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Raspberry Pi GPIO Expansion - Low LevelPeripheralsErstellt am: 08.03.2012 10:29 von Ankur Tomar - Letzte Änderung: 08.03.2012 11:14 von Ankur Tomar

VERSION 4

Introduction

The Raspberry Pi allows peripherals and expansion boards to access the CPU by exposing the in and outputs. Theproduction board has a 26-pin 2.54mm (100mil) expansion header, arranged in a 2x13 strip. They provide 8 GPIO pinsplus access to I2C, SPI, UART), as well as +3V3, +5V and GND supply lines. Pin one is column 0 on the bottom row.Voltage levels are 3v3. There is no over-voltage protection on the board - the intention is that people interested in seriousinterfacing will use an external board with buffers, level conversion and analog I/O rather than soldering directly onto themain board.

It is also possible to reconfigure some of the pins to provide a second I2C interface. Kernel boot messages go to theUART at 115200bps.

Header Pinout:

Top Row 5V0 DNC GND TXD RXD GPIO1 DNC GPIO4 GPIO5 DNC GPIO6 SPI_CE0_N SPI_CE1_N

Bottom Row 3V3 SDA0 SCL0 GPIO7 DNC GPIO0 GPIO2 GPIO3 DNC SPI_MOSI SPI_MISO SPI_SCLK DNC

Colour legend

+5V

+3.3V

Do not connect

UART

GPIO

SPI

I2C

Power Pins

Maximum permitted current draw from the 3v3 pin is 50mA.

Maximum permitted current draw from the 5v pin is the USB input current (usually 1A) minus any current draw from therest of the board.

Model A: 1000mA - 500mA -> max power draw: 500mAModel B: 1000mA - 700mA -> max power draw: 300mA

General Purpose Input/Output (GPIO)

General Purpose Input/Output (GPIO) is a generic pin on a chip whose behaviour (including whether it is an input or outputpin) can be controlled (programmed) through software. All the UART, SPI and I2C pins can be reconfigured as GPIO pins,to provide a total of 17 GPIO pins. Each of their functions is detailed in the Broadcom BCM2835 chipset datasheet.

The available alternative functions and their corresponding pins are detailed below. These numbers are in reference to thechipset documentation and may not match the numbers exposed in linux or detailed above. Only fully usable functions aredetailed, for some alternative functions not all the necessary pins are available for the functionality to be actually used. Allexposed pins can be used for GPIO

Top Row Pinout:

Header 2 4 6 8 10 12 14 16 18 20 22 24 26Chipset 14 15 18 23 24 25 8 7Function 5V0 DNC GND TXD RXD PWM DNC GPIO GPIO DNC GPIO SPI_CE0_N SPI_CE1_N

Bottom Row Pinout:

Header 1 3 5 7 9 11 13 15 17 19 21 23 25Chipset 0 1 4 17 21 22 10 9 11Function 3V3 SDA0 SCL0 GPIO DNC GPIO GPIO GPIO DNC SPI_MOSI SPI_MISO SPI_SCLK DNC

The complete list of chipset pins which are available are:

0, 1, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23, 24, 25

Pin 12 supports PWM.GPIO voltage level is 3V3 and are not 5V tolerant.Each GPIO can interrupt, high/low/rise/fall/change.

It is also possible to reconfigure some of the pins to provide an ARM JTAG interface. However ARM_TMS isn't availablefor this (chipset pin 12 or 27 is needed).

It is also possible to reconfigure some of the pins to provide an I2S (hardware mod may be required) or PCM interface.

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Raspberry Pi GPIO Expansion - Low Level Peripherals - element14 http://www.element14.com/community/docs/DOC-43484/l/raspberry-p...

1 von 2 14.06.2012 12:08

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Attributes

Room: Development Platforms and Kits

Product Category: MCU/MPU/DSC/DSP/FPGA Development Kits

Manufacturer: Raspberry Pi

Silicon Manufacturer: Raspberry Pi

Silicon Core Number: BCM2835

Core Architecture: ARM

Core Sub-Architecture: ARM11

MIPI CSI-2

The MIPI CSI-2 interface to a 15-way flat flex connector is Sony sub-LVDS.

DSI

The DSI interface to a 15-way flat flex connector.

CEC

HDMI-CEC (Consumer Electronics Control for HDMI) is supported by hardware but some driver work will be needed andcurrently isn't exposed into Linux userland.

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wocket 10.03.2012 11:14

I'm a little confused MIPI CSI-2 (Camera Serial Interface 2) is a camera interface standard and DSI interface isDisplay Serial Interface (A bit like ATM machine) but Low Voltage Differential Signaling refers to both LCD's andCamera's.

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Raspberry Pi GPIO Expansion - Low Level Peripherals - element14 http://www.element14.com/community/docs/DOC-43484/l/raspberry-p...

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