[E3-hacking] E1

[Jas Strong]

If it was SPI, it'd have two data lines, not just one (MISO and MOSI).

My guess is that it's I2C.

-J.

David Given wrote:
> Ralph Corderoy wrote:
> [...]
>   
>> I suspect it's more primitive than the E2's PBL so I doubt a passkey is
>> required.  Request 00 always replies with a NAK in PBL V3.1 but perhaps
>> it does something useful in the earlier version and was changed to be a
>> constant NAK later?  Do you get anything from request 01?
>>     
>
> I haven't tried 01 specifically, but pblq pings stuff with request 02
> (GETVERSION) on connect, and I don't get any response. I'm not receiving
> *anything* from it, not even the 0x06 when PBL interrupts the boot sequence.
>
> At this point I suspect I definitely need a capturing scope to try and
> see if anything at all is coming out. Alas, they're not cheap.
>
> Incidentally, I also took the lid off the Pocket Dockit. As expected
> it's calculator technology --- ICs glued directly to the PCB with resin
> blobs poured on top --- but I do notice a bunch of pads labelled Vdd,
> GND, RESET, SDAT and SCLK. SPI, perhaps? There may even be a real PIC
> under there...
>
>   
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