Demos/Device/LowLevel/MIDI/MIDI.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   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  *  starts the scheduler to run the application tasks.
  41  */
  42 int main(void)
  43 {
  44         SetupHardware();
  45
  46         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  47
  48         for (;;)
  49         {
  50                 MIDI_Task();
  51                 USB_USBTask();
  52         }
  53 }
  54
  55 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  56 void SetupHardware(void)
  57 {
  58         /* Disable watchdog if enabled by bootloader/fuses */
  59         MCUSR &= ~(1 << WDRF);
  60         wdt_disable();
  61
  62         /* Disable clock division */
  63         clock_prescale_set(clock_div_1);
  64
  65         /* Hardware Initialization */
  66         Joystick_Init();
  67         LEDs_Init();
  68         Buttons_Init();
  69         USB_Init();
  70 }
  71
  72 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
  73 void EVENT_USB_Device_Connect(void)
  74 {
  75         /* Indicate USB enumerating */
  76         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  77 }
  78
  79 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
  80  *  the status LEDs, disables the sample update and PWM output timers and stops the USB and MIDI management tasks.
  81  */
  82 void EVENT_USB_Device_Disconnect(void)
  83 {
  84         /* Indicate USB not ready */
  85         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  86 }
  87
  88 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
  89  *  of the USB device after enumeration - the device endpoints are configured and the MIDI management task started.
  90  */
  91 void EVENT_USB_Device_ConfigurationChanged(void)
  92 {
  93         /* Indicate USB connected and ready */
  94         LEDs_SetAllLEDs(LEDMASK_USB_READY);
  95
  96         /* Setup MIDI stream endpoints */
  97         if (!(Endpoint_ConfigureEndpoint(MIDI_STREAM_OUT_EPNUM, EP_TYPE_BULK,
  98                                              ENDPOINT_DIR_OUT, MIDI_STREAM_EPSIZE,
  99                                          ENDPOINT_BANK_SINGLE)))
 100         {
 101                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 102         }
 103
 104         if (!(Endpoint_ConfigureEndpoint(MIDI_STREAM_IN_EPNUM, EP_TYPE_BULK,
 105                                              ENDPOINT_DIR_IN, MIDI_STREAM_EPSIZE,
 106                                          ENDPOINT_BANK_SINGLE)))
 107         {
 108                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 109         }
 110 }
 111
 112 /** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
 113  *  to the host.
 114  */
 115 void MIDI_Task(void)
 116 {
 117         static uint8_t PrevJoystickStatus;
 118
 119         /* Device must be connected and configured for the task to run */
 120         if (USB_DeviceState != DEVICE_STATE_Configured)
 121           return;
 122
 123         Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPNUM);
 124
 125         if (Endpoint_IsINReady())
 126         {
 127                 uint8_t MIDICommand = 0;
 128                 uint8_t MIDIPitch;
 129
 130                 uint8_t JoystickStatus  = Joystick_GetStatus();
 131                 uint8_t JoystickChanges = (JoystickStatus ^ PrevJoystickStatus);
 132
 133                 /* Get board button status - if pressed use channel 10 (percussion), otherwise use channel 1 */
 134                 uint8_t Channel = ((Buttons_GetStatus() & BUTTONS_BUTTON1) ? MIDI_CHANNEL(10) : MIDI_CHANNEL(1));
 135
 136                 if (JoystickChanges & JOY_LEFT)
 137                 {
 138                         MIDICommand = ((JoystickStatus & JOY_LEFT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 139                         MIDIPitch   = 0x3C;
 140                 }
 141
 142                 if (JoystickChanges & JOY_UP)
 143                 {
 144                         MIDICommand = ((JoystickStatus & JOY_UP)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 145                         MIDIPitch   = 0x3D;
 146                 }
 147
 148                 if (JoystickChanges & JOY_RIGHT)
 149                 {
 150                         MIDICommand = ((JoystickStatus & JOY_RIGHT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 151                         MIDIPitch   = 0x3E;
 152                 }
 153
 154                 if (JoystickChanges & JOY_DOWN)
 155                 {
 156                         MIDICommand = ((JoystickStatus & JOY_DOWN)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 157                         MIDIPitch   = 0x3F;
 158                 }
 159
 160                 if (JoystickChanges & JOY_PRESS)
 161                 {
 162                         MIDICommand = ((JoystickStatus & JOY_PRESS)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 163                         MIDIPitch   = 0x3B;
 164                 }
 165
 166                 /* Check if a MIDI command is to be sent */
 167                 if (MIDICommand)
 168                 {
 169                         USB_MIDI_EventPacket_t MIDIEvent = (USB_MIDI_EventPacket_t)
 170                                 {
 171                                         .CableNumber = 0,
 172                                         .Command     = (MIDICommand >> 4),
 173
 174                                         .Data1       = MIDICommand | Channel,
 175                                         .Data2       = MIDIPitch,
 176                                         .Data3       = MIDI_STANDARD_VELOCITY,
 177                                 };
 178
 179                         /* Write the MIDI event packet to the endpoint */
 180                         Endpoint_Write_Stream_LE(&MIDIEvent, sizeof(MIDIEvent));
 181
 182                         /* Send the data in the endpoint to the host */
 183                         Endpoint_ClearIN();
 184                 }
 185
 186                 /* Save previous joystick value for next joystick change detection */
 187                 PrevJoystickStatus = JoystickStatus;
 188         }
 189
 190         /* Select the MIDI OUT stream */
 191         Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPNUM);
 192
 193         /* Check if endpoint is ready to be read from, if so discard its (unused) data */
 194         if (Endpoint_IsOUTReceived())
 195           Endpoint_ClearOUT();
 196 }