[Thumbgps-devel] Build vs. modify vs. what should we be doing anyway?

Chris Kuethe chris.kuethe at gmail.com
Mon Mar 12 19:53:30 PDT 2012

On Mon, Mar 12, 2012 at 19:40, Dave Taht <dave.taht at gmail.com> wrote:
> On Mon, Mar 12, 2012 at 7:13 PM, Eric S. Raymond <esr at thyrsus.com> wrote:
>> Chris Kuethe <chris.kuethe at gmail.com>:
>>> ublox antaris4 (and probably everything newer) has on-die usb and
>>> implements the abstract modem class. but 1PPS isn't transmitted over
>>> usb.
>> Annoyingly, it probably could be.  That modem model pretty much has to have
>> DCD and RI events.

Well, serial is great for implementing in small/uncomplicated/cheap
hardware... I guess if you're TSMC or Atmel you can cram in a hardware
controller. And Atmel did joint work with ublox to produce the

As for tiny USB stacks, at least LUFA and V-USB come to mind.  I think
you can fit a software implementation into 4K.

I don't know of any I2C/SPI GPS. If you can point me at some good ones
I'd appreciate it, because I was thinking I'd have to build some glue
logic to do that for another project of mine.

AT90USB162 are $3.71 for single pieces from digikey. Or about $20 if
you want a nicely fabricated board like the "teensy".

> Perhaps simply a real usb microcontroller with spi or i2c then driving
> usb-2.0 for real...
> http://www.linux-usb.org/ezusb/ - 16 bucks and WAY too  many pins...
> but it should be possible to do much better than that after looking
> harder.
> I've also always got a kick out of the propeller chip...
> http://www.parallax.com/Store/Microcontrollers/PropellerChips/tabid/142/CategoryID/18/List/0/Level/a/ProductID/411/Default.aspx?SortField=ProductName%2cProductName
> Atmel's AVRs are also of interest...
> http://www.olimex.com/dev/avr-usb-162.html
> http://www.atmel.com/devices/at90usb162.aspx
>> --
>>                <a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
> --
> Dave Täht
> SKYPE: davetaht
> US Tel: 1-239-829-5608
> http://www.bufferbloat.net

GDB has a 'break' feature; why doesn't it have 'fix' too?

More information about the Thumbgps-devel mailing list