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  • Author Author: pchan
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Raspberry Pi 3 Model B GPIO 40 Pin Block Pinout

Graphic showing the GPIO pin breakout on the Raspberry Pi 3 Model B.

 

If you're looking for the new Raspberry Pi 3 Model B+ then you can find that here: Raspberry Pi 3 Model B+ GPIO 40 Pin Block & PoE Header Pinout

                                                                                                             
NEW! Raspberry Pi 3 Model B
Frequently Asked Questions Comparison Chart Technical Specifications
Unboxing Video Pi3 Video Arcade Project
pchan
  • in reply to rew

    Seeing some odd behaviour as a result of the UART changes : ( According to this thread https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=138162

    the UART peripheral is clocked from a changing clock! - the core clock. And even when not throttling due to temperature, there seems to be an odd baud rate.

    I could not use the UART except at 72000bps (and even then it would fail regularly). So an important way of connecting to the Pi 3 is broken currently. Quite concerning, since

    this is a fallback method, UART needs to be rock solid.

     

    Also, there seems to be something odd with the 802.11 settings. I've use settings which normally are quite standard, they work on other platforms like the BeagleBone Black.

    If I try to SSH to the Pi from the LAN using wireless, it works fine - for a short while! and then the Pi becomes unpingable and SSH stops functioning too. To recover I have to use a

    USB keyboard and ping out from the Pi. Then the wireless becomes alive again.

     

    The interesting thing is, if I plug in a Wi-Pi USB-wireless adapter, then both the RPI 3 on-board 802.11, and the Wi-Pi adapter function well, and do not go into this unresponsive state.

    As soon as I disconnect the Wi-Pi adapter, the issue reappears.

     

    This is my configuration:

    wpa_supplicant.conf file:

    ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev

    update_config=1

    network={

            ssid="my-ssid"

            scan_ssid=1

            psk="my-psk"

            proto=RSN

            key_mgmt=WPA-PSK

            pairwise=CCMP

            auth_alg=OPEN

    }

     

    And /etc/network/interfaces:

    source-directory /etc/network/interfaces.d

     

    auto lo

    iface lo inet loopback

     

    iface eth0 inet manual

     

    allow-hotplug wlan0

    iface wlan0 inet manual

        wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

    iface default inet dhcp

     

    allow-hotplug wlan1

    iface wlan1 inet manual

        wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

     

    I've noticed some old Pi threads suggest 'wireless-power off' should be added to the /etc/network/interfaces file, but that didn't work for me - and caused an error parsing the file when issuing

    'ifdown' commands for instance, with a 'misplaced option' error reported.

  • in reply to gwideman

    For anyone wanting a copy of this older PDF http://www.farnell.com/datasheets/1835725.pdf

    was released 06 February 2012. Thanks for pointing this out

    Cheers,

    Clem

  • in reply to Robert Peter Oakes

       In case you didn't know, there's a PDF doc called "BCM2835-ARM-Peripherals" available from several places (google). Page 89 has a block diagram showing functionally how the I/Os are arranged in a bit more detail.

    image

  • in reply to clem57

    Do you have a diagram that shows how the interrupt / edge change detection is added in ??