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CDC ACM doesn't work in a custom linux kernel
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I've a cubieboard2 running arch linux with a custom linux kernel.
In the cubieboard2 I plugged in my usb-serial device (like an arduino), the device is recognized as CDC ACM. My linux kernel has the CDC options enabled in the configuration, as I saw in this page, but, I can't use the serial port /dev/ttyACM0 using the applications minicom or pyserial.
Minicom just says that it can't open the serial port. Pyserial is able to open the port, but when I try reading it the result is:
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
Yet in pyserial if I try to write a byte the result is other:
SerialException: write failed: [Errno 5] Input/output error.
Other weird things happen when I close the serial port, it changes its name, in other words, when I close the /dev/ttyACM0 it changes to /dev/ttyACM1.
I've tried my device in my laptop and it works fine with both, pyserial and minicom.
cubieboard2 info:
$ uname -a
Linux alarm 3.4.61-rt77-ARCH+ #10 SMP PREEMPT RT Thu Apr 17 13:58:20 BRT 2014 armv7l GNU/Linux
my kernel config file: http://pastebin.com/raw.php?i=6LfsRyek
My guess is that it's missing having some kernel option enabled, but I don't know which.
Any idea?
linux-kernel usb cubieboard
edited 55 mins ago
mosvy
17.8k2 gold badges24 silver badges55 bronze badges
asked Apr 17 '14 at 20:25
Ricardo CrudoRicardo Crudo
231 gold badge1 silver badge5 bronze badges
add a comment
|
I've a cubieboard2 running arch linux with a custom linux kernel.
In the cubieboard2 I plugged in my usb-serial device (like an arduino), the device is recognized as CDC ACM. My linux kernel has the CDC options enabled in the configuration, as I saw in this page, but, I can't use the serial port /dev/ttyACM0 using the applications minicom or pyserial.
Minicom just says that it can't open the serial port. Pyserial is able to open the port, but when I try reading it the result is:
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
Yet in pyserial if I try to write a byte the result is other:
SerialException: write failed: [Errno 5] Input/output error.
Other weird things happen when I close the serial port, it changes its name, in other words, when I close the /dev/ttyACM0 it changes to /dev/ttyACM1.
I've tried my device in my laptop and it works fine with both, pyserial and minicom.
cubieboard2 info:
$ uname -a
Linux alarm 3.4.61-rt77-ARCH+ #10 SMP PREEMPT RT Thu Apr 17 13:58:20 BRT 2014 armv7l GNU/Linux
my kernel config file: http://pastebin.com/raw.php?i=6LfsRyek
My guess is that it's missing having some kernel option enabled, but I don't know which.
Any idea?
linux-kernel usb cubieboard
edited 55 mins ago
mosvy
17.8k2 gold badges24 silver badges55 bronze badges
asked Apr 17 '14 at 20:25
Ricardo CrudoRicardo Crudo
231 gold badge1 silver badge5 bronze badges
add a comment
|
I've a cubieboard2 running arch linux with a custom linux kernel.
In the cubieboard2 I plugged in my usb-serial device (like an arduino), the device is recognized as CDC ACM. My linux kernel has the CDC options enabled in the configuration, as I saw in this page, but, I can't use the serial port /dev/ttyACM0 using the applications minicom or pyserial.
Minicom just says that it can't open the serial port. Pyserial is able to open the port, but when I try reading it the result is:
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
Yet in pyserial if I try to write a byte the result is other:
SerialException: write failed: [Errno 5] Input/output error.
Other weird things happen when I close the serial port, it changes its name, in other words, when I close the /dev/ttyACM0 it changes to /dev/ttyACM1.
I've tried my device in my laptop and it works fine with both, pyserial and minicom.
cubieboard2 info:
$ uname -a
Linux alarm 3.4.61-rt77-ARCH+ #10 SMP PREEMPT RT Thu Apr 17 13:58:20 BRT 2014 armv7l GNU/Linux
my kernel config file: http://pastebin.com/raw.php?i=6LfsRyek
My guess is that it's missing having some kernel option enabled, but I don't know which.
Any idea?
linux-kernel usb cubieboard
edited 55 mins ago
mosvy
17.8k2 gold badges24 silver badges55 bronze badges
asked Apr 17 '14 at 20:25
Ricardo CrudoRicardo Crudo
231 gold badge1 silver badge5 bronze badges
I've a cubieboard2 running arch linux with a custom linux kernel.
