can I change or eliminate default text console for ubuntu
I am using an embedded ubuntu based processor as a machine vision system. It communicates over 2 serial ports with an associated flight controller.
My problem is that one of these ports (/dev/ttyS2) is also designated by the system as the default text console. Under some circumstances the dual use causes problems. Most notably, the normal open(), close() calls supporting the vision<->flight controller communications cause stdin calls (fgets(), scanf(), etc) to fail.
I log in to the ubuntu system using ssh over wifi. I configure this by altering the installed rootfs - so never have a need for the serial console.
Is there a way to either disable this port's use as the default console, or programatically reassign stdin to the ssh/wifi console?
thanks
linux ubuntu serial-console
asked 3 hours ago
sneimansneiman
61
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I am using an embedded ubuntu based processor as a machine vision system. It communicates over 2 serial ports with an associated flight controller.
My problem is that one of these ports (/dev/ttyS2) is also designated by the system as the default text console. Under some circumstances the dual use causes problems. Most notably, the normal open(), close() calls supporting the vision<->flight controller communications cause stdin calls (fgets(), scanf(), etc) to fail.
I log in to the ubuntu system using ssh over wifi. I configure this by altering the installed rootfs - so never have a need for the serial console.
Is there a way to either disable this port's use as the default console, or programatically reassign stdin to the ssh/wifi console?
thanks
linux ubuntu serial-console
asked 3 hours ago
sneimansneiman
61
New contributor
sneiman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
"Reading suggests thatsttysets stdin to the port being configured" - not in my experience. What should happen is thatsttyconfigures the line attached to its stdin. I've also known systems reset the line characteristics when all file descriptors to that device are closed (effectively negating a naivestty ... </dev/ttyXXbut I have no way of confirming if that also applies to Linux-based systems.
– roaima
2 hours ago
roaima's comment regarding stdin being set seem correct to me. I took my interpretation from man stty - but it clearly says something different than my original interpretation. I have edited question to avoid confusion.
– sneiman
1 hour ago
add a comment |
I am using an embedded ubuntu based processor as a machine vision system. It communicates over 2 serial ports with an associated flight controller.
My problem is that one of these ports (/dev/ttyS2) is also designated by the system as the default text console. Under some circumstances the dual use causes problems. Most notably, the normal open(), close() calls supporting the vision<->flight controller communications cause stdin calls (fgets(), scanf(), etc) to fail.
I log in to the ubuntu system using ssh over wifi. I configure this by altering the installed rootfs - so never have a need for the serial console.
Is there a way to either disable this port's use as the default console, or programatically reassign stdin to the ssh/wifi console?
thanks
linux ubuntu serial-console
asked 3 hours ago
sneimansneiman
61
New contributor
sneiman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am using an embedded ubuntu based processor as a machine vision system. It communicates over 2 serial ports with an associated flight controller.
My problem is that one of these ports (/dev/ttyS2) is also designated by the system as the default text console. Under some circumstances the dual use causes problems. Most notably, the normal open(), close() calls supporting the vision<->flight controller communications cause stdin calls (fgets(), scanf(), etc) to fail.
I log in to the ubuntu system using ssh over wifi. I configure this by altering the installed rootfs - so never have a need for the serial console.
Is there a way to either disable this port's use as the default console, or programatically reassign stdin to the ssh/wifi console?
thanks
linux ubuntu serial-console
linux ubuntu serial-console
asked 3 hours ago
sneimansneiman
61
New contributor
sneiman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
sneimansneiman
61
New contributor
sneiman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 42 secs ago
sneiman
asked 3 hours ago
sneimansneiman
61
New contributor
sneiman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
sneimansneiman
61
asked 3 hours ago
sneimansneiman
61
61
New contributor
sneiman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
sneiman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
sneiman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
"Reading suggests thatsttysets stdin to the port being configured" - not in my experience. What should happen is thatsttyconfigures the line attached to its stdin. I've also known systems reset the line characteristics when all file descriptors to that device are closed (effectively negating a naivestty ... </dev/ttyXXbut I have no way of confirming if that also applies to Linux-based systems.
– roaima
2 hours ago
roaima's comment regarding stdin being set seem correct to me. I took my interpretation from man stty - but it clearly says something different than my original interpretation. I have edited question to avoid confusion.
– sneiman
1 hour ago
add a comment |
"Reading suggests thatsttysets stdin to the port being configured" - not in my experience. What should happen is thatsttyconfigures the line attached to its stdin. I've also known systems reset the line characteristics when all file descriptors to that device are closed (effectively negating a naivestty ... </dev/ttyXXbut I have no way of confirming if that also applies to Linux-based systems.
– roaima
2 hours ago
roaima's comment regarding stdin being set seem correct to me. I took my interpretation from man stty - but it clearly says something different than my original interpretation. I have edited question to avoid confusion.
– sneiman
1 hour ago
"Reading suggests that
stty sets stdin to the port being configured" - not in my experience. What should happen is that stty configures the line attached to its stdin. I've also known systems reset the line characteristics when all file descriptors to that device are closed (effectively negating a naive stty ... </dev/ttyXX but I have no way of confirming if that also applies to Linux-based systems.– roaima
2 hours ago
"Reading suggests that
stty sets stdin to the port being configured" - not in my experience. What should happen is that stty configures the line attached to its stdin. I've also known systems reset the line characteristics when all file descriptors to that device are closed (effectively negating a naive stty ... </dev/ttyXX but I have no way of confirming if that also applies to Linux-based systems.– roaima
2 hours ago
roaima's comment regarding stdin being set seem correct to me. I took my interpretation from man stty - but it clearly says something different than my original interpretation. I have edited question to avoid confusion.
