forked from shanghuiyang/rpi-devices
/
led.go
72 lines (62 loc) · 1.1 KB
/
led.go
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/*
Package dev ...
Connect to Pi:
- positive(the longer pin): any data pin
- negative(she shorter pin): any gnd pin
*/
package dev
import (
"time"
"github.com/stianeikeland/go-rpio"
)
const (
logTagLed = "led"
)
// Led ...
type Led struct {
pin rpio.Pin
}
// NewLed ...
func NewLed(pin uint8) *Led {
l := &Led{
pin: rpio.Pin(pin),
}
l.pin.Output()
return l
}
// On ...
func (l *Led) On() {
l.pin.High()
}
// Off ...
func (l *Led) Off() {
l.pin.Low()
}
// Blink is let led blink n time, interval Millisecond each time
func (l *Led) Blink(n int, interval int) {
d := time.Duration(interval) * time.Millisecond
for i := 0; i < n; i++ {
l.On()
time.Sleep(d)
l.Off()
time.Sleep(d)
}
}
// Fade ...
func (l *Led) Fade(n uint8) {
l.pin.Pwm()
l.pin.Freq(64000)
l.pin.DutyCycle(0, 32)
for i := uint8(0); i < n; i++ {
for j := uint32(0); j < 32; j++ { // increasing brightness
l.pin.DutyCycle(j, 32)
time.Sleep(time.Second / 32)
}
for j := uint32(32); j > 0; j-- { // decreasing brightness
l.pin.DutyCycle(j, 32)
time.Sleep(time.Second / 32)
}
}
l.pin.Output()
l.pin.Low()
}