eDashbox

E-bike dashboard and datalogger, opensource. Firmware for STM32-Nucleo32L4 board.

This is STM32 learning project in early stage, use it at your own risk.

Build

Note: Development is in 'master' branch, don't be surprised for a lot of compilation errors.

Prerequisities

• Linux
• tup build system
• Nim language compiler
• GIMP
• ImageMagick
• SEGGER JLink debugger and software
• STM32 CubeMX (optional)
• Microsoft VS code (optional)

Process

• First time build after 'git clone' or after CubeMX code generation run:

$ Tools/configure.sh
$ tup

• Regular builds - just run:

$ tup

Debug

• JLink debugger setup for VSCode https://wiki.segger.com/J-Link_Visual_Studio_Code

IDE

VS code - it is fast and stable, especially with debugging. Fix not found includes in VS code: https://stackoverflow.com/questions/37522462/visual-studio-code-includepath

Hardware

STM32 Nucleo-32 board (STM32L432KC)

DS18B20 temperature sensor

• Use 4.7 kOhm resistor from Vdd to Data pin, accordig to specs
• Tested with 3.3V Vdd

SH1122 2.08" 256x64 16 colors OLED Display

https://www.aliexpress.com/item/4000866935030.html

Status

List of working features, mostly:

• Main screen speedo/tacho, rpm bar graph, clock, battery pie chart, odometer.
• FatFs with MicroSD, currently not used
• 2 temperature sensors
• Hall sensor
• ADC sampling for Volt/Ampere meters
• 2 buttons

TODO

• Config save to EEPROM
• Change IDE to Vim, configure debugging
• Test FatFs for MicroSD formatted with mkfs.vfat
• GPS
• current sensor (Allegro ACS758 200A bidirectional)

Credits

• Tiny printf() for embedded systems: https://github.com/mpaland/printf

• SH1122 OLED Display HAL driver: https://github.com/mikhail-tsaryov/SH1122-STM32-HAL-Driver

• DS18B20 temperature sensor onewire HAL driver: https://github.com/lamik/DS18B20_STM32_HAL

• SPI MicroSD FatFs code: https://github.com/eziya/STM32_SPI_SDCARD

• Tup build system: http://gittup.org/tup/manual.html