[技术问答] 新手求助M031关于定时器计数中断问题

#include <stdio.h>

#include "NuMicro.h"





void TMR0_IRQHandler(void)

{

//  printf("Count 1000 falling events! Test complete !\n");

    TIMER_ClearIntFlag(TIMER0);

}



void SYS_Init(void)

{

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable HIRC */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Switch HCLK clock source to HIRC */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Set both PCLK0 and PCLK1 as HCLK/2 */

    CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2);



    /* Switch UART0 clock source to HIRC */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));



    /* Enable UART peripheral clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Enable IP clock */

    CLK_EnableModuleClock(TMR0_MODULE);



    /* Select IP clock source */

    CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0SEL_HIRC, 0);



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */

    SystemCoreClockUpdate();



    /*----------------------------------------------------------------------*/

    /* Init I/O Multi-function                                              */

    /*----------------------------------------------------------------------*/

    /* Set GPB multi-function pins for UART0 RXD and TXD */

    SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk)) |

                    (SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);



    /* Set timer event counting pin */

//    SYS->GPB_MFPL = (SYS->GPB_MFPL & ~(SYS_GPB_MFPL_PB5MFP_Msk)) |

//                    (SYS_GPB_MFPL_PB5MFP_TM0);



    /* Lock protected registers */

    SYS_LockReg();

}



/*----------------------------------------------------------------------*/

/* Init UART0                                                           */

/*----------------------------------------------------------------------*/

void UART0_Init(void)

{

    /* Reset UART0 */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 baud rate */

    UART_Open(UART0, 115200);

}



int main(void)

{

    int i;



    /* Init System, IP clock and multi-function I/O. */

    SYS_Init();



    /* Init UART0 for printf */

    UART0_Init();



    printf("\nThis sample code use TM0 (PB.5) to count PB.4 input event\n");

    printf("Please connect PB.5 to PB.4, press any key to continue\n");





//    PB4 = 0;    /* Set init state to high */

//    GPIO_SetMode(PB, BIT4, GPIO_MODE_OUTPUT);

          GPIO_SetMode(PB, BIT14, GPIO_MODE_OUTPUT);



    /* Give a dummy target frequency here. Will over write prescale and compare value with macro */

    TIMER_Open(TIMER0, TIMER_ONESHOT_MODE, 1);



    /* Update prescale and compare value to what we need in event counter mode. */

    TIMER_SET_PRESCALE_VALUE(TIMER0, 0);

    TIMER_SET_CMP_VALUE(TIMER0, 56789);

    /* Counter increase on falling edge */

//    TIMER_EnableEventCounter(TIMER0, TIMER_COUNTER_FALLING_EDGE);

    /* Start Timer 0 */

    TIMER_Start(TIMER0);

    /* Enable timer interrupt */

    TIMER_EnableInt(TIMER0);

    NVIC_EnableIRQ(TMR0_IRQn);     

                

                if(TIMER_GetCounter(TIMER0) == 56789)

                {

                        for(i = 0; i < 10; i++)

                        {

                                PB14 ^= 1;

                        }

                }

    while(1);

                

}