给你个深度睡眠的例子。
/******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V1.00
* $Revision: 8 $
* $Date: 15/10/06 11:22a $
* [url=home.php?mod=space&uid=247401]@brief[/url] This sample code demonstrates how to let system enter and exit
* deep sleep mode with external interrupt.
*
* @note
* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "Mini51Series.h"
#include "LCD_Driver.h"
volatile int8_t gi8Key = 1;
char g_strBuf[32] = {0};
void EINT0_IRQHandler(void)
{
/* Clear P3.2 interrupt flag */
P3->ISRC = 1 << 2;
if(P32) {
/* P3.2 is from low to high */
gi8Key = 1;
} else {
/* P3.2 is from high to low */
gi8Key = 0;
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Unlock protected registers */
SYS_UnlockReg();
/* 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, 10kHz */
CLK->PWRCON &= ~CLK_PWRCON_XTLCLK_EN_Msk;
CLK->PWRCON |= (0x1 << CLK_PWRCON_XTLCLK_EN_Pos); // XTAL12M (HXT) Enabled
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_XTL_STB_Msk);
/* Switch HCLK clock source to XTAL */
CLK->CLKSEL0 &= ~CLK_CLKSEL0_HCLK_S_Msk;
CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_XTAL;
/* Enable IP clock */
CLK->APBCLK |= CLK_APBCLK_UART_EN_Msk | CLK_APBCLK_SPI_EN_Msk;
CLK->CLKSEL1 &= ~CLK_CLKSEL1_UART_S_Msk;
CLK->CLKSEL1 |= (0x0 << CLK_CLKSEL1_UART_S_Pos);// Clock source from external 12 MHz or 32 KHz crystal clock
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
SystemCoreClockUpdate();
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P0 multi-function pins for UART RXD and TXD */
SYS->P0_MFP &= ~(SYS_MFP_P00_Msk | SYS_MFP_P01_Msk);
SYS->P0_MFP |= (SYS_MFP_P00_TXD | SYS_MFP_P01_RXD);
/* Lock protected registers */
SYS_LockReg();
}
void UART_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
UART_Open(UART, 115200);
}
void GPIO_Init(void)
{
/* Enable debounce function of P3.2 (EINT0) */
P3->DBEN = (1 << 2);
/* Set debounce time. it is about 6.4 ms */
GPIO->DBNCECON = GPIO_DBNCECON_DBCLKSRC_IRC10K | GPIO_DBNCECON_DBCLKSEL_64;
/* Enable P3.2 to be EINT0 */
GPIO_EnableInt(P3, 2, GPIO_INT_BOTH_EDGE);
NVIC_EnableIRQ(EINT0_IRQn);
}
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
uint32_t u32Cnt;
SYS_UnlockReg();
SYS->P5_MFP = (SYS->P5_MFP & 0x00FFFCFC) | 0x03; /* P5.1 -> XTAL2, P5.0 -> XTAL1 */
CLK->PWRCON = CLK_PWRCON_XTL12M | 4 | 8 ;
/* Init system, IP clock and multi-function I/O */
SYS_Init();
/* Init UART for printf */
UART_Init();
/* Init SPI and LCD */
LCD_Init();
LCD_EnableBackLight();
LCD_ClearScreen();
printf("CPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);
LCD_Print(0, "DeepSleep");
/*Initialize external interrupt*/
GPIO_Init();
/*
P3.2 is used as EINT0 for deep sleep (power down) control.
Press P3.2 will toggle power down/wakeup state to show how to enter power down.
*/
LCD_Print(1, "Press INT ");
while (1) {
char strClearVal[15] = "Count: ";
/* Enter power when key change from low to high */
u32Cnt = 0;
while (gi8Key == 1) {
sprintf(g_strBuf, "Count:%d", u32Cnt++);
LCD_Print(3, strClearVal);
LCD_Print(3, g_strBuf);
}
while(gi8Key == 0) {
sprintf(g_strBuf, "Count:%d", u32Cnt++);
LCD_Print(3, strClearVal);
LCD_Print(3, g_strBuf);
}
LCD_Print(2, "Deep Sleeping...");
/* Unlock protected registers */
SYS_UnlockReg();
/* We need to disable debounce function before power down, otherwise, there would be twice interrupt when
wakeup */
P3->DBEN = 0;
/* enter power down */;
CLK_PowerDown();
/* Re-enable debounce function if necessary */
P3->DBEN = (1 << 2);
LCD_Print(2, "Working... ");
printf("\nWorking... \n");
/* Make sure the key is return to high before next key action */
while (gi8Key == 0);
gi8Key = 0;
}
}
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