Message-ID: <CAN8WEg2W8-mqoscnF=Qe1g5auQVgDTHoJnmmP=WpiyFO+yXTiw@mail.gmail.com>
Date: 2015-04-02T02:03:29Z
From: Adam Rountrey
Subject: Windows serial connection
Using Windows 8.1
I have an Arduino connected and I am trying to read from and write to a
serial connection using R. The problem involves the reading. I am able to
establish the connection using the following:
> system("mode COM4 baud=9600 parity=n data=8", show.output.on.console=T)
> a = file("COM4", open="r+",encoding="UTF8", blocking=F)
I am able to write to the connection using:
> writeOne = function(x){
> cat(paste(x, "\n", sep=""), file = a)
> }
> writeOne("test")
I am able to read from the connection using:
b = readLines(a,n=1)
However, if I read the last line in the COM4 buffer, and the Arduino later
writes more to the buffer, I am unable to read it. I only get
"character(0)". The Arduino seems to be behaving okay, as I can read an
write using the Arduino Serial Monitor. If after reaching this point, I
close the connection and open it again, I am able to read from COM4 again
(until I read a final value again). Any ideas as to what might be going
one here?
Many thanks for any ideas.
[[alternative HTML version deleted]]