[Please don't cross-post - I've followed up just to darwin-dev since
this isn't really a USB issue.]
What driver are you using for this device? The serial family will
pass along this info if the driver is tracking it and presenting it.
It is up to the driver (and device) to support the flow control
lines, and I know several don't bother.
Cheers,
- Dean
On Feb 11, 2006, at 3:12 PM, Mark Gilbert wrote:
Folks.
I have a special USB serial adaptor using the FTDI RS232 chip. The
device has a sensor attached to the CTS line of the chip, and I
need to be able to sense the status of the CTS line from my app.
Ideally I would be able to setup a blocking call to only return
when the status changes.
I use Posix to open and configure the port, then I have tried
ioctl using TIOCMGET to read the CTS status, but TIOCMGET always
returns the same thing (102 decimal) regardless of the value on the
CTS line. This denotes CTS is high. Another developer using the
same box on Windows is able to read the CTS no problem, so I know
the device is OK.
Also, I see that in Linux there is a call TIOCMIWAIT which appears
to do the blocking sense, but I can't find this in any Mac headers.
This would be desirable but not essential.
Could anyone suggest anything else to try ? I am not having any
luck with the TIOCMGET which should be working according to the
Apple docs I have found ('WorkingwithSerial.pdf')
Any suggestions would be welcomed.
Thanks
Mark Gilbert
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