Add analog support for RP2040 (#19453)

Co-authored-by: Ryan <fauxpark@gmail.com>

9 files changed, 42 insertions, 9 deletions

diff --git a/docs/adc_driver.md b/docs/adc_driver.md
index 69fff4b3c2..494d90c94f 100644
--- a/docs/adc_driver.md
+++ b/docs/adc_driver.md
@@ -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
diff --git a/docs/platformdev_rp2040.md b/docs/platformdev_rp2040.md
index 11a93edd89..b5b32c7b08 100644
--- a/docs/platformdev_rp2040.md
+++ b/docs/platformdev_rp2040.md
@@ -4,7 +4,7 @@ The following table shows the current driver status for peripherals on RP2040 MC
 
 |                              System                              |                    Support                     |
 | ---------------------------------------------------------------- | ---------------------------------------------- |
-| [ADC driver](adc_driver.md)                                      | Support planned (no ETA)                       |
+| [ADC driver](adc_driver.md)                                      | :heavy_check_mark:                             |
 | [Audio](audio_driver.md#pwm-hardware)                            | :heavy_check_mark:                             |
 | [Backlight](feature_backlight.md)                                | :heavy_check_mark:                             |
 | [I2C driver](i2c_driver.md)                                      | :heavy_check_mark:                             |
diff --git a/keyboards/handwired/onekey/rp2040/config.h b/keyboards/handwired/onekey/rp2040/config.h
index d3e7b5c076..3168d3550f 100644
--- a/keyboards/handwired/onekey/rp2040/config.h
+++ b/keyboards/handwired/onekey/rp2040/config.h
@@ -20,3 +20,5 @@
 #define AUDIO_PIN GP16
 #define AUDIO_PWM_DRIVER PWMD0
 #define AUDIO_PWM_CHANNEL RP2040_PWM_CHANNEL_A
+
+#define ADC_PIN GP26
diff --git a/keyboards/handwired/onekey/rp2040/halconf.h b/keyboards/handwired/onekey/rp2040/halconf.h
index 5890122e5e..ec56be2263 100644
--- a/keyboards/handwired/onekey/rp2040/halconf.h
+++ b/keyboards/handwired/onekey/rp2040/halconf.h
@@ -5,5 +5,6 @@
 
 #define HAL_USE_I2C TRUE
 #define HAL_USE_PWM TRUE
+#define HAL_USE_ADC TRUE
 
 #include_next <halconf.h>
diff --git a/platforms/chibios/boards/GENERIC_PROMICRO_RP2040/configs/mcuconf.h b/platforms/chibios/boards/GENERIC_PROMICRO_RP2040/configs/mcuconf.h
index 5c0859901e..ab293c0b40 100644
--- a/platforms/chibios/boards/GENERIC_PROMICRO_RP2040/configs/mcuconf.h
+++ b/platforms/chibios/boards/GENERIC_PROMICRO_RP2040/configs/mcuconf.h
@@ -46,6 +46,7 @@
 #define RP_IRQ_TIMER_ALARM1_PRIORITY        2
 #define RP_IRQ_TIMER_ALARM2_PRIORITY        2
 #define RP_IRQ_TIMER_ALARM3_PRIORITY        2
+#define RP_IRQ_ADC1_PRIORITY                3
 #define RP_IRQ_UART0_PRIORITY               3
 #define RP_IRQ_UART1_PRIORITY               3
 #define RP_IRQ_SPI0_PRIORITY                2
@@ -57,7 +58,7 @@
 /*
  * ADC driver system settings.
  */
-#define RP_ADC_USE_ADC1                     FALSE
+#define RP_ADC_USE_ADC1                     TRUE
 
