Hello,
On 08/24/2010 02:11 PM, Eloy Paris wrote:
[...]
> Well, this is getting a bit more puzzling... turns out that minicom uses
> select() too, and it works fine there:
[...]
Sorry being a pest, but I thought someone would eventually run into the
same problem I and at least another person ran into, so I thought I'd
post my findings here:
Turns out that the reason why things worked with minicom when talking to
the LinkUSB and not with digitemp or owfs is that I had minicom
configured for hardware flow control, and neither digitemp or owfs
enable hardware flow control when they open the serial port. As soon as
I disabled hardware flow control in minicom (as a test), select() timed
out just as it is timing out with both digitemp and owfs.
I tweaked things in owfs' module/owlib/src/c/ow_com.c as follows to see
if things got any better and it worked!
--- module/owlib/src/c/ow_com.c.orig 2010-08-24 15:35:13.177812544 -0400
+++ module/owlib/src/c/ow_com.c 2010-08-24 15:35:22.621699330 -0400
@@ -60,8 +60,8 @@
newSerialTio.c_iflag &= ~(BRKINT | ICRNL | IGNCR | INLCR | INPCK |
ISTRIP | IXON | IXOFF | PARMRK);
newSerialTio.c_iflag |= IGNBRK | IGNPAR;
newSerialTio.c_oflag &= ~(OPOST);
- newSerialTio.c_cflag &= ~(CRTSCTS | CSIZE | HUPCL | PARENB);
- newSerialTio.c_cflag |= (CLOCAL | CS8 | CREAD);
+ newSerialTio.c_cflag &= ~(CSIZE | HUPCL | PARENB);
+ newSerialTio.c_cflag |= (CRTSCTS | CLOCAL | CS8 | CREAD);
newSerialTio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL | ICANON |
IEXTEN | ISIG);
newSerialTio.c_cc[VMIN] = 0;
newSerialTio.c_cc[VTIME] = 3;
I have no idea who is being picky here (the LinkUSB, the FTDI USB to
serial converter, the Linux driver) but I guess that someone requires
the computer to assert the RTS line or something like that for things to
work properly.
I don't know how to best address this in a permanent way in the owfs
code. Would it make sense to at least make hardware flow control a
configurable option instead of hardcoding it to off like it is being
done today?
Hope this helps.
Cheers,
Eloy Paris.-
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