STM32L0 ADC TEMPERATURE CHANNEL rework

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32L0/analogin_device.c

@@ -172,12 +172,6 @@ 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

targets/TARGET_STM/TARGET_STM32L0/device/stm32l0xx_hal_adc.c

@@ -280,9 +280,8 @@
 #define ADC_STAB_DELAY_US       ((uint32_t) 1U)
 
 /* Delay for temperature sensor stabilization time. */
-/* Maximum delay is 10us (refer to device datasheet, parameter tSTART). */
 /* Unit: us */
-#define ADC_TEMPSENSOR_DELAY_US ((uint32_t) 10U) 
+#define ADC_TEMPSENSOR_DELAY_US ((uint32_t) 20000U)
 /**
   * @}
   */