framebuf, text + test

[ladyada]

allow use of adafruit_framebuf if framebuf isnt't available
tested text in the adafruit_framebuf implementation
add a more fully-featured test for framebuf usage

[eighthree]

Hello! I've tested this on a Feather M4 Express with no issues. Example and library seem to work well.

On a trinket m0 I get this error running ssd1306_framebuftest.py as code.py:

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Framebuf capability test - these are slow and minimal but don't requirea special graphics management library, only `adafruit_framebuf`
Pixel test
Lines test
Traceback (most recent call last):
  File "code.py", line 55, in <module>
TypeError: function takes 1 positional arguments but 6 were given

Line 55 looks like:
display.line(corner_from[0], corner_from[1], corner_to[0], corner_to[1], 1)

Earlier today I modified a version of the adafruit_ssd1306 library to test the new adafruit_framebuf library, with only a few line changes:
https://gist.github.com/eighthree/232110a6a35e0d8677eddaea2055560e
This version makes ssd1306_framebuftest.py work without any modifications.

I reckon the error is something else other than what the error message indicates.

[jerryneedell]

The error reported above occurred for me when I had the old "framebuf.py" module on my system. After removing it, it worked. On trinkets, the old framebuf was necessary since the builtin framebuf was not included,

[jerryneedell]

I have tested this on a metro_m4_espress wit ha 128x32 featherwing. For the ssd1306_framebuftest.py I had to change the address to 3c and set the resetpin to None.

[jerryneedell]

worked on my trinket_m0 with oled featherwing.

[jerryneedell]

Tested on a metro_m4_espress and trinket_m0 with an 128x32 oled featherewing -- both ran the test cases without error. Also ran some "old" ssd1306 code on the metro_m4 -- no issues.
Looks good to me.

[jerryneedell]

also tested SPI 132x28 OLED with metro_m4_express -- once I got the pins defined right it was fine ;-)

[jerryneedell]

for some reason - my review went in on behalf of circuitpython librarians. I added @adafruit/circuitpythonlibrarians back as a reviewer

[ladyada]

thanx, yah this superscedes the old framebuf, and i didnt keep the same name since there might be some structural changes