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CC8520 Bootloader unlock problem

Bill Hermann
Prodigy 10 points

Other Parts Discussed in Thread: CC8520

I am writing code for a standalone production programmer for the CC8520 chips and am running into problems with communication. I can successfully execute a BOOT_RESET and read status word of 0x8021 (waiting for BL_UNLOCK_SPI()). When I issue the BL_UNLOCK_SPI() command, however, I always read status of 0x0022 (unlocking failed) afterward. I can't find what I might be doing wrong with this. I have observed the BL_UNLOCK_SPI() sequence on a 'scope and have verified the correct bit-sequence is being issued. I have tried various delays after issuing the unlock command before reading the status word, as well as looping to periodically check the status word, but I always read 0x0022. Has anyone else encountered such a problem?

  • 0
    Intellectual 385 points

    I sympathize!  I think the thing I tried was using the SPI software reset as opposed to the reset pin (or vice versa maybe).  One worked better than the other for me (I never figured out why).

  • 0 in reply to Susan Williams
    TI__Mastermind 21125 points

    Hi Bill, 

    Can you verify that you are not doing anything after issuing the BOOT_RESET prior to the unlock command?
    If you can confirm this, can you please post a analyzer capture for the unlock command and if possible also the code that you are using?

    We are working on updating our EHIF library code and this will include a example that covers this as well. Hopefully we are able to post this in a few weeks. 

    Best regards, 
    Kjetil