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Diffstat (limited to 'docs/internals_gpio_control.md')
| -rw-r--r-- | docs/internals_gpio_control.md | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/docs/internals_gpio_control.md b/docs/internals_gpio_control.md index 8b8351382d..74ac090355 100644 --- a/docs/internals_gpio_control.md +++ b/docs/internals_gpio_control.md @@ -1,22 +1,22 @@ -# GPIO Control +# 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 +## 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)` | +|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 +## 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](http://chibios.sourceforge.net/docs3/hal/group___p_a_l.html) is used. |