In the cubieboard2 I plugged in my usb-serial device (like an arduino), the device is recognized as CDC ACM. My linux kernel has the CDC options enabled in the configuration, as I saw in this page, but, I can't use the serial port /dev/ttyACM0 using the applications minicom or pyserial.
Minicom just says that it can't open the serial port. Pyserial is able to open the port, but when I try reading it the result is:
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
Yet in pyserial if I try to write a byte the result is other:
SerialException: write failed: [Errno 5] Input/output error.
Other weird things happen when I close the serial port, it changes its name, in other words, when I close the /dev/ttyACM0 it changes to /dev/ttyACM1.
I've tried my device in my laptop and it works fine with both, pyserial and minicom.
cubieboard2 info:
$ uname -a
Linux alarm 3.4.61-rt77-ARCH+ #10 SMP PREEMPT RT Thu Apr 17 13:58:20 BRT 2014 armv7l GNU/Linux
my kernel config file: http://pastebin.com/raw.php?i=6LfsRyek
My guess is that it's missing having some kernel option enabled, but I don't know which.
Any idea?
linux-kernel usb cubieboard
linux-kernel usb cubieboard
edited 55 mins ago
mosvy
17.8k2 gold badges24 silver badges55 bronze badges
asked Apr 17 '14 at 20:25
Ricardo CrudoRicardo Crudo
231 gold badge1 silver badge5 bronze badges
edited 55 mins ago
mosvy
17.8k2 gold badges24 silver badges55 bronze badges
asked Apr 17 '14 at 20:25
Ricardo CrudoRicardo Crudo
231 gold badge1 silver badge5 bronze badges
edited 55 mins ago
mosvy
17.8k2 gold badges24 silver badges55 bronze badges
edited 55 mins ago
mosvy
17.8k2 gold badges24 silver badges55 bronze badges
edited 55 mins ago
mosvy
17.8k2 gold badges24 silver badges55 bronze badges
17.8k2 gold badges24 silver badges55 bronze badges
asked Apr 17 '14 at 20:25
Ricardo CrudoRicardo Crudo
231 gold badge1 silver badge5 bronze badges
asked Apr 17 '14 at 20:25
Ricardo CrudoRicardo Crudo
231 gold badge1 silver badge5 bronze badges
asked Apr 17 '14 at 20:25
Ricardo CrudoRicardo Crudo
231 gold badge1 silver badge5 bronze badges
231 gold badge1 silver badge5 bronze badges
add a comment
|
add a comment
|
1 Answer
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It seems to me that the problem is your device. It might enumerate OK, but behaves unexpectedly when further communications are performed. Try using Wireshark with usbmon (eventually tshark if you don't have an X session). The ttyACM1 name is usually due to re-enumeration after a faulty communication.
answered Jul 25 '15 at 12:01
CaerbannogCaerbannog
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1 Answer
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1 Answer
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It seems to me that the problem is your device. It might enumerate OK, but behaves unexpectedly when further communications are performed. Try using Wireshark with usbmon (eventually tshark if you don't have an X session). The ttyACM1 name is usually due to re-enumeration after a faulty communication.
answered Jul 25 '15 at 12:01
CaerbannogCaerbannog
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add a comment
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It seems to me that the problem is your device. It might enumerate OK, but behaves unexpectedly when further communications are performed. Try using Wireshark with usbmon (eventually tshark if you don't have an X session). The ttyACM1 name is usually due to re-enumeration after a faulty communication.
answered Jul 25 '15 at 12:01
CaerbannogCaerbannog
1
add a comment
|
It seems to me that the problem is your device. It might enumerate OK, but behaves unexpectedly when further communications are performed. Try using Wireshark with usbmon (eventually tshark if you don't have an X session). The ttyACM1 name is usually due to re-enumeration after a faulty communication.
answered Jul 25 '15 at 12:01
CaerbannogCaerbannog
1
It seems to me that the problem is your device. It might enumerate OK, but behaves unexpectedly when further communications are performed. Try using Wireshark with usbmon (eventually tshark if you don't have an X session). The ttyACM1 name is usually due to re-enumeration after a faulty communication.
answered Jul 25 '15 at 12:01
CaerbannogCaerbannog
1
answered Jul 25 '15 at 12:01
CaerbannogCaerbannog
1
answered Jul 25 '15 at 12:01
CaerbannogCaerbannog
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answered Jul 25 '15 at 12:01
CaerbannogCaerbannog
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