On Sun, May 15, 2011 at 6:08 PM, Andrew Errington <[email protected]> wrote: > On Sun, 15 May 2011 14:20:16 Nick Rout wrote: >> On Sun, May 15, 2011 at 2:45 PM, Steve Holdoway <[email protected]> > wrote: >> > http://www.newit.co.uk/forum/index.php?topic=1810.0 any use?? >> >> Certainly worth bookmarking for the future, but you can't get the >> serial console without the proprietary jtag connector. >> >> However I wonder if I can jimmy one up. The device has two ports that >> plug into the jtag box. One is a 'uart' connector, the other is >> specifically for jtag. The proprietary box seems to serve two >> purposes, a proper jtag connector AND a gateway between the uart port >> on the device and a ftdi serial usb chip. So... I guess someone with >> knowledge of the pinouts on the 4 pin uart connector, and some >> electronics nous could try and get the serial part going... > > Hi Nick, > > The adapter kit is US$39. It's hardly expensive.
Plus $38.05US shipping via fedex, and whats more globalscale seem to take forever to actually ship, from my looking around on the net. > > This wiki indicates the order of the 4 pins in the serial connector (at the > bottom of the page): > > http://www.plugcomputer.org/plugwiki/index.php/GuruPlug > Thanks for the link, i found the same info elsewhere, good to have two sources though. > If you only need the serial interface Now I have twigged that the serial and jtag funtionalities are different, and that the globalscale box just happens to supply both, I am working towards a serial/usb connection. >(not the JTAG) then you could probably > hack a USB->RS232 converter. I am looking at using this method: http://buffalo.nas-central.org/index.php/Use_a_Nokia_Serial_Cable_on_an_ARM9_Linkstation to get a serial connection. The uart pinouts are 3.3v level, not true serial, so this should work (again it was referenced in some guruplug forum.) I just bought a nokia cable on trademe, and am looking forward to some hacking. Now I just need the connector, 4 pin Molex PicoBlade™ 51021 Series connectors (1.25mm pitch). > Inside the converter (an FTDI one would be > best) is a USB UART chip and a level shifter. The UART deals with the USB > interface and the RS232 protocol. There are three key wires between this > chip and the level shifter: Data In, Data Out, and Ground. The level shifter > simply converts the 5V or 3.3V from the USB UART into +/- 12V or so needed by > a true RS232 device. > > If you buy a converter you need to peel off or crack open the case and > identify the two chips. Find out if the level converter is running at 3.3V > or 5V, and the model number of the FTDI chip (the USB UART). > > If the level converter is running at 3.3V then you can hook up two wires > directly from the Data In and Data Out pins on the FTDI. You also need a > Ground wire. Run these to the serial connector on the GuruPlug. (You don't > need the 3.3V wire). > > If the level converter is running at 5V then remove it and discard it. Find > out which pin on the FTDI chip sets the output to 3.3V and change it, then > hook up Data In, Data Out and Ground as above. > > Assuming you don't need another level of inversion this should give you a > console interface on /dev/ttyUSB0 > That's all good info, hopefully the nokia thingy will avoid needing to do all that, providing I can find the connector (as above). _______________________________________________ Linux-users mailing list [email protected] http://lists.canterbury.ac.nz/mailman/listinfo/linux-users
