basic handling of midi events

1 files changed, 29 insertions, 2 deletions

diff --git a/pkg/controller/controller.go b/pkg/controller/controller.go
index b982c56..ab04fcc 100644
--- a/pkg/controller/controller.go
+++ b/pkg/controller/controller.go
@@ -25,16 +25,19 @@ package controller
 import (
 	"errors"
 	"fmt"
+	"log"
 	"strings"
 
 	"github.com/scgolang/midi"
 )
 
 const (
+	BUTTON_ON          = byte(0x90)
+	BUTTON_OFF         = byte(0x80)
 	NOTE_OFFSET_BUTTON = byte(0x00)
 	NUM_BUTTONS        = 4
 
-	CC_LED          = byte(0xB0)
+	LED_CC          = byte(0xB0)
 	NOTE_OFFSET_LED = byte(0x00)
 	NUM_LEDS        = 4
 	LED_OFF         = byte(0x00)
@@ -75,7 +78,31 @@ func NewController(c Config) (*Controller, error) {
 	return ctrl, nil
 }
 
+func (c *Controller) handleMidiPacket(p midi.Packet) {
+	num := p.Data[1]
+	switch p.Data[0] {
+	case BUTTON_ON:
+		log.Printf("controller: button %d pressed", num)
+	case BUTTON_OFF:
+		log.Printf("controller: button %d released", num)
+	default:
+		// ignore all other events
+		return
+	}
+}
+
 func (c *Controller) Init() error {
+	ch, err := c.Dev.Packets()
+	if err != nil {
+		return err
+	}
+
+	go func() {
+		for {
+			// TODO: handle Errors (reopen the device!)
+			c.handleMidiPacket(<-ch)
+		}
+	}()
 	return nil
 }
 
@@ -93,7 +120,7 @@ func (c *Controller) setLed(num byte, value byte) error {
 		return fmt.Errorf("this controller has only %d leds.", NUM_LEDS)
 	}
 
-	n, err := c.Dev.Write([]byte{CC_LED, NOTE_OFFSET_LED + num, value})
+	n, err := c.Dev.Write([]byte{LED_CC, NOTE_OFFSET_LED + num, value})
 	if err != nil {
 		// reopen device?
 		return err