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| author |  Drashna Jaelre <drashna@live.com> | 2019-10-07 19:08:14 -0700 |
|---|---|---|
| committer |  noroadsleft <18669334+noroadsleft@users.noreply.github.com> | 2019-10-07 19:08:14 -0700 |
| commit | 403c139b34fe97f61eedb4a3cc4772d58bce0efc (patch) | |
| tree | 9bea09394dc8d8deb78c876a843efb6a4d8c0e20 /docs/internals_gpio_control.md | |
| parent | dc5876a8e62aa0f627aee85bca3a78a94f94fc5d (diff) | |
| download | qmk_firmware-403c139b34fe97f61eedb4a3cc4772d58bce0efc.tar.gz | |
[Docs] Add AVR and ARM examples to GPIO Commands (#6942)
* [Docs] Add AVR and ARM examples to GPIO Commands
Add examples for reference for people not as well versed in microcontroller coding, such as myself.
* Apply suggestions from code review
Co-Authored-By: fauxpark <fauxpark@gmail.com>
Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>
Diffstat (limited to 'docs/internals_gpio_control.md')
| -rw-r--r-- | docs/internals_gpio_control.md | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/docs/internals_gpio_control.md b/docs/internals_gpio_control.md index 51a549f1c..8b8351382 100644 --- a/docs/internals_gpio_control.md +++ b/docs/internals_gpio_control.md @@ -6,18 +6,17 @@ QMK has a GPIO control abstraction layer which is microcontroller agnostic. This The following functions can provide basic control of GPIOs and are found in `quantum/quantum.h`. -|Function |Description | -|----------------------|------------------------------------------------------------------| -|`setPinInput(pin)` |Set pin as input with high impedance (High-Z) | -|`setPinInputHigh(pin)`|Set pin as input with build in pull-up | -|`setPinInputLow(pin)` |Set pin as input with build in pull-down (Supported only on STM32)| -|`setPinOutput(pin)` |Set pin as output | -|`writePinHigh(pin)` |Set pin level as high, assuming it is an output | -|`writePinLow(pin)` |Set pin level as low, assuming it is an output | -|`writePin(pin, level)`|Set pin level, assuming it is an output | -|`readPin(pin)` |Returns the level of the 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 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. - |