Difference between revisions of "Interprocessor (51-51d) protocol FAQ"

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The 51d program running on the 7312 and the Winbond '51 chip communicate over /dev/ttyS1 at 115200 bps.
 
The 51d program running on the 7312 and the Winbond '51 chip communicate over /dev/ttyS1 at 115200 bps.
   

Revision as of 21:15, 26 June 2005


The 51d program running on the 7312 and the Winbond '51 chip communicate over /dev/ttyS1 at 115200 bps.

Here is what we know so far about the communications protocol:

  • Heartbeat:

If the Winbond chip does not see a "heartbeat" signal every xx seconds, it will kill power to the 7312 and reboot it. It's a two-part sequence:

7312 > 0x70
       0xAC   < 51
     > 0x90
       0xCE   < repeats