/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V2.10
* $Date: 15/10/12 8:06p $
* [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) 2012 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "mini51series.h"
#include "GPIO.h"
/**
* @brief Port0/Port1 IRQ
*
* @param None
*
* [url=home.php?mod=space&uid=266161]@return[/url] None
*
* [url=home.php?mod=space&uid=1543424]@Details[/url] The Port0/Port1 default IRQ, declared in startup_Mini51.s.
*/
void GPIO01_IRQHandler(void)
{
/* To check if P1.5 interrupt occurred */
if (P1->ISRC & BIT5) {
P1->ISRC = BIT5;
printf("P1.5 INT occurred. \n");
} else {
/* Un-expected interrupt. Just clear all PORT0, PORT1 interrupts */
P0->ISRC = P0->ISRC;
P1->ISRC = P1->ISRC;
printf("Un-expected interrupts. \n");
}
}
void SYS_Init(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P5.0 and P5.1 -> XTAL */
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->PWRCON |= CLK_PWRCON_XTL12M | CLK_PWRCON_IRC22M_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(SYS_IPRSTC2_UART_RST_Msk);
/* Configure UART and set UART Baudrate */
UART_Open(UART, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main (void)
{
/* Init System, IP clock and multi-function I/O */
SYS_Init(); //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.
/* Init UART for printf */
UART_Init();
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %dHz\n", SystemCoreClock);
printf("+--------------------------------------+ \n");
printf("| MINI51 GPIO Wake-up Sample Code | \n");
printf("+--------------------------------------+ \n");
/* Configure P1.5 as Input mode and enable interrupt by rising edge trigger */
GPIO_SetMode(P1, BIT5, GPIO_PMD_INPUT);
GPIO_EnableInt(P1, 5, GPIO_INT_RISING);
NVIC_EnableIRQ(GPIO01_IRQn);
/* Waiting for interrupts */
while (1) {
printf("Enter to Power-Down ......\n");
while(!UART_IS_TX_EMPTY(UART0));
CLK_PowerDown();
printf("System waken-up done.\n\n");
}
}
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