protocol/lufa/LUFA-git/Demos/Device/LowLevel/MIDI/MIDI.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2014  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 #if (ARCH == ARCH_AVR8)
  60         /* Disable watchdog if enabled by bootloader/fuses */
  61         MCUSR &= ~(1 << WDRF);
  62         wdt_disable();
  63
  64         /* Disable clock division */
  65         clock_prescale_set(clock_div_1);
  66 #elif (ARCH == ARCH_XMEGA)
  67         /* Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it */
  68         XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, F_CPU);
  69         XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL);
  70
  71         /* Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference */
  72         XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
  73         XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB);
  74
  75         PMIC.CTRL = PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;
  76 #endif
  77
  78         /* Hardware Initialization */
  79         Joystick_Init();
  80         LEDs_Init();
  81         Buttons_Init();
  82         USB_Init();
  83 }
  84
  85 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
  86 void EVENT_USB_Device_Connect(void)
  87 {
  88         /* Indicate USB enumerating */
  89         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  90 }
  91
  92 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
  93  *  the status LEDs, disables the sample update and PWM output timers and stops the USB and MIDI management tasks.
  94  */
  95 void EVENT_USB_Device_Disconnect(void)
  96 {
  97         /* Indicate USB not ready */
  98         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  99 }
 100
 101 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
 102  *  of the USB device after enumeration - the device endpoints are configured and the MIDI management task started.
 103  */
 104 void EVENT_USB_Device_ConfigurationChanged(void)
 105 {
 106         bool ConfigSuccess = true;
 107
 108         /* Setup MIDI Data Endpoints */
 109         ConfigSuccess &= Endpoint_ConfigureEndpoint(MIDI_STREAM_IN_EPADDR, EP_TYPE_BULK, MIDI_STREAM_EPSIZE, 1);
 110         ConfigSuccess &= Endpoint_ConfigureEndpoint(MIDI_STREAM_OUT_EPADDR, EP_TYPE_BULK, MIDI_STREAM_EPSIZE, 1);
 111
 112         /* Indicate endpoint configuration success or failure */
 113         LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 114 }
 115
 116 /** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
 117  *  to the host.
 118  */
 119 void MIDI_Task(void)
 120 {
 121         static uint8_t PrevJoystickStatus;
 122
 123         /* Device must be connected and configured for the task to run */
 124         if (USB_DeviceState != DEVICE_STATE_Configured)
 125           return;
 126
 127         Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPADDR);
 128
 129         if (Endpoint_IsINReady())
 130         {
 131                 uint8_t MIDICommand = 0;
 132                 uint8_t MIDIPitch;
 133
 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                 {
 142                         MIDICommand = ((JoystickStatus & JOY_LEFT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 143                         MIDIPitch   = 0x3C;
 144                 }
 145
 146                 if (JoystickChanges & JOY_UP)
 147                 {
 148                         MIDICommand = ((JoystickStatus & JOY_UP)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 149                         MIDIPitch   = 0x3D;
 150                 }
 151
 152                 if (JoystickChanges & JOY_RIGHT)
 153                 {
 154                         MIDICommand = ((JoystickStatus & JOY_RIGHT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 155                         MIDIPitch   = 0x3E;
 156                 }
 157
 158                 if (JoystickChanges & JOY_DOWN)
 159                 {
 160                         MIDICommand = ((JoystickStatus & JOY_DOWN)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 161                         MIDIPitch   = 0x3F;
 162                 }
 163
 164                 if (JoystickChanges & JOY_PRESS)
 165                 {
 166                         MIDICommand = ((JoystickStatus & JOY_PRESS)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
 167                         MIDIPitch   = 0x3B;
 168                 }
 169
 170                 /* Check if a MIDI command is to be sent */
 171                 if (MIDICommand)
 172                 {
 173                         MIDI_EventPacket_t MIDIEvent = (MIDI_EventPacket_t)
 174                                 {
 175                                         .Event       = MIDI_EVENT(0, MIDICommand),
 176
 177                                         .Data1       = MIDICommand | Channel,
 178                                         .Data2       = MIDIPitch,
 179                                         .Data3       = MIDI_STANDARD_VELOCITY,
 180                                 };
 181
 182                         /* Write the MIDI event packet to the endpoint */
 183                         Endpoint_Write_Stream_LE(&MIDIEvent, sizeof(MIDIEvent), NULL);
 184
 185                         /* Send the data in the endpoint to the host */
 186                         Endpoint_ClearIN();
 187                 }
 188
 189                 /* Save previous joystick value for next joystick change detection */
 190                 PrevJoystickStatus = JoystickStatus;
 191         }
 192
 193         /* Select the MIDI OUT stream */
 194         Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPADDR);
 195
 196         /* Check if a MIDI command has been received */
 197         if (Endpoint_IsOUTReceived())
 198         {
 199                 MIDI_EventPacket_t MIDIEvent;
 200
 201                 /* Read the MIDI event packet from the endpoint */
 202                 Endpoint_Read_Stream_LE(&MIDIEvent, sizeof(MIDIEvent), NULL);
 203
 204                 /* Check to see if the sent command is a note on message with a non-zero velocity */
 205                 if ((MIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_ON)) && (MIDIEvent.Data3 > 0))
 206                 {
 207                         /* Change LEDs depending on the pitch of the sent note */
 208                         LEDs_SetAllLEDs(MIDIEvent.Data2 > 64 ? LEDS_LED1 : LEDS_LED2);
 209                 }
 210                 else
 211                 {
 212                         /* Turn off all LEDs in response to non Note On messages */
 213                         LEDs_SetAllLEDs(LEDS_NO_LEDS);
 214                 }
 215
 216                 /* If the endpoint is now empty, clear the bank */
 217                 if (!(Endpoint_BytesInEndpoint()))
 218                 {
 219                         /* Clear the endpoint ready for new packet */
 220                         Endpoint_ClearOUT();
 221                 }
 222         }
 223 }
 224