On Sun, Oct 27, 2002 at 01:10:21PM -0500, Frederick Grim wrote:
> Howdy,
>
> I am not sure if the following problem is due to my
> misunderstanding but probably it does. I am trying to use the belkin
> usb to serial converter. But it does not seem to work. I have been
> using the following code
>
> void init_term_dev(int fd) {
>
> struct termios term;
>
> //Init the terminal device to
> //correct baud rate
>
> term.c_cflag = 0;
> term.c_cflag = CREAD | CS8 | B9600 | CRTSCTS;
> term.c_iflag = 0;
> term.c_oflag = 0;
> term.c_lflag = 0;
>
> tcflush(fd, TCIFLUSH);
>
> if(tcsetattr(fd, TCSANOW, &term) < 0)
> perror("problem setting ttyUSB0 attributes");
>
> }
>
> int main(int argc, char* argv[]) {
>
> int fd_p = open("/dev/ttyUSB0", O_RDWR, 0);
>
> char buf[10];
>
> init_term_dev(fd_p);
>
> write(fd_p, "/B 2", 5);
wrute(fd_p, "/B 2\n", 5);
>
> close(fd_p);
>
> return 0;
>
> }
>
> However even if this code reflects some fundamental misunderstanding of
> UNIX serial programming the command echo "Howdy" > /dev/ttyUSB0 does not work either.
>
> By does not work I mean I cannot read these characters off another
> serial port connected via null-modem cable. In the logs I get the
> following messages
>
> Oct 27 12:34:42 local kernel: usbserial.c: serial_open
> Oct 27 12:34:42 local kernel: belkin_sa.c: belkin_sa_open port 0
> Oct 27 12:34:42 local kernel: usbserial.c: serial_ioctl - port 0, cmd 0x540b
> Oct 27 12:34:42 local kernel: belkin_sa.c: belkin_sa_ioctl arg not supported - 0x540b
> Oct 27 12:34:42 local kernel: usbserial.c: serial_ioctl - port 0, cmd 0x5402
> Oct 27 12:34:42 local kernel: belkin_sa.c: belkin_sa_ioctl arg not supported - 0x5402
> Oct 27 12:34:42 local kernel: usbserial.c: serial_set_termios - port 0
> Oct 27 12:34:42 local kernel: usbserial.c: serial_ioctl - port 0, cmd 0x5401
> Oct 27 12:34:42 local kernel: belkin_sa.c: belkin_sa_ioctl arg not supported - 0x5401
> Oct 27 12:34:42 local kernel: usbserial.c: serial_write - port 0, 5 byte(s)
> Oct 27 12:34:42 local kernel: usbserial.c: generic_write - port 0
> Oct 27 12:34:42 local kernel: usbserial.c: generic_write - length = 5, data = 2f 42
>20 32 0d
> Oct 27 12:34:42 local kernel: usbserial.c: serial_close - port 0
> Oct 27 12:34:42 local kernel: belkin_sa.c: belkin_sa_close port 0
> Oct 27 12:34:42 local kernel: usbserial.c: generic_write_bulk_callback - port 0
> Oct 27 12:34:42 local kernel: usbserial.c: generic_write_bulk_callback - nonzero
>write bulk status received: -2
> Oct 27 12:34:42 local kernel: usbserial.c: generic_read_bulk_callback - port 0
> Oct 27 12:34:42 local kernel: usbserial.c: generic_read_bulk_callback - nonzero read
>bulk status received: -2
>
> After running the code above. So obviously one of my commands are
> incorrect and I am generating an -ENOENT error. However if I just echo
> a command to the device I get the same errors minus the cmd not
> supported part. So my question is obvious...What is wrong here?
>
> I am using the 2.4.18 kernel with debian woody. I appreciate the help
The problem exists in the 2.4.19 kernel with the 2.4.20-pre11 patch
applied
>
> Fred
>
>
> --
> Markets can remain irrational longer than you can remain solvent
> -John Maynard Keynes
>
> For a copy of my pgp public ket visit
> URL: http://norby.dyndns.org:8080
--
Markets can remain irrational longer than you can remain solvent
-John Maynard Keynes
For a copy of my pgp public ket visit
URL: http://norby.dyndns.org:8080
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