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SWD pin #21
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SWD is a protocol like JTAG. The pins can be used to connect a debug probe like "STLinkV2" during development of the firmware for the programmer. https://en.wikipedia.org/wiki/JTAG#Similar_interface_standards Schematics for easyeda ( https://easyeda.com/ ) are in this repository. Eagle is not available |
What's the pinout on the SWD header? If everything works, connecting the ground pin and using the guess-and-check method should be a viable way to figure out the pin order, but if something's wrong, not knowing the pins would make debugging the circuit a PITA. |
Hmmm... you are right, 2 SWD pins are not labeld in schematics. But, SWD has only 4 pins (VCC,GND,SWDIO,SWDCLK). So you only would need to try 2 possibilities. Chances that you get it right first time is 50% :-) For your reference: Pin1 (squared): 3.3V |
Hello,
thanks for sharing this really cool project
I have do assembly for few of those and trying to understand
What is usage of SWD ?
Do you have any schematic/PCB design available for Eagle PCB
Rgds
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