Simple script for sending and reading serial data from your Arduino on *nix systems

arduino-com

#!/bin/bash

# Configuration
DEVICE=/dev/ttyACM0
BAUD=9600
SEND=""
FOLLOW=0
RECEIVE=0
HELP=0

# Utility functions
function print_instructions {
	echo "Usage:"
	echo "  $0 [-d|--device DEVICE] [-b|--baud BAUD] [-f|--follow] [receive|send data]"
	echo "  Note: If no device is specified '$DEVICE' is used as the default."
	echo "        If no BAUD rate is specified '$BAUD' is used as the default."
	echo "Examples:"
	echo "  Sending data:"
	echo "    $0 -d /dev/ttyACM1 send \"Hello world!\""
	echo "  Receiving data:"
	echo "    $0 -b 11600 receive"
	echo ""
}

# Read options
while [[ $# -gt 0 ]]
do
key="$1"

case $key in
	-b|--baud)
	BAUD="$2"
	shift
	;;
	-d|--device)
	DEVICE="$2"
	shift
	;;
	send)
	SEND="$2"
	shift
	;;
	receive)
	RECEIVE=1
	shift
	;;
	-f|--follow)
	FOLLOW=1
	;;
	--help)
	HELP=1
	;;
	*)
	# unknown option
	;;
esac
shift # past argument or value
done

# Check inputs
if [ "$HELP" -eq 1 ]; then
	print_instructions
	exit 0
fi

if [ "$SEND" == "" ] && [ "$RECEIVE" -eq 0 ]; then
	echo "A data transfer method has to be specified!"
	echo "Data has to be eather sent or received."
	echo "Use the 'send' or 'receive' commands to specify data flow."
	echo ""
	print_instructions
	exit 1
fi

# Initialization
echo "Initializing device..."
stty -F $DEVICE cs8 $BAUD ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts

# Execution
if [ "$SEND" != "" ]; then
	echo "Sending data..."
	echo "$SEND" > $DEVICE
	
	if [ "$FOLLOW" -eq 1 ]; then
		echo "Following output"
		echo "-------------------------------------"
		cat < $DEVICE
	fi
fi

if [ "$RECEIVE" -eq 1 ]; then
	echo "Receiving data..."
	echo "-------------------------------------"
	cat < $DEVICE
fi