[DemoCode下载] NUC123定时器捕获

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

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

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

 * $Revision: 5 $

 * $Date: 15/07/02 11:18a $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Demonstrate how to use timer2 capture event to capture timer2 counter value.

 * @note

 * Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.

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

#include <stdio.h>

#include "NUC123.h"



#define HCLK_CLOCK           72000000





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

/* Global Interface Variables Declarations                                                                 */

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

volatile uint32_t g_au32TMRINTCount[4] = {0};





/**

 * @brief       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_NUC123.s.

 */

void TMR0_IRQHandler(void)

{

    /* Clear Timer0 time-out interrupt flag */

    TIMER_ClearIntFlag(TIMER0);



    g_au32TMRINTCount[0]++;

}



/**

 * @brief       Timer1 IRQ

 *

 * @param       None

 *

 * @return      None

 *

 * @details     The Timer1 default IRQ, declared in startup_NUC123.s.

 */

void TMR1_IRQHandler(void)

{

    /* Clear Timer1 time-out interrupt flag */

    TIMER_GetIntFlag(TIMER1);



    g_au32TMRINTCount[1]++;

}



/**

 * @brief       Timer2 IRQ

 *

 * @param       None

 *

 * @return      None

 *

 * @details     The Timer2 default IRQ, declared in startup_NUC123.s.

 */

void TMR2_IRQHandler(void)

{

    if(TIMER_GetCaptureIntFlag(TIMER2) == 1)

    {

        /* Clear Timer2 capture interrupt flag */

        TIMER_ClearCaptureIntFlag(TIMER2);



        g_au32TMRINTCount[2]++;

    }

}



void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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

    /* Enable IRC22M clock */

    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);



    /* Waiting for IRC22M clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);



    /* Switch HCLK clock source to HIRC */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));



    /* Enable XT1_OUT(PF.0) and XT1_IN(PF.1) */

    SYS->GPF_MFP |= SYS_GPF_MFP_PF0_XT1_OUT | SYS_GPF_MFP_PF1_XT1_IN;



    /* Enable external 12 MHz XTAL */

    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);



    /* Waiting for clock ready */

    while(!CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk));



    /* Set core clock as HCLK_CLOCK */

    CLK_SetCoreClock(HCLK_CLOCK);



    /* Enable peripheral clock */

    CLK_EnableModuleClock(UART0_MODULE);

    CLK_EnableModuleClock(TMR0_MODULE);

    CLK_EnableModuleClock(TMR1_MODULE);

    CLK_EnableModuleClock(TMR2_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_HXT, 0);

    CLK_SetModuleClock(TMR2_MODULE, CLK_CLKSEL1_TMR2_S_HCLK, 0);



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

    /* Init I/O Multi-function                                                                                 */

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

    /* Set PB multi-function pins for UART0 RXD, TXD, TM0, TM1, TM2 and TM2_EXT */

    SYS->GPB_MFP = SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD |

                   SYS_GPB_MFP_PB8_TM0 | SYS_GPB_MFP_PB9_TM1 | SYS_GPB_MFP_PB10_TM2 |

                   SYS_GPB_MFP_PB2_TM2_EXT;



    SYS->ALT_MFP  = SYS_ALT_MFP_PB2_TM2_EXT;

}



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, u32TimeoutCount;

    uint32_t au32CAPValus[10];;



    /* Unlock protected registers */

    SYS_UnlockReg();



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

    SYS_Init();



    /* Lock protected registers */

    SYS_LockReg();



    /* 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("  Timer1: Clock source is 12 MHz; Toggle-output mode and frequency is 1 Hz.\n");

    printf("  Timer2: Clock source is HCLK(72 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 TM0(PB.8) and connect TM0 pin to Timer2 counter pin(PB.10).\n");

    printf("# Generate 1 Hz frequency from TM1(PB.9) and connect TM1 pin to TM2_EXT(PB.2) capture pin.\n");

    printf("# Get 500 event counts from Timer2 counter pin when each TM2_EXT pin interrupt occurred.\n\n");



    /* Initial Timer0 and Timer1 default setting */

    TIMER_Open(TIMER0, TIMER_TOGGLE_MODE, 1000);

    TIMER_Open(TIMER1, TIMER_TOGGLE_MODE, 2);



    /* Initial Timer2 default setting */

    TIMER_Open(TIMER2, TIMER_CONTINUOUS_MODE, 1);



    /* Configure Timer2 setting for external counter input and capture function */

    TIMER_SET_PRESCALE_VALUE(TIMER2, 0);

    TIMER_SET_CMP_VALUE(TIMER2, 0xFFFFFF);

    TIMER_EnableEventCounter(TIMER2, TIMER_COUNTER_FALLING_EDGE);

    TIMER_EnableCapture(TIMER2, TIMER_CAPTURE_FREE_COUNTING_MODE, TIMER_CAPTURE_FALLING_EDGE);

    TIMER_EnableCaptureInt(TIMER2);



    /* Enable Timer2 NVIC */

    NVIC_EnableIRQ(TMR2_IRQn);



    /* Clear Timer2 interrupt counts to 0 */

    u32InitCount = g_au32TMRINTCount[2] = 0;



    /* Start Timer0, Timer1 and Timer2 counting */

    TIMER_Start(TIMER0);

    TIMER_Start(TIMER1);

    TIMER_Start(TIMER2);



    /* Check TM2_EXT interrupt counts */

    u32TimeoutCount = 0;

    while(g_au32TMRINTCount[2] <= 10)

    {

        if(g_au32TMRINTCount[2] != u32InitCount)

        {

            u32TimeoutCount = 0;

            au32CAPValus[u32InitCount] = TIMER_GetCaptureData(TIMER2);

            printf("[%2d] - %4d\n", g_au32TMRINTCount[2], au32CAPValus[u32InitCount]);

            if(u32InitCount > 1)

            {

                if((au32CAPValus[u32InitCount] - au32CAPValus[u32InitCount - 1]) != 500)

                {

                    printf("*** FAIL ***\n");

                    while(1);

                }

            }

            u32InitCount = g_au32TMRINTCount[2];

        }



        if(u32TimeoutCount++ > SystemCoreClock / 2)

        {

            printf("Timer2 capture event time-out.\n");

            while(1);

        }

    }



    /* Stop Timer0, Timer1 and Timer2 counting */

    TIMER_Close(TIMER0);

    TIMER_Close(TIMER1);

    TIMER_Close(TIMER2);



    printf("*** PASS ***\n");



    while(1);

}



/*** (C) COPYRIGHT 2014~2015 Nuvoton Technology Corp. ***/