• State Not Answered
  • Locked Locked
  • Replies 6 replies
  • Subscribers 21 subscribers
  • Views 2559 views
  • Users 0 members are here
Options
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Not Reliable Watchdog

Rudy Moniaga

Hi,

I am utilise Watchdog Timer to reset when something goes wrong, but I found that watchdog in LPC2138 is not reliable. Does any one has issue with Watchog Timer in LPC2138?

The following is my Setting at start of program:

    WDTC   = 0x01FFFFFF;  // Setting Timer
    WDMOD  = 0x03;        // Reset and Interrupt
    WDFEED = 0xAA;        // Sequence Feeding
    WDFEED = 0x55;        // Sequence Feeding

Then every interval one second feed the watchdog as follow:

    WDFEED = 0xAA;
    WDFEED = 0x55;

The problem is watchdog reset un-reliable. The following is the log:

Ext,Last Reset:20 Feb 2009 10:36:43
WDT,Last Reset:20 Feb 2009 10:43:29
WDT,Last Reset:20 Feb 2009 10:48:47
WDT,Last Reset:20 Feb 2009 10:54:05
WDT,Last Reset:20 Feb 2009 10:59:23

Above log data is in my application that trace current situation. Ext is external reset just after down load program in device. WDT is reset because of Watchdog timer.

Is there any idea or errata note regarding watchdog timer?

Rudy

0