[NUCLEO_L152RE] Fix issue with analog_out and -O3/Otime options

Author: bcostm

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

@@ -65,14 +65,14 @@ void analogout_init(dac_t *obj, PinName pin) {
     DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
     DAC_InitStructure.DAC_OutputBuffer   = DAC_OutputBuffer_Disable;
 
-    if (pin == PA_4) {
+    if (obj->channel == PA_4) {
       DAC_Init(DAC_Channel_1, &DAC_InitStructure);
       DAC_Cmd(DAC_Channel_1, ENABLE);
     }
-    else { // PA_5
-      DAC_Init(DAC_Channel_2, &DAC_InitStructure);
-      DAC_Cmd(DAC_Channel_2, ENABLE);
-    }
+    //if (obj->channel == PA_5) {
+    //  DAC_Init(DAC_Channel_2, &DAC_InitStructure);
+    //  DAC_Cmd(DAC_Channel_2, ENABLE);
+    //}
 
     analogout_write_u16(obj, 0);
 }
@@ -84,18 +84,19 @@ static inline void dac_write(dac_t *obj, uint16_t value) {
     if (obj->channel == PA_4) {
       DAC_SetChannel1Data(DAC_Align_12b_R, value);
     }
-    else { // PA_5
-      DAC_SetChannel2Data(DAC_Align_12b_R, value);
-    }
+    //if (obj->channel == PA_5) {
+    //  DAC_SetChannel2Data(DAC_Align_12b_R, value);
+    //}
 }
 
 static inline int dac_read(dac_t *obj) {
     if (obj->channel == PA_4) {
       return (int)DAC_GetDataOutputValue(DAC_Channel_1);
     }
-    else { // PA_5
-      return (int)DAC_GetDataOutputValue(DAC_Channel_2);
-    }
+    //if (obj->channel == PA_5) {
+    //  return (int)DAC_GetDataOutputValue(DAC_Channel_2);
+    //}
+    return 0;
 }
 
 void analogout_write(dac_t *obj, float value) {