/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 7 $
* $Date: 15/09/14 4:22p $
* @brief
* Demonstrate how to cause WDT time-out reset system event while WDT time-out reset delay period expired.
*
* @note
* Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.
******************************************************************************/
#include <stdio.h>
#include "NUC123.h"
#define HCLK_CLOCK 72000000
/*---------------------------------------------------------------------------------------------------------*/
/* Global Interface Variables Declarations */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint8_t g_u8IsWDTTimeoutINT = 0;
/**
* [url=home.php?mod=space&uid=247401]@brief[/url] 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_NUC123.s.
*/
void WDT_IRQHandler(void)
{
if(WDT_GET_TIMEOUT_INT_FLAG() == 1)
{
/* Clear WDT time-out interrupt flag */
WDT_CLEAR_TIMEOUT_INT_FLAG();
g_u8IsWDTTimeoutINT = 1;
printf("WDT time-out interrupt occurred.\n");
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable IRC22M clock */
CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
/* Waiting for IRC22M clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to HIRC */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
/* Enable XT1_OUT(PF.0) and XT1_IN(PF.1) */
SYS->GPF_MFP |= SYS_GPF_MFP_PF0_XT1_OUT | SYS_GPF_MFP_PF1_XT1_IN;
/* Enable external 12 MHz XTAL, IRC10K */
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC10K_EN_Msk);
/* Waiting for clock ready */
while(!CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_OSC10K_STB_Msk));
/* Set core clock as HCLK_CLOCK */
CLK_SetCoreClock(HCLK_CLOCK);
/* Enable peripheral clock */
CLK_EnableModuleClock(UART0_MODULE);
CLK_EnableModuleClock(WDT_MODULE);
/* Peripheral clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));
CLK_SetModuleClock(WDT_MODULE, CLK_CLKSEL1_WDT_S_LIRC, 0);
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set PB multi-function pins for UART0 RXD, TXD */
SYS->GPB_MFP = SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD;
}
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();
if(WDT_GET_RESET_FLAG() == 1)
{
/* Use PA.10 to check time-out period time */
GPIO_SetMode(PA, BIT10, GPIO_PMD_OUTPUT);
PA10 = 1;
WDT_CLEAR_RESET_FLAG();
printf("\n\n*** WDT time-out reset occurred ***\n");
while(1);
}
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);
printf("+--------------------------------------+\n");
printf("| WDT Time-out Reset Sample Code |\n");
printf("+--------------------------------------+\n\n");
printf("# WDT Settings:\n");
printf(" Clock source is 10 kHz; Enable interrupt; Time-out interval is 2^14 * WDT clock.\n");
printf("# When WDT start counting, system will generate a WDT time-out interrupt after around 1.6384 s.\n");
printf(" Measure PA.10 low period to check time-out interval and do not reload WDT counter will cause system reset.\n\n");
/* Use PA.10 to check time-out period time */
GPIO_SetMode(PA, BIT10, GPIO_PMD_OUTPUT);
PA10 = 1;
PA10 = 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 time-out reset function and select time-out interval to 2^14 * WDT clock then start WDT counting */
g_u8IsWDTTimeoutINT = 0;
WDT_Open(WDT_TIMEOUT_2POW14, WDT_RESET_DELAY_1026CLK, TRUE, FALSE);
/* Enable WDT interrupt function */
WDT_EnableInt();
/* Enable WDT NVIC */
NVIC_EnableIRQ(WDT_IRQn);
while(1);
}
/*** (C) COPYRIGHT 2014~2015 Nuvoton Technology Corp. ***/
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