gpio

package

v0.0.0-...-3466a0e Latest Latest Go to latest Published: Jun 18, 2017 License: MIT Imports: 5 Imported by: 0

Details

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Repository

github.com/flyingyizi/go-wiringpi

Links

Open Source Insights

README ¶

get baoard info

the code refer https://github.com/AndrewFromMelbourne/raspberry_pi_revision and wiringPI archive

Prior to Raspberry Pi 2

that holds the revision number of the Raspberry Pi. Known revisions (prior to the Raspberry Pi 2) are:

| Revision |  Model  | PCB Rev | Memory | Manufacture |
|:--------:|:-------:|:-------:|:------:|:------------|
|   0000   |         |         |        |             |
|   0001   |         |         |        |             |
|   0002   |    B    |    1    | 256 MB |  EGOMAN     |
|   0003   |    B    |    1-1  | 256 MB |   EGOMAN    |
|   0004   |    B    |    1-2  | 256 MB |   Sony      |
|   0005   |    B    |    1-2  | 256 MB |   EGOMAN    |
|   0006   |    B    |    1-2  | 256 MB |   EGOMAN    |
|   0007   |    A    |    1-2  | 256 MB |   Egoman    |
|   0008   |    A    |    1-2  | 256 MB |   Sony      |
|   0009   |    A    |    1-2  | 256 MB |   Egoman    |
|   000d   |    B    |    1-2  | 512 MB |   Egoman    |
|   000e   |    B    |    1-2  | 512 MB |   Sony      |
|   000f   |    B    |    1-2  | 512 MB |   Egoman    |
|   0010   |    B+   |    1-2  | 512 MB |   Sony      |
|   0011   | compute |    1-1  | 512 MB |   Sony      |
|   0012   |    A+   |    1-1  | 256 MB |   Sony      |
|   0013   |    B+   |    1-2  | 512 MB |   Embest    |
|   0014   | compute |    1-1  | 512 MB |   Embest    |
|   0015   |    A+   |    1-1  | 256 MB |   Embest    |
|   0016   |    A+   |    1-1  | 256 MB |   Embest    |
|   0017   | compute |    1-1  | 512 MB |   sony      |
|   0018   | A+      |    1-1  | 256 MB |   sony      |
|   0019   |    B+   |    1-2  | 512 MB |   egoman    |
|   001a   | compute |    1-1  | 512 MB |   egoman    |
|   001b   | A+      |    1-1  | 256 MB |   egoman    |

If the Raspberry Pi has been over-volted (voiding the warranty) the revision number will have 100 at the front. e.g. 1000002.

Raspberry Pi 2 / Model Zero

With the release of the Raspberry Pi 2, there is a new encoding of the Revision field in /proc/cpuinfo. The bit fields are as follows

`FEDC`	`BA98`	`7654`	`3210`	`FEDC`	`BA98`	`7654`	`3210`
	`HG`	`FEEE`	`DDDD`	`CCCC`	`BBBB`	`BBBB`	`AAAA`
`1098`	`7654`	`3210`	`9876`	`5432`	`1098`	`7654`	`3210`

#	bits	contains	values
A	00-03	PCB Revision	(the pcb revision number)
B	04-11	Model name	A, B, A+, B+, B Pi2, Alpha, Compute Module, unknown, Pi3, Zero, Compute Module 3, unknown, Zero W
C	12-15	Processor	BCM2835, BCM2836, BCM2837
D	16-19	Manufacturer	Sony, Egoman, Embest, Sony Japan, Embest
E	20-22	Memory size	256 MB, 512 MB, 1024 MB
F	23-23	encoded flag	(if set, revision is a bit field)
G	24-24	waranty bit	(if set, warranty void - Pre Pi2)
H	25-25	waranty bit	(if set, warranty void - Post Pi2)

Also, due to some early issues the warranty bit has been move from bit 24 to bit 25 of the revision number (i.e. 0x2000000).

Peripheral Offsets for the Raspberry Pi

Peripheral	Offset	Address	Description	C Offset Macro
Base	0x00000000	0x20000000	Starting address	BCM2708_PERI_BASE
PADS_GPIO	0x00100000	0x20100000	PADS base	PADS_GPIO_BASE
GPIO 00..27	0x0010002C	0x2010002C	GPIO 00..27 pads	PADS_GPIO_00_27
GPIO 28..45	0x00100030	0x20100030	GPIO 28..45 pads	PADS_GPIO_28_45
GPIO 46..53	0x00100034	0x20100034	GPIO 46..53 pads	PADS_GPIO_46_53
Clock	0x00101000	0x20101000	Clock registers	ClkBase
GPIO	0x00200000	0x20200000	GPIO registers	GpioBase
GPPUD	0x00200025	0x20200025	Pull-up enable
GPPUDCLK0	0x00200026	0x20200026	Pull-up clock 0
GPPUDCLK1	0x00200027	0x20200027	Pull-up clock 1
PWM	0x0020C000	0x2020C000	PWM registers	PwmBase

Documentation ¶

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func Close ¶

func Close() (err error)

Close unmaps GPIO memory

func Open ¶

func Open() (err error)

Types ¶

type Direction ¶

type Direction uint

type Janitor ¶

type Janitor struct {
	// contains filtered or unexported fields
}

Janitor provides asynchronous notifications on input changes The user should supply it pins to watch with AddPin and then wait for changes

func NewJanitor ¶

func NewJanitor() *Janitor

NewJanitor creates a new Watcher instance for asynchronous inputs

func (*Janitor) AddPin ¶

func (w *Janitor) AddPin(pin Pin)

AddPin adds a new pin to be watched for changes The pin provided should be the pin known by the kernel

type Pin ¶

type Pin struct {
	// contains filtered or unexported fields
}

Pin represents a single pin, which can be used either for reading or writing

func (Pin) High ¶

func (p Pin) High() error

High sets the value of an output pin to logic high

func (Pin) Input ¶

func (pin Pin) Input()

Set pin as Input

func (Pin) Low ¶

func (p Pin) Low() error

Low sets the value of an output pin to logic low

func (Pin) Output ¶

func (pin Pin) Output()

Set pin as Output

func (Pin) Read ¶

func (pin Pin) Read() (value uint, err error)

func (Pin) TogglePin ¶

func (pin Pin) TogglePin()

Toggle a pin state (high -> low -> high)

type Pull ¶

type Pull uint8

const (
	PullOff Pull = iota
	PullDown
	PullUp
)

Pull Up / Down / Off

Source Files ¶

View all Source files

Directories ¶

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