Add ADC support for STM32F3 and STM32F0 devices (#7681)

* Add ADC support for STM32F3 and STM32F0 devices

* Add section about configration options available to the ARM ADC implementation

* Fix STM32 typo

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/arm/analog.h b/drivers/arm/analog.h
new file mode 100644
index 0000000000..081d0c1e76
--- /dev/null
+++ b/drivers/arm/analog.h
@@ -0,0 +1,60 @@
+/* Copyright 2019 Drew Mills
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+#include "ch.h"
+#include <hal.h>
+
+
+#if !defined(STM32F0XX) && !defined(STM32F3XX)
+#error "Only STM23F0 and STM32F3 devices have ADC support in QMK at this time."
+#endif
+
+#if !HAL_USE_ADC
+#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
+#error "You need to set one of the 'STM32_ADC_USE_ADCx' settings to TRUE in your mcuconf.h to use the ADC."
+#endif
+
+#if STM32_ADC_DUAL_MODE
+#error "STM32 ADC Dual Mode is not supported at this time."
+#endif
+
+#if STM32_ADCV3_OVERSAMPLING
+#error "STM32 ADCV3 Oversampling is not supported at this time."
+#endif
+
+
+
+typedef struct {
+    pin_t pin;
+    uint8_t adc;
+} pin_and_adc;
+#define PIN_AND_ADC(p,a) (pin_and_adc){p,a}
+
+
+// analogReference has been left un-defined for ARM devices.
+// void analogReference(uint8_t mode);
+
+adcsample_t analogReadPin(pin_t pin);
+adcsample_t analogReadPinAdc(pin_t pin, uint8_t adc);
+pin_and_adc pinToMux(pin_t pin);
+
+adcsample_t adc_read(pin_and_adc mux);