The getchar function reads a single character from the
input stream using the _getkey function. The character read is
then passed to the putchar function to be echoed.
Note
This function is implementation-specific and is based on the
operation of the _getkey and putchar functions. These
functions, as provided in the standard library, read and write
characters using the microcontroller's serial port. Custom
functions may use other I/O devices.
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