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Diffstat (limited to 'Demos/MIDI/MIDI.c')
| -rw-r--r-- | Demos/MIDI/MIDI.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/Demos/MIDI/MIDI.c b/Demos/MIDI/MIDI.c new file mode 100644 index 000000000..a9c827a0d --- /dev/null +++ b/Demos/MIDI/MIDI.c @@ -0,0 +1,225 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, provided that the above copyright notice appear in all
+ copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * Main source file for the MIDI input demo. This file contains the main tasks of the demo and
+ * is responsible for the initial application hardware configuration.
+ */
+
+#include "MIDI.h"
+
+/* Project Tags, for reading out using the ButtLoad project */
+BUTTLOADTAG(ProjName, "LUFA MIDI App");
+BUTTLOADTAG(BuildTime, __TIME__);
+BUTTLOADTAG(BuildDate, __DATE__);
+BUTTLOADTAG(LUFAVersion, "LUFA V" LUFA_VERSION_STRING);
+
+/* Scheduler Task List */
+TASK_LIST
+{
+ { Task: USB_USBTask , TaskStatus: TASK_STOP },
+ { Task: USB_MIDI_Task , TaskStatus: TASK_STOP },
+};
+
+/** Main program entry point. This routine configures the hardware required by the application, then
+ * starts the scheduler to run the application tasks.
+ */
+int main(void)
+{
+ /* Disable watchdog if enabled by bootloader/fuses */
+ MCUSR &= ~(1 << WDRF);
+ wdt_disable();
+
+ /* Disable Clock Division */
+ SetSystemClockPrescaler(0);
+
+ /* Hardware Initialization */
+ Joystick_Init();
+ LEDs_Init();
+ HWB_Init();
+
+ /* Indicate USB not ready */
+ UpdateStatus(Status_USBNotReady);
+
+ /* Initialize Scheduler so that it can be used */
+ Scheduler_Init();
+
+ /* Initialize USB Subsystem */
+ USB_Init();
+
+ /* Scheduling - routine never returns, so put this last in the main function */
+ Scheduler_Start();
+}
+
+/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
+EVENT_HANDLER(USB_Connect)
+{
+ /* Start USB management task */
+ Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
+
+ /* Indicate USB enumerating */
+ UpdateStatus(Status_USBEnumerating);
+}
+
+/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
+ * the status LEDs, disables the sample update and PWM output timers and stops the USB and MIDI management tasks.
+ */
+EVENT_HANDLER(USB_Disconnect)
+{
+ /* Stop running audio and USB management tasks */
+ Scheduler_SetTaskMode(USB_MIDI_Task, TASK_STOP);
+ Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
+
+ /* Indicate USB not ready */
+ UpdateStatus(Status_USBNotReady);
+}
+
+/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
+ * of the USB device after enumeration - the device endpoints are configured and the MIDI management task started.
+ */
+EVENT_HANDLER(USB_ConfigurationChanged)
+{
+ /* Setup MIDI stream endpoints */
+ Endpoint_ConfigureEndpoint(MIDI_STREAM_OUT_EPNUM, EP_TYPE_BULK,
+ ENDPOINT_DIR_OUT, MIDI_STREAM_EPSIZE,
+ ENDPOINT_BANK_SINGLE);
+
+ Endpoint_ConfigureEndpoint(MIDI_STREAM_IN_EPNUM, EP_TYPE_BULK,
+ ENDPOINT_DIR_IN, MIDI_STREAM_EPSIZE,
+ ENDPOINT_BANK_SINGLE);
+
+ /* Indicate USB connected and ready */
+ UpdateStatus(Status_USBReady);
+
+ /* Start MIDI task */
+ Scheduler_SetTaskMode(USB_MIDI_Task, TASK_RUN);
+}
+
+/** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
+ * to the host.
