Framebuffer Inheritance

peterhinch / micropython-font-to-py

A Python 3 utility to convert fonts to Python source capable of being frozen as bytecode

MIT License

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Framebuffer Inheritance #15

Closed pacmac closed 5 years ago

pacmac commented 5 years ago

Hi Peter;

Just tried to get some old epaper code working and are having trouble with the writer class:

MicroPython v1.9.3-1740-g4fdc731ef-dirty on 2019-04-12; PYBD_SF2W with STM32F722IEK
Type "help()" for more information.
>>> from writer import Writer as w
>>> w.set_textpos(0,0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "writer.py", line 55, in set_textpos
  File "writer.py", line 45, in _get_id
ValueError: Device must be derived from FrameBuffer.

peterhinch commented 5 years ago

What device driver are you using? As stated in WRITER.md

These classes facilitate rendering Python font files to displays where the display driver is subclassed from the framebuf class.

It looks as if your device driver does not meet this criterion.

pacmac commented 5 years ago

Apologies, I was calling the writer wrongly.