mirror of
https://github.com/stianeikeland/go-rpio.git
synced 2025-01-23 02:31:05 +01:00
45 lines
933 B
Go
45 lines
933 B
Go
/*
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A PWM example by @youngkin, using the go-rpio library
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Fades a PWM hardware pin in and out using PWM mode balanced (vs. markspace)
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*/
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package main
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import (
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"os"
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"time"
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"github.com/stianeikeland/go-rpio/v4"
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)
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func main() {
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err := rpio.Open()
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if err != nil {
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os.Exit(1)
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}
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defer rpio.Close()
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pin := rpio.Pin(19)
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pin.Mode(rpio.Pwm)
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pin.Freq(64000)
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pin.DutyCycleWithPwmMode(0, 32, rpio.Balanced)
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// the LED will be blinking at 2000Hz
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// (source frequency divided by cycle length => 64000/32 = 2000)
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// five times smoothly fade in and out
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for i := 0; i < 5; i++ {
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for i := uint32(0); i < 32; i++ { // increasing brightness
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pin.DutyCycleWithPwmMode(i, 32, rpio.Balanced)
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time.Sleep(time.Second / 32)
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}
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for i := uint32(32); i > 0; i-- { // decreasing brightness
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pin.DutyCycleWithPwmMode(i, 32, rpio.Balanced)
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time.Sleep(time.Second / 32)
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}
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}
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pin.DutyCycleWithPwmMode(0, 32, rpio.Balanced)
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}
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