[akiselev]

I recommend the BeagleBone as a better starting point than STM32s. It combines an ARM processor core capable of running linux with microcontrollers so you can run Linux on the CPU and realtime firmware on the MCU cores.

If you want to get into FPGA development, I would recommend a ZYNQ based board [1] which is similar to the BeagleBone except instead of microcontrollers, ZYNQ chips combine an ARM CPU with an FPGA. I'd recommend something like the Analog Discovery 2 [2] for data capture since 90% of FPGA development is test benches and validation.

[1] https://store.digilentinc.com/cora-z7-zynq-7000-single-core-...

[2] https://store.digilentinc.com/analog-discovery-2-100msps-usb...