FreeRTOS-Kernel/FreeRTOS/Demo/CORTEX_M3_MPS2_QEMU_GCC

Emulating MPS2 Cortex M3 AN385 on QEMU

Requirements

1. GNU Arm Embedded Toolchain download here
2. qemu-arm-system download here
3. Make (tested on version 3.82)
4. Linux OS (tested on Ubuntu 18.04)

How to download

Navigate to a parent directory of your choice and run the following command

$ git clone https://github.com/FreeRTOS/FreeRTOS.git --recurse-submodules --depth 1

The previous command should create a directory named FreeRTOS

Blinky Demo

How to build blinky demo

Navigate with the command line to FreeRTOS/Demo/CORTEX_M3_MPS2_QEMU_GCC For a release build run:

$ export PATH=/path/to/arm/toolchain:$PATH
$ make

For a versions with debugging symbols and no optimizations -O0, run:

$ make DEBUG=1

How to run the blinky demo

run:

$ sudo qemu-system-arm -machine mps2-an385 -monitor null -semihosting \
        --semihosting-config enable=on,target=native \
        -kernel ./build/RTOSDemo.axf \
        -serial stdio -nographic

Blinky Demo Expectations

after running the blinky demo you shoud see on the screen the word blinking printed continuously

How to start debugging

1. gdb

Append the -s and -S switches to the previous command (qemu-system-arm)
-s: allow gdb to be attached to the process remotely at port 1234
-S: start the program in the paused state

run: (make sure you build the debug version)

$ arm-none-eabi-gdb -q ./build/RTOSDemo.axf

(gdb) target remote :1234
(gdb) break main
(gdb) c