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Q

How can I printf debug messages to a host PC with the evaluation board NXHX 90-JTAG?

A

A simple option is to use the interface UART_SHARED. This can be routed via an onboard FTDI Chip over USB to the host PC.
The same USB cable as for the JTAG connection is used. I.e. there are 2 channels over the same cable: 1) JTAG, 2) UART.

If the UART_SHARED shall be used for debug input/output (terminal) of the netX 90 APP side, it cannot be used as a maintenance interface of the COM side (Marshaller)

Please refer to the FAQ page Using 3 UART interfaces for further details about the configuration.