7 Replies Latest reply on Oct 1, 2012 8:45 PM by wallarug

    Raspberry Pi GIO pin out?


      Hi, the official web site has been down for a while. Does anyone know of the GIO pin out?

        • Re: Raspberry Pi GIO pin out?
          John Beetem

          www.raspberrypi.org is suspended, but the Wiki is alive and well: http://elinux.org/RaspberryPiBoard and http://elinux.org/Rpi_Hardware are good starting points.  The GPIO pinout is at http://elinux.org/Rpi_Low-level_peripherals.  I don't know if there's a live link to the GPIO data sheet at this time.


          The Wiki is immune from DDoS since so few people RTFM :-)

          • Re: Raspberry Pi GIO pin out?

            Johns right on the money, there was a lot of discussion in the (dead) fourm regarding this.

            Beware most the pins are direct to the SOC (Chip) so I would not recomend connecting directly to the GPIO header

            Google GERT board, being designed as an interface board. (At least use opto-couplers or buffer IC's)



            See http://www.geek.com/articles/chips/raspberry-pis-gertboard-expansion-board-already-works-video-2012019/



            • Re: Raspberry Pi GIO pin out?

              The data sheet for the Broadcomm 2835 chip used in the Rpi (including GPIO info) is hosted here on the Element 14 website in the "Technical Documents" section of the Raspberry Pi group.   If you're reading this posting on a discussion page, look for "Home>RaspberryPi", click on the RaspberryPi link to get to the group home page, then look for Documents link, then the bottom posting of "Technical Documents for the Raspbery Pi".  The GPIO info is around page 102-103 of the Broadcomm document.  Note that the numbering scheme for the GPIO signals in the Broadcomm data sheet is the GPIO numbers relative to the CHIP.  If you want to know where those CHIP numbers come out on the Raspberry Pi HEADER, you need to go to the Wiki that John mentions above.  


              However, note that several functions listed in the wiki diagrams with color shading (purple, yellow, blue) are in fact PARTICULAR "preferred" usages of SPECIFIC chip GPIO pins.   The green "GPIO 0" pin of the Wiki layout is in fact the GPIO 17 on the actual chip, and (for example) the yellow "TX" header pin is in fact the chip GPIO 14 that has been programmed for the UART function.  Any of the purple, yellow and blue "function" pins in the RPi header is in fact a GPIO pin all its own that can be programmed either for the function listed in the wiki (its "logical engineering use") or for some other function if you would rather use it that way.  Thus, there are a total of 17 GPIO pins from the Broadcomm chip that are brought out to the header, and they are not all in a consecutive numerical order.


              I am in the process of designing an expansion board and it has been somewhat confusing figuring out what the GPIO numbering situation is, because different people and sources have used different numbering systems, some of the early documentation and prototype boards were numbered and silkscreened wrong, and the Broadcomm peripherals datasheet that goes into the deepest level of detail on what the true situation is was only released a few weeks ago.   Good luck figuring it our for yourself!

              • Re: Raspberry Pi GIO pin out?

                on this page http://www.panu.it/raspberry/ you can find a GPIO pinout schematic with BMC connections.

                • Re: Raspberry Pi GIO pin out?

                  Here you go!


                  Also, Since when is the raspberrypi.org down?  DDOS attack - who would dare?