SSD1306 driver is reported as incompatible device driver.

[DusKing1]

Hi, thanks for your great job! I really like this micro-gui framework.

But when I'm trying to use it on a 128x64 SSD1306 I2C display, I got:

  File "main.py", line 34, in <module>
  File "main.py", line 32, in test
  File "gui/core/ugui.py", line 305, in change
  File "main.py", line 19, in __init__
  File "gui/core/writer.py", line 261, in __init__
OSError: Incompatible device driver.
MicroPython v1.19.1 on 2022-06-18; ESP32 module with ESP32
Type "help()" for more information.

I copied all necessary .py scripts (I think), my file structure is like this:

My hardware_setup.py is

from machine import Pin, I2C, freq
import gc
from drivers.ssd1306.ssd1306 import SSD1306_I2C as SSD
freq(240_000_000)
i2c = I2C(0, scl=Pin(22), sda=Pin(21), freq=1_000_000)
gc.collect()
ssd = SSD(128, 64, i2c)
gc.collect()

from gui.core.ugui import Display, quiet

nxt = Pin(34, Pin.IN)  # Move to next control
sel = Pin(32, Pin.IN, Pin.PULL_UP)  # Operate current control
prev = Pin(35, Pin.IN)  # Move to previous control
increase = Pin(33, Pin.IN, Pin.PULL_UP)  # Increase control's value
decrease = Pin(25, Pin.IN, Pin.PULL_UP)  # Decrease control's value
display = Display(ssd, nxt, sel, prev, increase, decrease)

and my main.py is:

import hardware_setup  # Create a display instance
from gui.core.ugui import Screen, ssd

from gui.widgets import Label, Button, CloseButton
from gui.core.writer import CWriter
# Font for CWriter
import gui.fonts.arial10 as arial10
from gui.core.colors import *

class BaseScreen(Screen):

    def __init__(self):

        def my_callback(button, arg):
            print('Button pressed', arg)

        super().__init__()
        wri = CWriter(ssd, arial10, GREEN, BLACK, verbose=False)

        col = 2
        row = 2
        Label(wri, row, col, 'Simple Demo')
        row = 50
        Button(wri, row, col, text='Yes', callback=my_callback, args=('Yes',))
        col += 60
        Button(wri, row, col, text='No', callback=my_callback, args=('No',))
        CloseButton(wri)  # Quit the application

def test():
    print('Simple demo: button presses print to REPL.')
    Screen.change(BaseScreen)  # A class is passed here, not an instance.

test()

[DusKing1]

NVM, I have a quick fix in my PR.

[peterhinch]

Thanks for the clear report. The CWriter class is intended for color displays with Writer being the monochrome equivalent.

While your mod will probably work fine, the way it is supposed to be used with a monochrome display is as follows. In main.py:

# from gui.core.writer import CWriter
from gui.core.writer import Writer  # Monochrome writer

and in your code wherever you need a Writer:

wri = Writer(ssd, arial10, verbose=False)  # No colors specified

Please could you try this and report back. I'll review the docs.

Incidentally you don't need to copy the entire drivers tree to your device - although the unused drivers only consume Flash space.

[peterhinch]

I've updated the example code in README.md to clarify usage with monochrome displays.

[DusKing1]

Thank you for your reply, I'll test it according to your suggestion once I back to my test hardwares, like next Thursday or later.

[DusKing1]

Hi, I just tested on my own hardware and your solution works for me. Related PR closed. Thank you for your awesome work!