STM32L0 internal channel ADC_TEMP

Temperature measurement was not stable

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32L0/analogin_device.c

@@ -172,6 +172,12 @@ uint16_t adc_read(analogin_t *obj)
 
     HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
 
+    /* need to wait for some stabilization time after setting the TSEN bit in the ADC_CCR
+    register to wake up the temperature sensor from power down mode */
+    if (sConfig.Channel == ADC_CHANNEL_TEMPSENSOR) {
+        wait_ms(20);
+    }
+
     HAL_ADC_Start(&obj->handle); // Start conversion
 
     // Wait end of conversion and get value