lfrey The oled works on my arduino (but I don't know why it doesn't use the MISO pin)
If you are just sending data to the display and you do not read from it, then the MISO (main in, secondary out) is not needed.
lfrey The errors disappeared after I updated to latest bela version. Bela wasn't running.
When you had those errors Bela was running. Could you try - on this updated version - running the Bela program in the IDE and, in a terminal, your python script? Does this systematically cause the Bela program to error and stop?
lfrey Ok but 2_25 & 2_27 are D10 and D11, isn't there a conflict ?
config-pin
will make sure they have an SPI and not a GPIO function, so anything Bela does to D10/D11 will not affect the signal on the pins.
no, we do that all the time.
How do you run the Python program on the board?