STM32AD转换代码

以下是一个基本的STM32 ADC（模数转换器）代码示例：

#include "stm32f4xx.h"

int main(void)
{
    // 使能ADC1时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    // 初始化ADC1
    ADC_InitTypeDef ADC_InitStruct;
    ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStruct.ADC_ScanConvMode = DISABLE;
    ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
    ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStruct.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStruct);

    // 配置ADC1通道
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_15Cycles);

    // 使能ADC1 DMA
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

    // 配置DMA
    DMA_InitTypeDef DMA_InitStruct;
    DMA_InitStruct.DMA_Channel = DMA_Channel_0;
    DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
    DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)&ADC_Value;
    DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStruct.DMA_BufferSize = 1;
    DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Disable;
    DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStruct.DMA_Priority = DMA_Priority_High;
    DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream0, &DMA_InitStruct);

    // 使能DMA
    DMA_Cmd(DMA2_Stream0, ENABLE);

    // 启动ADC1转换
    ADC_Cmd(ADC1, ENABLE);
    ADC_SoftwareStartConv(ADC1);

    while (1)
    {
        // 这里可以处理ADC_Value的值
    }
}

其中，ADC_Value是一个用于存储ADC转换结果的变量。在上面的代码中，使用了DMA（直接存储访问）来读取ADC转换结果，这样可以大大减少CPU的负载。

需要注意的是，上面的代码只是一个基本的示例，实际应用中需要根据具体情况进行适当的修改。