 /*
  * SIO driver system settings.
diff --git a/platforms/chibios/boards/GENERIC_RP_RP2040/configs/mcuconf.h b/platforms/chibios/boards/GENERIC_RP_RP2040/configs/mcuconf.h
index f7a66c6ab9..b91d762419 100644
--- a/platforms/chibios/boards/GENERIC_RP_RP2040/configs/mcuconf.h
+++ b/platforms/chibios/boards/GENERIC_RP_RP2040/configs/mcuconf.h
@@ -46,6 +46,7 @@
 #define RP_IRQ_TIMER_ALARM1_PRIORITY        2
 #define RP_IRQ_TIMER_ALARM2_PRIORITY        2
 #define RP_IRQ_TIMER_ALARM3_PRIORITY        2
+#define RP_IRQ_ADC1_PRIORITY                3
 #define RP_IRQ_UART0_PRIORITY               3
 #define RP_IRQ_UART1_PRIORITY               3
 #define RP_IRQ_SPI0_PRIORITY                2
diff --git a/platforms/chibios/boards/QMK_PM2040/configs/halconf.h b/platforms/chibios/boards/QMK_PM2040/configs/halconf.h
index d7a58f0ea6..131386bc34 100644
--- a/platforms/chibios/boards/QMK_PM2040/configs/halconf.h
+++ b/platforms/chibios/boards/QMK_PM2040/configs/halconf.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#define HAL_USE_ADC TRUE
 #define HAL_USE_I2C TRUE
 #define HAL_USE_SPI TRUE
 
diff --git a/platforms/chibios/boards/QMK_PM2040/configs/mcuconf.h b/platforms/chibios/boards/QMK_PM2040/configs/mcuconf.h
index e33d6d785f..f19f08e93c 100644
--- a/platforms/chibios/boards/QMK_PM2040/configs/mcuconf.h
+++ b/platforms/chibios/boards/QMK_PM2040/configs/mcuconf.h
@@ -46,6 +46,7 @@
 #define RP_IRQ_TIMER_ALARM1_PRIORITY        2
 #define RP_IRQ_TIMER_ALARM2_PRIORITY        2
 #define RP_IRQ_TIMER_ALARM3_PRIORITY        2
+#define RP_IRQ_ADC1_PRIORITY                3
 #define RP_IRQ_UART0_PRIORITY               3
 #define RP_IRQ_UART1_PRIORITY               3
 #define RP_IRQ_SPI0_PRIORITY                2
@@ -57,7 +58,7 @@
 /*
  * ADC driver system settings.
  */
-#define RP_ADC_USE_ADC1                     FALSE
+#define RP_ADC_USE_ADC1                     TRUE
 
 /*
  * SIO driver system settings.
diff --git a/platforms/chibios/drivers/analog.c b/platforms/chibios/drivers/analog.c
index 8b03e73849..a8ce21bb6d 100644
--- a/platforms/chibios/drivers/analog.c
+++ b/platforms/chibios/drivers/analog.c
@@ -22,8 +22,8 @@
 #    error "You need to set HAL_USE_ADC to TRUE in your halconf.h to use the ADC."
 #endif
 
-#if !STM32_ADC_USE_ADC1 && !STM32_ADC_USE_ADC2 && !STM32_ADC_USE_ADC3 && !STM32_ADC_USE_ADC4 && !WB32_ADC_USE_ADC1
-#    error "You need to set one of the 'STM32_ADC_USE_ADCx' settings to TRUE in your mcuconf.h to use the ADC."
+#if !RP_ADC_USE_ADC1 && !STM32_ADC_USE_ADC1 && !STM32_ADC_USE_ADC2 && !STM32_ADC_USE_ADC3 && !STM32_ADC_USE_ADC4 && !WB32_ADC_USE_ADC1
+#    error "You need to set one of the 'xxx_ADC_USE_ADCx' settings to TRUE in your mcuconf.h to use the ADC."
 #endif
 
