用STM32F407写一个测量100Khz到1MHZ的正弦波频率的代码
时间: 2023-12-07 21:39:44 浏览: 228
要测量100KHz到1MHz范围内的正弦波频率,您可以使用STM32F407的定时器和输入捕获功能。以下是一个示例代码:
```c
#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_tim.h"
#define TIMER_FREQUENCY 100000000 // 定时器频率 (Hz)
uint32_t captureValue1 = 0;
uint32_t captureValue2 = 0;
uint32_t frequency = 0;
void TIM_Configuration(void);
void GPIO_Configuration(void);
int main(void) {
GPIO_Configuration();
TIM_Configuration();
while (1) {
// 等待第一个捕获事件
while (!(TIM_GetFlagStatus(TIM2, TIM_FLAG_CC1) == SET)) {}
captureValue1 = TIM_GetCapture1(TIM2);
// 等待第二个捕获事件
while (!(TIM_GetFlagStatus(TIM2, TIM_FLAG_CC2) == SET)) {}
captureValue2 = TIM_GetCapture2(TIM2);
// 计算频率
if (captureValue2 > captureValue1) {
frequency = TIMER_FREQUENCY / (captureValue2 - captureValue1);
} else {
frequency = 0;
}
// 将频率发送到串口或其他操作
// 清除标志位
TIM_ClearFlag(TIM2, TIM_FLAG_CC1 | TIM_FLAG_CC2);
}
}
void TIM_Configuration(void) {
TIM_ICInitTypeDef TIM_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// 使能定时器时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// 定时器配置
TIM_DeInit(TIM2);
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);
// 配置输入捕获通道2
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);
// 配置定时器时钟分频
TIM_PrescalerConfig(TIM2, 0, 0);
// 配置定时器自动重装载寄存器
TIM_SetAutoreload(TIM2, 0xFFFF);
// 使能定时器输入捕获
TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1);
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
// 清除标志位
TIM_ClearFlag(TIM2, TIM_FLAG_CC1 | TIM_FLAG_CC2);
// 使能输入捕获中断
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 使能定时器
TIM_Cmd(TIM2, ENABLE);
}
void GPIO_Configuration(void) {
GPIO_InitTypeDef GPIO_InitStructure;
// 使能GPIO时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置GPIO为复用功能
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置GPIO引脚复用到定时器
GPIO_PinAFConfig(GPIOA, GPIO_PinSource15, GPIO_AF_TIM2);
}
void TIM2_IRQHandler(void) {
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) == SET) {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC2) == SET) {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);
}
}
```
您可以将频率发送到串口或者其他操作进行进一步处理或显示。此示例代码假设您已经正确配置了系统时钟和其他必要的设置。
请注意,输入捕获的精度受到定时器时钟频率和分频因子的影响,因此可能需要根据实际情况进行适当的调整。
希望对您有所帮助!如果您有任何其他问题,请随时提问。
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