From 75b81e47e350d88dcbfa0d60ae482aa2890a3797 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Thu, 13 Mar 2014 19:33:09 +0000
Subject: added one button to the simple midi controller

git-svn-id: https://svn.spreadspace.org/avr/trunk@252 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 usb-midi/usb-midi.c | 82 +++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 61 insertions(+), 21 deletions(-)

(limited to 'usb-midi/usb-midi.c')

diff --git a/usb-midi/usb-midi.c b/usb-midi/usb-midi.c
index 47e06fa..c305462 100644
--- a/usb-midi/usb-midi.c
+++ b/usb-midi/usb-midi.c
@@ -37,6 +37,7 @@
 #include <LUFA/Version.h>
 #include <LUFA/Drivers/USB/USB.h>
 #include "lufa-descriptor-midi.h"
+#include "LUFA/Drivers/Peripheral/Serial.h"
 
 /** LUFA MIDI Class driver interface configuration and state information. This structure is
  *  passed to all MIDI Class driver functions, so that multiple instances of the same class
@@ -77,6 +78,21 @@ void EVENT_USB_Device_ControlRequest(void)
 #include "util.h"
 #include "led.h"
 
+static FILE serial_stream;
+
+#define KEY_PIN PINF
+#define KEY_PORT PORTF
+#define KEY_DDR DDRF
+#define KEY_BIT 0
+
+#define KEY_LP_MAX 255
+
+void key_init(void)
+{
+  KEY_DDR = KEY_DDR & ~(1<<KEY_BIT);
+  KEY_PORT |= (1<<KEY_BIT);
+}
+
 int main(void)
 {
   MCUSR &= ~(1 << WDRF);
@@ -84,33 +100,57 @@ int main(void)
 
   cpu_init();
   led_init();
+  key_init();
+
+  Serial_Init(38400, 0);
+  Serial_CreateStream(&serial_stream);
+  stdin = stdout = stderr = &serial_stream;
+
   USB_Init();
   sei();
 
-  uint8_t MIDICommand = MIDI_COMMAND_NOTE_ON;
+  MIDI_EventPacket_t MIDIEventOn = (MIDI_EventPacket_t)
+    {
+      .CableNumber = 0,
+      .Command     = (MIDI_COMMAND_NOTE_ON >> 4),
+      .Data1       = MIDI_COMMAND_NOTE_ON | 0,
+      .Data2       = 0,
+      .Data3       = 0x7F,
+    };
+  MIDI_EventPacket_t MIDIEventOff = (MIDI_EventPacket_t)
+    {
+      .CableNumber = 0,
+      .Command     = (MIDI_COMMAND_NOTE_OFF >> 4),
+      .Data1       = MIDI_COMMAND_NOTE_OFF | 0,
+      .Data2       = 0,
+      .Data3       = 0,
+    };
+
+  static uint8_t last_state = (1<<KEY_BIT);
+  static uint8_t lp_cnt = 0;
   for(;;) {
 
     MIDI_EventPacket_t ReceivedMIDIEvent;
-    while(MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent)) { }
-
-
-    _delay_ms(1000);
-
-    led_on();
-    MIDICommand = (MIDICommand!=MIDI_COMMAND_NOTE_ON) ? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF;
-    MIDI_EventPacket_t MIDIEvent = (MIDI_EventPacket_t)
-      {
-        .CableNumber = 0,
-        .Command     = (MIDICommand >> 4),
-
-        .Data1       = MIDICommand | 1,
-        .Data2       = 0,
-        .Data3       = 0,
-      };
-    MIDI_Device_SendEventPacket(&Keyboard_MIDI_Interface, &MIDIEvent);
-    MIDI_Device_Flush(&Keyboard_MIDI_Interface);
-
-    led_off();
+    while(MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent)) {
+      led_on();
+      printf("%02X %02X %02X\r\n", ReceivedMIDIEvent.Data1, ReceivedMIDIEvent.Data2, ReceivedMIDIEvent.Data3);
+      led_off();
+    }
+
+    uint8_t state = KEY_PIN & (1<<KEY_BIT);
+    if(state != last_state)
+      lp_cnt++;
+    else
+      lp_cnt += lp_cnt ? -1 : 0;
+
+    if(lp_cnt >= KEY_LP_MAX) {
+      MIDI_EventPacket_t* MIDIEvent = state ? &MIDIEventOff : &MIDIEventOn;
+      MIDI_Device_SendEventPacket(&Keyboard_MIDI_Interface, MIDIEvent);
+      MIDI_Device_Flush(&Keyboard_MIDI_Interface);
+
+      last_state = state;
+      lp_cnt = 0;
+    }
 
     MIDI_Device_USBTask(&Keyboard_MIDI_Interface);
     USB_USBTask();
-- 
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