Hi,
I am using stm32f051r4 for my project . I want to configure multiple channel ADC using DMA and my configurations are as follows .
void adc_configuration()
{
RCC->AHBENR |= RCC_AHBENR_GPIOCEN; // Enable clock for used IO pins
GPIOC->MODER |= BIT(9) | BIT(8); // Analog mode
GPIOA->MODER |= BIT(15) | BIT(14);
ADC1->CR &= ~ADC_CR_ADEN;
RCC->APB2ENR |= RCC_APB2ENR_ADCEN; //Select a clock source for the ADC
RCC->CR2 |= RCC_CR2_HSI14ON;
while(!(RCC->CR2 & RCC_CR2_HSI14RDY));
ADC1->CFGR2 |= ADC_CFGR2_CKMODE_0; // Asynchronous clock mode
ADC1->CFGR1 |= ADC_CFGR1_CONT;
ADC1->CFGR1 |= 0x00000000;
ADC1->CFGR1 |= ADC_CFGR1_SCANDIR | ADC_CFGR1_DMACFG |ADC_CFGR1_DMAEN;
ADC1->CFGR1 &= ~(ADC_CFGR1_ALIGN); // Right alignment, Upward scan
ADC1->SMPR &= ~ADC_SMPR_SMP; // 1.5 ADC clock cycles
ADC1->CHSELR |= ADC_CHSELR_CHSEL14|ADC_CHSELR_CHSEL7;
ADC1->IER |= ADC_IER_EOSEQIE ;
ADC1->ISR |= ADC_ISR_EOSEQ;
ADC1->CR |= ADC_CR_ADEN;
//while(!(ADC1->ISR & ADC_ISR_ADRDY));
//NVIC_EnableIRQ(ADC1_COMP_IRQn);
}
void DMA_config()
{
RCC->AHBENR |= RCC_AHBENR_DMA1EN;
ADC1->CFGR1 |= ADC_CFGR1_DMAEN;
DMA1_Channel1->CPAR = (uint32_t) (&(ADC1->DR));
DMA1_Channel1->CMAR = (uint32_t)(ADC_array);
DMA1_Channel1->CNDTR = 3;
DMA1_Channel1->CCR |= DMA_CCR_MINC | DMA_CCR_MSIZE_0 | DMA_CCR_PSIZE_0 | DMA_CCR_TEIE | DMA_CCR_TCIE ;
DMA1_Channel1->CCR |= DMA_CCR_EN;
NVIC_EnableIRQ(DMA1_Channel1_IRQn);
NVIC_SetPriority(DMA1_Channel1_IRQn,0);
}
As I am new to DMA, I want to know whether these configurations are correct or not and how to obtain the ADC multiple channel conversion results . I have tried to enable both the DMA and ADC interrupts randomly , but while debuging it doesn't enter both the ISR . How can I resolve these issues . Any help would be greatly appreciated.@Community member
