X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/ecf7538430c01b95104682f0f7493e57b9168125..ed031c1df2f5b053b9cd9f48c63e66a42b7c049e:/Demos/AudioOutput/AudioOutput.c 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 - } -}