Konstantin Shkolnyy <Konstantin.Shkolnyy@...> writes:
> Just a wild guess - this 30-second delay before close can happen because
usbserial is waiting for data to be
> transmitted, before closing the port.
> If you know that your data have been transmitted, perhaps you didn't
properly tell usbserial that your
> write operation has finished.
Konstantin
thank you for your suggestion.
I have implemented a dedicated write routine for the driver, and it is
returning the value 11 (for 11 sent characters downstream). The urb ia then
put back into the pool, and then the blocking starts. stty -f /dev/ttyUSB0
300 seems never to finish, while echo "0123456789" > /dev/ttyUSB0
reproducibly finish after 30 seconds. I will post the complete source code
in response to Greg's posting.
Tilman
===== syslog ======
sbrsa_write; private struct =ffff880307620e00
{103936.132220] usbrsa ttyUSB0: usbrsa_write - port 0; bytes=11 := count=11
: nofTxBytesFree=4085
[103936.132226] usbrsa ttyUSB0: usbrsa_write - poolsize 10, urb_index 0
[103936.132231] usbrsa ttyUSB0: usbrsa_write - port 0;URB allocated=0
[103936.132237] usbrsa ttyUSB0: usbrsa_write - port 0;bytes in urb=11
[103936.132245] usbrsa ttyUSB0: usbrsa_write - length = 11, data = 30 31 32
33 34 35 36 37 38 39 0a
[103936.132255] usbrsa ttyUSB0: usbrsa_write - port 0;sent=11;count=0;
nof_bytes_to_be_sent=0;bytes=11
[103936.132261] usbrsa ttyUSB0: usbrsa_write() End - sent=11
[103936.132306] usbrsa ttyUSB0: usbrsa_write_callback() - port = 0, ep
=0xc0018f80
[103936.132319] usbrsa ttyUSB0: usbrsa_write_callback - length = 11, data =
30 31 32 33 34 35 36 37 38 39 0a
[103936.132326] usbrsa ttyUSB0: usbrsa_write_callback(): Returned URB 0
sbrsa_status_callback: nofTxBytesFree=4074,nofRxBytesReceived=0
[103938.129140] usbrsa ttyUSB0: usbrsa_status_callback():
usb_serial_port_softint
......
[103966.130101] usbrsa ttyUSB0: usbrsa_status_callback():
usb_serial_port_softint
[103966.654158] usbrsa_close - start
[103966.654167] usbrsa ttyUSB0: usbrsa_close - port 0 start
[103966.654172] usbrsa ttyUSB0: send_baudrate_lcr_register()
.....
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