Unicornhatmini library broken following the last raspberry update

[Cthuga]

Hello,

Just updated the raspberry pi 4 to the last update this morning, since then :

File "/usr/local/lib/python3.7/dist-packages/unicornhatmini-0.0.1-py3.7.egg/unicornhatmini/init.py", line 56, in init SystemError: error return without exception set

I tried to reinstall it, but the error stays.

Could you look into it?

[Gadgetoid]

What are you running when you encounter this error?

Looks like line 56 is something to do with setting up SPI, in this case changing the polarity of chip select:

https://github.com/pimoroni/unicornhatmini-python/blob/39bd7e1e685c4497081279c22939f578ca30f969/library/unicornhatmini/__init__.py#L56

Could potentially be a bug with the system itself, or maybe this was just never fully supported.

Is this the latest Raspberry Pi OS, or is it the Raspberry Pi OS 64bit beta?

[Cthuga]

Nothing much. It happend as soon, I try to define an object from unicornhatmini import UnicornHATMini unicornhatmini = UnicornHATMini()

I'm using the latest Pi OS not the 64bit.

It was working fine this morning, I did : sudo apt update sudo apt full-upgrade sudo reboot

And after that my python program would not work anymore.

[Gadgetoid]

I'm not sure if this is a bug in Python SpiDev or a bug in the new Raspberry Pi 5.x kernel. I am looking into it and have reported it upstream here- https://github.com/raspberrypi/linux/issues/3745

[Gadgetoid]

Not sure if cshigh = False is actually necessary, or if it's the default, but omitting this line allows the library to work on 5.x. Patch:

diff --git a/library/unicornhatmini/__init__.py b/library/unicornhatmini/__init__.py
index 8cae250..d76204c 100644
--- a/library/unicornhatmini/__init__.py
+++ b/library/unicornhatmini/__init__.py
@@ -53,7 +53,7 @@ class UnicornHATMini():

         for device, pin, offset in self.left_matrix, self.right_matrix:
             device.no_cs = True
-            device.cshigh = False
+            # device.cshigh = False
             device.max_speed_hz = spi_max_speed_hz
             GPIO.setup(pin, GPIO.OUT, initial=GPIO.HIGH)
             self.xfer(device, pin, [CMD_SOFT_RESET])

[Cthuga]

Thanks you for your help. I made the comment as sugested, everything is back to normal.

Thanks again.