OSError: [Errno 90] Message too long on Raspberry Pi4 about pylepton HOT 3 CLOSED

SOLUTION:

The problem is in the SPI buffer size. The default value is 4096 but 160x120 images from Lepton3 are bigger.

You need to increase the size of the SPI buffer as explain here

Edit /boot/cmdline.txt and add in the end:
spidev.bufsiz= 65535

Then reboot your raspberry and check it worked with:
cat /sys/module/spidev/parameters/bufsiz

Hope it works for you also. Maybe this information should be in the README setup tutorial

Hi,
Thank you for your solution. I have tried this but the I couldn't change the buffer size. However, I solved this the opposite of your solution which is by reducing the message size of the library. SPIDEV_MESSAGE_LIMIT = 24 to 8 of Lepton.py. I hope this helps someone.

from pylepton.

SOLUTION:

The problem is in the SPI buffer size. The default value is 4096 but 160x120 images from Lepton3 are bigger.

You need to increase the size of the SPI buffer as explain here

Edit /boot/cmdline.txt and add in the end:
spidev.bufsiz= 65535

Then reboot your raspberry and check it worked with:
cat /sys/module/spidev/parameters/bufsiz

Hope it works for you also. Maybe this information should be in the README setup tutorial

from pylepton.

I have the same error.
raspberrypi_video from LaptonModule is also working for me but not this library.
I am using Lpeton 3.5 with breakoutboard v2.0 on Raspberry Pi 4.

OS: Raspbian Buster
Kernel: 5.4.72-v7l+
Python: 3.7.3

Any solution?

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