terminal.sh

   1 #!/bin/bash
   2 PGM="$0"
   3 PORT="$1"
   4 CMD="$2"
   5
   6 BAUD=115200
   7
   8 chr () {
   9         printf \\$(printf '%03o' $1)
  10 }
  11
  12 led () {
  13         LED="$1"
  14         OPT="$2"
  15
  16         case "$LED" in
  17                 1|a|A) LED=0;;
  18                 2|b|B) LED=16;;
  19                 3|c|C) LED=32;;
  20                 4|d|D) LED=48;;
  21                 *)
  22                         echo "Unknown LED '$LED'"
  23                         echo "Usage: $PGM $PORT led [1aA2bB3cC4dD] {off|green|red|green+blink|red+blink}"
  24                         exit 1
  25         esac
  26
  27         case "$OPT" in
  28                 off) OPT=0;;
  29                 green) OPT=1;;
  30                 red) OPT=2;;
  31                 green+blink) OPT=5;;
  32                 red+blink) OPT=6;;
  33                 *)
  34                         echo "Unknown option '$OPT'"
  35                         echo "Usage: $PGM $PORT led [1aA2bB3cC4dD] {off|green|red|green+blink|red+blink}"
  36                         exit 1
  37         esac
  38
  39         OPT=$(($LED+$OPT))
  40
  41         (echo -ne '\x11'; chr $OPT) > "$PORT"
  42 }
  43
  44 backlight () {
  45         OPT="$1"
  46
  47         case "$OPT" in
  48                 off)
  49                         echo -ne '\x12\x00' > "$PORT"
  50                         ;;
  51                 on)
  52                         echo -ne '\x12\x01' > "$PORT"
  53                         ;;
  54                 flash)
  55                         echo -ne '\x12\x02' > "$PORT"
  56                         ;;
  57                 *)
  58                         echo "Unknown option '$OPT'"
  59                         echo "Usage: $PGM $PORT $CMD {on|off|flash}"
  60                         exit 1
  61         esac
  62 }
  63
  64 write () {
  65         echo -ne "${@:1}" > "$PORT"
  66 }
  67
  68 stty -F "$PORT" -crtscts -hupcl "$BAUD"
  69
  70 case "$CMD" in
  71         backlight|bl)
  72                 backlight "$3"
  73                 ;;
  74         led)
  75                 led "$3" "$4"
  76                 ;;
  77         write)
  78                 write "${@:3}"
  79                 ;;
  80         *)
  81                 echo "Usage: $PGM PORT {backlight|bl|led|write}"
  82                 exit 1
  83 esac