Aaron Christophel | Quick tip finding an unknown Debug interface pinout (SWD) shown on the MiBand with @atc1441 | Uploaded March 2022 | Updated October 2024, 5 hours ago.
Quick video about how i did reversed / found the Debug interface pinout on the Xiaomi MiBand.

This can be used very universal with many different interfaces, hardware or debug tools and the MiBand is just used as an example.

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Python script from the video:

import subprocess
import winsound

def check_connection():
output = subprocess.check_output("JLink.exe -device DA14697 -NoGui 1 -CommandFile jlink_auto_file.jlink", shell=True).decode()
if "Cannot connect to target" in output:
print("Not found!")
winsound.Beep(500, 100)
else:
print("Found!")
winsound.Beep(4000, 100)
winsound.Beep(1000, 100)
winsound.Beep(4000, 100)
winsound.Beep(1000, 100)
winsound.Beep(4000, 100)
winsound.Beep(1000, 100)
winsound.Beep(4000, 100)
winsound.Beep(1000, 100)

while 1==1:
check_connection()






------------------------
jlink scriptfile:
jlink_auto_file.jlink:
decvice DA14697
if SWD
speed 40000
connect


exit