comtest

NanoPi Fire 2A Serial port communication in C.

and you can use this link:
https://github.com/atrotech/QtE-Demo/blob/main/SerialPort.cpp

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How to build

# git clone https://github.com/atrotech/comtest.git
# cd comtest
# gcc -o comtest comtest.c

Usage

./comtest -d /dev/ttyAMA3 -s 38400

Parameters

# ./comtest --help
comtest - interactive program of comm port
press [ESC] 3 times to quit

Usage: comtest [-d device] [-t tty] [-s speed] [-7] [-c] [-x] [-o] [-h]
         -7 7 bit
         -x hex mode
         -o output to stdout too
         -c stdout output use color
         -h print this help

friendlyarm NanoPi Fire2A Serial port wiki

https://wiki.friendlyarm.com/wiki/index.php/Serial_port