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I can't get the watchdog timer to work. I set up with the following // set watchdog to be 1 second WDTC = 15000000; // enable the watchdog interrupt WDMOD = 1; WDFEED = 0xAA; WDFEED = 0x55; I then feed every loop of code. Even if I continually feed after set up the WDTOF and WDINT flags get set. |
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does watchdog work ?
Started by ●September 15, 2004
Reply by ●September 15, 20042004-09-15
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Initialization: /* Setting watchdog work mode */ WDMOD |= WDMOD_WDEN; WDMOD |= WDMOD_WDRESET; /* Dropping watchdog timeout flag */ WDMOD &= ~WDMOD_WDTOF; /* Setting watchdog timeout */ WDTC = WatchdogTimeout; WDFEED = 0xAA; WDFEED = 0x55; ----------- Reset each cycle: WDTC &= ~WDMOD_WDTOF; /* Feeding 0xAA, 0x55 to restart watchdog */ WDFEED = WDFEED_WDFEED(0xAA); WDFEED = WDFEED_WDFEED(0x55); This code is from our Watchdog driver. We've successfully test it. |
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Reply by ●September 15, 20042004-09-15
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A side note to all those working on the LPC22xx chips and using external memory: When the watchdog times out it will try to access vector memory at relative 0x00000000 using the memory attached to CS0 (instead of address 0 of the internal flash memory). --- In , "cd_racer2" <cd_racer@m...> wrote: > Initialization: > > /* Setting watchdog work mode */ > WDMOD |= WDMOD_WDEN; > WDMOD |= WDMOD_WDRESET; > /* Dropping watchdog timeout flag */ > WDMOD &= ~WDMOD_WDTOF; > /* Setting watchdog timeout */ > WDTC = WatchdogTimeout; > > WDFEED = 0xAA; > WDFEED = 0x55; > > ----------- > Reset each cycle: > > WDTC &= ~WDMOD_WDTOF; > /* Feeding 0xAA, 0x55 to restart watchdog */ > WDFEED = WDFEED_WDFEED(0xAA); > WDFEED = WDFEED_WDFEED(0x55); > > This code is from our Watchdog driver. We've successfully test it. |
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Reply by ●September 15, 20042004-09-15
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FWIW: The following routine worked for me. I used P0.4 &5 to be able to see an i/o pin assert and de-assert using the Keil MCB2100(no expansion bus): void init_WDT (void){ WDTC = 0xFF; WDMOD= 0x03; WDFEED=0xAA; WDFEED=0x55; } void init_iopins4and5 (void){ PINSEL0=0x0; IODIR0=0x00000030; IOCLR0 = 0x00000030; } long count; long spare; int main (void) { count=0x0; spare=0x0; /* Establish Port 0 bit 4 and 5 as outputs and de-assert both */ init_iopins4and5(); if (WDMOD==0x04) IOSET0=0x00000020; //P0.05 set else spare++;/*startup the watchdog timer - watchdog interrupt enable = 1 - watchdog reset enable = 1 SO when WDEN and Watchdog timeout happens, a hardware reset should occur */ init_WDT(); if (WDMOD==0x03) IOSET0 =0x00000010; //set P0.04 else spare++; while (1); Regards, Will }--- In , "markcrow" <mcrow@p...> wrote: > A side note to all those working on the LPC22xx chips and using > external memory: When the watchdog times out it will try to access > vector memory at relative 0x00000000 using the memory attached to CS0 > (instead of address 0 of the internal flash memory). > --- In , "cd_racer2" <cd_racer@m...> wrote: > > Initialization: > > > > /* Setting watchdog work mode */ > > WDMOD |= WDMOD_WDEN; > > WDMOD |= WDMOD_WDRESET; > > /* Dropping watchdog timeout flag */ > > WDMOD &= ~WDMOD_WDTOF; > > /* Setting watchdog timeout */ > > WDTC = WatchdogTimeout; > > > > WDFEED = 0xAA; > > WDFEED = 0x55; > > > > ----------- > > Reset each cycle: > > > > WDTC &= ~WDMOD_WDTOF; > > /* Feeding 0xAA, 0x55 to restart watchdog */ > > WDFEED = WDFEED_WDFEED(0xAA); > > WDFEED = WDFEED_WDFEED(0x55); > > > > This code is from our Watchdog driver. We've successfully test > it. |
