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Cannot connect to F28335 after programming flash

Peter Harrington
Prodigy 10 points


Can Ya'll hep me out? 

I programmed this here F28335 eZdsp board and was following the bi-structions in http://focus.ti.com/lit/an/spra958h/spra958h.pdf. 

Now I can't seem to connect to the board anymore.  I blamed it on Steve Balmer and Widows Vista, but even after reinstalling code composer it does not work.  Then I tried it on my coworker's computer and the board does not work there either. 

Can anyone tell me how to get this here eZdsp thingamaging working again?  I'd apreciate it if ya'll could hep me out, I'd even buy you a PBR. 

Pete

  • 0
    TI__Guru* 93270 points

    Peter Harrington said:

    I programmed this here F28335 eZdsp board and was following the bi-structions in http://focus.ti.com/lit/an/spra958h/spra958h.pdf. 

    Now I can't seem to connect to the board anymore. 

    Peter,

    I'm wondering if you happened to program a value into the CSM password?   If so then first configure the device boot mode pins in the "wait" boot mode.  It is called "loop to checkmode" on 2833x.  Then power the device and try to connect CCS.   What can happen is when you power the device the CPU will start executing the code.  Most likely this will go off into the flash area.  If there is a password programmed it will also disconnect the JTAG for security.  By using the "wait" boot mode you can keep the CPU from going off into secure memory and tripping this security measure.

    -Lori