GPIO board read/write via bash
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 $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
The board is working - I can access via screen, enter same command and get results back, so I know its my fractured script. What am I doing wrong?
Note - this script was copied from elsewhere here on stackexchange.
bash stty gpio
asked 32 mins ago
alabamatoy
1
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Trying to get a GPIO board working, need to access it from script, here is what I am using:
stty -F /dev/ttyACM1 115200 raw -echo #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
echo "gpio readall" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep 5s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
The board is working - I can access via screen, enter same command and get results back, so I know its my fractured script. What am I doing wrong?
Note - this script was copied from elsewhere here on stackexchange.
bash stty gpio
asked 32 mins ago
alabamatoy
1
New contributor
alabamatoy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
When the script finishes (assuming it does), what's in yourttyDump.datfile?
– RubberStamp
16 mins ago
add a comment |
Trying to get a GPIO board working, need to access it from script, here is what I am using:
stty -F /dev/ttyACM1 115200 raw -echo #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #SAVE PID TO KILL CAT
echo "gpio readall" > /dev/ttyACM1 #SEND COMMAND STRING TO SERIAL PORT
sleep 5s #WAIT FOR RESPONSE
kill $PID #KILL CAT PROCESS
exec 3<&- #FREE FD 3
cat /tmp/ttyDump.dat #DUMP CAPTURED DATA
The board is working - I can access via screen, enter same command and get results back, so I know its my fractured script. What am I doing wrong?
Note - this script was copied from elsewhere here on stackexchange.
bash stty gpio
asked 32 mins ago
alabamatoy
1
New contributor
alabamatoy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Trying to get a GPIO board working, need to access it from script, here is what I am using:
stty -F /dev/ttyACM1 115200 raw -echo #CONFIGURE SERIAL PORT
exec 3</dev/ttyACM1 #REDIRECT SERIAL OUTPUT TO FD 3
cat <&3 > /tmp/ttyDump.dat & #REDIRECT SERIAL OUTPUT TO FILE
PID=$! #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 32 mins ago
alabamatoy
1
New contributor
alabamatoy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 32 mins ago
alabamatoy
1
New contributor
alabamatoy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 32 mins ago
alabamatoy
1
New contributor
alabamatoy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 32 mins ago
alabamatoy
1
asked 32 mins ago
alabamatoy
1
1
New contributor
alabamatoy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
alabamatoy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
alabamatoy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
When the script finishes (assuming it does), what's in yourttyDump.datfile?
– RubberStamp
16 mins ago
add a comment |
When the script finishes (assuming it does), what's in yourttyDump.datfile?
– RubberStamp
16 mins ago
When the script finishes (assuming it does), what's in your
ttyDump.dat file?– RubberStamp
16 mins ago
When the script finishes (assuming it does), what's in your
ttyDump.dat file?– RubberStamp
16 mins ago
add a comment |
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When the script finishes (assuming it does), what's in your
ttyDump.datfile?– RubberStamp
16 mins ago