This project contains the software bits for a e-ink display David has created, and I've modified
That is the plan:
Build a "Kitchen Calendar" by using a Waveshare eInk Display with STM32 processor. http://www.waveshare.com/product/4.3inch-e-Paper.htm
It is connected to a ESP8266 via UART (serial). The ESP8266 will use its Wifi to upload latest calendar entries from my Google-Calendar (e.g. twice a day).
Once loaded it will wake up the STM32 to update the eInk display. By this method power consumption is limited only for some seconds activity over the day - and we a always a good view on our daily activities.
Processing on the ESP8266 is limited as possible and to build most logic on the STM32.
This is possible based on the great work of this two people: https://davidgf.net/page/41/e-ink-wifi-display https://github.com/X-Ryl669/wifi_display
They have extracted the original firmware and give the possibility to program the STM32 on the eInk display.
I have adjusted the cmake-file, the development is very easy by using CLION, including remote-debugging.
https://github.com/happychriss/ePaper_Calendar_Wifi_esp The ESP should have the function to
- connect via wifi to Google-Account
- download the calendar information
- wake up the STM32
- push the calendar information to STM32
Development is done also in CLION under Arduino using platformio.io for maintaining the dependencies.
- media: Some pictures used by the screen (taken from davids project)
- stm32_application: STM32F firmware that actually drives the screen (was builtin in the board!)
- stm32f10x: ST includes and libs used to build the stm32 firmware
You will need to build the FW images with their corresponding toolchaings and flash them. If you're using MacOSX or Linux, you'll be interested in:
- https://github.com/texane/stlink for the method to upload the freshly built STM32 firmware to your board (you need a ST-LINKv2 programmer, easy to find on Ebay for 5$)
- https://launchpad.net/gcc-arm-embedded for an already compiled cross compiler (used to build the STM32 firmware)
- The Expressif SDK (If you need a prebuild disk image for MacOSX, I'll upload mine)
Using UART to connect:
- Connected RX/TX on the STM32 big white and green connector to the ESP8266's pin GPIO13 and GPIO14 (I'm using the trick to swap the UART0TX output to MTDO)
- Connected GND from the ESP8266 to the programming pin on the STM32 (see David's website for a description of this programming pins, basically it's the third)
- Connected 3.3V from the ESP8266 to the programming pin on the STM32 (it's the first pin)
- Connected RST on the STM32 big white connector (RST pin 1) on the left to the ESP8266's pin GPIO12.
- see https://44-2.de/screenshot-from-2019-06-15-20-51-41/
This thing uses the Good Diplay device codenamed GDE043A2, you may find stuff googling the web. The main issue though is that there is little support and the datasheet doesn't explain a thing, check gde043a2.c to see how the driver actually works. It seems GDE060BA works all much the same (they seem to be the same device with slightly different pinouts and screen sizes, but same resolution and probably same driver).