DMA+ADC C语言代码
时间: 2023-08-06 15:03:11 浏览: 182
以下是一个使用DMA和ADC的C语言代码示例,用于从ADC读取数据并使用DMA传输到内存:
```c
#include "stm32f4xx.h"
#define ADC_BUFFER_LENGTH 100
uint16_t adc_data[ADC_BUFFER_LENGTH];
void ADC_DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
// 使能DMA2和ADC1的时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
// 配置ADC引脚
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置DMA
DMA_StructInit(&DMA_InitStructure);
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&adc_data[0];
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = ADC_BUFFER_LENGTH;
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);
// 配置ADC
ADC_StructInit(&ADC_InitStructure);
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);
// 配置ADC通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);
// 使能DMA请求
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
// 使能DMA传输和ADC
DMA_Cmd(DMA2_Stream0, ENABLE);
ADC_Cmd(ADC1, ENABLE);
// 启动ADC转换
ADC_SoftwareStartConv(ADC1);
}
int main(void)
{
ADC_DMA_Configuration();
while(1)
{
// 处理ADC数据
for(int i = 0; i < ADC_BUFFER_LENGTH; i++)
{
printf("ADC Data: %d\n", adc_data[i]);
}
// 延时
for(int i = 0; i < 1000000; i++);
}
}
```
这段代码使用了STM32F4系列的微控制器,配置了ADC和DMA来实现从ADC读取数据并使用DMA传输到内存。在`ADC_DMA_Configuration`函数中,首先使能了DMA2和ADC1的时钟,并配置了相应的引脚。然后,配置了DMA和ADC的相关参数,包括DMA传输方向、缓冲区地址、ADC分辨率等。最后,使能了DMA请求、启动了DMA传输和ADC转换。
在`main`函数中,通过循环处理ADC数据,然后进行延时。可以根据自己的需求修改代码来处理ADC数据或进行其他操作。
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