Merge pull request #2924 from bcostm/adcintch_F2

STM32F2xx - Add support of ADC internal channels (temperature, VRef, VBat)

Author: sg-

targets/TARGET_STM/TARGET_STM32F2/TARGET_NUCLEO_F207ZG/PeripheralPins.c

@@ -86,7 +86,10 @@ const PinMap PinMap_ADC[] = {
     {PF_7,  ADC_3, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 5, 0)},  // ADC3_IN5
     {PF_8,  ADC_3, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 6, 0)},  // ADC3_IN6
     {PF_9,  ADC_3, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 7, 0)},  // ADC3_IN7
-    {PF_10,  ADC_3, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 8, 0)}, // ADC3_IN8
+    {PF_10, ADC_3, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 8, 0)}, // ADC3_IN8
+    {ADC_TEMP, ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 16, 0)}, // See in analogin_api.c the correct ADC channel used
+    {ADC_VREF, ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 17, 0)}, // See in analogin_api.c the correct ADC channel used
+    {ADC_VBAT, ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 18, 0)}, // See in analogin_api.c the correct ADC channel used
     {NC,   NC,    0}
 };
 

targets/TARGET_STM/TARGET_STM32F2/TARGET_NUCLEO_F207ZG/PinNames.h

@@ -43,14 +43,14 @@ extern "C" {
 #define STM_PIN_DATA_EXT(MODE, PUPD, AFNUM, CHANNEL, INVERTED)  ((int)(((MODE     & 0x0F) <<  0) |\
                                                                        ((PUPD     & 0x07) <<  4) |\
                                                                        ((AFNUM    & 0x0F) <<  7) |\
-                                                                       ((CHANNEL  & 0x0F) << 11) |\
-                                                                       ((INVERTED & 0x01) << 15)))
+                                                                       ((CHANNEL  & 0x1F) << 11) |\
+                                                                       ((INVERTED & 0x01) << 16)))
 
 #define STM_PIN_MODE(X)     (((X) >>  0) & 0x0F)
 #define STM_PIN_PUPD(X)     (((X) >>  4) & 0x07)
 #define STM_PIN_AFNUM(X)    (((X) >>  7) & 0x0F)
-#define STM_PIN_CHANNEL(X)  (((X) >> 11) & 0x0F)
-#define STM_PIN_INVERTED(X) (((X) >> 15) & 0x01)
+#define STM_PIN_CHANNEL(X)  (((X) >> 11) & 0x1F)
+#define STM_PIN_INVERTED(X) (((X) >> 16) & 0x01)
 
 #define STM_MODE_INPUT              (0)
 #define STM_MODE_OUTPUT_PP          (1)
@@ -199,6 +199,11 @@ typedef enum {
     PH_0  = 0x70,
     PH_1  = 0x71,
 
+    // ADC internal channels
+    ADC_TEMP = 0xF0,
+    ADC_VREF = 0xF1,
+    ADC_VBAT = 0xF2,
+
     // Arduino connector namings
     A0          = PA_3,
     A1          = PC_0,

targets/TARGET_STM/TARGET_STM32F2/analogin_api.c

@@ -58,8 +58,10 @@ void analogin_init(analogin_t *obj, PinName pin)
     MBED_ASSERT(function != (uint32_t)NC);
     obj->channel = STM_PIN_CHANNEL(function);
 
-    // Configure GPIO
-    pinmap_pinout(pin, PinMap_ADC);
+    // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat)
+    if ((obj->channel != 16) && (obj->channel != 17) && (obj->channel != 18)) {
+        pinmap_pinout(pin, PinMap_ADC);
+    }
 
     // Save pin number for the read function
     obj->pin = pin;
@@ -166,6 +168,15 @@ static inline uint16_t adc_read(analogin_t *obj)
         case 15:
             sConfig.Channel = ADC_CHANNEL_15;
             break;
+        case 16:
+            sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
+            break;
+        case 17:
+            sConfig.Channel = ADC_CHANNEL_VREFINT;
+            break;
+        case 18:
+            sConfig.Channel = ADC_CHANNEL_VBAT;
+            break;
         default:
             return 0;
     }