Description
This function causes characters to be read from the specified port until a specified terminating
character is received. The characters are read from the internal input buffer and placed in the
specified input data area.
The function returns both the number of characters retrieved and the number of unprocessed
characters still in the input buffer. If zero characters of input are requested, only the number of
unprocessed characters in the input buffer is returned.
If the terminating character is not in the input buffer, the status of the operation is not complete until
either the terminating character has been received or the time-out interval expires. In either of those
conditions, the port status indicates the reason for completion of the read operation.
If the time-out interval is set to zero, the COMMREQ remains pending until it has received the
requested string, terminated by the specified end character.
If this COMMREQ fails for any reason, no data is returned to the input data area. Any data that has
not been read from the internal input buffer remains, and it can be retrieved with a subsequent read
request.
If the input data memory type parameter is specified to be a word memory type, and if an odd
number of bytes is actually received, then the high byte of the last word to be written with the
received data is left unchanged.
As data is received from the serial port it is placed in the internal input buffer. If the buffer becomes
full, then any additional data received from the serial port is discarded and the Overflow Error bit in
the Port Status word (See Read Port Status Function) is se
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