M051系列定时器捕获例子说明

/**************************************************************************//**

* [url=home.php?mod=space&uid=288409]@file[/url]     main.c

* [url=home.php?mod=space&uid=895143]@version[/url]  V3.00

* $Revision: 3 $

* $Date: 15/02/06 10:22a $

* [url=home.php?mod=space&uid=247401]@brief[/url]    Show how to use the timer1 capture function to capture timer1 counter value.

* @note

* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.

******************************************************************************/

#include <stdio.h>

#include "M058S.h"



#define PLL_CLOCK           50000000





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

/* Global Interface Variables Declarations                                                                 */

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

volatile uint32_t g_au32TMRINTCount[4] = {0};





/**

* [url=home.php?mod=space&uid=247401]@brief[/url]       Timer0 IRQ

*

* @param       None

*

* [url=home.php?mod=space&uid=266161]@return[/url]      None

*

* [url=home.php?mod=space&uid=1543424]@Details[/url]     The Timer0 default IRQ, declared in startup_M058S.s.

*/

void TMR0_IRQHandler(void)

{

    /* Clear Timer0 time-out interrupt flag */

    TIMER_ClearIntFlag(TIMER0);



    g_au32TMRINTCount[0]++;

}



/**

* @brief       Timer1 IRQ

*

* @param       None

*

* [url=home.php?mod=space&uid=266161]@return[/url]      None

*

* @details     The Timer1 default IRQ, declared in startup_M058S.s.

*/

void TMR1_IRQHandler(void)

{

    if(TIMER_GetCaptureIntFlag(TIMER1) == 1)

    {

        /* Clear Timer1 capture interrupt flag */

        TIMER_ClearCaptureIntFlag(TIMER1);



        g_au32TMRINTCount[1]++;

    }

}



/**

* @brief       Timer2 IRQ

*

* @param       None

*

* @return      None

*

* @details     The Timer2 default IRQ, declared in startup_M058S.s.

*/

void TMR2_IRQHandler(void)

{

    /* Clear Timer2 time-out interrupt flag */

    TIMER_GetIntFlag(TIMER2);



    g_au32TMRINTCount[2]++;

}



/**

* @brief       Timer3 IRQ

*

* @param       None

*

* @return      None

*

* @details     The Timer3 default IRQ, declared in startup_M058S.s.

*/

void TMR3_IRQHandler(void)

{

    /* Clear Timer3 time-out interrupt flag */

    TIMER_GetIntFlag(TIMER3);



    g_au32TMRINTCount[3]++;

}



void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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

    /* Enable HIRC 22.1184MHz clock */

    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);



    /* Switch HCLK clock source to HIRC and HCLK source divide 1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));



    /* Enable external XTAL 12MHz clock */

    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);



    /* Waiting for external XTAL clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);



    /* Set core clock as PLL_CLOCK from PLL */

    CLK_SetCoreClock(PLL_CLOCK);



    /* Enable peripheral clock */

    CLK_EnableModuleClock(UART0_MODULE);

    CLK_EnableModuleClock(TMR0_MODULE);

    CLK_EnableModuleClock(TMR1_MODULE);

    CLK_EnableModuleClock(TMR3_MODULE);



    /* Peripheral clock source */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));

    CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0_S_HXT, 0);

    CLK_SetModuleClock(TMR1_MODULE, CLK_CLKSEL1_TMR1_S_HCLK, 0);

    CLK_SetModuleClock(TMR3_MODULE, CLK_CLKSEL1_TMR3_S_HXT, 0);



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

    /* Init I/O Multi-function                                                                                 */

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

    /* Set P3 multi-function pins for UART0 RXD, TXD, T0, T1 and T1EX */

    SYS->P3_MFP = SYS_MFP_P30_RXD | SYS_MFP_P31_TXD | SYS_MFP_P34_T0 | SYS_MFP_P35_T1 | SYS_MFP_P33_T1EX;



    /* Set P1 multi-function pins for T3 */

    SYS->P1_MFP = SYS_MFP_P11_T3;

}



void UART0_Init(void)

{

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

    /* Init UART                                                                                               */

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

    /* Reset IP */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 Baudrate */

    UART_Open(UART0, 115200);

}



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

/*  MAIN function                                                                                          */

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

int main(void)

{

    volatile uint32_t u32InitCount;



    /* Unlock protected registers */

    SYS_UnlockReg();



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

    SYS_Init();



    /* Init UART0 for printf */

    UART0_Init();



    printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);

    printf("+---------------------------------------------------+\n");

    printf("|    Timer External Capture Function Sample Code    |\n");

    printf("+---------------------------------------------------+\n\n");



    printf("# Timer Settings:\n");

    printf("  Timer0: Clock source is 12 MHz; Toggle-output mode and frequency is 500 Hz.\n");

    printf("  Timer3: Clock source is 12 MHz; Toggle-output mode and frequency is 1 Hz.\n");

    printf("  Timer1: Clock source is HCLK(50 MHz); Continuous counting mode; TCMP is 0xFFFFFF;\n");

    printf("          Counter pin enable; Capture pin and capture interrupt enable;\n");

    printf("# Generate 500 Hz frequency from T0 and connect T0 pin to Timer1 counter pin.\n");

    printf("# Generate 1 Hz frequency from T3 and connect T3 pin to T1EX capture pin.\n");

    printf("# Get 500 event counts from Timer1 counter pin when each T1EX pin interrupt occurred.\n\n");



    /* Initial Timer0 and Timer3 default setting */

    TIMER_Open(TIMER0, TIMER_TOGGLE_MODE, 1000);

    TIMER_Open(TIMER3, TIMER_TOGGLE_MODE, 2);



    /* Initial Timer1 default setting */

    TIMER_Open(TIMER1, TIMER_CONTINUOUS_MODE, 1);



    /* Configure Timer1 setting for external counter input and capture function */

    TIMER_SET_PRESCALE_VALUE(TIMER1, 0);//设置定时器1的分频为0，就是不分频。

    TIMER_SET_CMP_VALUE(TIMER1, 0xFFFFFF); //设置比较器的值为计数器满量程（24位的计数器）

    TIMER_EnableEventCounter(TIMER1, TIMER_COUNTER_FALLING_EDGE); //使能定时器为计数器下降沿计数

    TIMER_EnableCapture(TIMER1, TIMER_CAPTURE_FREE_COUNTING_MODE, TIMER_CAPTURE_FALLING_EDGE);//使能捕捉器

    TIMER_EnableCaptureInt(TIMER1); //使能捕捉中断



    /* Enable Timer1 NVIC */

    NVIC_EnableIRQ(TMR1_IRQn);



    /* Clear Timer1 interrupt counts to 0 */

    u32InitCount = g_au32TMRINTCount[1] = 0;



    /* Start Timer0, Timer1 and Timer3 counting */

    TIMER_Start(TIMER0);

    TIMER_Start(TIMER1);

    TIMER_Start(TIMER3);



    /* Check T1EX interrupt counts。 */

    while(g_au32TMRINTCount[1] <= 10)

    {

        if(g_au32TMRINTCount[1] != u32InitCount)

        {

            printf("[%2d] - %4d\n", g_au32TMRINTCount[1], TIMER_GetCaptureData(TIMER1));//这里就是给出了计数周期数和捕获的值，加起来就是捕获的信号周期

            u32InitCount = g_au32TMRINTCount[1];

        }

    }



    /* Stop Timer0, Timer1 and Timer3 counting */

    TIMER_Close(TIMER0);

    TIMER_Close(TIMER1);

    TIMER_Close(TIMER3);



    printf("*** PASS ***\n");



    while(1);

}



/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/