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我试图从STM32f401c迪斯科的STM32f4105VC的ADC1得到的1000个样本的序列，使用DMA交易。我希望DMA在传输完成时产生一个中断，并在那里停止，这样就不会覆盖数据。下面是代码：执行从不跳转到DMA IRQHandler在stm32f4105x
/* Private macro -------------------------------------------------------------*/
#define M 5
#define F_S 42000000
#define LOG_SIZE 1000
#define MEAS_PERIODS 1
#define DMA_BUFFER_SIZE 1000
/* Private variables ---------------------------------------------------------*/
__IO uint16_t uhADCxConvertedValue[DMA_BUFFER_SIZE] = {0};
__IO uint32_t uwADCxConvertedVoltage = 0;
double voltage=0;
double S=0, rms=0, F=0; // S quadratic sums, rms - the rms value, F the frequency
uint32_t N; //number of samplings
double unscaled_voltage=0;
uint32_t max_N=0, steady_N = 0;
typedef char MyString[50];
MyString Log[LOG_SIZE];
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
static void ADC_Config(void);
void DMA2_Stream0_IRQHandler(void) {
if(DMA_GetITStatus(DMA_STREAMx,DMA_IT_TCIF0)!=RESET) {
DMA_ClearITPendingBit(DMA_STREAMx,DMA_STREAMx,DMA_IT_TCIF0|DMA_IT_HTIF0);
}
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s)
before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/
double R = 3.0/0xfff; //conversion ratio
double dc_offset = 1.5;
double ac_scaling = 0.0022;
double mv_filter[M]={0};//moving average filter
uint8_t wave_pos=0; //0 upper half wave, 1 lower half wave
uint32_t i=0;
uint8_t i_period = 1;
/* ADC configuration */
ADC_Config();
/* Start ADC Software Conversion */
// ADC_SoftwareStartConv(ADCx);
ADC_SoftwareStartConv(ADCx);
while (1) {}
}
static void ADC_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable ADCx, DMA and GPIO clocks ****************************************/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
RCC_AHB1PeriphClockCmd(ADCx_CHANNEL_GPIO_CLK, ENABLE);
RCC_APB2PeriphClockCmd(ADCx_CLK, ENABLE);
/* Enable the DMA2 Stream0 Global Interrupt (to handle the Transfer Complete Interrupt TCIF) */
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* DMA2 Stream0 channel15 configuration **************************************/
DMA_InitStructure.DMA_Channel = DMA_CHANNELx;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADCx_DR_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&uhADCxConvertedValue[0];
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = DMA_BUFFER_SIZE;
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_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA_STREAMx, &DMA_InitStructure);
DMA_Cmd(DMA_STREAMx, ENABLE);
/* Configure ADC1 Channel15 pin as analog input ******************************/
GPIO_InitStructure.GPIO_Pin = GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIO_PORT, &GPIO_InitStructure);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC1 Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADCx, &ADC_InitStructure);
/* ADC1 regular channel15 configuration **************************************/
ADC_RegularChannelConfig(ADCx, ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);
// /* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADCx, ENABLE);
// /* Enable ADC1 DMA */
ADC_DMACmd(ADCx, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADCx, ENABLE);
DMA_ITConfig(DMA_STREAMx,DMA_IT_TC,ENABLE);
}
当我一段时间的DMA停止，TCIF0和HTIF0在寄存器DMA_LISR设置标志后，调试程序，尽管在DMA2_Stream0_IRQHandler功能断点只激活一次。为什么？
是您正在使用DMA，该方案是在不回应太慢的原因，还是只是释放了CPU？如果是后者，请忽略此评论。在前者的情况下，具有1000个样本并随后出现中断的解决方案意味着中断仍将被处理。而DMA中断可能比简单的ADC中断更复杂。所以如果你的程序已经无法处理ADC中断，它也将无法处理DMA中断。 – Lundin
这是第二种情况。 –
顺便说一句这个代码的第一个例子甚至在理论上是不可能的:)。 –