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.
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