[DemoCode下载] MINI51的PDID以及SYS相关操作演示

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

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

 * [url=home.php?mod=space&uid=895143]@version[/url]  V2.00

 * $Date: 15/10/06 1:21p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Demonstrate how to get PDID, get and clear reset source, configure

 *           BOD, and output system clock to CKO pin with the system

 *           clock / 4 frequency

 *

 * @note

 * Copyright (C) 2012 Nuvoton Technology Corp. All rights reserved.

 *

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

#include <stdio.h>

#include "Mini51Series.h"



#define SIGNATURE       0x125ab234

#define FLAG_ADDR       0x200007FC



extern char GetChar(void);

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

/*  Brown Out Detector IRQ Handler                                                                         */

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

void BOD_IRQHandler(void)

{

    /* Clear Interrupt Flag */

    SYS->BODCTL |= SYS_BODCR_BOD_INTF_Msk;



    printf("Brown Out is Detected\n");

}



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

/*  Power Down Wake Up IRQ Handler                                                                         */

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

void PWRWU_IRQHandler(void)

{

    /* Clear Power Down Wake Up interrupt flag */

    CLK->PWRCON |= CLK_PWRCON_PD_WU_STS_Msk;



    printf("Wake Up Interrupt is asserted\n");

}



void SYS_Init(void)

{

    /* Unlock protected registers */

    SYS_UnlockReg();



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

    /* Init System Clock                                                                                       */

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

    /* Set P5 multi-function pins for XTAL1 and XTAL2 */

    SYS->P5_MFP &= ~(SYS_MFP_P50_Msk | SYS_MFP_P51_Msk);

    SYS->P5_MFP |= (SYS_MFP_P50_XTAL1 | SYS_MFP_P51_XTAL2);



    /* Enable external 12MHz XTAL, internal 22.1184MHz */

    CLK_EnableXtalRC(CLK_PWRCON_HXT|CLK_PWRCON_HIRC_EN_Msk);



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_XTL_STB_Msk | CLK_CLKSTATUS_IRC22M_STB_Msk);



    /* Switch HCLK clock source to XTL */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_XTAL,CLK_CLKDIV_HCLK(1));



    /* STCLK to XTL STCLK to XTL */

    CLK_SetSysTickClockSrc(CLK_CLKSEL0_STCLK_S_XTAL);



    /* Enable IP clock */

    CLK_EnableModuleClock(UART_MODULE);



    /* Select IP clock source */

    CLK_SetModuleClock(UART_MODULE,CLK_CLKSEL1_UART_S_XTAL,CLK_CLKDIV_UART(1));



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

    /* Init I/O Multi-function                                                                                 */

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

    /* Set P0 multi-function pins for UART RXD and TXD */

    SYS->P0_MFP &= ~(SYS_MFP_P01_Msk | SYS_MFP_P00_Msk);

    SYS->P0_MFP |= (SYS_MFP_P01_RXD | SYS_MFP_P00_TXD);



    /* Set P3 multi-function pins for Clock Output */

    SYS->P3_MFP = SYS_MFP_P36_CKO;



    /* To update the variable SystemCoreClock */

    SystemCoreClockUpdate();



    /* Lock protected registers */

    SYS_LockReg();

}



void UART_Init(void)

{

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

    /* Init UART                                                                                               */

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

    /* Reset IP */

    SYS_ResetModule(UART_RST);



    /* Configure UART and set UART Baudrate */

    UART_Open(UART, 115200);



}



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

/*  Main Function                                                                                          */

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

int32_t main (void)

{

    uint32_t u32data;



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

    SYS_Init();



    /* Init UART for printf */

    UART_Init();



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



    /*

        This sample code will show some function about system manager controller and clock controller:

        1. Read PDID

        2. Get and clear reset source

        3. Setting about BOD

        4. Output system clock from CKO pin, and the output frequency = system clock / 4

    */



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

    printf("|    Mini51 System Driver Sample Code    |\n");

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



    if (M32(FLAG_ADDR) == SIGNATURE) {

        printf("  CPU Reset success!\n");

        M32(FLAG_ADDR) = 0;

        printf("  Press any key to continue ...\n");

        GetChar();

    }



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

    /* Misc system function test                                                                               */

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



    /* Read Part Device ID */

    printf("Product ID 0x%x\n", SYS->PDID);



    /* Get reset source from last operation */

    u32data = SYS_GetResetSrc();

    printf("Reset Source 0x%x\n", u32data);



    /* Clear reset source */

    SYS_ClearResetSrc(u32data);



    /* Unlock protected registers for Brown-Out Detector settings */

    SYS_UnlockReg();



    /* Check if the write-protected registers are unlocked before BOD setting and CPU Reset */

    if (SYS->RegLockAddr != 0) {

        printf("Protected Address is Unlocked\n");

    }



    /* Enable Brown-Out Detector and Low Voltage Reset function, and set Brown-Out Detector voltage 2.7V ,

       Enable Brown-Out Interrupt function */

    SYS_EnableBOD(SYS_BODCR_BOD_INTERRUPT_EN,SYS_BODCR_BOD_VL_2_7V);



    /* Enable BOD IRQ */

    NVIC_EnableIRQ(BOD_IRQn);



    /* Write a signature work to SRAM to check if it is reset by software */

    M32(FLAG_ADDR) = SIGNATURE;

    printf("\n\n  >>> Reset CPU <<<\n");



    /* Waiting for message send out */

    UART_WAIT_TX_EMPTY(UART);



    /* Switch HCLK clock source to Internal 22MHz */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_IRC22M,0);



    /* Enable CKO and output frequency = system clock / 4 */

    CLK_EnableCKO(CLK_CLKSEL2_FRQDIV_HCLK,1,0);



    /* Reset CPU */

    SYS_ResetCPU();



}