Posted on June 20, 2016 at 08:12> Hi, I'm totally frustrated with Microchip Harmony, so looking for suggestions on getting quickly up to speed using ST ARM.
If you are looking for an alternative RTOS, there are literally dozens available for Cortex M (including ST's STM32). Like FreeRTOS for instance (there is a PIC32 port, too).
For the rest, I think you need to look yourself. There are plenty of evaluation boards that more or less match your hardware description.
As well, there are plenty of toolchains and libraries available which you might want to evaluate. Not like the situation with Microchip (''All from one hand !'', which often translates to ''All in one hand'').
Not sure what the target application is. But be aware that graphics are not a great strength of Cortex M MCUs. If you deal with large images, complex GUIs or video, a Cortex A (with GPU and OS support) might serve you better.
