ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;解释这句代码

这句代码是配置ADC的外部触发源，其中ADC_ExternalTrigConv是ADC的外部触发枚举类型，ADC_ExternalTrigConv_T1_CC1表示使用定时器1的捕获比较通道1作为ADC的外部触发源。

具体地说，当使用定时器1的捕获比较通道1作为ADC的外部触发源时，当定时器1的计数器值等于捕获比较通道1的CCR1寄存器值时，ADC会开始转换。这种配置通常用于通过定时器触发ADC转换来实现精确的采样时间控制。

相关问题

stm32adc采集dac的数据_STM32实例DAC数模转换实验

好的，以下是一个简单的STM32实例DAC数模转换实验，采用ADC采集DAC输出的数据。

首先，我们需要初始化DAC和ADC，以及配置ADC的DMA传输。

#include "stm32f4xx.h"

#define ADC_DR_ADDRESS    ((uint32_t)0x4001204C)

void DAC_ADC_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    DAC_InitTypeDef  DAC_InitStructure;
    ADC_InitTypeDef  ADC_InitStructure;
    DMA_InitTypeDef  DMA_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    /* Enable GPIOA clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    /* Configure PA4 (DAC1) in analog mode */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Enable DAC clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
    /* Configure DAC */
    DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
    DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
    DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
    DAC_Init(DAC_Channel_1, &DAC_InitStructure);
    /* Enable DAC Channel1 */
    DAC_Cmd(DAC_Channel_1, ENABLE);

    /* Enable ADC1 clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    /* Configure PA5 (ADC1 Channel 5) in analog mode */
    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);

    /* Configure ADC1 */
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);
    /* ADC1 regular channel5 configuration */
    ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_480Cycles);

    /* Enable DMA1 clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
    /* DMA1 Stream0 channel0 configuration */
    DMA_InitStructure.DMA_Channel = DMA_Channel_0;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_DR_ADDRESS;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) &ADCConvertedValue;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize = 1;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
    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_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(DMA1_Stream0, &DMA_InitStructure);
    /* Enable DMA1 Stream0 */
    DMA_Cmd(DMA1_Stream0, ENABLE);

    /* Enable ADC1 DMA */
    ADC_DMACmd(ADC1, ENABLE);

    /* Enable ADC1 */
    ADC_Cmd(ADC1, ENABLE);

    /* Enable ADC1 reset calibration register */   
    ADC_ResetCalibration(ADC1);
    while(ADC_GetResetCalibrationStatus(ADC1));

    /* Start ADC1 calibration */
    ADC_StartCalibration(ADC1);
    while(ADC_GetCalibrationStatus(ADC1));
}

然后，我们需要编写一个函数来设置DAC输出的电压值。

void Set_DAC_Voltage(uint16_t value)
{
    DAC_SetChannel1Data(DAC_Align_12b_R, value);
    DAC_SoftwareTriggerCmd(DAC_Channel_1, ENABLE);
}

最后，我们可以编写一个函数来读取ADC采集到的DAC输出的电压值。

uint16_t Get_ADC_Voltage(void)
{
    return ADCConvertedValue;
}

我们可以在主函数中调用这些函数来进行实验。

int main(void)
{
    DAC_ADC_Init();

    while (1)
    {
        Set_DAC_Voltage(2048);
        uint16_t adc_value = Get_ADC_Voltage();
        // 处理采集到的ADC数值
    }
}

这样，我们就可以进行STM32实例DAC数模转换实验了。

DMA1_Channel1_IRQn 具体的使用代码

好的，以下是一个使用 DMA1_Channel1_IRQn 中断的 STM32F4 程序的代码示例，主要实现了从 ADC1 数据寄存器中读取采样数据，通过 DMA1 传输到内存中，并在传输完成时通过 DMA1_Channel1_IRQHandler 中断进行处理：

#include "stm32f4xx.h"
#include "stm32f4xx_dma.h"
#include "stm32f4xx_adc.h"

#define ADC1_DR_ADDRESS ((uint32_t)0x4001204C)
#define ADC1_CHANNEL 0

volatile uint16_t ADCValue;

void DMA_Configuration(void)
{
    DMA_InitTypeDef DMA_InitStructure;
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);

    DMA_DeInit(DMA1_Stream0);

    DMA_InitStructure.DMA_Channel = DMA_Channel_0;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCValue;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize = 1;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
    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_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(DMA1_Stream0, &DMA_InitStructure);

    DMA_Cmd(DMA1_Stream0, ENABLE);
}

void ADC_Configuration(void)
{
    ADC_InitTypeDef ADC_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
    ADC_CommonInit(&ADC_CommonInitStructure);

    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(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_15Cycles);

    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

    ADC_DMACmd(ADC1, ENABLE);

    ADC_Cmd(ADC1, ENABLE);

    ADC_SoftwareStartConv(ADC1);
}

void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void DMA1_Channel1_IRQHandler(void)
{
    if(DMA_GetFlagStatus(DMA1_Stream0, DMA_FLAG_TCIF0) != RESET)
    {
        DMA_ClearFlag(DMA1_Stream0, DMA_FLAG_TCIF0);
        ADC_SoftwareStartConv(ADC1);
        // 处理采样数据
    }
}

int main(void)
{
    DMA_Configuration();
    ADC_Configuration();
    NVIC_Configuration();

    while(1);
}

这份代码主要完成了以下工作：

1. 配置 ADC1 和 GPIOA0，设置采样通道和采样时间；
2. 配置 DMA1_Stream0，将 ADC1 的 DR 寄存器的值传输到 ADCValue 变量中；
3. 配置 DMA1_Channel1_IRQn 中断，设置优先级，并在传输完成时进行处理。

在程序中，ADC_SoftwareStartConv 函数用于启动 ADC1 的转换，将采样数据传输到 ADCValue 变量中，当 DMA1_Stream0 传输完成时，会触发 DMA1_Channel1_IRQHandler 中断，我们可以在此中断服务函数中进行采样数据的处理。