81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
// =============================================================================
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// Auth: alex
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// File: boot.go
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// Revn: 06-16-2026 2.0
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// Func: Blink a light when the pi boots (or on login, but who cares)
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//
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// TODO: create
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// =============================================================================
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// CHANGE LOG
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// -----------------------------------------------------------------------------
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// 06-23-2022: init
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//*10-10-2023: imported flag
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// added flag to define gpio pin at runtime
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//*06-16-2026: added flag to control flash duration
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// added flag to control amount of flashes
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// added flag to decide between flash mode and toggle mode
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//
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// =============================================================================
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package main
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import (
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"flag" // IntVar, BoolVar, Float64Var, Parse
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"fmt" // Println
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// rpio.Pin, Pin, Open, Close, Output, Toggle
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"github.com/stianeikeland/go-rpio"
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"os" // Exit
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"time" // Sleep, time.Second
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)
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/*
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Toggles a LED on physical pin 19 (mcu pin 10)
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Connect a LED with resistor from pin 19 to ground.
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*/
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var pin rpio.Pin // global pin object
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var num int // flag variable, holds pin number
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var dur float64 // flag variable, holds duration
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var amt int // flag variable, holds times to flash
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var tog bool // flag variable, hold toggle mode switch
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func main() {
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// map input flag to variable
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flag.IntVar( &num, "p", 10, "pin number" )
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flag.Float64Var( &dur, "d", 100, "duration of flash (ms)" )
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flag.IntVar( &amt, "n", 2, "amount of times to flash" )
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flag.BoolVar( &tog, "t", false, "toggle mode" )
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flag.Parse()
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// create pin object at given pin number
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pin = rpio.Pin( num )
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// Open and map memory to access gpio, check for errors
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if err := rpio.Open(); err != nil {
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fmt.Println( "Fatal: pin open failed" )
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fmt.Println( "Error: ", err.Error() )
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os.Exit(1)
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}
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// Unmap gpio memory when done
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defer rpio.Close()
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// Set pin to output mode
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pin.Output()
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if tog { // if user specifies toggle mode
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pin.Toggle() // toggle
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return // and leave
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}
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// Toggle pin 2*amt times
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for i := 0; i < 2 * amt; i++ {
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pin.Toggle()
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time.Sleep( time.Millisecond * time.Duration( dur ) )
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}
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}
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