Re: [Mspgcc-users] Q: Reliable check for blown JTAG fuse?

[Chris L. <cli...@gm...>]

Hel...@pr... schrieb:
> 
> When issueing a reset with "msp430-jtag.exe -r" the following happens:
> ( Using MSP430 JTAG programmer Version: 2.3 )
> 
> ----8<----8<----
> Use -h for help
> Cleaning up after error...
> Reset and release device...
> 
> An error occoured:
> Could not reset target (no connection?): Could not access device - 
> security fuse is blown
> ----8<----8<----
> 
> Is this reliable?

looks like you're using the TI backend. so it is their code for their chips.

if you run msp430-jtag with --backend=mspgcc -DDD it runs the code you 
can look at here 
http://mspgcc.cvs.sourceforge.net/mspgcc/jtag/msp430/JTAGfunc.c?revision=1.14&view=markup
line 581 and following

> i mean is it tested with bypass and so on like in "slaa149" on part 4.3
> "testing for a successfully programmed fuse" - or could there be
> another possibility for this same error to happen with fuse okay?

the fuse check needs some pulses on the JTAG interface. when these are 
not correct is the JTAG going into bypass mode. it is doing the same for 
blown fuses and correct pulses. but if you previously were able to use 
the JTAG successfully you have good chances that the check works reliably

chris