[NUCLEO_L152RE] analog_in improvement

Author: bcostm

libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/analogin_api.c

@@ -75,7 +75,13 @@ void analogin_init(analogin_t *obj, PinName pin) {
         RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
 
         // Configure ADC
-        ADC_StructInit(&ADC_InitStructure);
+        ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
+        ADC_InitStructure.ADC_ScanConvMode = DISABLE;
+        ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
+        ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
+        ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;
+        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
+        ADC_InitStructure.ADC_NbrOfConversion = 1;
         ADC_Init(adc, &ADC_InitStructure);
 
         // Enable ADC