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It's possible for the code to stay in the timer irq for up to 100ms,
so serial irqs should have a higher irq priority to prevent them from
being starved. (The timer code disables irqs during event dispatch,
so serial irqs would only be permitted between events anyway.)
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Extract out common code from avr/serial.c, sam3x8e/serial.c, and
stm32f1/serial.c into a new generic/serial_irq.c file.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Add a fully functional STM32F1 port, currently mostly targeting STM32F103
microcontrollers. This requires an 8 MHz XTAL. The maximum possible step rate
is around 282K steps per second.
This uses stm32flash to burn the firmware. The bootloader needs to be started
by setting BOOT0 to 1 and resetting the MCU. There is no automatic bootloader,
unlike on Arduino.
Signed-off-by: Grigori Goronzy <greg@kinoho.net>
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