rpi

Documentation

Overview

Package rpi contains Raspberry Pi hardware logic. It is intrinsically related to package bcm283x.

Assumes Raspbian but does not directly depend on the distro being Raspbian. Windows IoT is currently not supported.

Physical

The physical pin out is based on http://www.raspberrypi.org information but http://pinout.xyz/ has a nice interactive web page.

Index

• Variables
• func Present() bool

Variables

var (
	// Raspberry Pi A and B, 26 pin header:
	P1_1  pin.Pin    = pin.V3_3       // max 30mA
	P1_2  pin.Pin    = pin.V5         // (filtered)
	P1_3  gpio.PinIO = bcm283x.GPIO2  // High, I2C1_SDA
	P1_4  pin.Pin    = pin.V5         //
	P1_5  gpio.PinIO = bcm283x.GPIO3  // High, I2C1_SCL
	P1_6  pin.Pin    = pin.GROUND     //
	P1_7  gpio.PinIO = bcm283x.GPIO4  // High, GPCLK0
	P1_8  gpio.PinIO = bcm283x.GPIO14 // Low,  UART0_TXD, UART1_TXD
	P1_9  pin.Pin    = pin.GROUND     //
	P1_10 gpio.PinIO = bcm283x.GPIO15 // Low,  UART0_RXD, UART1_RXD
	P1_11 gpio.PinIO = bcm283x.GPIO17 // Low,  UART0_RTS, SPI1_CE1, UART1_RTS
	P1_12 gpio.PinIO = bcm283x.GPIO18 // Low,  PCM_CLK, SPI1_CE0, PWM0_OUT
	P1_13 gpio.PinIO = bcm283x.GPIO27 // Low,
	P1_14 pin.Pin    = pin.GROUND     //
	P1_15 gpio.PinIO = bcm283x.GPIO22 // Low,
	P1_16 gpio.PinIO = bcm283x.GPIO23 // Low,
	P1_17 pin.Pin    = pin.V3_3       //
	P1_18 gpio.PinIO = bcm283x.GPIO24 // Low,
	P1_19 gpio.PinIO = bcm283x.GPIO10 // Low, SPI0_MOSI
	P1_20 pin.Pin    = pin.GROUND     //
	P1_21 gpio.PinIO = bcm283x.GPIO9  // Low, SPI0_MISO
	P1_22 gpio.PinIO = bcm283x.GPIO25 // Low,
	P1_23 gpio.PinIO = bcm283x.GPIO11 // Low, SPI0_CLK
	P1_24 gpio.PinIO = bcm283x.GPIO8  // High, SPI0_CE0
	P1_25 pin.Pin    = pin.GROUND     //
	P1_26 gpio.PinIO = bcm283x.GPIO7  // High, SPI0_CE1

	// Raspberry Pi A+, B+, 2 and later, 40 pin header (also named J8):
	P1_27 gpio.PinIO = bcm283x.GPIO0  // High, I2C0_SDA used to probe for HAT EEPROM, see https://github.com/raspberrypi/hats
	P1_28 gpio.PinIO = bcm283x.GPIO1  // High, I2C0_SCL
	P1_29 gpio.PinIO = bcm283x.GPIO5  // High, GPCLK1
	P1_30 pin.Pin    = pin.GROUND     //
	P1_31 gpio.PinIO = bcm283x.GPIO6  // High, GPCLK2
	P1_32 gpio.PinIO = bcm283x.GPIO12 // Low,  PWM0_OUT
	P1_33 gpio.PinIO = bcm283x.GPIO13 // Low,  PWM1_OUT
	P1_34 pin.Pin    = pin.GROUND     //
	P1_35 gpio.PinIO = bcm283x.GPIO19 // Low,  PCM_FS, SPI1_MISO, PWM1_OUT
	P1_36 gpio.PinIO = bcm283x.GPIO16 // Low,  UART0_CTS, SPI1_CE2, UART1_CTS
	P1_37 gpio.PinIO = bcm283x.GPIO26 //
	P1_38 gpio.PinIO = bcm283x.GPIO20 // Low,  PCM_DIN, SPI1_MOSI, GPCLK0
	P1_39 pin.Pin    = pin.GROUND     //
	P1_40 gpio.PinIO = bcm283x.GPIO21 // Low,  PCM_DOUT, SPI1_CLK, GPCLK1

	// P5 header on Raspberry Pi A and B, PCB v2:
	P5_1 pin.Pin    = pin.V5
	P5_2 pin.Pin    = pin.V3_3
	P5_3 gpio.PinIO = bcm283x.GPIO28 // Float, I2C0_SDA, PCM_CLK
	P5_4 gpio.PinIO = bcm283x.GPIO29 // Float, I2C0_SCL, PCM_FS
	P5_5 gpio.PinIO = bcm283x.GPIO30 // Low,   PCM_DIN, UART0_CTS, UART1_CTS
	P5_6 gpio.PinIO = bcm283x.GPIO31 // Low,   PCM_DOUT, UART0_RTS, UART1_RTS
	P5_7 pin.Pin    = pin.GROUND
	P5_8 pin.Pin    = pin.GROUND

	AUDIO_RIGHT         = bcm283x.GPIO40 // Low,   PWM0_OUT, SPI2_MISO, UART1_TXD
	AUDIO_LEFT          = bcm283x.GPIO41 // Low,   PWM1_OUT, SPI2_MOSI, UART1_RXD
	HDMI_HOTPLUG_DETECT = bcm283x.GPIO46 // High,
)

Pin as connect on the 40 pins extension header.

Schematics are useful to know what is connected to what: https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/README.md

The actual pin mapping depends on the board revision! The default values are set as the 40 pins header on Raspberry Pi 2 and Raspberry Pi 3.

Some header info here: http://elinux.org/RPi_Low-level_peripherals

P1 is also known as J8 on A+, B+, 2 and later.

Functions

func Present

func Present() bool

Present returns true if running on a Raspberry Pi board.

https://www.raspberrypi.org/