STM32L1xx - Add support of ADC internal channels (Temperature, VRef)

Author: bcostm

targets/TARGET_STM/TARGET_STM32L1/TARGET_MOTE_L152RC/PeripheralPins.c

@@ -59,6 +59,8 @@ const PinMap PinMap_ADC[] = {
     {PC_3,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 13, 0)}, // ADC_IN13
     {PC_4,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 14, 0)}, // ADC_IN14
     {PC_5,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 15, 0)}, // ADC_IN15
+    {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)},
     {NC,    NC,    0}
 };
 

targets/TARGET_STM/TARGET_STM32L1/TARGET_MOTE_L152RC/PinNames.h

@@ -133,6 +133,10 @@ typedef enum {
     //PH_0  = 0x70,
     //PH_1  = 0x71,
 
+    // ADC internal channels
+    ADC_TEMP = 0xF0,
+    ADC_VREF = 0xF1,
+
     // Arduino connector namings
     A0          = PA_0,
     A1          = PA_1,

targets/TARGET_STM/TARGET_STM32L1/TARGET_NUCLEO_L152RE/PeripheralPins.c

@@ -59,6 +59,8 @@ const PinMap PinMap_ADC[] = {
     {PC_3,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 13, 0)}, // ADC_IN13
     {PC_4,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 14, 0)}, // ADC_IN14
     {PC_5,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 15, 0)}, // ADC_IN15
+    {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)},
     {NC,    NC,    0}
 };
 

targets/TARGET_STM/TARGET_STM32L1/TARGET_NUCLEO_L152RE/PinNames.h

@@ -133,6 +133,10 @@ typedef enum {
     PH_0  = 0x70,
     PH_1  = 0x71,
 
+    // ADC internal channels
+    ADC_TEMP = 0xF0,
+    ADC_VREF = 0xF1,
+
     // Arduino connector namings
     A0          = PA_0,
     A1          = PA_1,

targets/TARGET_STM/TARGET_STM32L1/TARGET_NZ32_SC151/PeripheralPins.c

@@ -59,6 +59,8 @@ const PinMap PinMap_ADC[] = {
     {PC_3,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 13, 0)}, // ADC_IN13
     {PC_4,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 14, 0)}, // ADC_IN14
     {PC_5,  ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 15, 0)}, // ADC_IN15
+    {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)},
     {NC,    NC,    0}
 };
 

targets/TARGET_STM/TARGET_STM32L1/TARGET_NZ32_SC151/PinNames.h

@@ -133,6 +133,10 @@ typedef enum {
     PH_0  = 0x70,
     PH_1  = 0x71,
 
+    // ADC internal channels
+    ADC_TEMP = 0xF0,
+    ADC_VREF = 0xF1,
+
     // Generic signals namings
     LED1        = PB_2,
     LED2        = PB_2,

targets/TARGET_STM/TARGET_STM32L1/TARGET_XDOT_L151CC/PeripheralPins.c

@@ -49,6 +49,8 @@ const PinMap PinMap_ADC[] = {
     {PB_13, ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 19, 0)}, // ADC_IN19
     {PB_14, ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 20, 0)}, // ADC_IN20
     {PB_15, ADC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 21, 0)}, // ADC_IN21
+    {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)},
     {NC,    NC,    0}
 };
 

targets/TARGET_STM/TARGET_STM32L1/TARGET_XDOT_L151CC/PinNames.h

@@ -133,6 +133,10 @@ typedef enum {
     PH_0  = 0x70,
     PH_1  = 0x71,
 
+    // ADC internal channels
+    ADC_TEMP = 0xF0,
+    ADC_VREF = 0xF1,
+
     // GPIOs
     GPIO0           = PA_4,     // analog out capable, analog in capable
     GPIO1           = PA_5,     // analog out capable, analog in capable

targets/TARGET_STM/TARGET_STM32L1/analogin_api.c

@@ -53,8 +53,10 @@ 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)
+    if ((obj->channel != 16) && (obj->channel != 17)) {
+        pinmap_pinout(pin, PinMap_ADC);
+    }
 
     // Save pin number for the read function
     obj->pin = pin;
@@ -154,10 +156,10 @@ static inline uint16_t adc_read(analogin_t *obj)
             sConfig.Channel = ADC_CHANNEL_15;
             break;
         case 16:
-            sConfig.Channel = ADC_CHANNEL_16;
+            sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
             break;
         case 17:
-            sConfig.Channel = ADC_CHANNEL_17;
+            sConfig.Channel = ADC_CHANNEL_VREFINT;
             break;
         case 18:
             sConfig.Channel = ADC_CHANNEL_18;