/*---------------------------------------------------------------------------------------------------------*/
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.0 to check time-out period time */
GPIO_SetMode(PA, BIT0, GPIO_PMD_OUTPUT);
PA0 = 1;
WDT_CLEAR_RESET_FLAG();
printf("\n\n*** WDT time-out reset occurred ***\n");
while(1);
}
printf("\n\nCPU @ %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 1.6384 ~ 1.7408 s.\n");
printf(" Measure PA.0 low period to check time-out interval and do not reload WDT counter will cause system reset.\n\n");
/* Use PA.0 to check time-out period time */
GPIO_SetMode(PA, BIT0, GPIO_PMD_OUTPUT);
PA0 = 1;
PA0 = 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);
}
/*---------------------------------------------------------------------------------------------------------*/
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 @ %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 1.6384 ~ 1.7408 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 1.6384 ~ 1.7408 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 time-out period time */
PA->MODE = 0xFFFFFFFD;
PA0 = 1;
/* Enable WDT NVIC */
NVIC_EnableIRQ(WDT_IRQn);
/* 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 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);
}
}
