Hello list,

 

I try to use the jtag interface of the debug brick with a Olimex ARM-USB-OCD-H interface and openocd, but the dc brick is not recognized.

Openocd gives:

    ......

Error: JTAG scan chain interrogation failed: all ones

Error: Check JTAG interface, timings, target power, etc.

Error: Trying to use configured scan chain anyway...

Error: sam3.cpu: IR capture error; saw 0x0f not 0x01

    ......

 

Is there anything wrong? Has anyone used the jtag interface?

  Regards,

      Sietse

 

Did you remove the "#define DISABLE_JTAG_ON_STARTUP" in config.h? We have to disable JTAG in the production firmwares, since some of the JTAG pins are dual purpose und used for other things.

  Hello List,

 

I did remove the DISABLE_JTAG_ON_STARTUP, but the problem remains the same.

Using a master brick instead of the DC brick DOES work however.

So, what else could be the problem, apart from hardware?

The DC brick works OK for the rest.

  Thanks in advance,

    Sietse

 

Do you get some kind of error message? Did you configure the correct microcontroller (atsam3s4c vs atsam3s2b)?

Hello,

Don't ask me why, but I tried again, and now both bricks work with

jtag debugging. (there we no errors/warnings earlier)

Sorry to bother you,

  regards,

    Sietse