rpi

Documentation

Overview

package rpi provides a GPIO implementation customised for the RPi.

Index

• Constants
• func GPIOFSel(pin, mode uint8)
• func OpenPin(number int, mode gpio.Mode) (gpio.Pin, error)

Constants

const (

	// Base Physical Address of the BCM 2835 peripheral registers
	BCM2835_PERI_BASE = 0x20000000

	// Base Physical Address of the System Timer registers
	BCM2835_ST_BASE = BCM2835_PERI_BASE + 0x3000

	// Base Physical Address of the Pads registers
	BCM2835_GPIO_PADS = BCM2835_PERI_BASE + 0x100000

	// Base Physical Address of the Clock/timer registers
	BCM2835_CLOCK_BASE = BCM2835_PERI_BASE + 0x101000

	// Base Physical Address of the GPIO registers
	BCM2835_GPIO_BASE = BCM2835_PERI_BASE + 0x200000

	// Base Physical Address of the SPI0 registers
	BCM2835_SPI0_BASE = BCM2835_PERI_BASE + 0x204000

	// Base Physical Address of the BSC0 registers
	BCM2835_BSC0_BASE = BCM2835_PERI_BASE + 0x205000

	// Base Physical Address of the PWM registers
	BCM2835_GPIO_PWM = BCM2835_PERI_BASE + 0x20C000

	// Base Physical Address of the BSC1 registers
	BCM2835_BSC1_BASE = BCM2835_PERI_BASE + 0x804000

	// Size of memory page on RPi
	BCM2835_PAGE_SIZE = 4 * 1024

	// Size of memory block on RPi
	BCM2835_BLOCK_SIZE = 4 * 1024

	BCM2835_GPFSEL0   = 0x0000 // GPIO Function Select 0
	BCM2835_GPFSEL1   = 0x0004 // GPIO Function Select 1
	BCM2835_GPFSEL2   = 0x0008 // GPIO Function Select 2
	BCM2835_GPFSEL3   = 0x000c // GPIO Function Select 3
	BCM2835_GPFSEL4   = 0x0010 // GPIO Function Select 4
	BCM2835_GPFSEL5   = 0x0014 // GPIO Function Select 5
	BCM2835_GPSET0    = 0x001c // GPIO Pin Output Set 0
	BCM2835_GPSET1    = 0x0020 // GPIO Pin Output Set 1
	BCM2835_GPCLR0    = 0x0028 // GPIO Pin Output Clear 0
	BCM2835_GPCLR1    = 0x002c // GPIO Pin Output Clear 1
	BCM2835_GPLEV0    = 0x0034 // GPIO Pin Level 0
	BCM2835_GPLEV1    = 0x0038 // GPIO Pin Level 1
	BCM2835_GPEDS0    = 0x0040 // GPIO Pin Event Detect Status 0
	BCM2835_GPEDS1    = 0x0044 // GPIO Pin Event Detect Status 1
	BCM2835_GPREN0    = 0x004c // GPIO Pin Rising Edge Detect Enable 0
	BCM2835_GPREN1    = 0x0050 // GPIO Pin Rising Edge Detect Enable 1
	BCM2835_GPFEN0    = 0x0048 // GPIO Pin Falling Edge Detect Enable 0
	BCM2835_GPFEN1    = 0x005c // GPIO Pin Falling Edge Detect Enable 1
	BCM2835_GPHEN0    = 0x0064 // GPIO Pin High Detect Enable 0
	BCM2835_GPHEN1    = 0x0068 // GPIO Pin High Detect Enable 1
	BCM2835_GPLEN0    = 0x0070 // GPIO Pin Low Detect Enable 0
	BCM2835_GPLEN1    = 0x0074 // GPIO Pin Low Detect Enable 1
	BCM2835_GPAREN0   = 0x007c // GPIO Pin Async. Rising Edge Detect 0
	BCM2835_GPAREN1   = 0x0080 // GPIO Pin Async. Rising Edge Detect 1
	BCM2835_GPAFEN0   = 0x0088 // GPIO Pin Async. Falling Edge Detect 0
	BCM2835_GPAFEN1   = 0x008c // GPIO Pin Async. Falling Edge Detect 1
	BCM2835_GPPUD     = 0x0094 // GPIO Pin Pull-up/down Enable
	BCM2835_GPPUDCLK0 = 0x0098 // GPIO Pin Pull-up/down Enable Clock 0
	BCM2835_GPPUDCLK1 = 0x009c // GPIO Pin Pull-up/down Enable Clock 1

	BCM2835_GPIO_FSEL_INPT        = 0x0 // Input
	BCM2835_GPIO_FSEL_OUTP        = 0x1 // Output
	BCM2835_GPIO_FSEL_ALT0        = 0x4 // Alternate function 0
	BCM2835_GPIO_FSEL_ALT1        = 0x5 // Alternate function 1
	BCM2835_GPIO_FSEL_ALT2        = 0x6 // Alternate function 2
	BCM2835_GPIO_FSEL_ALT3        = 0x7 // Alternate function 3
	BCM2835_GPIO_FSEL_ALT4        = 0x3 // Alternate function 4
	BCM2835_GPIO_FSEL_ALT5        = 0x2 // Alternate function 5
	BCM2835_GPIO_FSEL_MASK uint32 = 0x7

	GPIO_P1_12 = 18
	GPIO_P1_13 = 27
	GPIO_P1_15 = 22
	GPIO_P1_18 = 24
	GPIO_P1_22 = 25
	GPIO_P1_16 = 23
	GPIO_P1_11 = 17

	GPIO21 = GPIO_P1_13
	GPIO22 = GPIO_P1_15
	GPIO23 = GPIO_P1_16
	GPIO25 = GPIO_P1_22
	GPIO24 = GPIO_P1_18
	GPIO27 = GPIO_P1_13
	GPIO17 = GPIO_P1_11
)

Functions

func GPIOFSel

func GPIOFSel(pin, mode uint8)

func OpenPin

func OpenPin(number int, mode gpio.Mode) (gpio.Pin, error)

OpenPin returns a gpio.Pin implementation specalised for the RPi.