Archive for July, 2009
Jul 20 2009
A bit late, but here is the first beta of the Option HSDPA driver for FreeBSD 8. It’s more or less completely rewritten and there are some visible changes to the interface.
Because ucom(4) has matured it can now be utilized instead of mucking around directly with the TTY layer. This results in that the device names in /dev has changed and are now longer called /dev/HSO*, instead they follow the standard ucom names of cuaU*.
The new USB stack attach USB devices per USB interface instead of per USB device, so it’s possible to get both a cuaU0 and cuaU1 device (instead of just cuaU0.0 and cuaU0.1). The number of found serial ports can be read through sysctl.
The packet interface is now exposed as a raw interface instead of emulating an Ethernet device (I seriously wonder why I did that…).
The driver switches automatically from install-cd mode to modem mode, there is no longer any need for manual switching through devd. Please remove the option-icon.conf file from your /usr/local/etc/devd directory.
And last, I’ve renamed the driver to uhso to reflect its USB nature.
Download: uhso-20091122.tar.gz – Add support for iCON 505, fix probing of devices with dynamic number of interfaces, add new custom attach messages based on the port type.
Download: uhsoctl-beta-20090820.tar.gz – uhsoctl connection utility, similar to old hsoctl
Download: uhso-beta-20090812.tar.gz – Minor bug fix and reworked sysctl nodes.
Download: uhso-beta-20090723.tar.gz – No longer PTP interface (completely useless), fixed (hopefully) CDC notification on modem port, added several new device IDs. Thanks to Iain Hibbert for this!
Download: uhso-beta-20090722.tar.gz – Bug fixes that should improve RX speed.
If you own an Option device, please leave a comment (or send a mail) with its full name and USB device ID.
I’m particularly interested in the following devices iCON 031, iCON 210, iCON 315, iCON 322, iCON 401, iCON 431, iCON 451, iCON 452, iCON 505.
If you’re running FreeBSD 8 and own an Option device, please mail me the output of
usbconfig -u X -a Y dump_device_desc usbconfig -u X -a Y dump_all_config_desc
where X and Y (5 and 2 below) can be obtained through usbconfig
# usbconfig ... ugen5.2: <Globetrotter HSDPA Modem Option N.V.> at usbus5, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON
This driver has been tested with a Globesurfer iCON 7.2, iCON 255, iCON 505
Quick setup for manual connection
Look up the serial ports
# sysctl dev.uhso dev.uhso.0.netif: uhso0 dev.uhso.0.type: Network/Serial dev.uhso.0.ports: 2 dev.uhso.0.port.control.tty: cuaU0.0 dev.uhso.0.port.control.desc: Control dev.uhso.0.port.application.tty: cuaU0.1 dev.uhso.0.port.application.desc: Application ... dev.uhso.1.type: Serial dev.uhso.1.ports: 1 dev.uhso.1.port.diagnostic.tty: cuaU1 dev.uhso.1.port.diagnostic.desc: Diagnostic
Open /dev/cuaU0.0 in a terminal application, for example minicom. Issue the following commands to establish a connection.
AT+CPIN="1234" # Your PIN OK AT_OWANCALL=1,1,1 OK AT_OWANDATA=1 _OWANDATA: 1, 22.214.171.124, 0.0.0.0, 126.96.36.199, 188.8.131.52, 0.0.0.0, 0.0.0.0, 72000
If you haven’t configured a PDP context with your providers APN, please see the hso page.
Configure the interface and set a default route
# ifconfig uhso0 184.108.40.206 # route add default -interface uhso0
1-wire: is a serial bus from Dallas Semiconductor/Maxim that only requires 1 data line, there are a number of cheap sensors and other devices for this bus. The strength of this bus is not its speed but that it supports large ranges (up to 300 meters).
IPv6: Insanely large address space. It’s common to use a 64-bit netmask for site networks so that EUI-64 based addresses can be used for auto configuration. This leaves 64-bit for the node address – do you see where this is going now… :)
Yes..I’ve built a device that assigned each 1-wire device it’s connected to its own IPv6 address. Why? you ask, mostly because I can.
As mentioned above, the device is based on an AVR ATmega644. It has 64KB of flash memory for program code and 4KB of RAM. It’s running on its built-in oscillator at 8MHz. The ENC28J60 Ethernet chip is connected to the AVR using SPI. The rest of the hardware is mostly for power distribution and management.
The PCB was manufactured by BatchPCB, cheap service but a bit slow turn-around time.
Unfortunately I screwed up the SPI connection but I managed to fix that with some green wires (or black wires in this case). You’ll note them in the picture above.
As for the 1-wire devices I had implemented a bus master in software that generated the require waveforms. It worked great up to about 10-15 meters. Any cable length greater than that refused to work.
This required an add-on board and because I didn’t want to wait for a new PCB I used a 2.54mm prototype board. With the DS2480 only available in SOIC8 packages it required some “creative” soldering :).
The add-on board is extremely ugly. But hey, it works.
Future improvements for the next revision
I’ll publish the PCB CAD files when the next revision is complete.
The only small IPv6 stack I know of is the uIPv6 stack in the Contiki operating system created by Adam Dunkel et al. This is unfortunately only available together with Contiki and not as a stand alone package as the originally uIP (IPv4) stack.
Contiki is a great operating system, but when you only have 4KB of RAM it becomes a bit heavy weight. So I broke out the uIPv6 stack from Contiki and made it run stand alone and ported in to AVR. I also ported the web server application from Contiki and made it run on AVR. As I wanted to use multiple IPv6 addresses I also had to add support for IP aliases to the uIPv6 stack.
Since the uIPv6 was integrated with Contiki it used the Contiki process model which it self is based on “proto-threads” (another thing invented by Adam Dunkel). I felt that this didn’t fit so I turned all processes into a polling mode instead. So one has to call a set of polling functions from the main application loop or from timers.
The other major parts of the code are drivers for ENC28J60, DS2480 and DS1820.
Currently, with 5 1-wire devices connected it uses about 3KB of RAM.
I only have temperature sensors connected at the moment. If you happen to have an IPv6 capable connection you can access the sensors through a web browser.
(If you don’t have IPv6 you should get it, or you can view graphs based on the sensor values at lindberg.tl instead).
Do you have a bunch of useless USB-to-PS/2 keyboard adapters laying around? Two of them make a great female-female USB adapter – If you need one that is. Here is how I made one.
Carefully crack the case open using a knife. You can be quite rough at the PS/2 end of the casing as this part will be
Once opened you should basically have a USB-connector connected to a PS/2 connector covered in hot glue/plastic wrapped in a thin-foil like material (for shielding). Remove the wrapping and cut away the PS/2 connector with a knife.
Now, carefully remove the remaining plastic. Don’t worry about the soldered wires but make sure that you don’t damage the pins on the USB connector. You should end up with something like this.
Do the same with another USB-PS/2 adapter so that you basically end up with two USB connectors.
Place the connectors back-to-back and turn one of them 180 degrees so that it becomes “up-side-down”. If you don’t do this you’ll end up connecting the pins in the wrong way.
Cut out a piece of wire and solder it to the casing off each connector. You can use the existing solder points used for the shielding/ground or create a new. Some flux will help a lot here.
That’s it for the connector. Next up is to creating a new casing using the existing casings. Unfortunately I forgot to take pictures of this process.
Will it be as good as a commercial adapter? probably not. Will it effect data transmission? probably (depending on how good the solder joints are). Cheaper than a commercial adapter? yep (assuming you already have the parts needed and don’t factor in the labor :))