NCU029定时器计数

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

 * [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: 14/01/28 11:45a $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    NUC029 Series Timer Driver Sample Code

 *

 * @note

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

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

#include <stdio.h>

#include "NUC029xAN.h"



#define PLLCON_SETTING      CLK_PLLCON_50MHz_HXT

#define PLL_CLOCK           50000000





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

/* Global Interface Variables Declarations                                                                 */

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

volatile uint32_t g_au32TMRINTCount[4] = {0};





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

/*  Create Counter Source by GPIO PORT2                                                                    */

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

void GeneratePORT2Counter(uint32_t u32Pin, uint32_t u32Counts)

{

    while(u32Counts--)

    {

        GPIO_PIN_ADDR(2, u32Pin) = 1;

        GPIO_PIN_ADDR(2, u32Pin) = 0;

    }

}



/**

 * @brief       Timer1 IRQ

 *

 * @param       None

 *

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

 *

 * [url=home.php?mod=space&uid=1543424]@Details[/url]     The Timer1 default IRQ, declared in startup_NUC029xAN.s.

 */

void TMR1_IRQHandler(void)

{

    if(TIMER_GetIntFlag(TIMER1) == 1)

    {

        /* Clear Timer1 time-out interrupt flag */

        TIMER_ClearIntFlag(TIMER1);



        g_au32TMRINTCount[1]++;

    }

}



void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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

    /* Enable IRC22M clock */

    CLK->PWRCON |= CLK_PWRCON_IRC22M_EN_Msk;



    /* Waiting for IRC22M clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_IRC22M_STB_Msk);



    /* Switch HCLK clock source to HIRC */

    CLK->CLKSEL0 = CLK_CLKSEL0_HCLK_S_HIRC;



    /* Set PLL to Power-down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/

    CLK->PLLCON |= CLK_PLLCON_PD_Msk;



    /* Enable external 12 MHz XTAL */

    CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk;



    /* Enable PLL and Set PLL frequency */

    CLK->PLLCON = PLLCON_SETTING;



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk);



    /* Switch HCLK clock source to PLL, STCLK to HCLK/2 */

    CLK->CLKSEL0 = CLK_CLKSEL0_STCLK_S_HCLK_DIV2 | CLK_CLKSEL0_HCLK_S_PLL;



    /* Enable peripheral clock */

    CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk | CLK_APBCLK_TMR1_EN_Msk;



    /* Peripheral clock source */

    CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL | CLK_CLKSEL1_TMR1_S_HCLK;



    /* Update System Core Clock */

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

    SystemCoreClockUpdate();



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

    /* Init I/O Multi-function                                                                                 */

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

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

    SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P35_T1;

}



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();



    /* 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("|    Timer1 External Counter Input Sample Code    |\n");

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



    printf("# Timer Settings:\n");

    printf("  Timer1: Clock source is HCLK(50 MHz); Continuous counting mode; Interrupt enable;\n");

    printf("          External counter input enable; TCMP is 56789.\n");

    printf("# Connect P2.0 to T1 pin and pull P2.0 High/Low as T1 counter input source.\n\n");



    /* Configure P2.0 as GPIO output pin and pull pin status to Low first */

    GPIO_SetMode(P2, 0, GPIO_PMD_OUTPUT);

    P20 = 0;



    /* Initial Timer1 default setting */

    TIMER_Open(TIMER1, TIMER_CONTINUOUS_MODE, 1);



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

    TIMER_SELECT_TOUT_PIN(TIMER1, TIMER_TOUT_PIN_FROM_TX_PIN);

    TIMER_SET_PRESCALE_VALUE(TIMER1, 0);

    TIMER_SET_CMP_VALUE(TIMER1, 56789);

    TIMER_EnableEventCounter(TIMER1, TIMER_COUNTER_FALLING_EDGE);

    TIMER_EnableInt(TIMER1);



    /* Enable Timer1 NVIC */

    NVIC_EnableIRQ(TMR1_IRQn);



    /* Clear Timer1 interrupt counts to 0 */

    g_au32TMRINTCount[1] = 0;



    /* Start Timer1 counting */

    TIMER_Start(TIMER1);



    /* To check if TDR of Timer1 must be 0 as default value */

    if(TIMER_GetCounter(TIMER1) != 0)

    {

        printf("Default counter value is not 0. (%d)\n", TIMER_GetCounter(TIMER1));



        /* Stop Timer1 counting */

        TIMER_Close(TIMER1);

        while(1);

    }



    /* To generate one counter event to T1 pin */

    GeneratePORT2Counter(0, 1);



    /* To check if TDR of Timer1 must be 1 */

    while(TIMER_GetCounter(TIMER1) == 0);

    if(TIMER_GetCounter(TIMER1) != 1)

    {

        printf("Get unexpected counter value. (%d)\n", TIMER_GetCounter(TIMER1));



        /* Stop Timer1 counting */

        TIMER_Close(TIMER1);

        while(1);

    }



    /* To generate remains counts to T1 pin */

    GeneratePORT2Counter(0, (56789 - 1));



    while(1)

    {

        if((g_au32TMRINTCount[1] == 1) && (TIMER_GetCounter(TIMER1) == 56789))

        {

            printf("Timer1 external counter input function ... PASS.\n");

            break;

        }

    }



    /* Stop Timer1 counting */

    TIMER_Close(TIMER1);



    while(1);

}



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