Commit | Line | Data |
---|---|---|
4eb6c240 TM |
1 | #!/bin/sh |
2 | #Serial line tester, should work in busybox ash | |
3 | #(c) Tomas Mudrunka 2022-2024 | |
55d43182 | 4 | |
4eb6c240 TM |
5 | trylimit=0 |
6 | seconds=0 | |
7 | baudrate=115200 | |
8 | workaround_rs485=false | |
9 | ||
10 | while getopts ":t:r:b:l:s:w" OPT; do | |
11 | #echo "$OPT ==> $OPTARG"; | |
12 | case $OPT in | |
13 | t) port_tx=$OPTARG;; | |
14 | r) port_rx=$OPTARG;; | |
15 | b) baudrate=$OPTARG;; | |
16 | l) trylimit=$OPTARG;; | |
17 | s) seconds=$OPTARG;; | |
18 | w) workaround_rs485=true;; | |
19 | ||
20 | '?') echo "Usage: $0 -t /dev/ttyTX [-r /dev/ttyRX] [-b 9600] [-l 10] [-s 10] [-w]" >&2; exit 250;; | |
21 | ':') echo "Missing option argument for -$OPTARG" >&2; exit 251;; | |
22 | * ) echo "Unimplemented option: -$OPT" >&2; exit 252;; | |
23 | esac | |
24 | done | |
25 | ||
26 | [ -z "$port_tx" ] && port_tx="$port_rx" | |
27 | [ -z "$port_rx" ] && port_rx="$port_tx" | |
28 | [ -z "$port_rx" ] && { echo Port not specified; exit 253; } | |
55d43182 | 29 | |
55d43182 TM |
30 | |
31 | testdata="${RANDOM}d82b2ae45432e7c80699852ab557b279c42180a379711aae85487bda0cc58602f65c0ab5af0d510d6ac1606c52f887f3332052f67c45212dbbf2730${RANDOM}" | |
32 | ||
4eb6c240 TM |
33 | echo "Running $baudrate baud loopback test on $port_tx -> $port_rx" |
34 | echo "Limiting to $trylimit iterations and $seconds seconds (0 = no limit)" | |
55d43182 | 35 | |
4eb6c240 TM |
36 | stty -F "$port_tx" raw -echo "$baudrate" |
37 | stty -F "$port_rx" raw -echo "$baudrate" | |
55d43182 TM |
38 | |
39 | exec 5>"$port_tx" | |
40 | exec 6<"$port_rx" | |
41 | ||
4eb6c240 TM |
42 | $workaround_rs485 && { |
43 | echo "Deasserting RTS on buggy RS485 drivers by writing to RX port" | |
44 | echo>"$port_rx" | |
45 | read -rst 1 -u 6 | |
46 | } | |
47 | ||
55d43182 | 48 | errcnt=0 |
4eb6c240 TM |
49 | trycnt=0 |
50 | datestart="$(date +%s)" | |
51 | dateend="$(($datestart+$seconds))" | |
55d43182 TM |
52 | while true; do |
53 | echo "$testdata" >&5 | |
54 | unset line | |
55 | read -rst 1 -u 6 line | |
56 | #echo "LINE: $line" | |
57 | [ "$line" != "$testdata" ] && { | |
55d43182 | 58 | echo -e "$(date +'%D %T')\t$errcnt\tError receiving data $port_tx -> $port_rx" |
4eb6c240 TM |
59 | } && errcnt=$((errcnt+1)) |
60 | trycnt=$((trycnt+1)) | |
61 | #echo "try $trycnt err $errcnt lim $trylimit" | |
62 | [ $trylimit -gt 0 -a $trycnt -gt $trylimit ] && break | |
63 | [ $seconds -gt 0 ] && [ $(date +%s) -gt $dateend ] && break | |
55d43182 TM |
64 | done |
65 | ||
66 | exec 5>&- | |
67 | exec 6<&- | |
4eb6c240 TM |
68 | |
69 | echo TRANSMITTED: $trycnt, ERRORS: $errcnt, SECONDS: $(($(date +%s)-$datestart)) | |
70 | [ "$errcnt" = "0" -a "$trycnt" -gt 0 ] && exit 0 | |
71 | exit 255 |