 #if STM32_ADC_DUAL_MODE
@@ -42,7 +42,7 @@
 #endif
 
 // BODGE to make v2 look like v1,3 and 4
-#ifdef USE_ADCV2
+#if defined(USE_ADCV2) || defined(RP2040)
 #    if !defined(ADC_SMPR_SMP_1P5) && defined(ADC_SAMPLE_3)
 #        define ADC_SMPR_SMP_1P5 ADC_SAMPLE_3
 #        define ADC_SMPR_SMP_7P5 ADC_SAMPLE_15
@@ -74,7 +74,7 @@
 
 /* User configurable ADC options */
 #ifndef ADC_COUNT
-#    if defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F4XX) || defined(GD32VF103) || defined(WB32F3G71xx) || defined(WB32FQ95xx)
+#    if defined(RP2040) || defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F4XX) || defined(GD32VF103) || defined(WB32F3G71xx) || defined(WB32FQ95xx)
 #        define ADC_COUNT 1
 #    elif defined(STM32F3XX)
 #        define ADC_COUNT 4
@@ -126,6 +126,8 @@ static ADCConversionGroup adcConversionGroup = {
 #    endif
     .smpr2 = ADC_SMPR2_SMP_AN0(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN1(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN2(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN3(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN4(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN5(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN6(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN7(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN8(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN9(ADC_SAMPLING_RATE),
     .smpr1 = ADC_SMPR1_SMP_AN10(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN11(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN12(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN13(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN14(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN15(ADC_SAMPLING_RATE),
+#elif defined(RP2040)
+// RP2040 does not have any extra config here
 #else
     .cfgr = ADC_CFGR_CONT | ADC_RESOLUTION,
     .smpr = {ADC_SMPR1_SMP_AN0(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN1(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN2(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN3(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN4(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN5(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN6(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN7(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN8(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN9(ADC_SAMPLING_RATE), ADC_SMPR2_SMP_AN10(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN11(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN12(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN13(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN14(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN15(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN16(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN17(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN18(ADC_SAMPLING_RATE)},
@@ -238,6 +240,11 @@ __attribute__((weak)) adc_mux pinToMux(pin_t pin) {
         case C5:  return TO_MUX( ADC_CHANNEL_IN15, 0 );
         // STM32F103x[C-G] in 144-pin packages also have analog inputs on F6...F10, but they are on ADC3, and the
         // ChibiOS ADC driver for STM32F1xx currently supports only ADC1, therefore these pins are not usable.
+#elif defined(RP2040)
+        case 26U: return TO_MUX(0, 0);
+        case 27U: return TO_MUX(1, 0);
+        case 28U: return TO_MUX(2, 0);
+        case 29U: return TO_MUX(3, 0);
 #endif
     }
 
@@ -248,7 +255,7 @@ __attribute__((weak)) adc_mux pinToMux(pin_t pin) {
 
 static inline ADCDriver* intToADCDriver(uint8_t adcInt) {
     switch (adcInt) {
-#if STM32_ADC_USE_ADC1 || WB32_ADC_USE_ADC1
+#if RP_ADC_USE_ADC1 || STM32_ADC_USE_ADC1 || WB32_ADC_USE_ADC1
         case 0:
             return &ADCD1;
 #endif
@@ -296,6 +303,8 @@ int16_t adc_read(adc_mux mux) {
     adcConversionGroup.chselr = 1 << mux.input; /*no macro to convert N to ADC_CHSELR_CHSEL1*/
 #elif defined(USE_ADCV2)
     adcConversionGroup.sqr3 = ADC_SQR3_SQ1_N(mux.input);
+#elif defined(RP2040)
+    adcConversionGroup.channel_mask = 1 << mux.input;
 #else
     adcConversionGroup.sqr[0] = ADC_SQR1_SQ1_N(mux.input);
 #endif
@@ -310,7 +319,7 @@ int16_t adc_read(adc_mux mux) {
         return 0;
     }
 
-#ifdef USE_ADCV2
+#if defined(USE_ADCV2) || defined(RP2040)
     // fake 12-bit -> N-bit scale
     return (*sampleBuffer) >> (12 - ADC_RESOLUTION);
 #else