EclaireXL

Used this controller for the ADC on v1: https://eewiki.net/pages/viewpage.action?pageId=10125324
So I guess I just need to wire this to the ZPU, then I can experiment with this in firmware.

I guess a write FIFO that captures 16 bits (7 bit address, R/W and data). Then a fifo for the reply. + A way of telling when its all stopped.

Writing some code to say:

select channel1
read selected channel
write to random slave on channel1

select channel0
read selected channel
write to random slave on channel0

Might be working, but need to work out how to check... I guess I can stick the scope in i2c decode mode on the vga or hdmi port (fiddly...) and see if I see anything.

Picoscope has i2c debugging and linux drivers:-) Installed them and will connect that up and take a look tomorrow.

Looking on signaltap looks like slave reads of the control register are not working. Hmmm.

I had the pin assignments backwards. I can now write 4/5 to the control register and read it back. This should be channel select.

Next up... checking that what I write makes it to the VGA and HDMI port. I guess I could try speaking to them. Annoying thing here is I only have one monitor so would need to disconnect it to check!

VGA is working... receiving “00 FF FF FF FF FF FF 00 10 AC …"
Now for HDMI

HDMI is working too... “00 FF FF FF FF FF FF 00 10 AC …

Added to the video settings 'VGA connected' and 'HDMI connected' which look for the start of the DDC sequence '00FF'