GD32入门到实战21--输入捕获

我们新建capture_drv.c

#include <stdint.h>
#include <stdio.h>
#include "gd32f30x.h"
#include "delay.h"

static void GpioInit(void) 
{
    rcu_periph_clock_enable(RCU_GPIOA);
    gpio_init(GPIOA,GPIO_MODE_IN_FLOATING,GPIO_OSPEED_10MHZ,GPIO_PIN_0);
}

static void TimerInit()
{
    timer_parameter_struct timerInitPara;
    timer_struct_para_init(&timerInitPara);//给定时器结构体赋初值
    
    /*使能定时器时钟*/
    rcu_periph_clock_enable(RCU_TIMER1);
    /*复位定时器*/
    timer_deinit(TIMER1);
    /*设置预分频值*/
    timerInitPara.prescaler = 120 - 1;//时钟频率为1Mhz，周期为1us
    /*设置自动重装载值*/
    timerInitPara.period = 65535;
    /*初始化定时器*/
    timer_init(TIMER1,&timerInitPara);//给定时器结构体赋初值
    
    timer_ic_parameter_struct icInitPara;
    timer_channel_input_struct_para_init(&icInitPara);
    /*设置上升沿/下降沿捕获*/
    icInitPara.icpolarity = TIMER_IC_POLARITY_RISING;
    /*设置输入通道*/
    icInitPara.icselection = TIMER_IC_SELECTION_DIRECTTI;
    timer_input_capture_config(TIMER1,TIMER_CH_0,&icInitPara);
    /*使能定时器的捕获中断*/
    timer_interrupt_flag_clear(TIMER1 ,TIMER_INT_FLAG_CH0);//清除中断标志位
    timer_interrupt_enable(TIMER1,TIMER_INT_CH0);
    /*使能定时器中断优先级*/
    nvic_irq_enable(TIMER1_IRQn, 0, 0);
    /*使能定时器*/
    timer_enable(TIMER1);
}


static uint32_t g_icValue;//1 = 1us
void TIMER1_IRQHandler()
{
    if(timer_interrupt_flag_get(TIMER1 , TIMER_INT_FLAG_CH0) == SET)//判断是否产生中断
    {
        timer_interrupt_flag_clear(TIMER1 , TIMER_INT_FLAG_CH0);//清除中断标志位
        g_icValue = timer_channel_capture_value_register_read(TIMER1, TIMER_CH_0) + 1;//读取计数值
        timer_counter_value_config(TIMER1 , 0);//计数器清零
    }
}

void CaptureDrvInit()
{
    GpioInit();
    TimerInit();
}

void CaptunreDrvTest(void)//测试函数
{
    printf("period is %d us.\n",g_icValue);
    DelayNms(500);
}

capture_drv.h

#ifndef _CAPTURE_DRV_H_
#define _CAPTURE_DRV_H_


void CaptureDrvInit();
void CaptunreDrvTest(void);//测试函数

#endif