git://stoneship.org.uk / onewire / blame
| Commit | Line | Data |
|---|---|---|
| bba33fe1 JM |
1 | #!/bin/bash |
| 2 | ||
| 3 | DEV=/dev/ttyUSB0 | |
| 4 | TIMEOUT=5 | |
| 5 | LOCK=/var/tmp/readtemp.lock | |
| 6 | ||
| 7 | SYSDEV=/sys/bus/usb/devices | |
| 8 | for i in $SYSDEV/* | |
| 9 | do | |
| 10 | if [ -f "$i/interface" ] | |
| 11 | then | |
| 12 | if grep -q "CP2102 USB to UART" "$i/interface" | |
| 13 | then | |
| 14 | DEV=/dev/$(basename `ls -d $i/ttyUSB* `) | |
| 15 | # dont break here, keep going so we get the last one | |
| 16 | # break | |
| 17 | fi | |
| 18 | fi | |
| 19 | done | |
| 20 | ||
| 21 | if ! lockfile -r 3 -l 5 $LOCK | |
| 22 | then | |
| 23 | echo "Failed to obtain lock" | |
| 24 | exit; | |
| 25 | fi | |
| 26 | ||
| 27 | if ! stty --file=$DEV | grep -q 'speed 19200' | |
| 28 | then | |
| 29 | stty --file=$DEV 19200 | |
| 30 | sleep 1 | |
| 31 | fi | |
| 32 | ||
| 33 | if ! stty --file=$DEV | grep -q '-echo' | |
| 34 | then | |
| 35 | stty --file=$DEV -echo | |
| 36 | sleep 1 | |
| 37 | fi | |
| 38 | ||
| 39 | echo -n "t" >> $DEV | |
| 40 | ||
| 41 | MODE=plain | |
| 42 | if [ $# -ge 1 ] && [ "$1" == "-c" ]; then | |
| 43 | MODE=cacti | |
| 44 | fi | |
| 45 | ||
| 46 | while read -t $TIMEOUT -u 3 CODE ID TEM OTH; do | |
| 47 | # last one | |
| 48 | if [ "$CODE" == "END" ]; then | |
| 49 | break; | |
| 50 | fi | |
| 51 | ||
| 52 | # not a valid line | |
| 53 | if [ "$CODE" != "TEMP" ]; then | |
| 54 | echo "ERROR CODE=$CODE ID=$ID TEM=$TEM" | |
| 55 | continue; | |
| 56 | fi | |
| 57 | ||
| 58 | # truncate for paranoia | |
| 59 | TEM=${TEM:0:4} | |
| 60 | ||
| 61 | # calculate degrees from the hex code | |
| 62 | DEGC=`echo "16 i $TEM A i 4 k 0.0625 * p" | dc` | |
| 63 | # display the result | |
| 64 | if [ $MODE == "cacti" ]; then | |
| 65 | printf "id:%s temp:%s\n", "$ID" "$DEGC" | |
| 66 | else | |
| 67 | printf "%s %s degC\n" "$ID" "$DEGC"; | |
| 68 | fi | |
| 69 | done 3< $DEV | |
| 70 | ||
| 71 | rm -f $LOCK |