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EPD Library for Arduino
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Re: EPD Library for Arduino

by adafruit_support_carter on Mon May 03, 2021 1:07 pm

I'm not seeing that right away either. The actual display update does things that may look like that maybe? That would happen when display.display() is called. But after a few seconds of stuff happening, it should stop and just show the expected contents for ~15 seconds before doing another display change (and seeing similar stuff happen each time).

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Re: EPD Library for Arduino

by mamcgu on Mon May 03, 2021 5:39 pm

I believe you are right. Thanks again. Seems like the software has to coax these tiny beads into the right position with many urges.

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Re: EPD Library for Arduino

by JoeV2370 on Sat May 15, 2021 5:43 pm

I have a 2.9" Graysacle E-ink Featherwing plugged into a Feather M0 Basic Proto. The ThinkInk_gray4 example works fine with the _290_ object instantiated and with EPD_BUSY and EPD_RESET set to -1, but the ThinkInk_partial example doesn't work unless I also set SRAM_CS to -1 (and insert a delay at the end of loop()). If I leave SRAM_CS set to 6, the fourth character becomes just a blob of noise.

My conclusion from the _gray4 example is that all the hardware, including the SPI RAM is working fine, so the failure with the _partial example must have something to do with the EPD library displayPartial sram code, which is way over my head. Any thoughts on this? I will need the extra ram for my project, so if I can't get the SPI sram to work I'll have to upgrade to a Feather M4.

I'm using Adafruit_EPD 4.4.0, but this version is perhaps suspect since the the commented-out code at the end of loop() in ThinkInk_partial really needs that delay(3000), and the fillRect() works with EPD_LIGHT, not EPD_WHITE.

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Re: EPD Library for Arduino

by adafruit_support_carter on Mon May 17, 2021 11:00 am

@JoeV2370 Please start a new thread for your question.

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Re: EPD Library for Arduino

by JoeV2370 on Mon May 17, 2021 12:32 pm

Would love to start a new thread, but have looked all over and can't find how to do that. Can't even find a "help" topic.

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Please be positive and constructive with your questions and comments.