--- Quote Start ---
Yes I can control the chip select. I'll certainly give that a try, set CS high during power up and then set it low after a few clock cycles.
--- Quote End ---
Sounds like a good debug plan.
--- Quote Start ---
What bothers me is I never fail to read the correct default value of a register.
--- Quote End ---
Never try to interpret patterns, you'll never figure them out.
--- Quote Start ---
For now I have to change the address value in my VHDL code, re-compile the code, and re-program the FPGA. I would think a read would be more difficult to accomplish since the SDIO line has to change from an input to an output whereas for a write, it stays as an input line.
--- Quote End ---
You need to write an ADC interface controller, wrap it with a Avalon-MM registers interface, drop it into an SOPC or Qsys system, and then debug. That way you can generate reads or writes to whatever addresses you like.
It may seem like a lot of extra work up front, but you'll benefit from it in the long run. Go through this tutorial:
http://www.alterawiki.com/wiki/using_the_usb-blaster_as_an_sopc/qsys_avalon-mm_master_tutorial Cheers,
Dave
Honored Contributor
