Serial communication can be understood as opening files, writing files, reading files, and closing files.
Using the system function open, write, read, close function
char path[20] = "dev/ser1";
if ( ( fd = open ( path, O_RDWR,S_IRUSR | S_IWUSR) ) != -1 )
Serial communication must first set the baud rate, parity, number of data bits, and stop bits.
Serial communication data is usually written in the form of a common body
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