adafruit flexible 2.13'' epd not working

[waggykitty]

I'm trying to use the Adafruit flexible 2.13'' epd on the particle xenon with this library and Adafruit_GFX_RX library but the screen doesn't display the text. It flickers when I use the display method but it doesn't display the text or lines that I want it to. I was wondering if anyone might be able to help? attached is my .ino file. Xenon_screen_test.zip

[jasonthenderson]

I am having a similar problem, I've got a Boron and am using the 2.13 monochrome Featherwing and it isn't working for me. Some weird patterns show up, but the text never appears. @waggykitty did you ever get this to work for you? I just used the sample code off of the featherwingtest from @rickkas7 as well as modified code from the Adafruit site.

[rickkas7]

Sorry, I apparently lost a bunch of Github notification emails. I updated the 2.3.0 of Adafruit_EPD. IT was 1.3.0. This may help.

[karlg100]

I'm having similar issues as well, even with 2.3.0. Using the 1.54" mono EPD on a Xenon.

https://www.adafruit.com/product/4196

using the Adafruit_EPD example, got some screen refreshes, and odd lines. But using the even simpler examples, just refreshes black->white->black->white->black and nothing else happens.

Looks like there was report of a similar issue back in Jan on the upstream, but appears that was fixed and I assume that was pulled in with the 2.3.0 update?

[karlg100]

I'm actually going to open new issue since it's a different display.

[jasonthenderson]

Hey Karl, that is the same behavior I’m seeing with my Boron and the 2.9 + breakout, even with the latest update that Rick pushed.

On Tue, Dec 31, 2019 at 3:16 PM Karl G notifications@github.com wrote:

I'm actually going to open new issue since it's a different display.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/rickkas7/Adafruit_EPD_RK/issues/1?email_source=notifications&email_token=ABVTMG4HZ6K7GVUVUSYO2UTQ3PACZA5CNFSM4H4GBSOKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEH4XXYA#issuecomment-569998304, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABVTMGY6AS2LPJZWSHYR4STQ3PACZANCNFSM4H4GBSOA .

[karlg100]

sounds good. I've forked it and going to pull the Adafruit_EPD upstream, and see if I can find the issue.

[karlg100]

so based on my first pass observations, it appears part of our problem is the SPI interface on the mesh products.

looking at the SPI output on an scope, I think we're running too hi freq. also, the default now for the particle firmware is mode 3, which mode 0 I think is what the EPD is expecting.

I can at least now change the fillScreen color. see if this works for you.

void setup(void) {
  display.begin(true);
  SPI.begin();
//  SPI.begin(SPI_MODE_MASTER);
//  SPI.setBitOrder(MSBFIRST);
  SPI.setClockDividerReference(SPI_CLK_ARDUINO);
  SPI.setDataMode(SPI_MODE0);

  Particle.publish("Stat", "Initialized");
}

void loop() {
  display.clearBuffer();
  display.fillScreen(EPD_WHITE);

  // still doesn't draw anything
  display.drawPixel(display.width()/2, display.height()/2, EPD_BLACK);
  display.display();
  Particle.publish("Stat", "Display Updated white");
  delay(5 * 1000);

  display.clearBuffer();
  display.fillScreen(EPD_BLACK);
  display.display();
  Particle.publish("Stat", "Display Updated black");
  delay(5 * 1000);
}

[jasonthenderson]

Thanks a lot Karl, traveling until Friday- will try this as soon as I get back.

On Tue, Dec 31, 2019 at 7:43 PM Karl G notifications@github.com wrote:

so based on my first pass observations, it appears part of our problem is the SPI interface on the mesh products.

looking at the SPI output on an scope, I think we're running too hi freq. also, the default now for the particle firmware is mode 3, which mode 0 I think is what the EPD is expecting.

I can at least now change the fillScreen color. see if this works for you.

void setup(void) { display.begin(true); SPI.begin(); // SPI.begin(SPI_MODE_MASTER); // SPI.setBitOrder(MSBFIRST); SPI.setClockDividerReference(SPI_CLK_ARDUINO); SPI.setDataMode(SPI_MODE0);

Particle.publish("Stat", "Initialized"); }

void loop() { display.clearBuffer(); display.fillScreen(EPD_WHITE);

// still doesn't draw anything display.drawPixel(display.width()/2, display.height()/2, EPD_BLACK); display.display(); Particle.publish("Stat", "Display Updated white"); delay(5 * 1000);

display.clearBuffer(); display.fillScreen(EPD_BLACK); display.display(); Particle.publish("Stat", "Display Updated black"); delay(5 * 1000); }

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[karlg100]

Well, after spending a few hours looking at this, I'm not much from where I started, and giving up for now.

It does appear there's SPI compatibility issues with Particle, and I see that the Adafruit libraries rely on certain flags to exist, like SPI_HAS_TRANSACTION. https://community.particle.io/t/ssd1305-issues-on-spi/50958/14 https://github.com/particle-iot/device-os/issues/1668

On the other hand, the Adafruit software SPI (avoiding using the SPI particle implementation) doesn't work either. Which leads me to believe there's some other issue. I don't have a non-particle board to test (nor the patience at this point) to see if I can even get this display to work on another platform.

Nonetheless, I think there's more work that needs to be done here, and I don't have the skills or time to figure out what. Perhaps @rickkas7 can take a look and figure out what's wrong.

[jasonthenderson]

@rickkas7 it would be great if you could take a look. I even found the epd feather wasn’t working with my Boron, that should be pretty easy to reproduce since I think you initially tested with the Epd feather.