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As of Jan 2019 we still like Cortex-M a lot stm32, here are the reasons: Performance, Availability, Toolchain, Hardware API.

  1. Performance - stm32 gives us 160MHz and close to 200Kb of RAM with floating point unit.

  2. Availability stm32 is cheap and readily available in low quantity both just chips and convenient dev boards

  3. Toolchain Free GNU Arm Embedded Toolchain allows us to compile and debug software

  4. Hardware API ChibiOS Hardware Abstraction Layer allows us to not spend too much time debugging low level peripheral registers

One of the things we do not like about smt32 Cortex-M is the fact that this family is not automotive and not based on 5 volts. In an ideal chip we would like to see 5v ADC and maybe more hardware timers.

We've looked into a few other chips but so far have not found a better overall platform.

Relevant forum threads:

S32K148 https://rusefi.com/forum/viewtopic.php?f=13&t=816

SPC563Mx, MPC563x - this one has some ChibiOS support - https://rusefi.com/forum/viewtopic.php?f=13&t=429

TMS570 - https://rusefi.com/forum/viewtopic.php?f=13&t=407 & https://github.com/rusefi/rusefi/issues/89

(in Russian) https://rusefi.com/forum/viewtopic.php?f=8&t=269