Comments (3)
freepdk
commented on August 9, 2024
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
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benlovage
commented on August 9, 2024
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.
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freepdk
commented on August 9, 2024
Hmmm... you are right, 2 SWD pins are not labeld in schematics.
But, SWD has only 4 pins (VCC,GND,SWDIO,SWDCLK).
Pin 1 (square) is shown in schematics as 3.3V and Pin 4 is GND.
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
Pin2: SWDIO
Pin3: SWDCLK
Pin4: GND
from easy-pdk-programmer-hardware.
Related Issues (20)
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