编写一段使用stm32获取一段正弦波峰峰值的代码
时间: 2024-01-14 08:04:49 浏览: 50
以下是一个示例代码,用于获取ADC采集到的正弦波峰峰值:
```c
#include "stm32f4xx.h"
#define SAMPLES 1000 // 采样数
#define VREF 3.3 // 参考电压
uint16_t ADCBuffer[SAMPLES]; // ADC数据缓存
int main(void)
{
// 初始化ADC
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_InitTypeDef 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_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Cmd(ADC1, ENABLE);
// 初始化GPIO
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
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);
// 开始ADC转换
ADC_SoftwareStartConv(ADC1);
// 等待转换完成
while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
// 获取ADC采集到的数据
for (int i = 0; i < SAMPLES; i++) {
ADCBuffer[i] = ADC_GetConversionValue(ADC1);
ADC_SoftwareStartConv(ADC1);
while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
}
// 计算正弦波峰峰值
uint16_t max = 0;
uint16_t min = 4096;
for (int i = 0; i < SAMPLES; i++) {
if (ADCBuffer[i] > max) {
max = ADCBuffer[i];
}
if (ADCBuffer[i] < min) {
min = ADCBuffer[i];
}
}
float Vpp = (max - min) * VREF / 4096;
while (1);
}
```
该代码假设ADC的输入引脚为PA0,输入的正弦波已经被采样并存储在ADCBuffer数组中。代码使用循环来获取ADC采集到的数据,然后计算出正弦波的峰峰值。