Hi, as your hardware / software is open source I wonder if there’s a link to the actual firmware on the Triple Color E-Ink Display 2.13"?
Found <LINK_TEXT text=“https://github.com/Seeed-Studio/Grove_T … E-lnk_2.13”>https://github.com/Seeed-Studio/Grove_Triple_Color_E-lnk_2.13</LINK_TEXT> which does not seem to contain the “SPI to UART” firmware on the ST Electronics ARM M0 (stm32f031f6p6tr) on the Grove module.
Kind regards,
Thomas
hi ,
Are you looking for the source code for the programme? check this: <LINK_TEXT text=“https://github.com/Seeed-Studio/Grove_T … de_213.ino”>https://github.com/Seeed-Studio/Grove_Triple_Color_E-lnk_2.13/blob/master/examples/Eink_factory_code_213/Eink_factory_code_213.ino</LINK_TEXT>
Hi,
I’m also looking for the source code to this file: epd2in13b-demo.ino.bin
And how to access the STM32? Is it possible through the UART interface like with the heart rate sensor?
I have basically the same question. There is a “firmware download interface” highlighted in one of the photos. What I’m looking for is the source code for this firmware. Also, the github repo referenced in the question says " 1. If you need to change the startup code, check out the library’s code for STM32." but it doesn’t say where that is.
If all that’s going on here is UART-to-SPI conversion, then presumably it’s pretty straightforward; however I would like to understand how the command/data to the display is being controlled. It looks like the characters ‘a’ (transmitted) and ‘b’ or ‘c’ (received) have some control function.
+1 on the same questions.
I gave up and finally de-soldered the STM32 and hard wired to the SPI interface of the display. Works like a charm now with all libraries 
Info here on how to use it with SPI: