(port) &= ~_BV((bit)&0xF))
#define writePortBitHigh(port, bit) (PORTx_ADDRESS(port) |= _BV((bit)&0xF))

24
platforms/chibios/gpio.h
View file

@ -22,10 +22,12 @@ typedef ioline_t pin_t;
/* Operation of GPIO by pin. */
#define setPinInput(pin) palSetLineMode(pin, PAL_MODE_INPUT)
#define setPinInputHigh(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLUP)
#define setPinInputLow(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLDOWN)
#define setPinOutput(pin) palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL)
#define setPinInput(pin) palSetLineMode((pin), PAL_MODE_INPUT)
#define setPinInputHigh(pin) palSetLineMode((pin), PAL_MODE_INPUT_PULLUP)
#define setPinInputLow(pin) palSetLineMode((pin), PAL_MODE_INPUT_PULLDOWN)
#define setPinOutputPushPull(pin) palSetLineMode((pin), PAL_MODE_OUTPUT_PUSHPULL)
#define setPinOutputOpenDrain(pin) palSetLineMode((pin), PAL_MODE_OUTPUT_OPENDRAIN)
#define setPinOutput(pin) setPinOutputPushPull(pin)
#define writePinHigh(pin) palSetLine(pin)
#define writePinLow(pin) palClearLine(pin)
@ -34,17 +36,3 @@ typedef ioline_t pin_t;
#define readPin(pin) palReadLine(pin)
#define togglePin(pin) palToggleLine(pin)
/* Operation of GPIO by port. */
typedef uint16_t port_data_t;
#define readPort(pin) palReadPort(PAL_PORT(pin))
#define setPortBitInput(pin, bit) palSetPadMode(PAL_PORT(pin), bit, PAL_MODE_INPUT)
#define setPortBitInputHigh(pin, bit) palSetPadMode(PAL_PORT(pin), bit, PAL_MODE_INPUT_PULLUP)
#define setPortBitInputLow(pin, bit) palSetPadMode(PAL_PORT(pin), bit, PAL_MODE_INPUT_PULLDOWN)
#define setPortBitOutput(pin, bit) palSetPadMode(PAL_PORT(pin), bit, PAL_MODE_OUTPUT_PUSHPULL)
#define writePortBitLow(pin, bit) palClearLine(PAL_LINE(PAL_PORT(pin), bit))
#define writePortBitHigh(pin, bit) palSetLine(PAL_LINE(PAL_PORT(pin), bit))