– sneiman
1 hour ago
roaima's comment regarding stdin being set seem correct to me. I took my interpretation from man stty - but it clearly says something different than my original interpretation. I have edited question to avoid confusion.
– sneiman
1 hour ago
add a comment |
1 Answer
1
active
oldest
votes
If all you want to do is to set the terminal line characteristics and have them stick, try this
# Serial line
tty=/dev/ttyS1
# Open the serial port and hold it open
sleep 300 <$tty &
slpid=$!
# Set the characteristics and run the serial port code
stty 19200... <$tty
/run/your/program
# Clean up
kill $slpid 2>/dev/null
answered 1 hour ago
roaimaroaima
42.9k551116
Thanks for this. It works of course, but is not my actual problem. The more I think about it, I think the kernel has stolen /dev/ttyS2 for its default text console, and I just have to figure out how to change that. There are no grub files unfortunately. I am going to close the question, and ask a better one, unless you object. seth
– sneiman
15 mins ago
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
votes
If all you want to do is to set the terminal line characteristics and have them stick, try this
# Serial line
tty=/dev/ttyS1
# Open the serial port and hold it open
sleep 300 <$tty &
slpid=$!
# Set the characteristics and run the serial port code
stty 19200... <$tty
/run/your/program
# Clean up
kill $slpid 2>/dev/null
answered 1 hour ago
roaimaroaima
42.9k551116
Thanks for this. It works of course, but is not my actual problem. The more I think about it, I think the kernel has stolen /dev/ttyS2 for its default text console, and I just have to figure out how to change that. There are no grub files unfortunately. I am going to close the question, and ask a better one, unless you object. seth
– sneiman
15 mins ago
add a comment |
If all you want to do is to set the terminal line characteristics and have them stick, try this
# Serial line
tty=/dev/ttyS1
# Open the serial port and hold it open
sleep 300 <$tty &
slpid=$!
# Set the characteristics and run the serial port code
stty 19200... <$tty
/run/your/program
# Clean up
kill $slpid 2>/dev/null
answered 1 hour ago
roaimaroaima
42.9k551116
Thanks for this. It works of course, but is not my actual problem. The more I think about it, I think the kernel has stolen /dev/ttyS2 for its default text console, and I just have to figure out how to change that. There are no grub files unfortunately. I am going to close the question, and ask a better one, unless you object. seth
– sneiman
15 mins ago
add a comment |
If all you want to do is to set the terminal line characteristics and have them stick, try this
# Serial line
tty=/dev/ttyS1
# Open the serial port and hold it open
sleep 300 <$tty &
slpid=$!
# Set the characteristics and run the serial port code
stty 19200... <$tty
/run/your/program
# Clean up
kill $slpid 2>/dev/null
answered 1 hour ago
roaimaroaima
42.9k551116
If all you want to do is to set the terminal line characteristics and have them stick, try this
# Serial line
tty=/dev/ttyS1
# Open the serial port and hold it open
sleep 300 <$tty &
slpid=$!
# Set the characteristics and run the serial port code
stty 19200... <$tty
/run/your/program
# Clean up
kill $slpid 2>/dev/null
answered 1 hour ago
roaimaroaima
42.9k551116
answered 1 hour ago
roaimaroaima
42.9k551116
answered 1 hour ago
roaimaroaima
42.9k551116
answered 1 hour ago
roaimaroaima
42.9k551116
42.9k551116
Thanks for this. It works of course, but is not my actual problem. The more I think about it, I think the kernel has stolen /dev/ttyS2 for its default text console, and I just have to figure out how to change that. There are no grub files unfortunately. I am going to close the question, and ask a better one, unless you object. seth
– sneiman
15 mins ago
add a comment |
Thanks for this. It works of course, but is not my actual problem. The more I think about it, I think the kernel has stolen /dev/ttyS2 for its default text console, and I just have to figure out how to change that. There are no grub files unfortunately. I am going to close the question, and ask a better one, unless you object. seth
– sneiman
15 mins ago
Thanks for this. It works of course, but is not my actual problem. The more I think about it, I think the kernel has stolen /dev/ttyS2 for its default text console, and I just have to figure out how to change that. There are no grub files unfortunately. I am going to close the question, and ask a better one, unless you object. seth
– sneiman
15 mins ago
Thanks for this. It works of course, but is not my actual problem. The more I think about it, I think the kernel has stolen /dev/ttyS2 for its default text console, and I just have to figure out how to change that. There are no grub files unfortunately. I am going to close the question, and ask a better one, unless you object. seth
– sneiman
15 mins ago
add a comment |
sneiman is a new contributor. Be nice, and check out our Code of Conduct.
sneiman is a new contributor. Be nice, and check out our Code of Conduct.
sneiman is a new contributor. Be nice, and check out our Code of Conduct.
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"Reading suggests that
sttysets stdin to the port being configured" - not in my experience. What should happen is thatsttyconfigures the line attached to its stdin. I've also known systems reset the line characteristics when all file descriptors to that device are closed (effectively negating a naivestty ... </dev/ttyXXbut I have no way of confirming if that also applies to Linux-based systems.– roaima
2 hours ago
roaima's comment regarding stdin being set seem correct to me. I took my interpretation from man stty - but it clearly says something different than my original interpretation. I have edited question to avoid confusion.
– sneiman
1 hour ago