2.13" e-paper display

[MBB]

I have this e-paper display:
https://www.seeedstudio.com/Grove-Triple-Color-E-Ink-Display-2-13-p-2889.html?queryID=7ea48faba49bb43929b744ee897a794d&objectID=2889&indexName=bazaar_retailer_products

This display uses a UART interface.

GCB supports a SPI interface.

Did I buy the wrong display or is there a way to make this work with GCB?

[Anobium]

I think this board is total solution with a specific mcu controlling the display. So, yes, this is the wrong type.

[MBB]

Thanks for the fast response.

Does anyone have a link to an e-paper display that will work with GCB?

[Anobium]

These are the part I have used - check with them if this part number includes the HAT and the e-Paper display

Small Display
212x104, 2.13inch flexible E-Ink display HAT for Raspberry Pi
SKU: 15084
Part Number: 2.13inch e-Paper HAT (D)
https://www.waveshare.com/2.13inch-e-paper-hat-d.htm

[MBB]

Thanks!

[MBB]

I now have the display Anobium mentioned above.

I'm using Great Cow BASIC (1.00.00 2023-05-31 (Windows 64 bit) : Build 1249) with an 18F4550.

I copied the below program from GCB Help:

;Chip Settings
#chip 18F4550,48
#config PLLDIV=1, CPUDIV=OSC1_PLL2, OSC=HSPLL_HS, LVP=OFF, MCLRE=ON

 #include <glcd.h>

 #define HWSPIMode MasterFast

 #define GLCD_TYPE GLCD_TYPE_EPD_EPD2in13D
 #define GLCD_EXTENDEDFONTSET1
 #define GLCD_TYPE_EPD2in13D_LOWMEMORY4_GLCD_MODE
 #define GLCD_OLED_FONT
 #define GLCD_PROTECTOVERRUN

'Pin mappings for SPI - this GLCD driver supports Hardware SPI and Software SPI
#define GLCD_SCK portB.1
#define GLCD_CS portB.2
#define GLCD_DC portB.3
#define GLCD_RESET portB.4 .
#define GLCD_Busy portD.2
#define GLCD_DO portC.7

    #define EPD_HardwareSPI

'Pulling BUSY line high allows SCK, CS, DC & MOSI signals to work
' BUT display still does NOT work.

wait 100 ms

'Main program

GLCDForeground=TFT_BLACK
GLCDBackground=TFT_WHITE

    Do_Again:

        GLCD_Open_PageTransaction
            GLCDPrintStringLN ("Great Cow BASIC")
            GLCDPrintStringLN ("")
            GLCDPrintStringLN ("Test of the e-Paper")
            GLCDPrintStringLN ("")
            GLCDPrintStringLN ("Aug. 2023")
        GLCD_Close_PageTransaction
        GLCDDisplay Off

            wait 2 s
            GLCDDisplay On
            GLCDCLS
            GLCDDisplay off

Goto Do_Again


I can see the SPI signals on my O'Scope BUT the display remains blank.

Any ideas what I'm doing wrong?

[Anobium]

No idea. If the program is a demo program. Then, that is a good start.

Try using software SPI. comment out #define EPD_HardwareSPI

[Chris Roper]

Looking at your code are you not missing a GLCDDisplay On
After the Do_Again Label?

[Anobium]

Also, slow that clock speed down for the purpose of testing.

Also, when using the hardwareSPI, slow the SPI frequency. Add #define HWSPIMode MASTERSLOW ( this is shown in the Help :-) )

[MBB]

Thanks!

I tried the above suggestions but the display still remains blank.

Any other suggestions?

[Anobium]

This is probably a product version issue.

Let us assume that the library works. I know it does.

Looking at GitHub there are four different displays. And, I have scanned the different versions of the GitHub code and the 2019 GCBASIC library is version 1 of the hardware. The initialisation is very different across the four different displays.

So, figure out which one you have. And, then, using the CPP file ( appropiate to your display ) change Init_EPD2in13D() and LoadLUTS_EPD2in13D() to suit. The LUTS data ( not need for version 4 of the display) is simply tables in GCBASIC.

Makes sense?

[MBB]

Thanks!

I'll try this.