d128f99a6959a74489ca5f29c33774e3f1523ea1
3 #Serial line tester v0.3
4 #(c) Tomas Mudrunka 2022-2024
6 #Tested in: busybox ash, bash
11 workaround_rs485
=false
13 while getopts ":t:r:b:l:s:w" OPT
; do
14 #echo "$OPT ==> $OPTARG";
21 w
) workaround_rs485
=true
;;
23 '?') echo "Usage: $0 -t /dev/ttyTX [-r /dev/ttyRX] [-b 9600] [-l 10] [-s 10] [-w]" >&2; exit 250;;
24 ':') echo "Missing option argument for -$OPTARG" >&2; exit 251;;
25 * ) echo "Unimplemented option: -$OPT" >&2; exit 252;;
29 [ -z "$port_tx" ] && port_tx
="$port_rx"
30 [ -z "$port_rx" ] && port_rx
="$port_tx"
31 [ -z "$port_rx" ] && { echo Port not specified
; exit 253; }
34 testdata
="${RANDOM}d82b2ae45432e7c80699852ab557b279c42180a379711aae85487bda0cc58602f65c0ab5af0d510d6ac1606c52f887f3332052f67c45212dbbf2730${RANDOM}"
36 echo "Running $baudrate baud loopback test on $port_tx -> $port_rx"
37 echo "Limiting to $trylimit iterations and $seconds seconds (0 = no limit)"
39 stty
-F "$port_tx" raw
-echo "$baudrate"
40 stty
-F "$port_rx" raw
-echo "$baudrate"
45 $workaround_rs485 && {
46 echo "Deasserting RTS on buggy RS485 drivers by writing to RX port"
53 datestart
="$(date +%s)"
54 dateend
="$(($datestart+$seconds))"
60 [ "$line" != "$testdata" ] && errcnt
=$
((errcnt
+1)) &&
61 echo -e "$(date +'%D %T')\t$errcnt\tError receiving data $port_tx -> $port_rx"
63 #echo "try $trycnt err $errcnt lim $trylimit"
64 [ $trylimit -gt 0 -a $trycnt -gt $trylimit ] && break
65 [ $seconds -gt 0 ] && [ $
(date +%s
) -gt $dateend ] && break
71 echo TRANSMITTED
: $trycnt, ERRORS
: $errcnt, SECONDS
: $
(($
(date +%s
)-$datestart))
72 [ "$errcnt" = "0" -a "$trycnt" -gt 0 ] && exit 0
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