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docs: Note pins used for stm32flash in Bootloaders.md 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2022-05-04 13:54:42 -04:00
parent 722ad4a1d2
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docs/Bootloaders.md
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@ -254,10 +254,11 @@ bossac -U -p /dev/ttyACM0 --offset=0x4000 -w out/klipper.bin -v -b -R
## STM32F103 micro-controllers (Blue Pill devices)
The STM32F103 devices have a ROM that can flash a bootloader or
application via 3.3V serial. To access this ROM, one should connect
the "boot 0" pin to high and "boot 1" pin to low, and then reset the
device. The "stm32flash" package can then be used to flash the device
using something like:
application via 3.3V serial. Typically one would wire the PA10 (MCU
Rx) and PA9 (MCU Tx) pins to a 3.3V UART adapter. To access the ROM,
one should connect the "boot 0" pin to high and "boot 1" pin to low,
and then reset the device. The "stm32flash" package can then be used
to flash the device using something like:
```
stm32flash -w out/klipper.bin -v -g 0 /dev/ttyAMA0
```