diff options
Diffstat (limited to 'Demos/AudioOutput/AudioOutput.c')
| -rw-r--r-- | Demos/AudioOutput/AudioOutput.c | 299 |
1 files changed, 0 insertions, 299 deletions
diff --git a/Demos/AudioOutput/AudioOutput.c b/Demos/AudioOutput/AudioOutput.c deleted file mode 100644 index 0f390f001..000000000 --- a/Demos/AudioOutput/AudioOutput.c +++ /dev/null @@ -1,299 +0,0 @@ -/*
- 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 Audio Output demo. This file contains the main tasks of the demo and
- * is responsible for the initial application hardware configuration.
- */
-
-#include "AudioOutput.h"
-
-/* Project Tags, for reading out using the ButtLoad project */
-BUTTLOADTAG(ProjName, "LUFA AudioOut 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_Audio_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 */
- clock_prescale_set(clock_div_1);
-
- /* Hardware Initialization */
- LEDs_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, and
- * configures the sample update and PWM timers.
- */
-EVENT_HANDLER(USB_Connect)
-{
- /* Start USB management task */
- Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
-
- /* Indicate USB enumerating */
- UpdateStatus(Status_USBEnumerating);
-
- /* Sample reload timer initialization */
- OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY);
- TCCR0A = (1 << WGM01); // CTC mode
- TCCR0B = (1 << CS00); // Fcpu speed
-
-#if defined(AUDIO_OUT_MONO)
- /* Set speaker as output */
- DDRC |= (1 << 6);
-#elif defined(AUDIO_OUT_STEREO)
- /* Set speakers as outputs */
- DDRC |= ((1 << 6) | (1 << 5));
-#elif defined(AUDIO_OUT_PORTC)
- /* Set PORTC as outputs */
- DDRC |= 0xFF;
-#endif
-
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
- /* PWM speaker timer initialization */
- TCCRxA = ((1 << WGMx0) | (1 << COMxA1) | (1 << COMxA0)
- | (1 << COMxB1) | (1 << COMxB0)); // Set on match, clear on TOP
- TCCRxB = ((1 << WGMx2) | (1 << CSx0)); // Fast 8-Bit PWM, Fcpu speed
-#endif
-}
-
-/** 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 Audio management tasks.
- */
-EVENT_HANDLER(USB_Disconnect)
-{
- /* Stop the timers */
- TCCR0B = 0;
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
- TCCRxB = 0;
-#endif
-
-#if defined(AUDIO_OUT_MONO)
- /* Set speaker as input to reduce current draw */
- DDRC &= ~(1 << 6);
-#elif defined(AUDIO_OUT_STEREO)
- /* Set speakers as inputs to reduce current draw */
- DDRC &= ~((1 << 6) | (1 << 5));
-#elif defined(AUDIO_OUT_PORTC)
- /* Set PORTC low */
- PORTC = 0x00;
-#endif
-
- /* Stop running audio and USB management tasks */
- Scheduler_SetTaskMode(USB_Audio_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.
- */
-EVENT_HANDLER(USB_ConfigurationChanged)
-{
- /* Setup audio stream endpoint */
- Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS,
- ENDPOINT_DIR_OUT, AUDIO_STREAM_EPSIZE,
- ENDPOINT_BANK_DOUBLE);
-
- /* Indicate USB connected and ready */
- UpdateStatus(Status_USBReady);
-}
-
-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
- * control requests that are not handled internally by the USB library (including the Audio class-specific
- * requests) so that they can be handled appropriately for the application.
- */
-EVENT_HANDLER(USB_UnhandledControlPacket)
-{
- /* Process General and Audio specific control requests */
- switch (bRequest)
- {
- case REQ_SetInterface:
- /* Set Interface is not handled by the library, as its function is application-specific */
- if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
- {
- uint16_t wValue = Endpoint_Read_Word_LE();
-
- Endpoint_ClearSetupReceived();
-
- /* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */
- if (wValue)
- {
- /* Start audio task */
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_RUN);
- }
- else
- {
- /* Stop audio task */
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP);
- }
-
- /* Acknowledge status stage */
- while (!(Endpoint_IsSetupINReady()));
- Endpoint_ClearSetupIN();
- }
-
- break;
- }
-}
-
-/** 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 AudioOutput_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);
-}
-
-/** Task to manage the Audio interface, reading in audio samples from the host, and outputting them to the speakers/LEDs as
- * desired.
- */
-TASK(USB_Audio_Task)
-{
- /* Select the audio stream endpoint */
- Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);
-
- /* Check if the current endpoint can be read from (contains a packet) and that the next sample should be read */
- if (Endpoint_ReadWriteAllowed() && (TIFR0 & (1 << OCF0A)))
- {
- /* Clear the sample reload timer */
- TIFR0 |= (1 << OCF0A);
-
- /* Retreive the signed 16-bit left and right audio samples */
- int16_t LeftSample_16Bit = (int16_t)Endpoint_Read_Word_LE();
- int16_t RightSample_16Bit = (int16_t)Endpoint_Read_Word_LE();
-
- /* Check to see if the bank is now empty */
- if (!(Endpoint_ReadWriteAllowed()))
- {
- /* Acknowledge the packet, clear the bank ready for the next packet */
- Endpoint_ClearCurrentBank();
- }
-
- /* Massage signed 16-bit left and right audio samples into signed 8-bit */
- int8_t LeftSample_8Bit = (LeftSample_16Bit >> 8);
- int8_t RightSample_8Bit = (RightSample_16Bit >> 8);
-
-#if defined(AUDIO_OUT_MONO)
- /* Mix the two channels together to produce a mono, 8-bit sample */
- int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);
-
- /* Load the sample into the PWM timer channel */
- OCRxA = ((uint8_t)MixedSample_8Bit ^ (1 << 7));
-#elif defined(AUDIO_OUT_STEREO)
- /* Load the dual 8-bit samples into the PWM timer channels */
- OCRxA = ((uint8_t)LeftSample_8Bit ^ (1 << 7));
- OCRxB = ((uint8_t)RightSample_8Bit ^ (1 << 7));
-#elif defined(AUDIO_OUT_PORTC)
- /* Mix the two channels together to produce a mono, 8-bit sample */
- int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);
-
- PORTC = MixedSample_8Bit;
-#else
- uint8_t LEDMask = LEDS_NO_LEDS;
-
- /* Make left channel positive (absolute) */
- if (LeftSample_8Bit < 0)
- LeftSample_8Bit = -LeftSample_8Bit;
-
- /* Make right channel positive (absolute) */
- if (RightSample_8Bit < 0)
- RightSample_8Bit = -RightSample_8Bit;
-
- /* Set first LED based on sample value */
- if (LeftSample_8Bit < ((128 / 8) * 1))
- LEDMask |= LEDS_LED2;
- else if (LeftSample_8Bit < ((128 / 8) * 3))
- LEDMask |= (LEDS_LED1 | LEDS_LED2);
- else
- LEDMask |= LEDS_LED1;
-
- /* Set second LED based on sample value */
- if (RightSample_8Bit < ((128 / 8) * 1))
- LEDMask |= LEDS_LED4;
- else if (RightSample_8Bit < ((128 / 8) * 3))
- LEDMask |= (LEDS_LED3 | LEDS_LED4);
- else
- LEDMask |= LEDS_LED3;
-
- LEDs_SetAllLEDs(LEDMask);
-#endif
- }
-}
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