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README.md

multipass - a multi-architecture library operating system

multipass is a C++ Library Operating System for a few embedded architectures. As such, it does not provide multi-threading support or similar conveniences. Its objective is similar to the Arduino environment: provide a simple framework for embedded application/driver development and evaluation, and get out of the way as much as possible. It favors simplicity over performance and abstraction. Re-using components outside of multipass should be fairly easy.

Application, architecture, and drivers are configured using make config (X11, kconfig-qconf) or make nconfig (Terminal, kconfig-nconf). Each application must implement int main(void) and do everything itself from that point on. When the loop feature is enabled, void loop(void) must be implemented also.

Getting Started

  • make config
  • make
  • make program
  • make monitor

Two helper scripts are provided:

  • ./mp is a shortcut for make info and make program (build and flash)
  • ./mpm is a shortcut for make info, make program, and make monitor (build, flash, and monitor output)

Flags are passed to each make invocation.

For common applications, the arch and app compile switches can be used, e.g. ./mpm arch=posix app=ledblink

You should see some data about the compilation process, "Hello, world!", and some numbers. As POSIX is not a standalone architecture (it builds an ELF binary that is executed directly on Linux), you do not need a microcontroller to run it. Terminate execution using Ctrl+C.

Supported Architectures

See make config for an up-to-date list.

ATMega168P, ATMega328P (Arduino Nano)

Peripheral communication:

  • I²C (master only, interrupt-driven)
  • SPI (master only, polling)
  • UART (output polling, input interrupt-driven)
  • NeoPixel/WS2812B (Adafruit driver)

Hardware features:

  • ADC (partially)

MSP430FR5969, MSP430FR5994 (MSP430FR59xx Launchpad)

Peripheral communication:

  • I²C on eUSCI_B0 (master only, interrupt-driven)
  • SPI on eUSCI_B0 (master only, polling)
  • UART on eUSCI_A1 (output polling, input interrupt-driven)

Hardware features:

  • 20bit mode (use up to 256kB FRAM for code and data)
  • ADC (partially)

POSIX

Runs the selected application as POSIX thread, e.g. under Linux on a Raspberry Pi.

Peripheral communication:

  • I²C (master only, via /dev/i2c)
  • stdin/stdout

Included Drivers

See make config for an up-to-date list.

  • AM2320 I²C Temperature and Humidity Sensor
  • BME280 I²C Temperature, Humidity, and Pressure Sensor (Bosch SensorTec driver)
  • BME680 I²C Temperature, Humidity, Pressure, and Air Quality Sensor (Bosch SensorTec driver)
  • CCS811 I²C Air Quality Sensor
  • DS2482 I²C 1-Wire Bus Controller
  • HDC1080 I²C Temperature and Humidity Sensor
  • LM75 I²C Temperature Sensor
  • LS013B4DN04 96×96 transflective LCD (430BOOST-SHARP96)
  • MAX44006 I²C RGB and IR Light Sensor
  • MAX44009 I²C Light Sensor
  • MPU9250 I²C Accelerometer, Gyroscope, and Magnetometer Sensor
  • Pervasive Aurora Mb V230/V231 4.2" iTC E-Paper Display via EPD Extension Board Gen 2
  • SCD40/SCD41 I²C CO₂ Sensor
  • SSD1306 I²C OLED Display Controller
  • VEML6075 I²C UVA/UVB Light Sensor