Hi, I am using 6 ADC channels ADC_Channel_15,ADC_Channel_14,ADC_Channel_13,ADC_Channel_11, ADC_Channel_4,ADC_Channel_6 of STM32F107VCT6 MCU to connect to 6 devices.
I use mutichannel continuous conversion mode of ADC sampling. I enable EOC(End Of Conversion) interrupt so that i get an interrupt after a cycle of conversion is done.
I use DMA to save the converted data. When I read back the data after an interrupt is triggered, I am all getting zeros. When I instead use a polling method where I
just go and poll the channels, I could read valid data. Can any one help me with this?
/external Variables --------------------------------------/
uint16_t ADC_ConvertedValue[6];
b00l flag
/* Private variables ---------------------------------------------------------*/
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO , ENABLE);
/* PCLK2 is the APB2 clock */
/* ADCCLK = PCLK2/6 = 72/6 = 12MHz - ADCCLK should be less than 14MHz*/
RCC_ADCCLKConfig(RCC_PCLK2_Div6);
/* Enable ADC1 clock so that we can talk to it */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* Configure GPIO pins to have photo sensors connected to ADC channels */
GPIO_InitStructure.GPIO_Pin = R_PS_ID0_PIN | R_PS_ID1_PIN | R_PS_ID2_PIN | R_PS_ID3_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(R_PS_ADC_GPIO_PORT_C, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = R_PS_ID4_PIN | R_PS_ID5_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(R_PS_ADC_GPIO_PORT_A, &GPIO_InitStructure);
/* Disable the alternative GPIO pins so that ADC channel will be active */
GPIO_WriteBit(R_PS_ADC_GPIO_PORT_C, R_PS_ID0_PIN, Bit_RESET);
GPIO_WriteBit(R_PS_ADC_GPIO_PORT_C, R_PS_ID1_PIN, Bit_RESET);
GPIO_WriteBit(R_PS_ADC_GPIO_PORT_C, R_PS_ID2_PIN, Bit_RESET);
GPIO_WriteBit(R_PS_ADC_GPIO_PORT_C, R_PS_ID3_PIN, Bit_RESET);
GPIO_WriteBit(R_PS_ADC_GPIO_PORT_A, R_PS_ID4_PIN, Bit_RESET);
GPIO_WriteBit(R_PS_ADC_GPIO_PORT_A, R_PS_ID5_PIN, Bit_RESET);
/* DMA Channel1 Configuration ----------------------------------------------*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) &ADC_ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 6;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* Enable DMA Channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADCx Configuration (ADC1CLK = 12 MHz) -----------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 6;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADCx Regular Channel Configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 1, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 2, ADC_SampleTime_7Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 3, ADC_SampleTime_13Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 4, ADC_SampleTime_28Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 5, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 6, ADC_SampleTime_55Cycles5);
/* Enable ADCx’s DMA interface */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADCx */
ADC_Cmd(ADC1, ENABLE);
ADC_ITConfig(ADC1,ADC_IT_EOC,ENABLE);
My_ADC_IT_Config();
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
while (1)
{
if(flag == TRUE)
{
printf(“\r\n%d,%d,%d,%d,%d,%d\n”,ADC_ConvertedValue[0],ADC_ConvertedValue[1],ADC_ConvertedValue[2],
ADC_ConvertedValue[3],ADC_ConvertedValue[4],ADC_ConvertedValue[5]);
flag = FALSE;
}
}
/NVIC Configurations***/
void R_ADC_IT_Config()
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
/* Configure and enable ADC interrupt */
NVIC_InitStructure.NVIC_IRQChannel = ADC1_2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void ADC1_2_IRQHandler(void)
{
flag = TRUE;
ADC_ClearITPendingBit(ADC1, ADC_IT_EOC);
}