Black Magic Probe
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Usually when flashing and debugging software on STM32 one would use a ST-Link device (either original or a cheap Chinese clone). For some completely incomprehensible reason, ST are not making the source code for the ST-Link readily available. Not only do they not provide source code, but it would appear they are actively trying to prevent clones from working.
Fortunately there are open source solutions available, the most prominent of these being the Black Magic Probe from 1BitSquared.
Platforms
The Black Magic Probe firmware can be build for many different platforms with different pinout. The following sections list the pinout.
Blue Pill
Build
$ make PLATFORM=bluepill
Pinout
Black Pill
Build
$ make PROBE_HOST=f4discovery BLACKPILL=1 ENABLE_RTT=1
Pinout
| Function | Pin |
|---|---|
| TDI | PA1 |
| TMS/SWDIO | PA13 |
| TCK/SWCLK | PA14 |
| TDO/SWO | PB3 |
| TRST | PB5 |
| SRST | PB7 |
| TX | PB6 |
| RX | PB7 |