2channels ADC + DMA + TIMER

[tom23]

Posted on January 04, 2014 at 22:51

Hello,

I would like to sample 2 analog channels with 100kHz (STM32F429 disco). I found examples only with one channel. I tryed to edit it, but my code dont work. If I placed breakpoint into DMA2_Stream4_IRQHandler() , program never break there. thanks for help

#include ''stm32f4xx.h''
#define BUFFERSIZE 100 // What size is neccesarry?
__IO uint16_t ADCConvertedValue[BUFFERSIZE];
void
GPIO_config(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_StructInit(&GPIO_InitStructure);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; 
// ADC channel 5
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; 
// ADC channel 13
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void
ADC_config(
void
)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_StructInit(&ADC_InitStructure);
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_CommonStructInit(&ADC_CommonInitStructure);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitStructure.ADC_ScanConvMode = ENABLE; 
// more then 1 channel in group
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; 
// conversions triggered
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
ADC_InitStructure.ADC_NbrOfConversion = 2;
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_Init(ADC1,&ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 1, ADC_SampleTime_112Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_112Cycles);
// Enable DMA request after last transfer (Single-ADC mode)
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
//Enable ADC1 DMA
ADC_DMACmd(ADC1, ENABLE);
// Enable ADC1
ADC_Cmd(ADC1, ENABLE);
}
void
DMA_config()
{
DMA_InitTypeDef DMA_InitStructure;
DMA_StructInit(&DMA_InitStructure);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);
//==Configure DMA2 - Stream 4
DMA_DeInit(DMA2_Stream4); 
//Set DMA registers to default values
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR; 
//Source address
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCConvertedValue[0]; 
//Destination address
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = BUFFERSIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; 
//source size - 16bit
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; 
// destination size = 16b
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream4, &DMA_InitStructure); 
/* Enable DMA - Transfer Complete interrupt */
DMA_ITConfig(DMA2_Stream4, DMA_IT_TC, ENABLE);
/* DMA2_Stream4 enable */
DMA_Cmd(DMA2_Stream4, ENABLE);
}
void
TIM2_config()
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
/* Time base configuration */
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = (180000000 / 100000) - 1; 
// 180M/100k = 1800tick = 10us - Is correct?
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* TIM2 TRGO selection */
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
void
NVIC_config()
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the DMA Stream IRQ Channel */
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure); 
}
void
DMA2_Stream4_IRQHandler(
void
)
{
/* Test on DMA Stream Transfer Complete interrupt */
if
(DMA_GetITStatus(DMA2_Stream4, DMA_IT_TCIF0))
{
/* Clear DMA Stream Transfer Complete interrupt pending bit */
DMA_ClearITPendingBit(DMA2_Stream4, DMA_IT_TCIF0);
}
}
int
main(
void
)
{
GPIO_config();
NVIC_config();
TIM2_config();
DMA_config();
ADC_config();
// I need SysTick_Handler() per 1ms
if
(SysTick_Config(SystemCoreClock / 1000))
{
/* Capture error */
while
(1);
} 
// start ADC conversion
ADC_SoftwareStartConv(ADC1);
while
(1)
{
}
}

#adc #dma #timer-2channels

[tom23]

Posted on January 06, 2014 at 17:36

I am sorry, but I don't know what you mean.... 

Can I sample two channels in timer interupt? In future I would like to sample more signals...

[Tesla DeLorean]

Posted on January 06, 2014 at 18:10

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; // The Address of &ADC1->DR in NOT incrementing