GPIO board read/write via bash
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1
Trying to get a GPIO board working, need to access it from script, here is what I am using:
stty -F /dev/ttyACM1 115200 raw -echo #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
echo "gpio readall" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep 5s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
The board is working - I can access via screen, enter same command and get results back, so I know its my fractured script. What am I doing wrong?
Note - this script was copied from elsewhere here on stackexchange.
bash stty gpio
asked Dec 31 '18 at 1:26
alabamatoyalabamatoy
61
add a comment |
1
Trying to get a GPIO board working, need to access it from script, here is what I am using:
stty -F /dev/ttyACM1 115200 raw -echo #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
echo "gpio readall" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep 5s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
The board is working - I can access via screen, enter same command and get results back, so I know its my fractured script. What am I doing wrong?
Note - this script was copied from elsewhere here on stackexchange.
bash stty gpio
asked Dec 31 '18 at 1:26
alabamatoyalabamatoy
61
When the script finishes (assuming it does), what's in yourttyDump.datfile?
– RubberStamp
Dec 31 '18 at 1:42
ttyDump.dat is empty, zero length.
– alabamatoy
Dec 31 '18 at 12:02
Please edit your question to add the GPIO board's manufacturer and model so that others with the same board might also find your question and answer...
– RubberStamp
Jan 1 at 12:52
add a comment |
1
1
1
Trying to get a GPIO board working, need to access it from script, here is what I am using:
stty -F /dev/ttyACM1 115200 raw -echo #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
echo "gpio readall" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep 5s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
The board is working - I can access via screen, enter same command and get results back, so I know its my fractured script. What am I doing wrong?
Note - this script was copied from elsewhere here on stackexchange.
bash stty gpio
asked Dec 31 '18 at 1:26
alabamatoyalabamatoy
61
Trying to get a GPIO board working, need to access it from script, here is what I am using:
stty -F /dev/ttyACM1 115200 raw -echo #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
echo "gpio readall" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep 5s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
The board is working - I can access via screen, enter same command and get results back, so I know its my fractured script. What am I doing wrong?
Note - this script was copied from elsewhere here on stackexchange.
bash stty gpio
bash stty gpio
asked Dec 31 '18 at 1:26
alabamatoyalabamatoy
61
asked Dec 31 '18 at 1:26
alabamatoyalabamatoy
61
asked Dec 31 '18 at 1:26
alabamatoyalabamatoy
61
asked Dec 31 '18 at 1:26
alabamatoyalabamatoy
61
asked Dec 31 '18 at 1:26
alabamatoyalabamatoy
61
61
When the script finishes (assuming it does), what's in yourttyDump.datfile?
– RubberStamp
Dec 31 '18 at 1:42
ttyDump.dat is empty, zero length.
– alabamatoy
Dec 31 '18 at 12:02
Please edit your question to add the GPIO board's manufacturer and model so that others with the same board might also find your question and answer...
– RubberStamp
Jan 1 at 12:52
add a comment |
When the script finishes (assuming it does), what's in yourttyDump.datfile?
– RubberStamp
Dec 31 '18 at 1:42
ttyDump.dat is empty, zero length.
– alabamatoy
Dec 31 '18 at 12:02
Please edit your question to add the GPIO board's manufacturer and model so that others with the same board might also find your question and answer...
– RubberStamp
Jan 1 at 12:52
When the script finishes (assuming it does), what's in your
ttyDump.dat file?– RubberStamp
Dec 31 '18 at 1:42
When the script finishes (assuming it does), what's in your
ttyDump.dat file?– RubberStamp
Dec 31 '18 at 1:42
ttyDump.dat is empty, zero length.
– alabamatoy
Dec 31 '18 at 12:02
ttyDump.dat is empty, zero length.
– alabamatoy
Dec 31 '18 at 12:02
Please edit your question to add the GPIO board's manufacturer and model so that others with the same board might also find your question and answer...
– RubberStamp
Jan 1 at 12:52
Please edit your question to add the GPIO board's manufacturer and model so that others with the same board might also find your question and answer...
– RubberStamp
Jan 1 at 12:52
add a comment |
1 Answer
1
active
oldest
votes
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I found my problem. First, I had the tty commo configured wrong. Second, I was sending the command in a way that the GPIO board didn't know what to do with it. This works:
stty -F /dev/ttyACM1 -cstopb -crtscts cs8 9600 #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
# echo "Process ID is $PID"
printf "gpio read 0r" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep .2s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
answered Jan 1 at 1:06
alabamatoyalabamatoy
61
It might be a good idea to provide a link to the board's programming API website, if there is one....
