/******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V1.00
* $Revision: 6 $
* $Date: 18/07/10 11:21a $
* @brief
* Demonstrate how to cause WDT time-out reset system event while WDT time-out reset delay period expired.
*
* @note
* SPDX-License-Identifier: Apache-2.0
* Copyright (C) 2018 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "NuMicro.h"
/*---------------------------------------------------------------------------------------------------------*/
/* Global Interface Variables Declarations */
/*---------------------------------------------------------------------------------------------------------*/
extern int IsDebugFifoEmpty(void);
volatile uint32_t g_u32WDTINTCounts;
volatile uint8_t g_u8IsWDTWakeupINT;
/**
* [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_M031Series.s.
*/
void WDT_IRQHandler(void)
{
if(g_u32WDTINTCounts < 10)
WDT_RESET_COUNTER();
if(WDT_GET_TIMEOUT_INT_FLAG() == 1)
{
/* Clear WDT time-out interrupt flag */
WDT_CLEAR_TIMEOUT_INT_FLAG();
g_u32WDTINTCounts++;
}
if(WDT_GET_TIMEOUT_WAKEUP_FLAG() == 1)
{
/* Clear WDT time-out wake-up flag */
WDT_CLEAR_TIMEOUT_WAKEUP_FLAG();
g_u8IsWDTWakeupINT = 1;
}
}
void SYS_Init(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Enable HIRC clock */
CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);
/* Waiting for HIRC clock ready */
CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);
/* Switch HCLK clock source to HIRC and HCLK source divide 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
/* Enable UART0 clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Switch UART0 clock source to HIRC */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));
/* Switch WDT clock source to LIRC */
CLK_SetModuleClock(WDT_MODULE, CLK_CLKSEL1_WDTSEL_LIRC, 0);
/* Enable WDT clock */
CLK_EnableModuleClock(WDT_MODULE);
/* Update System Core Clock */
SystemCoreClockUpdate();
/* Set PB multi-function pins for UART0 RXD=PB.12 and TXD=PB.13 */
SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk))
|(SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);
/* Lock protected registers */
SYS_LockReg();
}
/*---------------------------------------------------------------------------------------------------------*/
/* 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 to 115200-8n1 for print message */
UART_Open(UART0, 115200);
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);
printf("+----------------------------------------+\n");
printf("| WDT Time-out Wake-up Sample Code |\n");
printf("+----------------------------------------+\n\n");
/* To check if system has been reset by WDT time-out reset or not */
if(WDT_GET_RESET_FLAG() == 1)
{
WDT_CLEAR_RESET_FLAG();
printf("*** System has been reset by WDT time-out event ***\n\n");
while(1);
}
printf("# WDT Settings:\n");
printf(" - Clock source is LIRC \n");
printf(" - Time-out interval is 2^14 * WDT clock \n");
printf(" (around 0.4266 ~ 0.4270 s) \n");
printf(" - Interrupt enable \n");
printf(" - Wake-up function enable \n");
printf(" - Reset function enable \n");
printf(" - Reset delay period is 18 * WDT clock \n");
printf("# System will generate a WDT time-out interrupt event after 0.4266 ~ 0.4270 s, \n");
printf(" and will be wake up from power-down mode also.\n");
printf(" (Use PA.0 high/low period time to check WDT time-out interval)\n");
printf("# When WDT interrupt counts large than 10, \n");
printf(" we will not reset WDT counter value and system will be reset immediately by WDT time-out reset signal.\n");
/* Use PA.0 to check WWDT compare match interrupt period time */
GPIO_SetMode(PA, BIT0, GPIO_MODE_OUTPUT);
PA0 = 1;
/* 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();
/* Configure WDT settings and start WDT counting */
g_u32WDTINTCounts = g_u8IsWDTWakeupINT = 0;
WDT_Open(WDT_TIMEOUT_2POW14, WDT_RESET_DELAY_18CLK, TRUE, TRUE);
/* Enable WDT NVIC */
NVIC_EnableIRQ(WDT_IRQn);
/* Enable WDT interrupt function */
WDT_EnableInt();
while(1)
{
/* System enter to Power-down */
/* To program PWRCTL register, it needs to disable register protection first. */
SYS_UnlockReg();
printf("\nSystem enter to power-down mode ...\n");
/* To check if all the debug messages are finished */
while(IsDebugFifoEmpty() == 0);
CLK_PowerDown();
/* Check if WDT time-out interrupt and wake-up occurred or not */
while(g_u8IsWDTWakeupINT == 0);
g_u8IsWDTWakeupINT = 0;
PA0 ^= 1;
printf("System has been waken up done. WDT interrupt counts: %d.\n\n", g_u32WDTINTCounts);
}
}
/*** (C) COPYRIGHT 2018 Nuvoton Technology Corp. ***/
| 
楼主
标题置顶
标题高亮
