Soldering these test boards is a lot of work.
Yesterday I did the power connections on the main board and started with the design of the LCD connection board. A bit of focus was needed there, since with these adapter boards for converting 0.5mm FPC to 2.54mm headers the pins are swapped. 1 becomes 2 and 2 becomes 1, etc.
Last year I already ordered a lot of the needed stuff from aliexpress, including a step up converter with plus and minus 15V output. This because the LCD needs about -6V on one of its pins and 15V and 10V on other pins. Used what I had lying around zener diode wise to make the lower voltages, more or less like what is in the FNIRSI-1013D.
It looks like it is working, but did not get actual intelligent output on the display. When I turn on the Lichee nano with what is in the flash I get a white screen, that turns off an on again at some point and then stays white. Tried a SD card with my scope firmware, but that just results in a black screen. So it needs some investigation. I tried the display in the scope itself and it still works, so that is a plus.
Also need to power the board from a proper 5V supply. The 5V coming from the Lichee nano, at least with the cable I'm using, is only 4.7V. This has some effect on the 15V and 10V output. The measured voltages are ~0.6V lower than in the scope. I'm not sure if this is a problem for the LCD.
Hope to finish the other soldering tomorrow, but this means soldering about 80 lacquered copper wires, which is quite a bit of strain on both the back and the eyes.
Edit: The problem lies in the brightness control on the Lichee nano. Port pin PE6 is used to control the brightness, and in the scope firmware this pin is used in communication with the FPGA. Come to think of it, the scope code checks on the FPGA returning a valid response, which it does not get, so it will not start any way. This means I have to create another project to run on the Lichee nano.