[牛人杂谈] 掉电模式的应用

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

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

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

 * $Revision: 2 $

 * $Date: 16/10/25 4:29p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Show how to wake up system from Power-down mode by GPIO interrupt.

 * @note

 * Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.

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

#include <stdio.h>

#include "NUC029xGE.h"





#define PLLCTL_SETTING  CLK_PLLCTL_72MHz_HXT

#define PLL_CLOCK       72000000





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

/*  Function for System Entry to Power Down Mode                                                           */

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

void PowerDownFunction(void)

{

    /* Check if all the debug messages are finished */

    UART_WAIT_TX_EMPTY(UART0);



    /* Enter to Power-down mode */

    CLK_PowerDown();

}



/**

 * @brief       PortA/PortB IRQ

 *

 * @param       None

 *

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

 *

 * [url=home.php?mod=space&uid=1543424]@Details[/url]     The PortA/PortB default IRQ, declared in startup_NUC029xGE.s.

 */

void GPAB_IRQHandler(void)

{

    /* To check if PB.3 interrupt occurred */

    if(GPIO_GET_INT_FLAG(PB, BIT3))

    {

        GPIO_CLR_INT_FLAG(PB, BIT3);

        printf("PB.3 INT occurred.\n");

    }

    else

    {

        /* Un-expected interrupt. Just clear all PB interrupts */

        PB->INTSRC = PB->INTSRC;

        printf("Un-expected interrupts.\n");

    }

}



void SYS_Init(void)

{



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

    /* Init System Clock                                                                                       */

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



    /* 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 HCLK source 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 PLL_CLOCK from PLL */

    CLK_SetCoreClock(PLL_CLOCK);



    /* Enable UART module clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Select UART module clock source as HXT and UART module clock divider as 1 */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));



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

    /* Init I/O Multi-function                                                                                 */

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



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

    SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA2MFP_Msk | SYS_GPA_MFPL_PA3MFP_Msk);

    SYS->GPA_MFPL |= (SYS_GPA_MFPL_PA3MFP_UART0_RXD | SYS_GPA_MFPL_PA2MFP_UART0_TXD);



}



void UART0_Init()

{

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

    /* Init UART                                                                                               */

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

    /* Reset UART0 */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 baud rate */

    UART_Open(UART0, 115200);

}



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

/* MAIN function                                                                                           */

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

int main(void)

{

    /* 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("|    GPIO Power-Down and Wake-up by PB.3 Sample Code    |\n");

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



    /* Configure PB.3 as Input mode and enable interrupt by rising edge trigger */

    GPIO_SetMode(PB, BIT3, GPIO_MODE_INPUT);

    GPIO_EnableInt(PB, 3, GPIO_INT_RISING);

    NVIC_EnableIRQ(GPAB_IRQn);



    /* Enable interrupt de-bounce function and select de-bounce sampling cycle time is 1024 clocks of LIRC clock */

    GPIO_SET_DEBOUNCE_TIME(GPIO_DBCTL_DBCLKSRC_LIRC, GPIO_DBCTL_DBCLKSEL_1024);

    GPIO_ENABLE_DEBOUNCE(PB, BIT3);



    /* Unlock protected registers before entering Power-down mode */

    SYS_UnlockReg();



    /* Waiting for PB.3 rising-edge interrupt event */

    printf("Enter to Power-Down ......\n");



    /* Enter to Power-down mode */

    PowerDownFunction();



    printf("System waken-up done.\n\n");



    while(1);



}



/*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/

CLK_PowerDown();

/**

  * @brief      Enter to Power-down mode

  * @param      None

  * @return     None

  * @details    This function is used to let system enter to Power-down mode. \n

  *             The register write-protection function should be disabled before using this function.

  */

void CLK_PowerDown(void)

{

    /* Set the processor uses deep sleep as its low power mode */

    SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;



    /* Set system Power-down enabled*/

    CLK->PWRCTL |= CLK_PWRCTL_PDEN_Msk;



    /* Chip enter Power-down mode after CPU run WFI instruction */

    __WFI();

}