Demos/Device/LowLevel/MIDI/MIDI.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2013.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2013  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 disclaims 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         GlobalInterruptEnable();
  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_EPADDR, EP_TYPE_BULK, MIDI_STREAM_EPSIZE, 1);
  98         ConfigSuccess &= Endpoint_ConfigureEndpoint(MIDI_STREAM_OUT_EPADDR, EP_TYPE_BULK, MIDI_STREAM_EPSIZE, 1);
  99
 100         /* Indicate endpoint configuration success or failure */
 101         LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 102 }
 103
 104 /** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
 105  *  to the host.
 106  */
 107 void MIDI_Task(void)
 108 {
 109         static uint8_t PrevJoystickStatus;
 110
 111         /* Device must be connected and configured for the task to run */
 112         if (USB_DeviceState != DEVICE_STATE_Configured)
 113           return;
 114
 115         Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPADDR);
 116
 117         if (Endpoint_IsINReady())
 118         {
 119                 uint8_t MIDICommand = 0;
 120                 uint8_t MIDIPitch;
 121
 122                 uint8_t JoystickStatus  = Joystick_GetStatus();
 123                 uint8_t JoystickChanges = (JoystickStatus ^ PrevJoystickStatus);
 124
 125                 /* Get board button status - if pressed use channel 10 (percussion), otherwise use channel 1 */
 126                 uint8_t Channel = ((Buttons_GetStatus() & BUTTONS_BUTTON1) ? MIDI_CHANNEL(10) : MIDI_CHANNEL(1));
 127
 128                 if (JoystickChanges & JOY_LEFT)
 129                 {
 130                         MIDICommand = ((JoystickStatus & JOY_LEFT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 131                         MIDIPitch   = 0x3C;
 132                 }
 133
 134                 if (JoystickChanges & JOY_UP)
 135                 {
 136                         MIDICommand = ((JoystickStatus & JOY_UP)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 137                         MIDIPitch   = 0x3D;
 138                 }
 139
 140                 if (JoystickChanges & JOY_RIGHT)
 141                 {
 142                         MIDICommand = ((JoystickStatus & JOY_RIGHT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 143                         MIDIPitch   = 0x3E;
 144                 }
 145
 146                 if (JoystickChanges & JOY_DOWN)
 147                 {
 148                         MIDICommand = ((JoystickStatus & JOY_DOWN)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 149                         MIDIPitch   = 0x3F;
 150                 }
 151
 152                 if (JoystickChanges & JOY_PRESS)
 153                 {
 154                         MIDICommand = ((JoystickStatus & JOY_PRESS)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 155                         MIDIPitch   = 0x3B;
 156                 }
 157
 158                 /* Check if a MIDI command is to be sent */
 159                 if (MIDICommand)
 160                 {
 161                         MIDI_EventPacket_t MIDIEvent = (MIDI_EventPacket_t)
 162                                 {
 163                                         .Event       = MIDI_EVENT(0, MIDICommand),
 164
 165                                         .Data1       = MIDICommand | Channel,
 166                                         .Data2       = MIDIPitch,
 167                                         .Data3       = MIDI_STANDARD_VELOCITY,
 168                                 };
 169
 170                         /* Write the MIDI event packet to the endpoint */
 171                         Endpoint_Write_Stream_LE(&MIDIEvent, sizeof(MIDIEvent), NULL);
 172
 173                         /* Send the data in the endpoint to the host */
 174                         Endpoint_ClearIN();
 175                 }
 176
 177                 /* Save previous joystick value for next joystick change detection */
 178                 PrevJoystickStatus = JoystickStatus;
 179         }
 180
 181         /* Select the MIDI OUT stream */
 182         Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPADDR);
 183
 184         /* Check if a MIDI command has been received */
 185         if (Endpoint_IsOUTReceived())
 186         {
 187                 MIDI_EventPacket_t MIDIEvent;
 188
 189                 /* Read the MIDI event packet from the endpoint */
 190                 Endpoint_Read_Stream_LE(&MIDIEvent, sizeof(MIDIEvent), NULL);
 191
 192                 /* Check to see if the sent command is a note on message with a non-zero velocity */
 193                 if ((MIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_ON)) && (MIDIEvent.Data3 > 0))
 194                 {
 195                         /* Change LEDs depending on the pitch of the sent note */
 196                         LEDs_SetAllLEDs(MIDIEvent.Data2 > 64 ? LEDS_LED1 : LEDS_LED2);
 197                 }
 198                 else
 199                 {
 200                         /* Turn off all LEDs in response to non Note On messages */
 201                         LEDs_SetAllLEDs(LEDS_NO_LEDS);
 202                 }
 203
 204                 /* If the endpoint is now empty, clear the bank */
 205                 if (!(Endpoint_BytesInEndpoint()))
 206                 {
 207                         /* Clear the endpoint ready for new packet */
 208                         Endpoint_ClearOUT();
 209                 }
 210         }
 211 }
 212