可以写一个STM32输入捕获的例子吗
时间: 2023-05-22 13:05:41 浏览: 69
当然可以。以下是一个简单的示例代码,实现了STM32的输入捕获功能:
#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_tim.h"
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_ICInitTypeDef TIM_ICInitStruct;
// 使能GPIO时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置GPIO为输入模式
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
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_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置TIM时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// 配置TIM基本参数
TIM_TimeBaseInitStruct.TIM_Period = 1000 - 1; // 计数器周期为1000
TIM_TimeBaseInitStruct.TIM_Prescaler = 42000 - 1; // 时钟预分频为42000
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
// 配置TIM输入捕获通道
TIM_ICInitStruct.TIM_Channel = TIM_Channel_1;
TIM_ICInitStruct.TIM_ICPolarity = TIM_ICPolarity_Rising; // 上升沿触发
TIM_ICInitStruct.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStruct.TIM_ICPrescaler = TIM_ICPSC_DIV1; // 输入分频为1
TIM_ICInitStruct.TIM_ICFilter = 0x0F;
TIM_ICInit(TIM2, &TIM_ICInitStruct);
// 使能TIM
TIM_Cmd(TIM2, ENABLE);
while (1)
{
// 等待捕获事件发生
while (TIM_GetFlagStatus(TIM2, TIM_FLAG_CC1) == RESET);
// 清除捕获事件标志
TIM_ClearFlag(TIM2, TIM_FLAG_CC1);
// 获取捕获值
uint16_t capture_value = TIM_GetCapture1(TIM2);
// 处理捕获值
// ...
}
}
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