Arduino Pro Mini ATmega 328P: garbage output on serial console Arduino Pro Mini ATmega 328P 3.3V 8MHz, connected to USB port via USB to Serial breakout board built around the FT232RL FTDI chip. JTAGenum project code uploaded to the Arduino. I opened terminal and tried to run test command (without connecting wires between target and Arduino), but terminal output show garbage values. The baud rate of the serial console has been set 115200, as specified in JTAGenum code. Not sure whether this issue can be related to CPU_PRESCALE defintions in code.
Garbage values on output is mostly due to the baudrate.

Try changing the baudrate on the output terminal to the baudrate in the code.
Try checking the output by changing different baudrates on the terminal.

This must work for you :)