Changes to Wireless Paper V1.0 and V1.1 #5
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Implement a missing soft-reset. Change fast refresh border waveform
Implement fast refresh
| void GxEPD2_213_BN::_Init_Part() | ||
| { | ||
| _InitDisplay(); | ||
| _writeCommand(0x3C); // Border Waveform | ||
| _writeData(0xC0); // Floating (less noise-accumulation?) |
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Note border waveform change to 0xC0 - "Hi-Z".
Previous value was 0x05 - "Follow LUT".
This change seems to prevent "static" accumulating on the display border, during fast-refresh.
It would be good to get confirmation that this change is safe and appropriate.
| // Fast refresh waveform is unofficial (experimental?) | ||
| // https://github.com/todd-herbert/heltec-eink-modules/tree/v4.1.2/src/Displays/LCMEN2R13EFC1/LUTs | ||
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| const unsigned char GxEPD2_213_FC1::lut_20_vcomDC_partial[] PROGMEM = |
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To be safe, before opening pull request, I tested the custom LUT by running the Meshtastic carousel (every 20 seconds) for just less than 3 hours.
~500 fast refreshes were performed, between occasional full refreshes (EInkDynamicDisplay). No negative effect was noticed.
The operation is slightly unconventional, but it does seem to produce reasonable results. Would be good to get some confirmation here that this all looks okay, if possible.
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@thebentern meshtastic/firmware#3320, which was merged yesterday, depends on this pull request. I might not have made that clear, sorry. |
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Great work @todd-herbert! Just tested this on a Wireless Paper v1.1 using the master branch of the firmware while pointing this lib to the commit of your repository. Fast updates look very clean and I also can’t reproduce this issue anymore, except when it happens to do a full refresh when sending a lot of packets. For the confirmation of the specific code changes you mention, I would refer to @markbirss. |
DEPG0213BNS800 - Heltec Wireless Paper V1.0
LCMEN2R13EFC1 - Heltec Wireless Paper V1.1
Note: Changes to LCMEN2R13EFC1 will not immediately impact meshtastic/firmware. A further pull-request is required to point lib_deps back at this repo.