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Re: [ts-7000] How to do soft shutdown with watchdog timer?

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Subject: Re: [ts-7000] How to do soft shutdown with watchdog timer?
From: Jim Jackson <>
Date: Wed, 9 Mar 2011 13:09:41 +0000 (GMT)


On Tue, 8 Mar 2011, Rekcut_Nod wrote:

> I'm using a TS-7260.  I monitor a DIO line for the user to shutdown the 
> system, at which point I want to close all open ports and devices, and 
> issue a "shutdown -h now" command via popen (I'm writing c code).
> 
> My question is, if the watchdog is initialized and fed by:
> 
> int fd = open("/dev/mem", O_RDWR|O_SYNC);
> volatile unsigned char *wdt_control;
> volatile unsigned char *wdt_feedl;
> 
> wdt_control = (unsigned 
> char*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x23800000);
> wdt_feed = (unsigned 
> char*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x23C00000);
> 
> *wdt_feed=0x05;
> *wdt_control=0x07;//set duration to max = 8 seconds
> 
> how can I call fclose(fd)?

You just need to need to disable the watchdog - *wdt_feed=0; 
then it will not interfer with your shutdown regime.

> I don't want the watchdog to reset the board 
> before the "shutdown -h now" is finished, nor do I want the program to be 
> terminated by the shutdown command before I've safely released /dev/mem. 
> Any suggestions?
> 
> 


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