– RubberStamp
Jan 1 at 12:53
Board MFG link is here: numato.com/docs/8-channel-usb-gpio-module-with-analog-inputs
– alabamatoy
Jan 1 at 17:58
add a comment |
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1 Answer
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1 Answer
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active
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I found my problem. First, I had the tty commo configured wrong. Second, I was sending the command in a way that the GPIO board didn't know what to do with it. This works:
stty -F /dev/ttyACM1 -cstopb -crtscts cs8 9600 #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
# echo "Process ID is $PID"
printf "gpio read 0r" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep .2s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
answered Jan 1 at 1:06
alabamatoyalabamatoy
61
It might be a good idea to provide a link to the board's programming API website, if there is one....
– RubberStamp
Jan 1 at 12:53
Board MFG link is here: numato.com/docs/8-channel-usb-gpio-module-with-analog-inputs
– alabamatoy
Jan 1 at 17:58
add a comment |
0
I found my problem. First, I had the tty commo configured wrong. Second, I was sending the command in a way that the GPIO board didn't know what to do with it. This works:
stty -F /dev/ttyACM1 -cstopb -crtscts cs8 9600 #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
# echo "Process ID is $PID"
printf "gpio read 0r" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep .2s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
answered Jan 1 at 1:06
alabamatoyalabamatoy
61
It might be a good idea to provide a link to the board's programming API website, if there is one....
– RubberStamp
Jan 1 at 12:53
Board MFG link is here: numato.com/docs/8-channel-usb-gpio-module-with-analog-inputs
– alabamatoy
Jan 1 at 17:58
add a comment |
0
0
0
I found my problem. First, I had the tty commo configured wrong. Second, I was sending the command in a way that the GPIO board didn't know what to do with it. This works:
stty -F /dev/ttyACM1 -cstopb -crtscts cs8 9600 #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
# echo "Process ID is $PID"
printf "gpio read 0r" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep .2s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
answered Jan 1 at 1:06
alabamatoyalabamatoy
61
I found my problem. First, I had the tty commo configured wrong. Second, I was sending the command in a way that the GPIO board didn't know what to do with it. This works:
stty -F /dev/ttyACM1 -cstopb -crtscts cs8 9600 #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
# echo "Process ID is $PID"
printf "gpio read 0r" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep .2s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
answered Jan 1 at 1:06
alabamatoyalabamatoy
61
answered Jan 1 at 1:06
alabamatoyalabamatoy
61
answered Jan 1 at 1:06
alabamatoyalabamatoy
61
answered Jan 1 at 1:06
alabamatoyalabamatoy
61
61
It might be a good idea to provide a link to the board's programming API website, if there is one....
– RubberStamp
Jan 1 at 12:53
Board MFG link is here: numato.com/docs/8-channel-usb-gpio-module-with-analog-inputs
– alabamatoy
Jan 1 at 17:58
add a comment |
It might be a good idea to provide a link to the board's programming API website, if there is one....
– RubberStamp
Jan 1 at 12:53
Board MFG link is here: numato.com/docs/8-channel-usb-gpio-module-with-analog-inputs
– alabamatoy
Jan 1 at 17:58
It might be a good idea to provide a link to the board's programming API website, if there is one....
– RubberStamp
Jan 1 at 12:53
It might be a good idea to provide a link to the board's programming API website, if there is one....
– RubberStamp
Jan 1 at 12:53
Board MFG link is here: numato.com/docs/8-channel-usb-gpio-module-with-analog-inputs
– alabamatoy
Jan 1 at 17:58
Board MFG link is here: numato.com/docs/8-channel-usb-gpio-module-with-analog-inputs
– alabamatoy
Jan 1 at 17:58
add a comment |
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When the script finishes (assuming it does), what's in your
ttyDump.datfile?– RubberStamp
Dec 31 '18 at 1:42
ttyDump.dat is empty, zero length.
– alabamatoy
Dec 31 '18 at 12:02
Please edit your question to add the GPIO board's manufacturer and model so that others with the same board might also find your question and answer...
– RubberStamp
Jan 1 at 12:52