OSEK_RISC-V_SiFive_FE310_SoC

This repository implements an OSEK-like, bare-metal operating system for RISC-V (SiFive RISC-V FE310 SoC). The goals are to achieve near-compatibility with OSEK (ECC1/BCC1) and to provide an intuitive, easy-to-understand sample application that can be extended for your own projects.

Features include:

• OSEK-like OS implementation with support of most common features.
• The sample application runs on the SparkFun Red Thing RISC-V FE310 Board.
• Tasks and events interact to produce a blinky LED show featuring the blue LED toggling at 1/2 Hz (blue).
• Use a simple self-written bare-metal startup.
• Power, clock and port initialization.
• Implementation in C99 with absolute minimal use of assembly.

A clear and easy-to-understand build system based on free GNUmake/GCC.

This repository provides keen insight on writing your own bare metal operating system from scratch on a modern microcontroller using entirely free tools and open standards.

Details on the Application

Following low-level chip initialization, the program jumps to the main() subroutine in main.c. Here there are two functional lines. The first line initializes the LEDs. The second line subsequently starts the operatng system via call to OS_StartOS().

An idle task and one single extended task animate the user LED, providing a simple blinky LED show featuring the blue LED toggling at 1/2 Hz (blue). These straightforward sample tasks can be found in tasks.c.

Building the Application

Build with GNUmake on *nix

Build on *nix* is easy using an installed gcc-arm-none-eabi

cd OSEK_RISC-V_SiFive_FE310_SoC
./Rebuild.sh

The build results including ELF-file, HEX-mask, MAP-file can be found in the Output directory following the GNUmake build.

References

Further information on open standard OSEK can be found in ISO 17356 and in the link below:

• https://en.wikipedia.org/wiki/OSEK