On 15/05/11 19:02, Nick Rout wrote: > 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). >
A couple of possible solutions for you http://nicegear.co.nz/electronics-gear/sparkfun-ftdi-breakout-33v/ http://nicegear.co.nz/electronics-gear/rs232-shifter-smd/ Or I could make one based on this hack http://www.marlwifi.org.nz/projects/xh8287-hack Col _______________________________________________ Linux-users mailing list [email protected] http://lists.canterbury.ac.nz/mailman/listinfo/linux-users
