225 lines
7.7 KiB
C
225 lines
7.7 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the MIDI input demo. This file contains the main tasks of the demo and
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* is responsible for the initial application hardware configuration.
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*/
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#include "MIDI.h"
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/* Project Tags, for reading out using the ButtLoad project */
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BUTTLOADTAG(ProjName, "LUFA MIDI App");
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BUTTLOADTAG(BuildTime, __TIME__);
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BUTTLOADTAG(BuildDate, __DATE__);
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BUTTLOADTAG(LUFAVersion, "LUFA V" LUFA_VERSION_STRING);
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/* Scheduler Task List */
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TASK_LIST
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{
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{ Task: USB_USBTask , TaskStatus: TASK_STOP },
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{ Task: USB_MIDI_Task , TaskStatus: TASK_STOP },
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};
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/** Main program entry point. This routine configures the hardware required by the application, then
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* starts the scheduler to run the application tasks.
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*/
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int main(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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/* Hardware Initialization */
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Joystick_Init();
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LEDs_Init();
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HWB_Init();
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/* Indicate USB not ready */
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UpdateStatus(Status_USBNotReady);
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/* Initialize Scheduler so that it can be used */
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Scheduler_Init();
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/* Initialize USB Subsystem */
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USB_Init();
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/* Scheduling - routine never returns, so put this last in the main function */
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Scheduler_Start();
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}
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/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
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EVENT_HANDLER(USB_Connect)
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{
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/* Start USB management task */
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Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
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/* Indicate USB enumerating */
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UpdateStatus(Status_USBEnumerating);
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}
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/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
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* the status LEDs, disables the sample update and PWM output timers and stops the USB and MIDI management tasks.
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*/
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EVENT_HANDLER(USB_Disconnect)
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{
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/* Stop running audio and USB management tasks */
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Scheduler_SetTaskMode(USB_MIDI_Task, TASK_STOP);
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Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
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/* Indicate USB not ready */
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UpdateStatus(Status_USBNotReady);
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}
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/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
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* of the USB device after enumeration - the device endpoints are configured and the MIDI management task started.
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*/
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EVENT_HANDLER(USB_ConfigurationChanged)
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{
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/* Setup MIDI stream endpoints */
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Endpoint_ConfigureEndpoint(MIDI_STREAM_OUT_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_OUT, MIDI_STREAM_EPSIZE,
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ENDPOINT_BANK_SINGLE);
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Endpoint_ConfigureEndpoint(MIDI_STREAM_IN_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_IN, MIDI_STREAM_EPSIZE,
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ENDPOINT_BANK_SINGLE);
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/* Indicate USB connected and ready */
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UpdateStatus(Status_USBReady);
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/* Start MIDI task */
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Scheduler_SetTaskMode(USB_MIDI_Task, TASK_RUN);
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}
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/** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
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* to the host.
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*/
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TASK(USB_MIDI_Task)
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{
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static uint8_t PrevJoystickStatus;
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/* Select the MIDI IN stream */
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Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPNUM);
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/* Check if endpoint is ready to be written to */
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if (Endpoint_ReadWriteAllowed())
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{
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/* Get current joystick mask, XOR with previous to detect joystick changes */
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uint8_t JoystickStatus = Joystick_GetStatus();
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uint8_t JoystickChanges = (JoystickStatus ^ PrevJoystickStatus);
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/* Get HWB status - if set use channel 10 (percussion), otherwise use channel 1 */
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uint8_t Channel = ((HWB_GetStatus()) ? MIDI_CHANNEL(10) : MIDI_CHANNEL(1));
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if (JoystickChanges & JOY_LEFT)
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SendMIDINoteChange(0x3C, (JoystickStatus & JOY_LEFT), 0, Channel);
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if (JoystickChanges & JOY_UP)
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SendMIDINoteChange(0x3D, (JoystickStatus & JOY_UP), 0, Channel);
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if (JoystickChanges & JOY_RIGHT)
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SendMIDINoteChange(0x3E, (JoystickStatus & JOY_RIGHT), 0, Channel);
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if (JoystickChanges & JOY_DOWN)
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SendMIDINoteChange(0x3F, (JoystickStatus & JOY_DOWN), 0, Channel);
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if (JoystickChanges & JOY_PRESS)
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SendMIDINoteChange(0x3B, (JoystickStatus & JOY_PRESS), 0, Channel);
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/* Save previous joystick value for next joystick change detection */
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PrevJoystickStatus = JoystickStatus;
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}
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/* Select the MIDI OUT stream */
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Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPNUM);
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/* Check if endpoint is ready to be read from, if so discard its (unused) data */
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if (Endpoint_ReadWriteAllowed())
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Endpoint_ClearCurrentBank();
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}
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/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
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* log to a serial port, or anything else that is suitable for status updates.
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*
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* \param CurrentStatus Current status of the system, from the MIDI_StatusCodes_t enum
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*/
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void UpdateStatus(uint8_t CurrentStatus)
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{
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uint8_t LEDMask = LEDS_NO_LEDS;
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/* Set the LED mask to the appropriate LED mask based on the given status code */
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switch (CurrentStatus)
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{
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case Status_USBNotReady:
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LEDMask = (LEDS_LED1);
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break;
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case Status_USBEnumerating:
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LEDMask = (LEDS_LED1 | LEDS_LED2);
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break;
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case Status_USBReady:
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LEDMask = (LEDS_LED2 | LEDS_LED4);
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break;
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}
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/* Set the board LEDs to the new LED mask */
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LEDs_SetAllLEDs(LEDMask);
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}
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/** Sends a MIDI note change event (note on or off) to the MIDI output jack, on the given virtual cable ID and channel.
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*
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* \param Pitch Pitch of the note to turn on or off
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* \param OnOff Set to true if the note is on (being held down), or false otherwise
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* \param CableID ID of the virtual cable to send the note change to
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* \param Channel MIDI channel number to send the note change event to
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*/
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void SendMIDINoteChange(const uint8_t Pitch, const bool OnOff, const uint8_t CableID, const uint8_t Channel)
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{
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/* Wait until endpoint ready for more data */
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while (!(Endpoint_ReadWriteAllowed()));
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/* Check if the message should be a Note On or Note Off command */
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uint8_t Command = ((OnOff)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
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/* Write the Packet Header to the endpoint */
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Endpoint_Write_Byte((CableID << 4) | (Command >> 4));
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/* Write the Note On/Off command with the specified channel, pitch and velocity */
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Endpoint_Write_Byte(Command | Channel);
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Endpoint_Write_Byte(Pitch);
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Endpoint_Write_Byte(MIDI_STANDARD_VELOCITY);
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/* Send the data in the endpoint to the host */
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Endpoint_ClearCurrentBank();
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}
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