stm32f0模数转换
时间: 2023-10-13 21:06:37 浏览: 31
STM32F0系列微控制器内置了一些模数转换器(ADC)用于模拟量的转换,以下是一个简单的示例代码:
```c
#include "stm32f0xx.h"
/* 定义ADC通道 */
#define ADC_CHANNEL 0
/* 定义ADC采样次数 */
#define ADC_SAMPLE_NUM 16
uint16_t ADCConvertedValue[ADC_SAMPLE_NUM];
int main(void)
{
/* 启用GPIOA时钟 */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* 启用ADC时钟 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* 配置PA0引脚为模拟输入 */
GPIO_InitTypeDef GPIO_InitStructure;
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);
/* 配置ADC */
ADC_InitTypeDef ADC_InitStructure;
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_TRGO;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_Init(ADC1, &ADC_InitStructure);
/* 配置ADC通道 */
ADC_ChannelConfig(ADC1, ADC_CHANNEL, ADC_SampleTime_239_5Cycles);
/* 启用DMA */
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = ADC_SAMPLE_NUM;
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_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* 启动DMA */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* 启动ADC */
ADC_Cmd(ADC1, ENABLE);
/* 等待ADC初始化完成 */
while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));
/* 启动ADC DMA模式 */
ADC_DMACmd(ADC1, ENABLE);
while (1)
{
/* 计算采样值平均值 */
uint32_t sum = 0;
for (int i = 0; i < ADC_SAMPLE_NUM; i++)
{
sum += ADCConvertedValue[i];
}
uint16_t average = sum / ADC_SAMPLE_NUM;
/* 等待下一次采样 */
while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
ADC_ClearFlag(ADC1, ADC_FLAG_EOC);
}
}
```
该代码使用了ADC和DMA模块,实现了连续采样并使用DMA传输数据的功能。在上面的代码中,我们先启用GPIOA和ADC的时钟,然后配置PA0引脚为模拟输入,接着配置ADC模块,并启用DMA模块。在主循环中,我们使用DMA传输的数据计算采样值的平均值,并等待下一次采样。
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