TP FreeRTOS on STM32F1VLDiscovery board or STM32F103 (update the LD script accordingly)

Assumes the Long Term Supported version of FreeRTOS as available at https://github.com/FreeRTOS/FreeRTOS-LTS (remember to git clone --recursive), or the version found at https://www.freertos.org/a00104.html, is located at the same level than this set of examples: tune the Makefiles accordingly for the header files and libraries to reach this directory. Former versions of FreeRTOSv9.0.0 or FreeRTOSv10.0.0 can be used as well: in that case tune the parameters of Makefile.v9 accordingly).

Compilation flags:

• -DSTM32F1 or -DSTM32F4 to select whether the board is fitted with and STM32F100/STM32F103 microcontroller or with a STM32F407 (STM32F4Discovery)
• in case -DSTM32F1 is selected, either select -DSTM32F10X_LD_VL for the STM32F100 ValueLine or the -DSTM32F10X_MD MediumDevice
• in case -DSTM32F10X_MD is selected, then add -Dsenseor for running on the hardware board (SENSeOR reader fitted with the XE1203F radiomodem) without resetting the FTDI (keeping the GPIO connected to the FT232 reset pin as input). For running on Qemu, do not enable -Dsenseor.
• the Texas Instruments Stellaris Cortex M4F core is supported and allows for simulating the execution on the official qemu-system-arm emulator release: in that case, the linker script is stellaris.ld found in the ld directory.

Using libopencm3 to provide system calls required by FreeRTOS running on the STM32 microcontroller (instead of ST Microelectronics' libstm32) is described at http://www.jiggerjuice.info/electronics/projects/arm/freertos-stm32f103-port.html and was used in this set of demonstrations.

Tested with Andre Beckus' port of qemu to the stm32 (https://github.com/beckus/qemu_stm32): compile examples for the STM32F103 (MD) device. Also tested with Renode (https://github.com/renode) emulating the STM32F103:

The Renode model has been updated to display GPIO/LED output state. Here also the very verbose gpioPortC status is displayed, which can be removed by commenting (prefix with :) the sysbus LogPeripheralAccess sysbus.gpioPortC line in 1basic/stm32f103.resc

This set of laboratory sessions was developed independently but happens to closely match the topics of Beginning STM32: Developing with FreeRTOS, libopencm3 and GCC which might provide additional references to my own supporting material found at http://jmfriedt.free.fr under the Master1 section/embedded electronics/2nd semester. The github might provide complementary resources.

• Q. Macé, J.-M Friedt, FreeRTOS : application à la réalisation d'un analyseur de réseau numérique sur STM32, GNU/Linux Magazine France 207 (Sept. 2017)
• J.-M Friedt, Intercorrélation par transformée de Fourier rapide sur microcontroleur sous FreeRTOS, et les pointeurs de pointeurs, Hackable 43 pp.4-- (Jul.-Aug. 2022)
• J.-M Friedt, FreeRTOS dans 2,5 KB de RAM sur Atmega32U4, Hackable 48 (May/June 2023)