Merge pull request #10149 from jeromecoutant/PR_H7ADCINTERNAL

STM32H7 ADC internal channels

Author: 0xc0170

targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H743xI/TARGET_NUCLEO_H743ZI/PeripheralPins.c

@@ -118,9 +118,9 @@ MBED_WEAK const PinMap PinMap_ADC[] = {
 };
 
 MBED_WEAK const PinMap PinMap_ADC_Internal[] = {
-    {ADC_TEMP,   ADC_1,    STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 16, 0)},
-    {ADC_VREF,   ADC_1,    STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 17, 0)},
-    {ADC_VBAT,   ADC_1,    STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 18, 0)},
+    {ADC_TEMP,   ADC_3,    STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 18, 0)}, // ADC3_INP/INN18
+    {ADC_VREF,   ADC_3,    STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 19, 0)}, // ADC3_INP/INN19
+    {ADC_VBAT,   ADC_3,    STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 17, 0)}, // ADC3_INP/INN17
     {NC, NC, 0}
 };
 

targets/TARGET_STM/TARGET_STM32H7/analogin_device.c

@@ -190,17 +190,34 @@ uint16_t adc_read(analogin_t *obj)
             break;
         case 17:
             sConfig.Channel = ADC_CHANNEL_17;
+
+            if ((ADCName)obj->handle.Instance == ADC_3) {
+                sConfig.Channel = ADC_CHANNEL_VBAT;
+                sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5;
+            }
             break;
         case 18:
             sConfig.Channel = ADC_CHANNEL_18;
+
+            if ((ADCName)obj->handle.Instance == ADC_3) {
+                sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
+                sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5;
+            }
             break;
         case 19:
             sConfig.Channel = ADC_CHANNEL_19;
+
+            if ((ADCName)obj->handle.Instance == ADC_3) {
+                sConfig.Channel = ADC_CHANNEL_VREFINT;
+                sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5;
+            }
             break;
         default:
             return 0;
     }
 
+    LL_ADC_Disable((&obj->handle)->Instance);
+
     HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
 
     HAL_ADC_Start(&obj->handle); // Start conversion