stm32多设备ADC转换实例

以下是一个基于STM32F4xx系列微控制器的多设备ADC转换的示例代码：

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

#define ADC1_DR_ADDRESS ((uint32_t)0x4001204C)
#define ADC2_DR_ADDRESS ((uint32_t)0x4001214C)

__IO uint16_t ADC1ConvertedValues[2];
__IO uint16_t ADC2ConvertedValues[2];

void ADC_Config(void)
{
    ADC_InitTypeDef ADC_InitStructure;
    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    DMA_InitTypeDef DMA_InitStructure;

    // 使能ADC1和ADC2时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2, ENABLE);
    // 使能DMA2时钟
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

    // ADC1和ADC2共用的配置
    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配置
    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode = ENABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 2;
    ADC_Init(ADC1, &ADC_InitStructure);

    // ADC2配置
    ADC_InitStructure.ADC_NbrOfConversion = 1;
    ADC_Init(ADC2, &ADC_InitStructure);

    // DMA2配置
    DMA_InitStructure.DMA_Channel = DMA_Channel_0;
    DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_ADDRESS;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADC1ConvertedValues;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize = 2;
    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_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(DMA2_Stream0, &DMA_InitStructure);

    // ADC1和ADC2启动DMA转换
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
    ADC_DMARequestAfterLastTransferCmd(ADC2, ENABLE);
    ADC_DMACmd(ADC1, ENABLE);
    ADC_DMACmd(ADC2, ENABLE);

    // 启动DMA转换
    DMA_Cmd(DMA2_Stream0, ENABLE);

    // 启动ADC转换
    ADC_Cmd(ADC1, ENABLE);
    ADC_Cmd(ADC2, ENABLE);
    ADC_SoftwareStartConv(ADC1);
}

int main(void)
{
    ADC_Config();

    while (1)
    {
        // 从ADC1转换结果缓冲区读取数据
        uint16_t adc1_ch0 = ADC1ConvertedValues[0];
        uint16_t adc1_ch1 = ADC1ConvertedValues[1];

        // 从ADC2转换结果缓冲区读取数据
        uint16_t adc2_ch0 = ADC2ConvertedValues[0];

        // 处理数据
        ...
    }
}

在这个示例中，我们使用了ADC1和ADC2两个模块，每个模块都配置了独立的转换序列。我们使用了DMA将每个模块的转换结果存储到不同的缓冲区中。在主函数中，我们可以从缓冲区中读取数据，并进行后续处理。需要注意的是，为了避免DMA转换过程中的数据覆盖，我们使用了循环模式的DMA。同时，我们还需要根据具体的硬件和软件环境修改代码中的寄存器地址和配置参数。