void WDTInit( void )
{
uint32_t i;
//uint32_t wdtFreq;
/* Initialize WWDT (also enables WWDT clock) */
Chip_WWDT_Init(LPC_WWDT);
/* Prior to initializing the watchdog driver, the clocking for the
watchdog must be enabled. This example uses the watchdog oscillator
set at a 50KHz (1Mhz / 20) clock rate. */
Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_WDTOSC_PD);
Chip_Clock_SetWDTOSC(WDTLFO_OSC_1_05, 20);
/* The WDT divides the input frequency into it by 4 */
//wdtFreq = Chip_Clock_GetWDTOSCRate() / 4;
/* LPC1102/4, LPC11XXLV, and LPC11CXX devices select the watchdog
clock source from the SYSCLK block, while LPC11AXX, LPC11EXX, and
LPC11UXX devices select the clock as part of the watchdog block. */
/* Select watchdog oscillator for WDT clock source */
Chip_WWDT_SelClockSource(LPC_WWDT, WWDT_CLKSRC_WATCHDOG_WDOSC);
Chip_WWDT_SetTimeOut(LPC_WWDT, 0x7FFF);
Chip_WWDT_SetOption(LPC_WWDT, (WWDT_WDMOD_WDEN|WWDT_WDMOD_WDRESET));
Chip_WWDT_Feed(LPC_WWDT);
/* Make sure feed sequence executed properly */
for (i = 0; i < 0x80; i++);
return;
}
void initWatchdog()
{
Chip_WWDT_Init(LPC_WWDT); // Initialize watchdog
sysctlPowerUp(SYSCTL_POWERDOWN_WDTOSC_PD); // Enable watchdog oscillator
Chip_Clock_SetWDTOSC(WDTLFO_OSC_0_60, 4); // WDT osc rate 0.6 MHz / 4 = 150 kHz
Chip_Clock_SetWDTClockSource(SYSCTL_WDTCLKSRC_WDTOSC, 1); // Clocking watchdog from its osc, div rate 1
Chip_WWDT_SetTimeOut(LPC_WWDT, 37500); // 1 sec (hardcoded to reduce code size)
Chip_WWDT_SetOption(LPC_WWDT, WWDT_WDMOD_WDRESET); // Mode: reset on timeout
Chip_WWDT_Start(LPC_WWDT); // Go
}
/**
* @brief Main routine for WWDT example
* @return Nothing
*/
int main(void)
{
uint32_t wdtFreq;
/* Board Setup */
Board_Init();
/* Initialize WWDT (also enables WWDT clock) */
Chip_WWDT_Init(LPC_WWDT);
/* Prior to initializing the watchdog driver, the clocking for the
watchdog must be enabled. This example uses the watchdog oscillator
set at a 50KHz (1Mhz / 20) clock rate. */
Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_WDTOSC_PD);
Chip_Clock_SetWDTOSC(WDTLFO_OSC_1_05, 20);
/* The WDT divides the input frequency into it by 4 */
wdtFreq = Chip_Clock_GetWDTOSCRate() / 4;
/* LPC1102/4, LPC11XXLV, and LPC11CXX devices select the watchdog
clock source from the SYSCLK block, while LPC11AXX, LPC11EXX, and
LPC11UXX devices select the clock as part of the watchdog block. */
/* Select watchdog oscillator for WDT clock source */
#if defined(CHIP_LPC110X) || defined(CHIP_LPC11XXLV) || defined(CHIP_LPC11CXX) || defined(CHIP_LPC11EXX)
Chip_Clock_SetWDTClockSource(SYSCTL_WDTCLKSRC_WDTOSC, 1);
#else
Chip_WWDT_SelClockSource(LPC_WWDT, WWDT_CLKSRC_WATCHDOG_WDOSC);
#endif
Board_LED_Set(0, false);
/* Set watchdog feed time constant to approximately 2s
Set watchdog warning time to 512 ticks after feed time constant
Set watchdog window time to 3s */
Chip_WWDT_SetTimeOut(LPC_WWDT, wdtFreq * 2);
#if !defined(CHIP_LPC11CXX)
Chip_WWDT_SetWarning(LPC_WWDT, 512);
Chip_WWDT_SetWindow(LPC_WWDT, wdtFreq * 3);
#endif
#if !defined(CHIP_LPC11CXX)
/* Configure WWDT to reset on timeout */
Chip_WWDT_SetOption(LPC_WWDT, WWDT_WDMOD_WDRESET);
#endif
/* Setup Systick to feed the watchdog timer. This needs to be done
* at a rate faster than the WDT warning. */
SysTick_Config(Chip_Clock_GetSystemClockRate() / 50);
/* Clear watchdog warning and timeout interrupts */
#if !defined(CHIP_LPC11CXX)
Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF | WWDT_WDMOD_WDINT);
#else
Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF);
#endif
/* Clear and enable watchdog interrupt */
NVIC_ClearPendingIRQ(WDT_IRQn);
NVIC_EnableIRQ(WDT_IRQn);
/* Start watchdog */
Chip_WWDT_Start(LPC_WWDT);
/* Idle while waiting */
while (1) {
__WFI();
}
}
