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Is sending more than 19 bytes of data possible with the EZ430 Chronos?

Mike Eng
Prodigy 190 points
Other Parts Discussed in Thread: SIMPLICITI

I have been trying to send more than 19 bytes of application data from the AP to the EZ430 Chronos for days without sucess (even 20 bytes fails)

For example, for just 1 more byte (i.e. 20 instread of 19), I modified -DMAX_APP_PAYLOAD to 20 (was 19) in smpl_nwk_config.dat, SIMPLICITI_MAX_PAYLOAD_LENGTH to 33 (was 32) and BM_SYNC_DATA_LENGTH to 20 (was 19) in simpliciti.h for packet handling in both the AP and Chronos code, recompiled, flashed and confirmed sucesfully to both devices.

As before the Chonos is able to Join and Link to the AP, but when I send a 20 byte packet, it is never received by the Chronos. Remember, the exact same code with a 19 byte payload works fine - and the theoretical limit for the EZ430/CC1111 radsios should only be around 50bytes.

With our packet sniffer we can confirm that the 20 byte playloads being transmitted in well fomed SimpliciTI packets as they should.

So why isnt the Chronos recieving the packets? Is there some radio specified size limit I'm not aware of, or some un-matched check on packet sizes I cant find in the code? It looks like the radio VECTOR into the radio_ISR(void) function works fine for the JoinAck and LinkAck messages, and TX works fine, but 20 byte incomming packets are simply lost somewhere along the line.

Has anyone been able to send application payloads larger than 19 bytes using the EZ430 Chronos and its CC1111 AP? If so, please let me know how, and if its not possible, please let me know why. Many thanks :-)

(P.S. Duplicate post in SimpliciTI forum here http://e2e.ti.com/support/low_power_rf/f/156/t/132016.aspx)

  • 0
    Guru 227245 points

    I remember an older thread in which this was discussed. Perhaps if you do some forum search...

    IIRC there were some more non-obvious defines to change.

  • 0 in reply to Jens-Michael Gross
    Prodigy 190 points

    Thanks for the feedback Jens-Michael

    I had already extensively searched this, the SimpliciTI, forum, and a heap of other references before posting (I manage two forums myself and cant stand when folks dont search and the answer is obviously available :-))

    Ive searched again just in case I missed something - perhaps you might remember a few keywords about the relevant post or "non-obvious defines" that might bring it to the surface?

    Again, sincere thanks for your help :-)

  • 0 in reply to Mike Eng
    Guru 227245 points

    I tried these keywords that came in mind myself and found the thread I was remembering.

    However, I don't know whether it will help you.

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