How to see the px4iofirmware/mixer.cpp debug message?

Connect to pixhawk4 with FTDI cable,
I want to debug mixer.cpp, and want to see debug message in the code
isr_debug(1, "AP RX timeout");
–try px4io debug 5,nothing happened
–write some “printf”to mixer.cpp, cant see any message from nsh
–move FTDI cable to IO debug port, there will be black squares, or some gibberish

when the cable connect to fmu debug port, it works well

The same cable connect to IO debug port, it will be

does anyone knows how to see IO debug message or what’s wrong with my cable?? Many thanks

Try changing the baudrate to 115200.

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It works