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Add analog support for RP2040 (#19453)

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Co-authored-by: Ryan <fauxpark@gmail.com>
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Sergey Vlasov 2023-01-19 02:30:58 +03:00 • committed by GitHub
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docs/adc_driver.md
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@ -43,6 +43,8 @@ Then place this include at the top of your code:
### ARM
#### STM32
Note that some of these pins are doubled-up on ADCs with the same channel. This is because the pins can be used for either ADC.
Also note that the F0 and F3 use different numbering schemes. The F0 has a single ADC and the channels are 0-indexed, whereas the F3 has 4 ADCs and the channels are 1-indexed. This is because the F0 uses the `ADCv1` implementation of the ADC, whereas the F3 uses the `ADCv3` implementation.
@ -121,6 +123,21 @@ Also note that the F0 and F3 use different numbering schemes. The F0 has a singl
<sup>² Not all STM32F4xx devices have ADC2 and/or ADC3, therefore some configurations shown in this table may be unavailable; in particular, pins `F4`…`F10` cannot be used as ADC inputs on devices which do not have ADC3. Check the device datasheet to confirm which pin functions are supported.</sup>
#### RP2040
RP2040 has only a single ADC (`ADCD1` in ChibiOS); in the QMK API the index for that ADC is 0.
|Channel|Pin |
|-------|-------------------|
|0 |`GP26` |
|1 |`GP27` |
|2 |`GP28` |
|3 |`GP29` |
|4 |Temperature sensor*|
<sup>* The temperature sensor is disabled by default and needs to be enabled by the RP2040-specific function: `adcRPEnableTS(&ADCD1)`. The ADC must be initialized before calling that function; an easy way to ensure that is to perform a dummy conversion.</sup>
## Functions
### AVR