Wu Jiang b02fcae87d Give rpi some time to link digital pin property ...

It looks like Raspberry pi needs some time to get a digital pin
link properly after it is being exported.

Sample code to run:

```go
package main

import (
        "fmt"

        "github.com/kidoman/embd"
         _ "github.com/kidoman/embd/host/rpi"
)

func main() {
        defer embd.CloseGPIO()
        fmt.Println(embd.SetDirection(10, embd.Out))
}

```

- before the change, the output is:
`open /sys/class/gpio/gpio10/direction: permission denied`

- after the change, the output is `<nil>`

Close #52

2016-01-21 15:42:27 -05:00

..

digitalpin_test.go

host specific drivers can now be loaded separately

2014-04-06 06:50:09 +05:30

digitalpin.go

Give rpi some time to link digital pin property

2016-01-21 15:42:27 -05:00

doc.go

host specific drivers can now be loaded separately

2014-04-06 06:50:09 +05:30

i2cbus.go

i2c: added debug logs

2014-04-10 07:38:14 +05:30

interrupt.go

gpio: consistent naming

2015-01-15 05:35:21 +05:30

led.go

host specific drivers can now be loaded separately

2014-04-06 06:50:09 +05:30

spibus.go

Fix typo

2015-12-22 12:54:33 -05:00