Re: LPM3 seems to interfere with MSP's ability to restart

Hi

I'm not sure if it is directy related to your issue but one thing I noticed
when debugging targets with MSPGCC is the following.

My program is using Timer A and directly after programming the MSP with
mspdebug the Timer A is not starting up. It is simply not counting. I have
to powercycle the board to have it operate correctly. This happens every
time I program the MSP. Are you by any chance also using Timer A?

Btw have you tried to evaluate the program counter to see where it is stuck?

Best,
Valentin


On Thu, Nov 21, 2013 at 12:51 AM, Andrew McLaren <[email protected]>wrote:

> I'm seeing a bit of a weird situation that I don't really understand. I
> suspect it will be something simple (hopefully just a 'dumb user error'!).
> It affects the ability of the debugger to reload/restart code following an
> LPM3 state.
>
> I've been able to reduce the logic to simply the command that triggers the
> LPM3 state (I'm using C, so its just the LPM3 macro). As expected, the
> command drops the MSP into lpm3, and the logic promptly hangs (there is
> nothing there to exit this). This is running via mspdebug under Eclipse, so
> if I pause the logic, I'll see that it is indeed sitting at the LPM3
> instruction.
>
> If I terminate this and reload the code, all appears normal (the write/read
> messages from mspdebug as it erases and reloads the code seem normal).
> However, when the code is restarted, it appears to hang somewhere - it
> never
> reaches the LPM3 instruction. This appears to have left the target MSP in
> some sort of indeterminate state, and haven't found any way of retrieving
> it
> other than power cycling the target. If I simply restart mspdebug, it
> reports the following (this is using the TI FET, but have also tried an
> Olimex JTAG-TINY with the same end result).
>
> TI3140 device is in boot config, setting active
> Ti3140: TI_OPEN_PORT failed: A device attached to the system is not
> functioning.
> Ti3140: failed to set up port
>
> I guess mspdebug is having issues communicating, and the problem is out
> with
> the target msp. Powering the target MSP off and on clears the problem, but
> haven't found anything else that does.
>
> While the above is obviously contrived, many MSP's live most of their lives
> in LP states, and LPM3 is possibly the most common of these. Any reload of
> code while debugging is highly likely to be from something like LPM3, so
> have to believe its something I'm doing. Any ideas?
>
> Andrew
>
>
>
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