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stlink: Added documentation about the new SWIM_AS_UART build option

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dragonmux 2022-06-28 19:53:56 -04:00 committed by Piotr Esden-Tempski
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commit 9b8d2fb822
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src/platforms/stlink/README.md
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# Blackmagic for ST-Link Adapters
ST-Link v3, ST-Link v2-1 and v2 with original, recent ST firmware can can use the hosted branch, running the GDB server on PC.
With recent ST firmware, the ST-Link v2, ST-Link v2-1 and v3 can be used with
Black Magic Debug App rather than having to flash this firmware to the adaptor.
Running the BMP firmware on ST-Link v2 and ST-Link v2-1 provides:
@ -11,6 +12,12 @@ Running the BMP firmware on ST-Link v2 and ST-Link v2-1 provides:
For all commands below, unplug all other BMP/ST-Link beside the target(*1)
If your adaptor offers SWIM pins on the connector (many of clones of the official adaptors do this)
then they often don't provide a UART interface. In this case, build the firmware with
`SWIM_AS_UART=1` to repurpose the pins as the UART interface provided to the host over USB.
Note: on some clones, SWIM is strongly pulled up by a 680 Ohm resistor.
## Upload BMP Firmware
* Keep the original ST Bootloader.