Merge pull request #9560 from RobVlaar/analogin-fix-stm32l0xx

Reset internal vref buffer after an ADC conversion

Author: 0xc0170

targets/TARGET_STM/TARGET_STM32L0/analogin_device.c

@@ -175,11 +175,13 @@ uint16_t adc_read(analogin_t *obj)
     HAL_ADC_Start(&obj->handle); // Start conversion
 
     // Wait end of conversion and get value
+    uint16_t adcValue = 0;
     if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
-        return (uint16_t)HAL_ADC_GetValue(&obj->handle);
-    } else {
-        return 0;
+        adcValue = (uint16_t)HAL_ADC_GetValue(&obj->handle);
     }
+    sConfig.Rank = ADC_RANK_NONE;
+    HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
+    return adcValue;	
 }
 
 #endif