Simple Midiclock

midi_clock.go

package main

import (
	"fmt"
	"log"
	"os"
	"time"
)

const target_bmp = 121.00
const uspm = 6000000

func main() {
	midi_start := []byte{0xfa}
	//midi_stop := []byte{0xfc}
	midi_tick := []byte{0xf8}
	//midi_continue := []byte{0xfb}

	fmt.Println("Midi Clock test")
	m, err := os.OpenFile("/dev/snd/midiC1D0", os.O_WRONLY, 0664)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("Midi start")
	m.Write(midi_start)
	m.Sync()

	pulse_interval := bpmToPulseInterval(target_bmp)
	fmt.Printf("Calculated Interval:%v", pulse_interval)

	for {
		m.Write(midi_tick)
		time.Sleep(pulse_interval * time.Microsecond)
	}

}

func bpmToPulseInterval(bpm float64) time.Duration {
	return time.Duration((uspm / (bpm / 10)) / 24)
}