+ */
+TASK(USB_MIDI_Task)
+{
+ static uint8_t PrevJoystickStatus;
+
+ /* Select the MIDI IN stream */
+ Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPNUM);
+
+ /* Check if endpoint is ready to be written to */
+ if (Endpoint_ReadWriteAllowed())
+ {
+ /* Get current joystick mask, XOR with previous to detect joystick changes */
+ uint8_t JoystickStatus = Joystick_GetStatus();
+ uint8_t JoystickChanges = (JoystickStatus ^ PrevJoystickStatus);
+
+ /* Get HWB status - if set use channel 10 (percussion), otherwise use channel 1 */
+ uint8_t Channel = ((HWB_GetStatus()) ? MIDI_CHANNEL(10) : MIDI_CHANNEL(1));
+
+ if (JoystickChanges & JOY_LEFT)
+ SendMIDINoteChange(0x3C, (JoystickStatus & JOY_LEFT), 0, Channel);
+
+ if (JoystickChanges & JOY_UP)
+ SendMIDINoteChange(0x3D, (JoystickStatus & JOY_UP), 0, Channel);
+
+ if (JoystickChanges & JOY_RIGHT)
+ SendMIDINoteChange(0x3E, (JoystickStatus & JOY_RIGHT), 0, Channel);
+
+ if (JoystickChanges & JOY_DOWN)
+ SendMIDINoteChange(0x3F, (JoystickStatus & JOY_DOWN), 0, Channel);
+
+ if (JoystickChanges & JOY_PRESS)
+ SendMIDINoteChange(0x3B, (JoystickStatus & JOY_PRESS), 0, Channel);
+
+ /* Save previous joystick value for next joystick change detection */
+ PrevJoystickStatus = JoystickStatus;
+ }
+
+ /* Select the MIDI OUT stream */
+ Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPNUM);
+
+ /* Check if endpoint is ready to be read from, if so discard its (unused) data */
+ if (Endpoint_ReadWriteAllowed())
+ Endpoint_ClearCurrentBank();
+}
+
+/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
+ * log to a serial port, or anything else that is suitable for status updates.
+ *
+ * \param CurrentStatus Current status of the system, from the MIDI_StatusCodes_t enum
+ */
+void UpdateStatus(uint8_t CurrentStatus)
+{
+ uint8_t LEDMask = LEDS_NO_LEDS;
+
+ /* Set the LED mask to the appropriate LED mask based on the given status code */
+ switch (CurrentStatus)
+ {
+ case Status_USBNotReady:
+ LEDMask = (LEDS_LED1);
+ break;
+ case Status_USBEnumerating:
+ LEDMask = (LEDS_LED1 | LEDS_LED2);
+ break;
+ case Status_USBReady:
+ LEDMask = (LEDS_LED2 | LEDS_LED4);
+ break;
+ }
+
+ /* Set the board LEDs to the new LED mask */
+ LEDs_SetAllLEDs(LEDMask);
+}
+
+/** Sends a MIDI note change event (note on or off) to the MIDI output jack, on the given virtual cable ID and channel.
+ *
+ * \param Pitch Pitch of the note to turn on or off
+ * \param OnOff Set to true if the note is on (being held down), or false otherwise
+ * \param CableID ID of the virtual cable to send the note change to
+ * \param Channel MIDI channel number to send the note change event to
+ */
+void SendMIDINoteChange(const uint8_t Pitch, const bool OnOff, const uint8_t CableID, const uint8_t Channel)
+{
+ /* Wait until endpoint ready for more data */
+ while (!(Endpoint_ReadWriteAllowed()));
+
+ /* Check if the message should be a Note On or Note Off command */
+ uint8_t Command = ((OnOff)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
+
+ /* Write the Packet Header to the endpoint */
+ Endpoint_Write_Byte((CableID << 4) | (Command >> 4));
+
+ /* Write the Note On/Off command with the specified channel, pitch and velocity */
+ Endpoint_Write_Byte(Command | Channel);
+ Endpoint_Write_Byte(Pitch);
+ Endpoint_Write_Byte(MIDI_STANDARD_VELOCITY);
+
+ /* Send the data in the endpoint to the host */
+ Endpoint_ClearCurrentBank();
+}
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