Hi!
We are currently trying to use the serial Digilent PmodCLS LCD with the SPI bus
on a TS-7400 64mb version. The PmodCLS is a serial LCD including it's own
microchip, so we only need to send ASCII characters on the SPI bus, and
everything else is handled by the LCD.
PmodCLS ->
http://www.digilentinc.com/Products/Detail.cfm?NavPath=2,401,473&Prod=PMOD-CLS
Currently, it's working really fine with the 32mb version of the card, we can
write on the CPU's registers of the SPI bus, and everything shows up fine on
the LCD...
However, as soon as we move to the 64mb version of the card, there is some
messup... Even though the card seems indentical, same CPU and everything else
seems identical except for the extra memory chip, it doesn't work well...
I can assure you that the issue is hardware related... We've also tryed using
the same SD card with the exact same OS on the 32-bit and 64-bit version...
half the times, it simply does nothing on the LCD, the other half is splitted
in two... some time writing the last character of the string I was sending, or
in the second case, the last character of the last attempt followed by the
first character of the current attempt....
Never more than two characters, and it seems really slow in execution, compared
to the 32mb version. Looking on an oscilloscope, we can clearly see that the
LCD obey what it is sent... Only one, two or zero characters are sent,
electrically, to the LCD so it isn't the issue!
So, Is there any difference at all between the 32Mb version and the 64Mb
version that isn't visible to the naked eye?
Or does anyone have an hypothesis on what the problem could be?
All I know, is that I base my C code on the temp_sensor example, and followed
the documentation of the CPU thoroughly for initialisation and operation
Any help would be greatly welcome!
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