| gcc and OpenOCD work well. There are plenty of open source projects for STM32 There is https://www.openstm32.org Also there are plenty of Open Source RTOS projects that come with a HAL, so you can write code that is vendor independent. Zephyr is probably the largest full-featured RTOS, it's backed by the Linux Foundation and several hardware vendors (NXP, Nordic, Intel, Ti and SiFive), but the community provides support for other vendor's chips too. RIOT-OS is more popular in the academic sector, targeting sensor networks. NuttX tries to bring a POSIX environment to your MCU and of course STM32 is supported there too. there is of course ARM Mbed, but that feels more like a framework than an integrated OS. Heck you can even run Linux on the larger STM32s (M4, M7) if you attach some external RAM - kernel support was provided by ST themselves. |