I assumed that the 7i90hd would recognize SPI
directly, like the 7c81 does. Do I have to go
dig up a parallel port computer from somewhere
and get at least mesaflash running on it just
so I can get spi working for the pi? That is an
unfortunate hurdle. I don't see anything in the
manual about needing to load the correct bitstream
over parallel in order to use spi. In fact, I read
this in the manual:
"Linux and Windows utility programs mesaflash and mesaflash.exe are provided to
write configuration files to the 7I90HD EEPROM via the RS-422 interface and
LBP16. The
linux utility can also write configuration files via the EPP interface. These
files depend on
a simple SPI interface built into both the standard user FPGA bitfiles and the
fallback
bitfile."
I can tack on a pullup to SDO. I have put four
scope probes on the four signals, and see data
when interrogating the 7c81, but not the 7i90hd.
The clock from the pi is correct.
Thanks again.
-- Ralph
________________________________________
From: Peter C. Wallace [p...@mesanet.com]
Sent: Thursday, January 7, 2021 3:18 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd
Looks right
2 layer should be fine as long as the ground is solid (wide)
between the 7I90 and the RPI (and lo longer than a couple of
inches
You might try adding a pullup to SDO (7I90 15) to see if you read
0xFFFFFFFF which would indicate the the 7I90 is not driving SDO
Sure you have a SPI config in the 7I90?
Peter Wallace
Mesa Electronics
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