topic Re: How to use watch in opentcp.? in S12 / MagniV Microcontrollers

How to use watch in opentcp.?

IamX — Sat, 18 Nov 2006 03:19:15 GMT

How to use watch in opentcp.?
I have some problem.

Board is still not running.

I will use watchdog for solve this problem.

How to use it.?

Thank you.

Re: How to use watch in opentcp.?

pittbull — Sat, 18 Nov 2006 04:13:05 GMT

Hello,
OpenTCP has a function in 'system.c' that is called 'kick_WD'
When OpenTCP performs lengthy tasks it calls this function.
You can modify 'kick_WD' to satisfy your needs...

Hope that helps,
-> pittbull

Re: How to use watch in opentcp.?

IamX — Sat, 18 Nov 2006 04:28:39 GMT

How to modify Kick_WD() function.?
I never use it.
Thank you for reply.

Re: How to use watch in opentcp.?

pittbull — Sat, 18 Nov 2006 04:39:17 GMT

Hi,
Open 'system.c', locate 'kick_WD' and then change its body...

/* Watchdog refresh */
void kick_WD (void)
{
// Do something here that prevents watchdog from biting
}

Re: How to use watch in opentcp.?

IamX — Sat, 18 Nov 2006 04:46:14 GMT

Thank you pittbull
How to initial it before use kick_wd();
Or
Opentcp code include it.
I can't find initial code for use watchdog.

If you have sample code for use it.

Please suggest me

Thank you

Mr.X

Re: How to use watch in opentcp.?

pittbull — Sat, 18 Nov 2006 05:07:20 GMT

IamX wrote:
I can't find initial code for use watchdog.

Hi,
I don't think that OpenTCP initializes the WD. It's outside the scope of a TCP stack
You should initialize the WD at system startup.
And how this can be done depends on the MCU you are using.
Please see the MCU programmer manual how WD can be activated...

Re: How to use watch in opentcp.?

IamX — Sat, 18 Nov 2006 05:18:15 GMT

Thank you.
You say : It's outside the scope of a TCP stack .

That mean

Opentcp shold be not use watchdog.

If I wrong understand.Please suggest again.

I little english language.

Thank you.

Re: How to use watch in opentcp.?

pittbull — Sat, 18 Nov 2006 05:43:28 GMT

IamX wrote:
You say : It's outside the scope of a TCP stack.That meanOpentcp shold be not use watchdog.

No, I mean OpenTCP should not initialize it because it affects the whole system, not only TCP.
Indeed, OpenTCP must satisfy the WD. Imagine the checksum calculation over a huge packet which eats many CPU cycles...

Re: How to use watch in opentcp.?

Goz — Wed, 29 Nov 2006 23:33:06 GMT

Sorry but you are wrong pitbull, you can run the OpenTCP stack with a watchdog on as I have done so without any problems. You just have to make sure that you kick the watchdog regularly.

To activate the watchdog apply the following code (btw this is in C)

COPCTL = 0x07;

void kick_WD (void) <------- this routine is in system.c

{

ARMCOP = 0x55;

ARMCOP = 0xAA;

}

All you have to do is make sure that you call kick_WD regularly to stop it from resetting the device.

Remember if something goes wrong in the code and you need to debug, you have to remove the COPCTL initialisation line.