set hdmi matrix output

set-matrix.sh

#!/bin/bash
# Set matrix spliter display
# Designed for Monoprice 4x4 Matrix Switch
# http://www.monoprice.com/Product?p_id=5704

declare -A INPUT_HASH
declare -A OUTPUT_HASH
CHECKSUM='\xd5\x7b'

if [[ $# -eq 0 ]] && [ -z $MATRIX_CONFIG ]; then
  set -- "--help"
  echo "No options passed and \$MATRIX_CONFIG not set."
  echo "Showing help"
fi

while [[ $# -ge 1 ]]
do
  option="$1"
  
  case $option in
    -h|--help)
      echo ""
      echo "-h: show help"
      echo ""
      echo "-f: set input file"
      echo "input file should say which output (in order abcd) should be set"
      echo "-f will override MATRIX_CONFIG environment variable"
      echo "e.g. 1231 (no spaces)"
      echo ""
      echo "-p: set serial port"
      echo "e.g. /dev/ttyS0 (default)"
      echo ""
      echo "0: turn off device (only disables output, device can still be controlled)"
      echo ""
      echo "[1234abcdABCD] set input/output separated by a space"
      echo " doesn't need to be in order, just separated by space"
      echo "e.g. 1 a b 3 c 2 4 d"
      echo ""
      echo "run examples:"
      echo "sudo ./set-matrix.sh 1 a"
      echo "sudo ./set-matrix.sh a 4 b 2 c 4 d 1"
      echo "sudo ./set-matrix.sh -f $(hostname)"
      echo "sudo ./set-matrix.sh -p /dev/ttyS1 2 b 3 c"
      echo "# get verbose output"
      echo "VERBOSE=1 sudo ./set-matrix.sh 1 c"
      echo "# set config file from environment variable"
      echo "MAXTRIX_CONFIG=$(hostname) sudo ./set-matrix.sh"
      exit 0
      ;;
    -f|--file)
      FILE="${2}"
      shift
      ;;
    1|2|3|4)
      INPUT_HASH[$2]=$1
      shift
      ;;
    a|b|c|d|A|B|C|D)
      INPUT_HASH[$1]=$2
      shift
      ;;
    -p|--port)
      PORT="${2}"
      shift
      ;;
    0)
      OUTPUT_HASH["0"]='\x10\xef'$CHECKSUM
      ;;
    *)
      echo "Unknown option $1"
      exit
      ;;
  esac
  shift
done

# use -f or $MATRIX_CONFIG env variable
FILE=${FILE:-$MATRIX_CONFIG}
PORT=${PORT:-/dev/ttyS0}

# get config from file
if [ -n "$FILE" ]; then
  # read input file
  if [[ $VERBOSE ]]; then echo "Input File = $FILE"; fi
  j=0
  array=( a b c d )
  while IFS= read -r -n1 OUTPUT
  do
    if [ -n "$OUTPUT" ]; then
      INPUT_HASH[${array[j]}]=$OUTPUT
    fi
    j=$((j + 1))
  done < ${FILE}
fi

# set output hex based on input values
for i in "${!INPUT_HASH[@]}"; do
  if [[ $VERBOSE ]]; then echo "output $i = input ${INPUT_HASH[$i]}"; fi
case $i in
  a|A)
    case ${INPUT_HASH["a"]} in
      1)
        OUTPUT_HASH["a"]='\x00\xff'$CHECKSUM
        ;;
      2)
        OUTPUT_HASH["a"]='\x01\xfe'$CHECKSUM
        ;;
      3)
        OUTPUT_HASH["a"]='\x02\xfd'$CHECKSUM
        ;;
      4)
        OUTPUT_HASH["a"]='\x03\xfc'$CHECKSUM
        ;;
    esac
    ;;
  b|B)
    case ${INPUT_HASH["b"]} in
      1)
        OUTPUT_HASH["b"]='\x04\xfb'$CHECKSUM
        ;;
      2)
        OUTPUT_HASH["b"]='\x05\xfa'$CHECKSUM
        ;;
      3)
        OUTPUT_HASH["b"]='\x06\xf9'$CHECKSUM
        ;;
      4)
        OUTPUT_HASH["b"]='\x07\xf8'$CHECKSUM
        ;;
    esac
    ;;
  c|C)
    case ${INPUT_HASH["c"]} in
      1)
        OUTPUT_HASH["c"]='\x08\xf7'$CHECKSUM
        ;;
      2)
        OUTPUT_HASH["c"]='\x09\xf6'$CHECKSUM
        ;;
      3)
        OUTPUT_HASH["c"]='\x0a\xf5'$CHECKSUM
        ;;
      4)
        OUTPUT_HASH["c"]='\x0b\xf4'$CHECKSUM
        ;;
    esac
    ;;
  d|D)
    case ${INPUT_HASH["d"]} in
      1)
        OUTPUT_HASH["d"]='\x0c\xf3'$CHECKSUM
        ;;
      2)
        OUTPUT_HASH["d"]='\x0d\xf2'$CHECKSUM
        ;;
      3)
        OUTPUT_HASH["d"]='\x0e\xf1'$CHECKSUM
        ;;
      4)
        OUTPUT_HASH["d"]='\x0f\xf0'$CHECKSUM
        ;;
    esac
    ;;
esac
done

if [[ $VERBOSE ]]; then echo "Serial port = $PORT"; fi

if [[ $(id -u) -ne 0 ]] ; then echo "Please run with sudo" ; exit 1 ; fi

# run the main loop to set input and output
for x in ${!OUTPUT_HASH[@]}; do
  if [[ $VERBOSE ]]; then printf "echo -ne '%s' > ${PORT}\n" ${OUTPUT_HASH[$x]}; fi
  echo -ne "${OUTPUT_HASH["$x"]}" > ${PORT}
  # device requires 50ms wait
  sleep 1s
done