[SOLVED] 64x32 LED matrix not working with HAT + Pi2

[jwheare]

Here's what the signal on the OE- and CLK pins looks like with everything plugged in and the led-matrix demo running:

https://www.youtube.com/watch?v=tUajaw7x_Xw

I've tried with a new IDC cable and a fresh install of a raspbian jessie image on a formatted SD card, and have been discussing the issue with the author of the led-matrix software here:

https://github.com/hzeller/rpi-rgb-led-matrix/issues/90

It looks to me like the LED panel itself may be faulty, but let me know if I should take any more readings with the scope to confirm.

[adafruit2]

is there a reason you aren't just using our code?
https://learn.adafruit.com/adafruit-rgb ... g-matrices

[jwheare]

Actually that's exactly the code and tutorial I'm using, except with the upstream code which is much more up to date, works better and explains the essential RGB_SLOWDOWN_GPIO flag to avoid image corruption on the Pi 2.

With the help of the upstream author of that code I diagnosed the problem was that GPIO pin 22 on my Pi was stuck at 1. I bought a new Pi and everything is now working beautifully.

I suggest you update the tutorial to point to hzeller's upstream code, or at least update your fork.

I'd also recommend mentioning the modification described here to make use of the PI's PWM hardware: https://github.com/hzeller/rpi-rgb-led- ... 7395760d01 using it completely eliminates flickering in the LED panel. Even better if a connector could be included with the HAT to make this modification even easier!

Thanks for all the help. This thread can be considered resolved now.

[adafruit2]

yah we're looking into it (the sped up version)

ill be honest i would not have guessed it was a busted GPIO pin on your Pi!