Here I go replying to myself again.
I have had some success with loading the firmware. I has a suspicion
that I needed to twiddle the GPIO pins but could not get it to work.
Studying the xc3028 driver showed me the way. The GPIO needs to be
first cleared and then set before continuing.
The xc3028 is very similar to the xc2028 and they could use a common
driver. I don't understand how the firmware file is stored for the
xc3028 though. I assume that multiple chunks are encoded into one file
somehow.
There is also another firmware chunk which is needed for FM radio
support so I don't know how that would be added.
Anyway, I have loading firmware but still no TV. I think I am close though.
i2c traces and firmware can be downloaded from here
http://www.chrysocome.net/downloads/t750-logs-0.1.tar.gz
I'll try and clean up my code and post a patch tomorrow.
John.
John Newbigin wrote:
I have made some slow progress with the T750. I have implemented
loading the firmware for the CX2028 but I have hit a problem.
After loading the firmware, there are some commands (known as the
'MAGIC VALUES') which need to be issued. These are the same as for
the CX3028. After this final write, my card does another write and
then a read, but when I attempt the final read command the chip locks
up and returns BUSY.
Once this happens, the card has to be powered off to reset everything.
Can anyone offer some suggestions of things to try. I have the
feeling I am very close.
I have i2c traces if anyone wants to see them but they are quite large.
John.
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