Demos/Device/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 /* Scheduler Task List */
  40 TASK_LIST
  41 {
  42         { .Task = USB_USBTask          , .TaskStatus = TASK_STOP },
  43         { .Task = USB_MIDI_Task        , .TaskStatus = TASK_STOP },
  44 };
  45
  46 /** Main program entry point. This routine configures the hardware required by the application, then
  47  *  starts the scheduler to run the application tasks.
  48  */
  49 int main(void)
  50 {
  51         /* Disable watchdog if enabled by bootloader/fuses */
  52         MCUSR &= ~(1 << WDRF);
  53         wdt_disable();
  54
  55         /* Disable clock division */
  56         clock_prescale_set(clock_div_1);
  57
  58         /* Hardware Initialization */
  59         Joystick_Init();
  60         LEDs_Init();
  61         Buttons_Init();
  62
  63         /* Indicate USB not ready */
  64         UpdateStatus(Status_USBNotReady);
  65
  66         /* Initialize Scheduler so that it can be used */
  67         Scheduler_Init();
  68
  69         /* Initialize USB Subsystem */
  70         USB_Init();
  71
  72         /* Scheduling - routine never returns, so put this last in the main function */
  73         Scheduler_Start();
  74 }
  75
  76 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
  77 void EVENT_USB_Connect(void)
  78 {
  79         /* Start USB management task */
  80         Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
  81
  82         /* Indicate USB enumerating */
  83         UpdateStatus(Status_USBEnumerating);
  84 }
  85
  86 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
  87  *  the status LEDs, disables the sample update and PWM output timers and stops the USB and MIDI management tasks.
  88  */
  89 void EVENT_USB_Disconnect(void)
  90 {
  91         /* Stop running audio and USB management tasks */
  92         Scheduler_SetTaskMode(USB_MIDI_Task, TASK_STOP);
  93         Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
  94
  95         /* Indicate USB not ready */
  96         UpdateStatus(Status_USBNotReady);
  97 }
  98
  99 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
 100  *  of the USB device after enumeration - the device endpoints are configured and the MIDI management task started.
 101  */
 102 void EVENT_USB_ConfigurationChanged(void)
 103 {
 104         /* Setup MIDI stream endpoints */
 105         Endpoint_ConfigureEndpoint(MIDI_STREAM_OUT_EPNUM, EP_TYPE_BULK,
 106                                        ENDPOINT_DIR_OUT, MIDI_STREAM_EPSIZE,
 107                                    ENDPOINT_BANK_SINGLE);
 108
 109         Endpoint_ConfigureEndpoint(MIDI_STREAM_IN_EPNUM, EP_TYPE_BULK,
 110                                        ENDPOINT_DIR_IN, MIDI_STREAM_EPSIZE,
 111                                    ENDPOINT_BANK_SINGLE);
 112
 113         /* Indicate USB connected and ready */
 114         UpdateStatus(Status_USBReady);
 115
 116         /* Start MIDI task */
 117         Scheduler_SetTaskMode(USB_MIDI_Task, TASK_RUN);
 118 }
 119
 120 /** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
 121  *  to the host.
 122  */
 123 TASK(USB_MIDI_Task)
 124 {
 125         static uint8_t PrevJoystickStatus;
 126
 127         /* Select the MIDI IN stream */
 128         Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPNUM);
 129
 130         /* Check if endpoint is ready to be written to */
 131         if (Endpoint_IsINReady())
 132         {
 133                 /* Get current joystick mask, XOR with previous to detect joystick changes */
 134                 uint8_t JoystickStatus  = Joystick_GetStatus();
 135                 uint8_t JoystickChanges = (JoystickStatus ^ PrevJoystickStatus);
 136
 137                 /* Get board button status - if pressed use channel 10 (percussion), otherwise use channel 1 */
 138                 uint8_t Channel = ((Buttons_GetStatus() & BUTTONS_BUTTON1) ? MIDI_CHANNEL(10) : MIDI_CHANNEL(1));
 139
 140                 if (JoystickChanges & JOY_LEFT)
 141                   SendMIDINoteChange(0x3C, (JoystickStatus & JOY_LEFT), 0, Channel);
 142
 143                 if (JoystickChanges & JOY_UP)
 144                   SendMIDINoteChange(0x3D, (JoystickStatus & JOY_UP), 0, Channel);
 145
 146                 if (JoystickChanges & JOY_RIGHT)
 147                   SendMIDINoteChange(0x3E, (JoystickStatus & JOY_RIGHT), 0, Channel);
 148
 149                 if (JoystickChanges & JOY_DOWN)
 150                   SendMIDINoteChange(0x3F, (JoystickStatus & JOY_DOWN), 0, Channel);
 151
 152                 if (JoystickChanges & JOY_PRESS)
 153                   SendMIDINoteChange(0x3B, (JoystickStatus & JOY_PRESS), 0, Channel);
 154
 155                 /* Save previous joystick value for next joystick change detection */
 156                 PrevJoystickStatus = JoystickStatus;
 157         }
 158
 159         /* Select the MIDI OUT stream */
 160         Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPNUM);
 161
 162         /* Check if endpoint is ready to be read from, if so discard its (unused) data */
 163         if (Endpoint_IsOUTReceived())
 164           Endpoint_ClearOUT();
 165 }
 166
 167 /** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
 168  *  log to a serial port, or anything else that is suitable for status updates.
 169  *
 170  *  \param CurrentStatus  Current status of the system, from the MIDI_StatusCodes_t enum
 171  */
 172 void UpdateStatus(uint8_t CurrentStatus)
 173 {
 174         uint8_t LEDMask = LEDS_NO_LEDS;
 175
 176         /* Set the LED mask to the appropriate LED mask based on the given status code */
 177         switch (CurrentStatus)
 178         {
 179                 case Status_USBNotReady:
 180                         LEDMask = (LEDS_LED1);
 181                         break;
 182                 case Status_USBEnumerating:
 183                         LEDMask = (LEDS_LED1 | LEDS_LED2);
 184                         break;
 185                 case Status_USBReady:
 186                         LEDMask = (LEDS_LED2 | LEDS_LED4);
 187                         break;
 188         }
 189
 190         /* Set the board LEDs to the new LED mask */
 191         LEDs_SetAllLEDs(LEDMask);
 192 }
 193
 194 /** Sends a MIDI note change event (note on or off) to the MIDI output jack, on the given virtual cable ID and channel.
 195  *
 196  *  \param Pitch    Pitch of the note to turn on or off
 197  *  \param OnOff    Set to true if the note is on (being held down), or false otherwise
 198  *  \param CableID  ID of the virtual cable to send the note change to
 199  *  \param Channel  MIDI channel number to send the note change event to
 200  */
 201 void SendMIDINoteChange(const uint8_t Pitch, const bool OnOff, const uint8_t CableID, const uint8_t Channel)
 202 {
 203         /* Wait until endpoint ready for more data */
 204         while (!(Endpoint_IsReadWriteAllowed()));
 205
 206         /* Check if the message should be a Note On or Note Off command */
 207         uint8_t Command = ((OnOff)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 208
 209         /* Write the Packet Header to the endpoint */
 210         Endpoint_Write_Byte((CableID << 4) | (Command >> 4));
 211
 212         /* Write the Note On/Off command with the specified channel, pitch and velocity */
 213         Endpoint_Write_Byte(Command | Channel);
 214         Endpoint_Write_Byte(Pitch);
 215         Endpoint_Write_Byte(MIDI_STANDARD_VELOCITY);
 216
 217         /* Send the data in the endpoint to the host */
 218         Endpoint_ClearIN();
 219 }