7i73 LCD shows rubisch

Mike_Eitel wrote:

BUT absolutely not explicable for me on 4. screen letter D plus jumping F.
There is no letter F in my declaration !!!

I think that the only explanation is that your LCD is haunted.

(I have absolutely no way to explain that)

Can you halscope the lcd.out pin and see if it is actually taking the "F" value?

Mike_Eitel wrote:

I have several lcds and quite some years of expierience programing them with avr's. And also for me it is very strange that a hex character augments by one.

If the last page contains "D" and you see "F" then it has incremented by two.

May i asking you how sserial bus works. Is it a protocol with crc. Or is it a simple fifo bit shifting. ( What explains you request of halscope )

I am not 100% sure of the details of the smart-serial protocol at the data-line level.

However the lcd component outputs one character every servo thread cycle from the format string, and that is passed to an input pin in the smart-serial driver. The driver then sends this byte to an FPGA register via the PCI / Ethernet / other bus.
The FPGA should then detect the register write and sends the data to the CPU on the 7i73, which converts it to an LCD driver protocol.

So there are many steps in this chain where something could be going wrong.

Anyhow i will make a halscope and a Video auf YouTube it tonight.

Don't bother with the video, but a halscope of the output of the LCD component would be useful. (You can save the data to a file, I can then analyse the file).

If the lcd component data looks correct then we have at least eliminated one possibility.

The evidence seems to be that it works with PCI but not Ethernet, so far at least. (Which would also tend to suggest that the problem is not with the lcd component)