Hi Monks, I am trying to setup a serial communication between arduino uno and pc using Perl. I am using Win32::SerialPort module for the same

The problem is I am not able to read or write to the arduino In config.pl file I am saving the settings to conf.cfg file and in serial.pl I am trying to write to arduino

Config.pl

use strict;
use Win32::SerialPort;

my $ob = Win32::SerialPort->new ('COM22') || die;


$ob->baudrate(9600);
$ob->parity("none");
$ob->parity_enable(1);     # for any parity except "none"
$ob->databits(8);
$ob->stopbits(1);
$ob->handshake('none');
$ob->buffers(4096, 4096);

$ob->write_settings || die "cant write settings";
$ob->save("conf.cfg");

print "wrote configuration file conf.cfg\n";

[download]

Serial.pl

use strict;
use Win32::SerialPort 0.11;

my $ob = Win32::SerialPort->start ("conf.cfg") || die;

$ob->write("abc");
$ob->write("xyz");

undef $ob;

[download]

After running this code I get a message that "Second Write attempted before First is done at Simple_serial_com.pl line 10. Use of uninitialized value $written in numeric ne (!=) at C:/Perl64/site/lib/Win 32/SerialPort.pm line 1580."

In the arduino program I am just waiting to receive for any serial data

void setup()
{
  pinMode(13,OUTPUT);
  Serial.begin(9600);
}


void loop() {
  if(Serial.available())
  {
    pinMode(13,HIGH);
  }
}

[download]

I also tried adding a delay between the two serial writes in the perl program, but also got the same error message.

Please let me know if I need to do any other configurations or if I am doing something wrong

Thanks all

I found where the issue is, 64 bit build of perl is the culprit, I installed 32 bit build and it started working

In reply to Serial communication between perl and arduino by perl_sck_58

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