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adafruit / Adafruit_SSD1306

Arduino library for SSD1306 monochrome 128x64 and 128x32 OLEDs
http://www.adafruit.com/category/63_98
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I2C speed in library overrides sketch #172

Closed gonzob closed 4 years ago

gonzob commented 4 years ago

With the current library, specifying in the sketch: Wire.setClock(400000); has no effect, because the SSD1306 library overrides the sketch. It allows 400kHz ONLY while communicating with the display, and then drops the speed to 100kHz. I have the SSD1306 and two MPR121 units on the same I2C bus, and I can only communicate with the MPR121s at 100kHz.

The fix, I discovered, is to re-write the offending line in the library, but it would be better to have either a setting (eg: display.setClock(xxx)), or for the library to detect that the code has specified another speed and allow it.

Thanks

Gonzo

ageppert commented 4 years ago

@gonzob I think #172 is resolved because the constructor optionally allows specifying a clock speed to use during/after the writes to the SSD1306 device. It's in the comments around lines 130-160 in Adafruit_SSD1306.cpp. I believe this issue can be closed.

gonzob commented 4 years ago

Thanks Andy.

I found it now.

Please close.

Gonzo