Demos/Device/LowLevel/MIDI/MIDI.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Main source file for the MIDI input demo. This file contains the main tasks of the demo and
  34  *  is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "MIDI.h"
  38
  39 /** Main program entry point. This routine configures the hardware required by the application, then
  40  *  enters a loop to run the application tasks in sequence.
  41  */
  42 int main(void)
  43 {
  44         SetupHardware();
  45
  46         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  47         sei();
  48
  49         for (;;)
  50         {
  51                 MIDI_Task();
  52                 USB_USBTask();
  53         }
  54 }
  55
  56 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  57 void SetupHardware(void)
  58 {
  59         /* Disable watchdog if enabled by bootloader/fuses */
  60         MCUSR &= ~(1 << WDRF);
  61         wdt_disable();
  62
  63         /* Disable clock division */
  64         clock_prescale_set(clock_div_1);
  65
  66         /* Hardware Initialization */
  67         Joystick_Init();
  68         LEDs_Init();
  69         Buttons_Init();
  70         USB_Init();
  71 }
  72
  73 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
  74 void EVENT_USB_Device_Connect(void)
  75 {
  76         /* Indicate USB enumerating */
  77         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  78 }
  79
  80 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
  81  *  the status LEDs, disables the sample update and PWM output timers and stops the USB and MIDI management tasks.
  82  */
  83 void EVENT_USB_Device_Disconnect(void)
  84 {
  85         /* Indicate USB not ready */
  86         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  87 }
  88
  89 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
  90  *  of the USB device after enumeration - the device endpoints are configured and the MIDI management task started.
  91  */
  92 void EVENT_USB_Device_ConfigurationChanged(void)
  93 {
  94         /* Indicate USB connected and ready */
  95         LEDs_SetAllLEDs(LEDMASK_USB_READY);
  96
  97         /* Setup MIDI stream endpoints */
  98         if (!(Endpoint_ConfigureEndpoint(MIDI_STREAM_OUT_EPNUM, EP_TYPE_BULK,
  99                                              ENDPOINT_DIR_OUT, MIDI_STREAM_EPSIZE,
 100                                          ENDPOINT_BANK_SINGLE)))
 101         {
 102                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 103         }
 104
 105         if (!(Endpoint_ConfigureEndpoint(MIDI_STREAM_IN_EPNUM, EP_TYPE_BULK,
 106                                              ENDPOINT_DIR_IN, MIDI_STREAM_EPSIZE,
 107                                          ENDPOINT_BANK_SINGLE)))
 108         {
 109                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 110         }
 111 }
 112
 113 /** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
 114  *  to the host.
 115  */
 116 void MIDI_Task(void)
 117 {
 118         static uint8_t PrevJoystickStatus;
 119
 120         /* Device must be connected and configured for the task to run */
 121         if (USB_DeviceState != DEVICE_STATE_Configured)
 122           return;
 123
 124         Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPNUM);
 125
 126         if (Endpoint_IsINReady())
 127         {
 128                 uint8_t MIDICommand = 0;
 129                 uint8_t MIDIPitch;
 130
 131                 uint8_t JoystickStatus  = Joystick_GetStatus();
 132                 uint8_t JoystickChanges = (JoystickStatus ^ PrevJoystickStatus);
 133
 134                 /* Get board button status - if pressed use channel 10 (percussion), otherwise use channel 1 */
 135                 uint8_t Channel = ((Buttons_GetStatus() & BUTTONS_BUTTON1) ? MIDI_CHANNEL(10) : MIDI_CHANNEL(1));
 136
 137                 if (JoystickChanges & JOY_LEFT)
 138                 {
 139                         MIDICommand = ((JoystickStatus & JOY_LEFT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 140                         MIDIPitch   = 0x3C;
 141                 }
 142
 143                 if (JoystickChanges & JOY_UP)
 144                 {
 145                         MIDICommand = ((JoystickStatus & JOY_UP)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 146                         MIDIPitch   = 0x3D;
 147                 }
 148
 149                 if (JoystickChanges & JOY_RIGHT)
 150                 {
 151                         MIDICommand = ((JoystickStatus & JOY_RIGHT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 152                         MIDIPitch   = 0x3E;
 153                 }
 154
 155                 if (JoystickChanges & JOY_DOWN)
 156                 {
 157                         MIDICommand = ((JoystickStatus & JOY_DOWN)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 158                         MIDIPitch   = 0x3F;
 159                 }
 160
 161                 if (JoystickChanges & JOY_PRESS)
 162                 {
 163                         MIDICommand = ((JoystickStatus & JOY_PRESS)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 164                         MIDIPitch   = 0x3B;
 165                 }
 166
 167                 /* Check if a MIDI command is to be sent */
 168                 if (MIDICommand)
 169                 {
 170                         USB_MIDI_EventPacket_t MIDIEvent = (USB_MIDI_EventPacket_t)
 171                                 {
 172                                         .CableNumber = 0,
 173                                         .Command     = (MIDICommand >> 4),
 174
 175                                         .Data1       = MIDICommand | Channel,
 176                                         .Data2       = MIDIPitch,
 177                                         .Data3       = MIDI_STANDARD_VELOCITY,
 178                                 };
 179
 180                         /* Write the MIDI event packet to the endpoint */
 181                         Endpoint_Write_Stream_LE(&MIDIEvent, sizeof(MIDIEvent));
 182
 183                         /* Send the data in the endpoint to the host */
 184                         Endpoint_ClearIN();
 185                 }
 186
 187                 /* Save previous joystick value for next joystick change detection */
 188                 PrevJoystickStatus = JoystickStatus;
 189         }
 190
 191         /* Select the MIDI OUT stream */
 192         Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPNUM);
 193
 194         /* Check if a MIDI command has been received */
 195         if (Endpoint_IsOUTReceived())
 196         {
 197                 USB_MIDI_EventPacket_t MIDIEvent;
 198
 199                 /* Read the MIDI event packet from the endpoint */
 200                 Endpoint_Read_Stream_LE(&MIDIEvent, sizeof(MIDIEvent));
 201
 202                 /* Check to see if the sent command is a note on message with a non-zero velocity */
 203                 if ((MIDIEvent.Command == (MIDI_COMMAND_NOTE_ON >> 4)) && (MIDIEvent.Data3 > 0))
 204                 {
 205                         /* Change LEDs depending on the pitch of the sent note */
 206                         LEDs_SetAllLEDs(MIDIEvent.Data2 > 64 ? LEDS_LED1 : LEDS_LED2);
 207                 }
 208                 else
 209                 {
 210                         /* Turn off all LEDs in response to non Note On messages */
 211                         LEDs_SetAllLEDs(LEDS_NO_LEDS);
 212                 }
 213
 214                 /* Clear the endpoint ready for new packet */
 215                 Endpoint_ClearOUT();
 216         }
 217 }