micropython pyboard 1.1 EIO error with write function

[katkinsk]

Currently: def write(self, command=None, data=None): """SPI write to the device: commands and data""" self.cs_low() if command is not None: self.dc_low() self.spi.write(bytes([command])) if data is not None: self.dc_high() self.spi.write(data) self.cs_high()

Was able to fix it to work by changing to: if data is not None and data != b'':

Both regular nulls and empty byte strings are passed to the function.

[devbis]

You've mentioned the problem that relates to the way how SPI methods work. I don't think it is an issue in the library as it depends on the arguments you provide for the method and it could be prepared before writing to SPI

display.write(command, data=payload or None)

[katkinsk]

I am not completely sure what you mean, but let me clarify it fails on the init method, so I haven't begun to write anything to the display yet at this point.

I had a similar problem with a different display (ssd1331) but to fix that one all I had to say was "if data != b''" instead of "if data is not None", but in this case when the display is initializing it is being sent both nulls and empty byte strings.

[devbis]

Could you please provide your code to show how you initialize the display to let me check the issue

[katkinsk]

from display import st7789py from pyb import Pin, SPI spi = SPI(1, SPI.MASTER, baudrate=40000000, polarity=1) display = st7789py.ST7789(spi, 240, 240, dc=Pin('X3', Pin.OUT_PP), reset=Pin('X4', Pin.OUT_PP)) display.init()

[devbis]

Fixed in the commit 6ed627bdc876e0f6741682764871ffce83f2762d. Thanks for the report.