initd-lcd.sh

#!/bin/sh

### BEGIN INIT INFO
# Provides:          lcd
# Required-Start:
# Required-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Update LCD display
# Description:       Update LCD display on the front of the machine.
### END INIT INFO

# ------------------------------------------------------------------------------
# Initialize local variables
# Each line will be truncated after 16 characters
# ------------------------------------------------------------------------------
SCRIPT_NAME="lcd"
LINE_ONE="Debian"
LINE_TWO="`uname -r`"

# ------------------------------------------------------------------------------
# Function: mount lcd device
# ------------------------------------------------------------------------------
mount_lcd() {
  /bin/stty -F /dev/ttyS1 1200
}

# ------------------------------------------------------------------------------
# Function: disable lcd
# ------------------------------------------------------------------------------
disable_lcd() {
  echo -e "M^\x0" > /dev/ttyS1
}

# ------------------------------------------------------------------------------
# Function: enable lcd
# ------------------------------------------------------------------------------
enable_lcd() {
  echo -e "M^\x1" > /dev/ttyS1
}

# ------------------------------------------------------------------------------
# Function: write to lcd
# Each line will be forced to 16 characters
# ------------------------------------------------------------------------------
write_to_lcd() {
  FORMATTED_LINE_ONE="`printf "%-16.16s" "${LINE_ONE}"`"
  FORMATTED_LINE_TWO="`printf "%-16.16s" "${LINE_TWO}"`"

  echo -e "M\f\x0 ${FORMATTED_LINE_ONE}" > /dev/ttyS1
  echo -e "M\f\x1 ${FORMATTED_LINE_TWO}" > /dev/ttyS1
}

# ------------------------------------------------------------------------------
# Carry out specific functions when asked to by the system
# ------------------------------------------------------------------------------
case "$1" in
  start)
    echo "Starting ${SCRIPT_NAME}"
    
    mount_lcd
    enable_lcd
    write_to_lcd
    
    ;;
  stop)
    echo "Stopping ${SCRIPT_NAME}"
    
    mount_lcd
    disable_lcd

    ;;
  *)
    echo "Usage: /etc/init.d/${SCRIPT_NAME} {start|stop}"
    exit 1
    ;;
esac

exit 0

qnap-debian-commands.sh

# First mount the LCD
stty -F /dev/ttyS1 1200

# Turn off LCD
echo -e "M^\x0" > /dev/ttyS1

# Turn on LCD
echo -e "M^\x1" > /dev/ttyS1

# Write a message to LCD
# Each line should be 16 characters, so pad with spaces if necessary
echo -e "M\f\x0 THIS IS 1st LINE" > /dev/ttyS1
echo -e "M\f\x1 THIS IS 2nd LINE" > /dev/ttyS1