STM32F407 ADC双通道同时采样
#include "stm32f4xx.h"
#define ADC_CDR_ADDRESS ((uint32_t)0x40012308)
#define ADC12_BUFFER_SIZE 16380
#define ADC_SAMPLE_FREQUENCY 10 //10HZ 这个采样频率的意思是 100ms采样完16380个点
uint32_t SampleSuccessFlag = 0; //采样成功标志位
__IO uint32_t ADC12ConvertedValue[ADC12_BUFFER_SIZE];//高16位保存ADC2的值，低16位保存低ADC1的值
//我的开发板的时钟频率为144M，而TIM3的频率为72M
static void TIM3_Config(void)
{
TIM_TimeBaseInitTypeDef timer_init_structure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能TIM3时钟
TIM_DeInit(TIM3); //复位TIM3
timer_init_structure.TIM_ClockDivision = TIM_CKD_DIV1; //系统时钟
timer_init_structure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
timer_init_structure.TIM_Period = ( 2000000/(ADC_SAMPLE_FREQUENCY*ADC12_BUFFER_SIZE) )-1;
timer_init_structure.TIM_Prescaler = 36 - 1; //计数时钟预分频
TIM_TimeBaseInit(TIM3, &timer_init_structure);
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
TIM_Cmd(TIM3, ENABLE); //使能TIM3
}
/*******************************************************************************
* Function Name : ADC12_Init
* Description :
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void ADC12_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable ADC1, DMA2 and GPIO clocks ****************************************/
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2, ENABLE);
/* DMA2 Stream0 channel0 configuration **************************************/
DMA_DeInit(DMA2_Stream0);
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_CDR_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC12ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = ADC12_BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
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_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream0, ENABLE);
/* Enable DMA2_Stream0 Transfer complete interrupt */
DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);
/* Enable DMA2_Stream0 IRQn Interrupt ***************************************/
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);
/* Configure ADC1 Channel0 pin as analog input ******************************/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Configure ADC2 Channel5 pin as analog input ******************************/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_InjecSimult; //双通道注入模式
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; // ( 12 + 5 + 3 ) = 20
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC1 Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;//ADC_ExternalTrigConv_T3_TRGO;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Init(ADC2, &ADC_InitStructure);
/* ADC1 regular channel8 configuration *************************************/
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_3Cycles);
/* ADC2 regular channel5 configuration *************************************/
ADC_RegularChannelConfig(ADC2, ADC_Channel_5, 1, ADC_SampleTime_3Cycles);
/* Enable DMA request after last transfer (multi-ADC mode) ******************/
ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable ADC2 */
ADC_Cmd(ADC2, ENABLE);
}
/*******************************************************************************
* Function Name : adc_init
* Description :
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void adc_init(void)
{
ADC12_Init();
TIM3_Config();
}
/*******************************************************************************
* Function Name : DMA2_Stream0_IRQHandler
* Description :
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void DMA2_Stream0_IRQHandler(void)
{
if(DMA_GetITStatus(DMA2_Stream0, DMA_IT_TCIF0))
{
TIM_Cmd(TIM3, DISABLE);
SampleSuccessFlag = 1;
}
}解释-----------------------------
调用函数adc_init后，将开始采样，当采样完ADC12_BUFFER_SIZE(16380)个点后，进入DMA2_Stream0_IRQHandler中断函数，然后失能定时器3也就停止采样了，将采样成功标志位SampleSuccessFlag置1，我们可以在主函数while循环中判断SampleSuccessFlag是否为1，为1后就可以对采样值ADC12ConvertedValue[ADC12_BUFFER_SIZE]进行相应的处理了。若要再次采样，调用TIM_Cmd(TIM3, ENABLE)即可。
这是我们使用wpf做的上位机软件，显示采样到的双通道波形：
