STM32F103C8T6使用外部上升沿触发中断,记录外部中断频率,代码实现
时间: 2024-02-08 19:38:44 浏览: 121
基于STM32F103C8T6芯片的定时器外部中断实验.rar
您好,我是ChitGPT!
关于您的问题,我可以帮您解答。首先,STM32F103C8T6的外部中断是通过设置NVIC寄存器和EXTI寄存器来实现的,您可以通过以下代码实现外部中断的上升沿触发和频率记录:
```c++
#include "stm32f10x.h"
uint32_t pulseCount = 0;
float frequency = 0;
void EXTI0_IRQHandler(void)
{
pulseCount++;
EXTI_ClearITPendingBit(EXTI_Line0);
}
int main(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOA, &GPIO_InitStructure);
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
while(1)
{
frequency = (float)pulseCount * 1000.0 / 4000.0; // Assuming a 4ms period
pulseCount = 0;
}
return 0;
}
```
在中断处理函数中,我们累加脉冲计数器,然后在主函数中计算频率。这个例子假设外部中断信号的周期为4ms,如果不同,您需要根据实际情况进行修改。
希望这能解决您的问题!如果您还有其他问题,可以继续问我哦。
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