X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/ecf7538430c01b95104682f0f7493e57b9168125..ed031c1df2f5b053b9cd9f48c63e66a42b7c049e:/Demos/AudioInput/AudioInput.c diff --git a/Demos/AudioInput/AudioInput.c b/Demos/AudioInput/AudioInput.c deleted file mode 100644 index f41306f3b..000000000 --- a/Demos/AudioInput/AudioInput.c +++ /dev/null @@ -1,228 +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 Input demo. This file contains the main tasks of the demo and - * is responsible for the initial application hardware configuration. - */ - -#include "AudioInput.h" - -/* Project Tags, for reading out using the ButtLoad project */ -BUTTLOADTAG(ProjName, "LUFA AudioIn 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(); - ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32); - ADC_SetupChannel(MIC_IN_ADC_CHANNEL); - - /* Start the ADC conversion in free running mode */ - ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_CHANNEL); - - /* 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 -} - -/** 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 sample reload timer */ - TCCR0B = 0; - - /* 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_IN, 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 AudioInput_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 ADC samples from the microphone, and them to the host. */ -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 stored */ - if (Endpoint_ReadWriteAllowed() && (TIFR0 & (1 << OCF0A))) - { - /* Clear the sample reload timer */ - TIFR0 |= (1 << OCF0A); - - /* Audio sample is ADC value scaled to fit the entire range */ - int16_t AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult()); - -#if defined(MICROPHONE_BIASED_TO_HALF_RAIL) - /* Microphone is biased to half rail voltage, subtract the bias from the sample value */ - AudioSample -= (SAMPLE_MAX_RANGE / 2)); -#endif - - /* Write the sample to the buffer */ - Endpoint_Write_Word_LE(AudioSample); - - /* Check to see if the bank is now full */ - if (!(Endpoint_ReadWriteAllowed())) - { - /* Send the full packet to the host */ - Endpoint_ClearCurrentBank(); - } - } -}