RGBtoHDMI
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hoglet67
Always shows unkown clpd
Hello
i soldered my own issue4 board. The clpd is from mouser. The Raspberry Pi w boots and i get the clpd programming menu. I choose RGB and the flashing starts. It takes some time and after that i can see verifying the clpd. Success and the Raspberry reboot after 5 seconds. After rebooting i get the clpd menu again with the message unkown clpd. So it seems the programming went fine but the Pi doesn't recognize the programming and goes to the programming menu again. Do you have any idea what it wrong? What can i do? Thank you
@AlienCargo
Do you have any idea what it wrong?
It's likely that one of the pins of the 12 bit bus connecting the CPLD to the Pi zero is not connected or shorted as those bits pass the CPLD type and version number.
When you are in the CPLD menu, select the Return option to get to the Settings menu then select Return again to get to the main menu. Select the Info menu and use the Save Log and EDID option and post "Log.txt" from the SD card which should give some indication of which bit(s) are the problem.
@AlienCargo
The log shows:
CPLD Design: 6-12_BIT_RGB
CPLD Version: b.4
The top 4 bits of the 12 bit bus specify the CPLD design which is correct and the bottom 8 bits specify the version but that should be 9.4 not b.4 which means bit 5 of the 12 bit bus is stuck high so is either not connected, shorted or damaged.
Bit 5 (Q05) is pin 8 of the CPLD and Pin 26 of the 40 way header (GPIO 7) so check for continuity and shorts around that area. Also check continuity between pin 26 on the CPLD board and pin 26 on the Pi zero PCB
Absolut genius 🥇 It's working fine now with my Apple IIe internal pickup and RGB. The picture is rock stable and pixel perfect. I had a cold solder at the 40 pin header at the RGB board. Thank you again.