NuTinySDKM451自带的例子

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

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

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

 * $Date: 15/09/02 10:03a $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Toggle PC.9 to turn on / off the board LED

 *

 * @note

 * Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved.

 *

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

#include <stdio.h>

#include "M451Series.h"



#define HCLK_CLOCK       72000000





void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable HIRC clock (Internal RC 22.1184MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Wait for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Select HCLK clock source as HIRC and and HCLK clock divider as 1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Enable HXT clock (external XTAL 12MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);



    /* Wait for HXT clock ready */

    CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);



    /* Set core clock as HCLK_CLOCK */

    CLK_SetCoreClock(HCLK_CLOCK);



    /* Update System Core Clock */

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

    SystemCoreClockUpdate();



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

    /* Init I/O Multi-function                                                                                 */

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

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

    SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD6MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);

    SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD6MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);



    /* Lock protected registers */

    SYS_LockReg();

}





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

/* MAIN function                                                                                           */

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

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();



    /* Select SysTick clock source as HXT */

    CLK_SetSysTickClockSrc(CLK_CLKSEL0_STCLKSEL_HXT);



    /* Configure PC.9 as Output mode */

    GPIO_SetMode(PC, BIT9, GPIO_MODE_OUTPUT);



    while(1)

    {

        /* Configure PC.9 to low */

        PC9 = 0;

        /* Delay 200 ms */

        CLK_SysTickDelay(200000);



        /* Configure PC.9 to high */

        PC9 = 1;

        /* Delay 200 ms */

        CLK_SysTickDelay(200000);

    }



}