/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 3 $
* $Date: 15/05/22 2:35p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Use WDT time-out interrupt event to wake-up system.
* @note
* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
******************************************************************************/
#include <stdio.h>
#include "M051Series.h"
#define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK 50000000
/*---------------------------------------------------------------------------------------------------------*/
/* Global Interface Variables Declarations */
/*---------------------------------------------------------------------------------------------------------*/
extern int IsDebugFifoEmpty(void);
volatile uint8_t g_u8IsWDTWakeupINT = 0;
/*---------------------------------------------------------------------------------------------------------*/
/* Function for System Entry to Power-down Mode */
/*---------------------------------------------------------------------------------------------------------*/
void PowerDownFunction(void)
{
printf("System enter to power-down mode.\n\n");
/* To check if all the debug messages are finished */
while(IsDebugFifoEmpty() == 0);
SCB->SCR = 4;
/* To program PWRCON register, it needs to disable register protection first. */
CLK->PWRCON = (CLK->PWRCON & ~(CLK_PWRCON_PWR_DOWN_EN_Msk | CLK_PWRCON_PD_WAIT_CPU_Msk)) |
CLK_PWRCON_PD_WAIT_CPU_Msk | CLK_PWRCON_PD_WU_INT_EN_Msk;
CLK->PWRCON |= CLK_PWRCON_PWR_DOWN_EN_Msk;
__WFI();
}
/**
* @brief IRQ Handler for WDT and WWDT Interrupt
*
* @param None
*
* [url=home.php?mod=space&uid=266161]@return[/url] None
*
* [url=home.php?mod=space&uid=1543424]@Details[/url] The WDT_IRQHandler is default IRQ of WDT and WWDT, declared in startup_M051Series.s.
*/
void WDT_IRQHandler(void)
{
if((WDT_GET_TIMEOUT_INT_FLAG() == 1) && (WDT_GET_TIMEOUT_WAKEUP_FLAG() == 1))
{
/* Clear WDT time-out interrupt and wake-up flag */
WDT_CLEAR_TIMEOUT_INT_FLAG();
WDT_CLEAR_TIMEOUT_WAKEUP_FLAG();
g_u8IsWDTWakeupINT = 1;
printf("WDT time-out wake-up interrupt occurred.\n");
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable IRC22M clock */
CLK->PWRCON |= CLK_PWRCON_IRC22M_EN_Msk;
/* Waiting for IRC22M clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_IRC22M_STB_Msk);
/* Switch HCLK clock source to HIRC */
CLK->CLKSEL0 = CLK_CLKSEL0_HCLK_S_HIRC;
/* Set PLL to Power-down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/
CLK->PLLCON |= CLK_PLLCON_PD_Msk;
/* Enable external 12 MHz XTAL, IRC10K */
CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC10K_EN_Msk;
/* Enable PLL and Set PLL frequency */
CLK->PLLCON = PLLCON_SETTING;
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_IRC10K_STB_Msk);
/* Switch HCLK clock source to PLL, STCLK to HCLK/2 */
CLK->CLKSEL0 = CLK_CLKSEL0_STCLK_S_HCLK_DIV2 | CLK_CLKSEL0_HCLK_S_PLL;
/* Enable peripheral clock */
CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk | CLK_APBCLK_WDT_EN_Msk;
/* Peripheral clock source */
CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL | CLK_CLKSEL1_WDT_S_LIRC;
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
SystemCoreClockUpdate();
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P3 multi-function pins for UART0 RXD, TXD */
SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;
}
void UART0_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset IP */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 Baudrate */
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("| WDT Power-down and Wake-up Sample Code |\n");
printf("+----------------------------------------------+\n\n");
printf("# WDT Settings:\n");
printf(" Clock source is 10 kHz; Enable interrupt; Enable Wake-up; Time-out interval is 2^16 * WDT clock.\n");
printf("# When WDT statr counting, system will generate a WDT time-out interrupt after 6.5536 ~ 6.656 s.\n");
printf(" Measure P0.0 low period to check time-out interval and system can be waken-up by WDT time-out event.\n\n");
/* Use P0.0 to check time-out period time */
GPIO_SetMode(P0, 0, GPIO_PMD_OUTPUT);
P00 = 1;
P00 = 0;
/* Because of all bits can be written in WDT Control Register are write-protected;
To program it needs to disable register protection first. */
SYS_UnlockReg();
/* Enable WDT wake-up function and select time-out interval to 2^16 * WDT clock then start WDT counting */
g_u8IsWDTWakeupINT = 0;
WDT_Open(WDT_TIMEOUT_2POW16, WDT_RESET_DELAY_1026CLK, FALSE, TRUE);
/* Enable WDT interrupt function */
WDT_EnableInt();
/* Enable WDT NVIC */
NVIC_EnableIRQ(WDT_IRQn);
/* System entry into Power-down Mode */
PowerDownFunction();
/* Check if WDT time-out interrupt and wake-up interrupt flag occurred */
while(1)
{
if(((CLK->PWRCON & CLK_PWRCON_PD_WU_STS_Msk) == CLK_PWRCON_PD_WU_STS_Msk) && (g_u8IsWDTWakeupINT == 1))
break;
}
P00 = 1;
/* Clear Power-down wake-up interrupt flag */
CLK->PWRCON |= CLK_PWRCON_PD_WU_STS_Msk;
/* Disable WDT counting */
WDT_Close();
while(1);
}
/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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