Eduardo José Tagle 0c428a66d9 Proper AVR preemptive interrupt handling (#10496)
Also simplify logic on all ARM-based interrupts. Now, it is REQUIRED to properly configure interrupt priority. USART should have highest priority, followed by Stepper, and then all others.
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This HAL is for the STM32F407 MCU used with STM32Generic Arduino core by danieleff.

Arduino core is located at:

https://github.com/danieleff/STM32GENERIC

Unzip it into [Arduino]/hardware folder

This HAL is in development.

This HAL is a modified version of Chris Barr's Picoprint STM32F4 HAL.