GD32F3x0_Firmware_Library/Examples/TIMER/TIMER2_inputcapture/gd32f3x0_it.c

/*!
    \file  gd32f3x0_it.c
    \brief interrupt service routines
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-06-06, V1.0.0, firmware for GD32F3x0
*/

#include "gd32f3x0_it.h"
#include <stdio.h>

uint16_t readvalue1 = 0, readvalue2 = 0;
__IO uint16_t ccnumber = 0;
__IO uint32_t count = 0;
__IO float fre = 0;

/*!
    \brief      this function handles NMI exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void NMI_Handler(void)
{
}

/*!
    \brief      this function handles HardFault exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void HardFault_Handler(void)
{
    /* if Hard Fault exception occurs, go to infinite loop */
    while (1);
}

/*!
    \brief      this function handles MemManage exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void MemManage_Handler(void)
{
    /* if Memory Manage exception occurs, go to infinite loop */
    while (1);
}

/*!
    \brief      this function handles BusFault exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void BusFault_Handler(void)
{
    /* if Bus Fault exception occurs, go to infinite loop */
    while (1);
}

/*!
    \brief      this function handles UsageFault exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void UsageFault_Handler(void)
{
    /* if Usage Fault exception occurs, go to infinite loop */
    while (1);
}

/*!
    \brief      this function handles SVC exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void SVC_Handler(void)
{
}

/*!
    \brief      this function handles DebugMon exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void DebugMon_Handler(void)
{
}

/*!
    \brief      this function handles PendSV exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void PendSV_Handler(void)
{
}

/*!
    \brief      this function handles SysTick exception
    \param[in]  none
    \param[out] none
    \retval     none
*/
void SysTick_Handler(void)
{
}

/*!
    \brief      this function handles TIMER2 interrupt request
    \param[in]  none
    \param[out] none
    \retval     none
*/
void TIMER2_IRQHandler(void)
{
    if(SET == timer_interrupt_flag_get(TIMER2,TIMER_INT_FLAG_CH0)){
        /* clear channel 0 interrupt bit */
        timer_interrupt_flag_clear(TIMER2,TIMER_INT_FLAG_CH0);

        if(0 == ccnumber){
            /* read channel 0 capture value */
            readvalue1 = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_0);
            ccnumber = 1;
        }else if(1 == ccnumber){
            /* read channel 0 capture value */
            readvalue2 = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_0);

            if(readvalue2 > readvalue1){
                count = (readvalue2 - readvalue1); 
            }else{
                count = ((0xFFFF - readvalue1) + readvalue2); 
            }

            fre = (float)2000 / count;
            printf("the value1 is %d,the value2 is %d\n",readvalue1,readvalue2);
            printf("the count is %d\n",count);
            printf("the frequence is %f\n",fre);
            ccnumber = 0;
        }
    }
}