Module17: added VBat measurement to ADC1 driver

platform/drivers/ADC/ADC1_Mod17.c

@@ -64,15 +64,28 @@ void adc1_terminate()
 
 uint16_t adc1_getRawSample(uint8_t ch)
 {
-    if(ch > 15) return 0;
+    if(ch > 18)
+        return 0;
 
     pthread_mutex_lock(&adcMutex);
 
+    /* Channel 18 is Vbat, enable it if requested */
+    if(ch == 18)
+        ADC123_COMMON->CCR |= ADC_CCR_VBATE;
+
+
     ADC1->SQR3 = ch;
     ADC1->CR2 |= ADC_CR2_SWSTART;
     while((ADC1->SR & ADC_SR_EOC) == 0) ;
     uint16_t value = ADC1->DR;
 
+    /* Disconnect Vbat channel. Vbat has an internal x2 voltage divider */
+    if(ch == 18)
+    {
+        value *= 2;
+        ADC123_COMMON->CCR &= ~ADC_CCR_VBATE;
+    }
+
     pthread_mutex_unlock(&adcMutex);
 
     return value;

platform/drivers/ADC/ADC1_Mod17.h

@@ -35,6 +35,7 @@ enum adcCh
 {
     ADC_HWVER_CH     = 3,
     ADC_HMI_HWVER_CH = 13,
+    ADC_VBAT_CH      = 18
 };
 
 /**