1.硬件

• STM32單片機(jī)最小系統(tǒng)
• 按鍵模塊

2.軟件

• 定時(shí)器HAL驅(qū)動(dòng)層文件添加
• ic驅(qū)動(dòng)文件添加
• GPIO常用函數(shù)
• 定時(shí)器輸入捕獲實(shí)驗(yàn)配置步驟
• main.c程序

#include "sys.h"
#include "delay.h"
#include "led.h"
#include "uart1.h"
#include "ic.h"int main(void)
{HAL_Init();                         /* 初始化HAL庫 */stm32_clock_init(RCC_PLL_MUL9);     /* 設(shè)置時(shí)鐘, 72Mhz */led_init();                         /* 初始化LED燈 */uart1_init(115200);printf("hello world!\r\n");ic_init(65536 - 1, 72 - 1);//計(jì)時(shí)1uswhile(1){ led1_on();led2_off();delay_ms(500);led1_off();led2_on();delay_ms(500);}
}

• **ic_init(65536 - 1, 72 - 1);//計(jì)時(shí)1us**語句定時(shí)參考

• ic.c程序

#include "ic.h"
#include "stdio.h"TIM_HandleTypeDef ic_handle = {0};
void ic_init(uint16_t arr, uint16_t psc)
{TIM_IC_InitTypeDef ic_config = {0};ic_handle.Instance = TIM2;ic_handle.Init.Prescaler = psc;ic_handle.Init.Period = arr;ic_handle.Init.CounterMode = TIM_COUNTERMODE_UP;HAL_TIM_IC_Init(&ic_handle);ic_config.ICPolarity = TIM_ICPOLARITY_FALLING;ic_config.ICSelection = TIM_ICSELECTION_DIRECTTI;ic_config.ICPrescaler = TIM_ICPSC_DIV1;ic_config.ICFilter = 0;HAL_TIM_IC_ConfigChannel(&ic_handle, &ic_config, TIM_CHANNEL_2);__HAL_TIM_ENABLE_IT(&ic_handle, TIM_IT_UPDATE);HAL_TIM_IC_Start_IT(&ic_handle, TIM_CHANNEL_2);
}void HAL_TIM_IC_MspInit(TIM_HandleTypeDef *htim)
{if(htim->Instance == TIM2){GPIO_InitTypeDef gpio_initstruct;//打開時(shí)鐘__HAL_RCC_GPIOA_CLK_ENABLE();                           // 使能GPIOA時(shí)鐘__HAL_RCC_TIM2_CLK_ENABLE();//調(diào)用GPIO初始化函數(shù)gpio_initstruct.Pin = GPIO_PIN_0;                    // PA0gpio_initstruct.Mode = GPIO_MODE_AF_PP;             // 推挽輸出gpio_initstruct.Pull = GPIO_PULLUP;                     // 上拉gpio_initstruct.Speed = GPIO_SPEED_FREQ_HIGH;           // 高速HAL_GPIO_Init(GPIOB, &gpio_initstruct);HAL_NVIC_SetPriority(TIM2_IRQn, 2, 2);HAL_NVIC_EnableIRQ(TIM2_IRQn);}
}void TIM2_IRQHandler(void)
{HAL_TIM_IRQHandler(&ic_handle);
}void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{printf("捕獲到下降沿\r\n");
}

• ic.h程序

#ifndef __IC_H__
#define __IC_H__#include "sys.h"
void ic_init(uint16_t arr, uint16_t psc);#endif

3.實(shí)物效果

• 硬件模塊接線
  KEY一端—>PA0
  KEY另一端—>GND
  ST-Link下載方式
  打開串口軟件，當(dāng)按鍵按下時(shí)，串口打印輸出“捕獲到下降沿”

實(shí)現(xiàn)捕獲功能keil源文件