diff options
| author | Nick Brassel <nick@tzarc.org> | 2021-12-27 11:52:10 +1100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-12-27 11:52:10 +1100 |
| commit | 6e40dfa0220e68a6628d9e7d18788df6bcae5473 (patch) | |
| tree | 743f0ad2504bad030b846477690fe6ceb228f580 /docs | |
| parent | f491e6b138c690263487bb791a1277b86da3a2e4 (diff) | |
Add open-drain GPIO support. (#15282)
* 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.
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/internals_gpio_control.md | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/docs/internals_gpio_control.md b/docs/internals_gpio_control.md index ccd3f8c74d..e1f1515b71 100644 --- a/docs/internals_gpio_control.md +++ b/docs/internals_gpio_control.md @@ -6,17 +6,19 @@ 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 | -|------------------------|--------------------------------------------------|-------------------------------------------------|-------------------------------------------------| -| `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)` | -| `togglePin(pin)` | Invert pin level, assuming it is an output | `PORTB ^= (1<<2)` | `palToggleLine(pin)` | +| 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 (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)` | +| `readPin(pin)` | Returns the level of the pin | `_SFR_IO8(pin >> 4) & _BV(pin & 0xF)` | `palReadLine(pin)` | +| `togglePin(pin)` | Invert pin level, assuming it is an output | `PORTB ^= (1<<2)` | `palToggleLine(pin)` | ## Advanced Settings :id=advanced-settings |