Figured out how to get SDK v3.1 working!
Install Espressif Toolchain: https://cutmywire.wordpress.com/2017/05/08/esp8266-windows-10-sdk-installation/comment-page-1/#comment-943
Overcome hurdles of Toolchain Installation: esp8266/esp8266-wiki#74
Makefile source: https://github.com/esp8266/source-code-examples/blob/master/blinky/Makefile (adapted this one to SDK v3.0)
Latest esp_init_data_default.bin file: https://github.com/espressif/ESP8266_NONOS_SDK/tree/master/bin
Simple example from Espressif on how to write Code for SDK v3.0: https://github.com/espressif/ESP8266_NONOS_SDK/tree/master/examples/simple_pair
Fix partitioning error on startup for D1 mini (at least for me): https://blog.csdn.net/yannanxiu/article/details/83550183
How COM-Ports from Windows are mapped to linux subsystem: https://blogs.msdn.microsoft.com/wsl/2017/04/14/serial-support-on-the-windows-subsystem-for-linux/
How to fix permission error on dev/ttyS: microsoft/WSL#617
Projects
--bin\ (from here)
--ProjectDirectory
--user (contains your source-code)
--Makefile (from here)
--user_main.c
--user_config.h
--Makefile (from here)
--ld (exact same folder and content as here)
--lib (exact same folder and content as here)
--tools (exact same folder and content as here)
--gen_misc.sh (if you want)
--Makefile (from here)
You either call ./gen_misc.sh or Makefile from Projects-Folder.
I compile my project like this:
$ make COMPILE=gcc BOOT=2 APP=0 SPI_SPEED=40 SPI_MODE=DIO SPI_SIZE_MAP=4
If, for whatever reason, the compiler doesn't find the include path to the SDK where all the header files are, do this:
- Add the path to your include directory (e.g.
/opt/esp/sdk/include) to the INCLUDE-statement at the very bottom of the outer-most Makefile.
You should also make sure that the path to the compiler is in your $PATH-Variable, in my case for example:
$ PATH=$PATH:/opt/esp/crosstool-NG/builds/xtensa-lx106-elf/bin
While you're at it, you can also add the SDK folder:
$ PATH=$PATH:/opt/esp/sdk/include
Unfortunately, the linux subsystem doesn't remember changes made to the $PATH-Variable. So after every reboot I have to type in again the two commands mentioned above.
I also added two more commands in the upper-most Makefile (which is not part of this repository) to make flashing and erasing easier:
erase:
esptool.py --port $(PORT) erase_flash
flash:
esptool.py -b 921600 --port $(PORT) write_flash 0x0 bin/eagle.flash.bin 0x10000 bin/eagle.irom0text.bin 0x3FC000 bin/esp_init_data_default_v08.bin
Flashing the ESP8266 now works like this make flash PORT=/dev/ttyS5
If somehow esptool doesn't work or throws weird errors (like rom doesn't support changing baud rate. keeping initial baud rate 115200), remove the package from your linux distribution and instead clone the latest version from github. As the last step, add the directory to your $PATH-Variable: PATH=$PATH:/opt/esp/esptool/.
The address 0x3FC000 is for the board I use at the moment (D1 mini), it may not work with yours. The esp_init_data_default_v08.bin is from here.
Check out the Getting Started Guide on page 15 to get more information about the specific address for the esp_init_data_default.bin file.
BMP280 Documentation: https://cdn-shop.adafruit.com/datasheets/BST-BMP280-DS001-11.pdf
ESP8266 reads ID from BMP280 via Soft-I2C (analyzed with Saleae Logic Analyzer):
Library for SSD1306 OLED Display communication: https://www.mikrocontroller.net/topic/415651
Basic Wifi Structure (Sample Codes -> ESP8266 as TCP Client): https://www.espressif.com/en/products/hardware/esp8266ex/resources
First breadboard construction: 