Posted on May 26, 2015 at 11:57Hi,
I have problem with ADC1 conversions on STM8S-Discovery.
I have configured the analogic inputs following:
PB4 - AN4
PB5 - AN5
PB6 - AN6
unsigned char ADC_Config_INT ( void )
{
GPIO_Init(ADC_PORT,ADC_15V_PIN, GPIO_MODE_IN_FL_NO_IT);
GPIO_Init(ADC_PORT,ADC_CURR_PIN, GPIO_MODE_IN_FL_NO_IT);
GPIO_Init(ADC_PORT,ADC_5V_PIN, GPIO_MODE_IN_FL_NO_IT);
/* De-Init ADC1 peripheral */
ADC1_DeInit();
/* Enable EOC interrupt */
ADC1_ITConfig(ADC1_IT_EOCIE, ENABLE);
/* Enable conversion data buffering */
ADC1_DataBufferCmd(ENABLE);
/* Enable scan mode conversion */
ADC1_ScanModeCmd(ENABLE);
/* Init ADC1 peripheral */
/* ADC1 Channel 4 */
ADC1_Init(ADC1_CONVERSIONMODE_CONTINUOUS, ADC1_CHANNEL_4, ADC1_PRESSEL_FCPU_D8, \
ADC1_EXTTRIG_TIM, DISABLE, ADC1_ALIGN_RIGHT, ADC1_SCHMITTTRIG_CHANNEL4,\
DISABLE);
/* ADC1 Channel 5 */
ADC1_Init(ADC1_CONVERSIONMODE_CONTINUOUS, ADC1_CHANNEL_5, ADC1_PRESSEL_FCPU_D8, \
ADC1_EXTTRIG_TIM, DISABLE, ADC1_ALIGN_RIGHT, ADC1_SCHMITTTRIG_CHANNEL5,\
DISABLE);
/* ADC1 Channel 6 */
ADC1_Init(ADC1_CONVERSIONMODE_CONTINUOUS, ADC1_CHANNEL_6, ADC1_PRESSEL_FCPU_D8, \
ADC1_EXTTRIG_TIM, DISABLE, ADC1_ALIGN_RIGHT, ADC1_SCHMITTTRIG_CHANNEL6,\
DISABLE);
/* Enable ADC1 */
ADC1_Cmd(ENABLE);
return 0;
}
the interrupt function code is:
#define ADC_SAMPLES 8
extern volatile uint16_t ValueCh4[ADC_SAMPLES];
extern volatile uint16_t ValueCh5[ADC_SAMPLES];
extern volatile uint16_t ValueCh6[ADC_SAMPLES];
volatile uint8_t Index = 0;
extern uint8_t ArrayEmpty;
/**
* @brief ADC1 interrupt routine.
* @param None
* @retval None
*/
INTERRUPT_HANDLER(ADC1_IRQHandler, 22)
{
if ( ADC1_GetFlagStatus(ADC1_FLAG_EOC) != RESET )
{
ValueCh4[Index] = ADC1_GetBufferValue(4);
ValueCh5[Index] = ADC1_GetBufferValue(5);
ValueCh6[Index] = ADC1_GetBufferValue(6);
// Controlla se ho acquisito un numero sufficiente di campioni
if( Index >= ADC_SAMPLES )
{
ArrayEmpty = 1;
Index = 0;
}
else{
Index++;
}
ADC1_ClearFlag(ADC1_FLAG_EOC);
}
return;
}
The ''ADC1_GetBufferValue'' function return the value correct the first time only.
If I modified the value on pin PB4 for example, continuos at read the previous value.
Any idea?
Thanks
