Ooops..! Thanks a lot. wishful thinking from my part I guess. ;-) I'm back on square one then. hmmm... I really need to solve this. I have done a small program that initialize the watchdog as of my previous example and then just loop while "feeding the dog" just after a debug output on the serial channel. But the result is the same. No output and I have to hold p0.14 low and re power the board to be able to bootload it. /Ake Bill Knight wrote: > Actually it is writing 0xAA then 0x55. The second line of the > disassembly is mvn (move negative). It loads the inverted value > of 85=0x55 (0xFFFFFFAA) into r3. The next line stores the low > order byte WFEED (-536870904=0xE0000008). > > Regards > -Bill Knight > R O SoftWare & > http://www.theARMPatch.com > > > On Tue, 06 Dec 2005 21:22:21 +0100, Ake Hedman, eurosource wrote: > > >I have found part of this problem. The GNU compiler translates > > >WDFEED = 0xAA; WDFEED = 0x55; > > >to > > >710 04c4 8E22A0E3 mov r2, #-536870904 > >711 04c8 5530E0E3 mvn r3, #85 > >712 04cc 0030C2E5 strb r3, [r2, #0] > >713 04d0 8E22A0E3 mov r2, #-536870904 > >714 04d4 5530A0E3 mov r3, #85 > >715 04d8 0030C2E5 strb r3, [r2, #0] > > > >i.e. just writing 0x55. This is done even if compiled with > >optimization of. > > >Anyone know how to work around this? > > >Watchdog registers are currently defined as > > >// Watchdog > >#define WDMOD (*((volatile unsigned char *) 0xE0000000)) > >#define WDTC (*((volatile unsigned long *) 0xE0000004)) > >#define WDFEED (*((volatile unsigned char *) 0xE0000008)) > >#define WDTV (*((volatile unsigned long *) 0xE000000C)) > > > > >/Ake > > > >Ake Hedman, eurosource wrote: > > >> > >> Jim Parziale wrote: > >> > >> > Assuming you have the correct definitions for your symbols, the only > >> > thing I > >> > can think of is setting the timeout to the largest integer like > that. > >> > Maybe > >> > you could try a different large integer? > >> > > >> > These are what you should be using: > >> > WDEN = BIT(0) = 0x00000001 > >> > WDRESET = BIT(1) = 0x00000002 > >> > WDMOD = (uint8_t *)(0xE0000000) > >> > WDTC = (uint32_t *)(0xE0000004) > >> > WDFEED = (uint8_t *)(0xE0000008) > >> > >> Jim, > >> > >> yes my defines are the same and yes I have tested with other values for > >> the watchdog period. According to the manual the watchdog timer should > >> start when the 0xaa, 0x55 sequence is written but my problems are > occurs > >> as soon as I write to the WDMOD register. > >> > >> What situations can prevent the bootloader from working after a reset? > >> > >> /Ake > >> > >> > > >> > ---------------------------------------------------------- > >> > Jim Parziale > >> > Email: nuncio.bitis@... > >> > Malden, MA > >> > ---------------------------------------------------------- > >> > > >> > On 12/6/05, Ake Hedman, eurosource <akhe@...> wrote: > >> > > > >> > > Hi all. > >> > > > >> > > I am trying to enable the watchdog but the result is a total hang > >> of the > >> > > board. Not even the bootloader is possible to reach after the > >> crash and > >> > > I have to reapply power with P0.14 low to get access to the > botloader > >> > > again. Reset is not enough. > >> > > > >> > > The code to initialize the watchdog is > >> > > > >> > > // initialize the watchdog timer > >> > > WDTC = 0xffffffff; // 15000000; // One > >> second > >> > > = 15000000 > >> > > WDMOD = WDEN | WDRESET; // Activate watchdog > >> > > WDFEED = 0xAA; WDFEED = 0x55; > >> > > > >> > > I must have misunderstood the WD functionality. What am I doing > wrong? > >> > > In the above code the watchdog should not trigger until 5 minutes > >> > > elapsed so even if a vector should be wrong the code that follow > >> should > >> > > run for a while but as soon as I write to the WDMOD register I > get a > >> > hang. > >> > > > >> > > /Ake > >> > > > >> > > -- > >> > > --- > >> > > Ake Hedman (YAP - Yet Another Programmer) > >> > > eurosource, Brattbergavägen 17, 820 50 LOS, Sweden > >> > > Phone: (46) 657 413430 Cellular: (46) 73 84 84 102 > >> > > Company home: http://www.eurosource.se > >> > > Kryddor/Te/Kaffe: http://www.brattberg.com > >> > > Personal homepage: http://www.eurosource.se/akhe > >> > > Automated home: http://www.vscp.org > >> > > > >> > > > >> > > >> > > >> > [Non-text portions of this message have been removed] > >> > > >> > > >> > > ------------------------------------------------------------------------ > >> > YAHOO! 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Message
Re: [lpc2000] Problem with watchdog
2005-12-07 by Ake Hedman, eurosource