Posted on November 18, 2013 at 08:25
I am fighting with this from couple of days. My uC is STM32F407VG.
I want to sample 3 triggered channels. For now I am triggering ADC using software but finaly I will use timer and dma, but for now I can't figure out how to configure ADC to do exactly 3 conversions and fire interrupt after each conversion. Could someone point me out what I am doing wrong in this sample code?
#include ''arch/stm32f4xx/stm32f4xx.h''
static
volatile
int
g_adc_cnt;
static
uint32_t adc_data[ 3 ];
void
ADC_IRQHandler(
void
)
{
uint32_t status = READ_REG( ADC2->SR );
if
( status & ADC_SR_EOC )
adc_data[ g_adc_cnt++ ] = READ_REG( ADC2->DR );
}
int
main(
void
)
{
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
ADC_CommonInitTypeDef adc_cmn;
adc_cmn.ADC_Mode = ADC_Mode_Independent;
adc_cmn.ADC_Prescaler = ADC_Prescaler_Div2;
// 16MHz / 2 = 8MHz
adc_cmn.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
adc_cmn.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_20Cycles;
ADC_CommonInit(&adc_cmn);
ADC_InitTypeDef adc2_conf;
adc2_conf.ADC_Resolution = ADC_Resolution_12b;
adc2_conf.ADC_ScanConvMode = ENABLE;
adc2_conf.ADC_ContinuousConvMode = DISABLE;
adc2_conf.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
adc2_conf.ADC_ExternalTrigConv = 0;
adc2_conf.ADC_DataAlign = ADC_DataAlign_Right;
adc2_conf.ADC_NbrOfConversion = 3;
ADC_Init(ADC2, &adc2_conf);
ADC_DiscModeChannelCountConfig(ADC2, 3);
ADC_DiscModeCmd(ADC2, ENABLE);
ADC_ITConfig(ADC2, ADC_IT_EOC, ENABLE);
ADC_RegularChannelConfig(ADC2, ADC_Channel_10, 1, ADC_SampleTime_480Cycles);
ADC_RegularChannelConfig(ADC2, ADC_Channel_13, 2, ADC_SampleTime_480Cycles);
ADC_RegularChannelConfig(ADC2, ADC_Channel_12, 3, ADC_SampleTime_480Cycles);
ADC_Cmd(ADC2, ENABLE);
NVIC_InitTypeDef nvic;
nvic.NVIC_IRQChannel = ADC_IRQn;
nvic.NVIC_IRQChannelPreemptionPriority = 3;
nvic.NVIC_IRQChannelSubPriority = 0;
nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&nvic);
while
( 1 )
{
ADC_SoftwareStartConv(ADC2);
do
{ ; }
while
( g_adc_cnt < 3 );
__NOP();
// Never gets here
g_adc_cnt = 0;
}
return
0;
}
#stm32-adc-group-interrupt
