定时器翻转输出模式

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

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

 * [url=home.php?mod=space&uid=895143]@version[/url]  V1.00

 * $Revision: 1 $

 * $Date: 14/09/15 2:23p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Demonstrate the timer 0 toggle out function on pin PB.8

 *

 * @note

 * Copyright (C) 2013-2014 Nuvoton Technology Corp. All rights reserved.

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

#include <stdio.h>

#include "Nano100Series.h"



void SYS_Init(void)

{



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

    /* Init System Clock                                                                                       */

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

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable External XTAL (4~24 MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HXT_EN_Msk);



    /* Waiting for 12MHz clock ready */

    CLK_WaitClockReady( CLK_CLKSTATUS_HXT_STB_Msk);



    /* Switch HCLK clock source to HXT */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HXT,CLK_HCLK_CLK_DIVIDER(1));



    /* Enable IP clock */

    CLK_EnableModuleClock(UART0_MODULE);

    CLK_EnableModuleClock(TMR0_MODULE);





    /* Select IP clock source */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_UART_CLK_DIVIDER(1));

    CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0_S_HXT, 0);



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */

    SystemCoreClockUpdate();





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

    /* Init I/O Multi-function                                                                                 */

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

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

    SYS->PB_L_MFP &= ~(SYS_PB_L_MFP_PB0_MFP_Msk | SYS_PB_L_MFP_PB1_MFP_Msk);

    SYS->PB_L_MFP |= (SYS_PB_L_MFP_PB1_MFP_UART0_TX | SYS_PB_L_MFP_PB0_MFP_UART0_RX);



    /* Set Timer0 event counting/toggle out pin */

    SYS->PB_H_MFP &= ~SYS_PB_H_MFP_PB8_MFP_Msk;

    SYS->PB_H_MFP |= SYS_PB_H_MFP_PB8_MFP_TMR0_EXT;



    /* Lock protected registers */

    SYS_LockReg();



}







int main(void)

{

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

       In the end of SYS_Init() will issue SYS_LockReg()

       to lock protected register. If user want to write

       protected register, please issue SYS_UnlockReg()

       to unlock protected register if necessary */

    SYS_Init();



    /* Init UART to 115200-8n1 for print message */

    UART_Open(UART0, 115200);



    printf("\nThis sample code use timer 0 to generate 500Hz toggle output to TM0_CNT_OUT(PB.8) pin\n");



    /* To generate 500HZ toggle output, timer frequency must set to 1000Hz.

       Because toggle output state change on every timer timeout event */

    TIMER_Open(TIMER0, TIMER_TOGGLE_MODE, 1000);

    TIMER_Start(TIMER0);



    while(1);

}



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