From f41c72ded8c90adafe441700725d7ec3152d097c Mon Sep 17 00:00:00 2001
From: jeromecoutant <jerome.coutant@st.com>
Date: Fri, 14 Sep 2018 12:14:40 +0200
Subject: [PATCH] STM32L1 ADC update for internal channels

---
 targets/TARGET_STM/TARGET_STM32L1/analogin_device.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/targets/TARGET_STM/TARGET_STM32L1/analogin_device.c b/targets/TARGET_STM/TARGET_STM32L1/analogin_device.c
index 907befc161..fd1fd1048a 100644
--- a/targets/TARGET_STM/TARGET_STM32L1/analogin_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L1/analogin_device.c
@@ -105,6 +105,9 @@ uint16_t adc_read(analogin_t *obj)
     ADC_ChannelConfTypeDef sConfig = {0};
 
     // Configure ADC channel
+    sConfig.Rank         = ADC_REGULAR_RANK_1;
+    sConfig.SamplingTime = ADC_SAMPLETIME_48CYCLES;
+
     switch (obj->channel) {
         case 0:
             sConfig.Channel = ADC_CHANNEL_0;
@@ -156,9 +159,11 @@ uint16_t adc_read(analogin_t *obj)
             break;
         case 16:
             sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
+            sConfig.SamplingTime = ADC_SAMPLETIME_384CYCLES;
             break;
         case 17:
             sConfig.Channel = ADC_CHANNEL_VREFINT;
+            sConfig.SamplingTime = ADC_SAMPLETIME_384CYCLES;
             break;
         case 18:
             sConfig.Channel = ADC_CHANNEL_18;
@@ -216,9 +221,6 @@ uint16_t adc_read(analogin_t *obj)
             return 0;
     }
 
-    sConfig.Rank         = ADC_REGULAR_RANK_1;
-    sConfig.SamplingTime = ADC_SAMPLETIME_16CYCLES;
-
     HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
 
     HAL_ADC_Start(&obj->handle); // Start conversion