From 41b8eda589e4b1ba8b70fbaccd255061e272f7c1 Mon Sep 17 00:00:00 2001
From: bcostm <bco.stm@gmail.com>
Date: Mon, 21 Nov 2016 13:07:26 +0100
Subject: [PATCH] STM32F4 - Clear VBATE and TSVREFE bits before configuring ADC
 channels

---
 targets/TARGET_STM/TARGET_STM32F4/analogin_api.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/targets/TARGET_STM/TARGET_STM32F4/analogin_api.c b/targets/TARGET_STM/TARGET_STM32F4/analogin_api.c
index f2204a1551..4cc67f0bf4 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/analogin_api.c
+++ b/targets/TARGET_STM/TARGET_STM32F4/analogin_api.c
@@ -183,13 +183,14 @@ static inline uint16_t adc_read(analogin_t *obj)
             return 0;
     }
 
+    ADC->CCR &= ~(ADC_CCR_VBATE | ADC_CCR_TSVREFE); // Workaround
     HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
 
     HAL_ADC_Start(&AdcHandle); // Start conversion
 
     // Wait end of conversion and get value
     if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
-        return (HAL_ADC_GetValue(&AdcHandle));
+        return (uint16_t)HAL_ADC_GetValue(&AdcHandle);
     } else {
         return 0;
     }