Demos/Device/LowLevel/MIDI/MIDI.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  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         bool ConfigSuccess = true;
  95
  96         /* Setup MIDI Data Endpoints */
  97         ConfigSuccess &= Endpoint_ConfigureEndpoint(MIDI_STREAM_IN_EPNUM, EP_TYPE_BULK, ENDPOINT_DIR_IN,
  98                                                     MIDI_STREAM_EPSIZE, ENDPOINT_BANK_SINGLE);
  99         ConfigSuccess &= Endpoint_ConfigureEndpoint(MIDI_STREAM_OUT_EPNUM, EP_TYPE_BULK, ENDPOINT_DIR_OUT,
 100                                                     MIDI_STREAM_EPSIZE, ENDPOINT_BANK_SINGLE);
 101
 102         /* Indicate endpoint configuration success or failure */
 103         LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 104 }
 105
 106 /** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
 107  *  to the host.
 108  */
 109 void MIDI_Task(void)
 110 {
 111         static uint8_t PrevJoystickStatus;
 112
 113         /* Device must be connected and configured for the task to run */
 114         if (USB_DeviceState != DEVICE_STATE_Configured)
 115           return;
 116
 117         Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPNUM);
 118
 119         if (Endpoint_IsINReady())
 120         {
 121                 uint8_t MIDICommand = 0;
 122                 uint8_t MIDIPitch;
 123
 124                 uint8_t JoystickStatus  = Joystick_GetStatus();
 125                 uint8_t JoystickChanges = (JoystickStatus ^ PrevJoystickStatus);
 126
 127                 /* Get board button status - if pressed use channel 10 (percussion), otherwise use channel 1 */
 128                 uint8_t Channel = ((Buttons_GetStatus() & BUTTONS_BUTTON1) ? MIDI_CHANNEL(10) : MIDI_CHANNEL(1));
 129
 130                 if (JoystickChanges & JOY_LEFT)
 131                 {
 132                         MIDICommand = ((JoystickStatus & JOY_LEFT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 133                         MIDIPitch   = 0x3C;
 134                 }
 135
 136                 if (JoystickChanges & JOY_UP)
 137                 {
 138                         MIDICommand = ((JoystickStatus & JOY_UP)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 139                         MIDIPitch   = 0x3D;
 140                 }
 141
 142                 if (JoystickChanges & JOY_RIGHT)
 143                 {
 144                         MIDICommand = ((JoystickStatus & JOY_RIGHT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 145                         MIDIPitch   = 0x3E;
 146                 }
 147
 148                 if (JoystickChanges & JOY_DOWN)
 149                 {
 150                         MIDICommand = ((JoystickStatus & JOY_DOWN)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 151                         MIDIPitch   = 0x3F;
 152                 }
 153
 154                 if (JoystickChanges & JOY_PRESS)
 155                 {
 156                         MIDICommand = ((JoystickStatus & JOY_PRESS)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 157                         MIDIPitch   = 0x3B;
 158                 }
 159
 160                 /* Check if a MIDI command is to be sent */
 161                 if (MIDICommand)
 162                 {
 163                         MIDI_EventPacket_t MIDIEvent = (MIDI_EventPacket_t)
 164                                 {
 165                                         .CableNumber = 0,
 166                                         .Command     = (MIDICommand >> 4),
 167
 168                                         .Data1       = MIDICommand | Channel,
 169                                         .Data2       = MIDIPitch,
 170                                         .Data3       = MIDI_STANDARD_VELOCITY,
 171                                 };
 172
 173                         /* Write the MIDI event packet to the endpoint */
 174                         Endpoint_Write_Stream_LE(&MIDIEvent, sizeof(MIDIEvent), NULL);
 175
 176                         /* Send the data in the endpoint to the host */
 177                         Endpoint_ClearIN();
 178                 }
 179
 180                 /* Save previous joystick value for next joystick change detection */
 181                 PrevJoystickStatus = JoystickStatus;
 182         }
 183
 184         /* Select the MIDI OUT stream */
 185         Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPNUM);
 186
 187         /* Check if a MIDI command has been received */
 188         if (Endpoint_IsOUTReceived())
 189         {
 190                 MIDI_EventPacket_t MIDIEvent;
 191
 192                 /* Read the MIDI event packet from the endpoint */
 193                 Endpoint_Read_Stream_LE(&MIDIEvent, sizeof(MIDIEvent), NULL);
 194
 195                 /* Check to see if the sent command is a note on message with a non-zero velocity */
 196                 if ((MIDIEvent.Command == (MIDI_COMMAND_NOTE_ON >> 4)) && (MIDIEvent.Data3 > 0))
 197                 {
 198                         /* Change LEDs depending on the pitch of the sent note */
 199                         LEDs_SetAllLEDs(MIDIEvent.Data2 > 64 ? LEDS_LED1 : LEDS_LED2);
 200                 }
 201                 else
 202                 {
 203                         /* Turn off all LEDs in response to non Note On messages */
 204                         LEDs_SetAllLEDs(LEDS_NO_LEDS);
 205                 }
 206
 207                 /* If the endpoint is now empty, clear the bank */
 208                 if (!(Endpoint_BytesInEndpoint()))
 209                 {
 210                         /* Clear the endpoint ready for new packet */
 211                         Endpoint_ClearOUT();
 212                 }
 213         }
 214 }
 215