On Tue, Mar 19, 2013 at 10:34 AM, Alan Ott <a...@signal11.us> wrote: > On 03/19/2013 10:24 AM, jonsm...@gmail.com wrote: >> I poked around with btusb a little. BT has it's own USB descriptor >> set. That's not the same as using a ft2232 to attach to the mc13224 >> UART. There is no way to do something btusb like on the ft2232. You >> could do it on the cc2531. > > A cc2531 is a programmable USB device, where firmware has direct access > to the USB hardware. With the firmware, one can do just about anything. > FTDI's on the other hand (at least our 2232), are not programmable, as > we know. > >> So the next question is, if a serial port is implementing a line >> disciple can you wire it inside the kernel to the networking stack so >> that every packet doesn't need to traverse user space. A similar >> question is why does PPP/SLIP need a user space daemon? > > Every packet _doesn't_ traverse userspace. The izattach daemon just sets > the line discipline of the device. (and I'm a little unclear on why it > needs to be a daemon).
Does the daemon need to hold the serial port open so that the line disciple doesn't reset? Maybe... Make a unique USB ID for the Econotag Modify the USB serial driver to see it The modified driver sets the line disciple and get the serial line tied into networking And no user space tty devices gets created? > > The packets, in the case of the Econotag, go from the air, to the > MC13224, out the serial line of the MC13224, into the FTDI, out of the > FTDI as USB, into the kernelspace FTDI driver as USB, out of the FTDI > driver and into the serial.c line driver as serial data, then into the > kernel 802.15.4 subsystem . No userspace required. > > http://linux-zigbee.git.sourceforge.net/git/gitweb.cgi?p=linux-zigbee/linux-zigbee;a=blob;f=src/serial.c;hb=HEAD > > Alan. > > > -- Jon Smirl jonsm...@gmail.com ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar _______________________________________________ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
