X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/e331b531c6e6d93eb0eee42b9002074e8090ad18..071e02c6b6b4837fa9cf0b6d4c749994e02638d7:/Demos/Device/LowLevel/AudioOutput/AudioOutput.c diff --git a/Demos/Device/LowLevel/AudioOutput/AudioOutput.c b/Demos/Device/LowLevel/AudioOutput/AudioOutput.c index 8cd6be17b..db6bc3c75 100644 --- a/Demos/Device/LowLevel/AudioOutput/AudioOutput.c +++ b/Demos/Device/LowLevel/AudioOutput/AudioOutput.c @@ -1,239 +1,239 @@ -/* - LUFA Library - Copyright (C) Dean Camera, 2010. - - dean [at] fourwalledcubicle [dot] com - www.fourwalledcubicle.com -*/ - -/* - Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com) - - Permission to use, copy, modify, distribute, and sell this - software and its documentation for any purpose is hereby granted - without fee, 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 AudioOutput demo. This file contains the main tasks of the demo and - * is responsible for the initial application hardware configuration. - */ - -#include "AudioOutput.h" - -/** Flag to indicate if the streaming audio alternative interface has been selected by the host. */ -bool StreamingAudioInterfaceSelected = false; - -/** Main program entry point. This routine contains the overall program flow, including initial - * setup of all components and the main program loop. - */ -int main(void) -{ - SetupHardware(); - - LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); - sei(); - - for (;;) - { - USB_Audio_Task(); - USB_USBTask(); - } -} - -/** Configures the board hardware and chip peripherals for the demo's functionality. */ -void SetupHardware(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(); - USB_Init(); -} - -/** 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. - */ -void EVENT_USB_Device_Connect(void) -{ - /* Indicate USB enumerating */ - LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING); - - /* Sample reload timer initialization */ - OCR0A = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1; - TCCR0A = (1 << WGM01); // CTC mode - TCCR0B = (1 << CS01); // Fcpu/8 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 */ - TCCR3A = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0) - | (1 << COM3B1) | (1 << COM3B0)); // Set on match, clear on TOP - TCCR3B = ((1 << WGM32) | (1 << CS30)); // 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. - */ -void EVENT_USB_Device_Disconnect(void) -{ - /* Stop the timers */ - TCCR0B = 0; -#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO)) - TCCR3B = 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 - - /* Indicate streaming audio interface not selected */ - StreamingAudioInterfaceSelected = false; - - /* Indicate USB not ready */ - LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); -} - -/** 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. - */ -void EVENT_USB_Device_ConfigurationChanged(void) -{ - /* Indicate USB connected and ready */ - LEDs_SetAllLEDs(LEDMASK_USB_READY); - - /* Setup audio stream endpoint */ - if (!(Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS, - ENDPOINT_DIR_OUT, AUDIO_STREAM_EPSIZE, - ENDPOINT_BANK_DOUBLE))) - { - LEDs_SetAllLEDs(LEDMASK_USB_ERROR); - } -} - -/** Event handler for the USB_UnhandledControlRequest 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. - */ -void EVENT_USB_Device_UnhandledControlRequest(void) -{ - /* Process General and Audio specific control requests */ - switch (USB_ControlRequest.bRequest) - { - case REQ_SetInterface: - /* Set Interface is not handled by the library, as its function is application-specific */ - if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE)) - { - Endpoint_ClearSETUP(); - - /* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */ - StreamingAudioInterfaceSelected = ((USB_ControlRequest.wValue) != 0); - - Endpoint_ClearStatusStage(); - } - - break; - } -} - -/** Task to manage the Audio interface, reading in audio samples from the host, and outputting them to the speakers/LEDs as - * desired. - */ -void USB_Audio_Task(void) -{ - /* Device must be connected and configured for the task to run */ - if (USB_DeviceState != DEVICE_STATE_Configured) - return; - - /* Check to see if the streaming interface is selected, if not the host is not receiving audio */ - if (!(StreamingAudioInterfaceSelected)) - return; - - /* 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_IsOUTReceived() && (TIFR0 & (1 << OCF0A))) - { - /* Clear the sample reload timer */ - TIFR0 |= (1 << OCF0A); - - /* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */ - int8_t LeftSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8); - int8_t RightSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8); - - /* 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); - - /* Check to see if the bank is now empty */ - if (!(Endpoint_IsReadWriteAllowed())) - { - /* Acknowledge the packet, clear the bank ready for the next packet */ - Endpoint_ClearOUT(); - } - -#if defined(AUDIO_OUT_MONO) - /* Load the sample into the PWM timer channel */ - OCR3A = (MixedSample_8Bit ^ (1 << 7)); -#elif defined(AUDIO_OUT_STEREO) - /* Load the dual 8-bit samples into the PWM timer channels */ - OCR3A = (LeftSample_8Bit ^ (1 << 7)); - OCR3B = (RightSample_8Bit ^ (1 << 7)); -#elif defined(AUDIO_OUT_PORTC) - /* Load the 8-bit mixed sample into PORTC */ - PORTC = MixedSample_8Bit; -#endif - - uint8_t LEDMask = LEDS_NO_LEDS; - - /* Turn on LEDs as the sample amplitude increases */ - if (MixedSample_8Bit > 16) - LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4); - else if (MixedSample_8Bit > 8) - LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3); - else if (MixedSample_8Bit > 4) - LEDMask = (LEDS_LED1 | LEDS_LED2); - else if (MixedSample_8Bit > 2) - LEDMask = (LEDS_LED1); - - LEDs_SetAllLEDs(LEDMask); - } -} +/* + LUFA Library + Copyright (C) Dean Camera, 2010. + + dean [at] fourwalledcubicle [dot] com + www.fourwalledcubicle.com +*/ + +/* + Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, 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 AudioOutput demo. This file contains the main tasks of the demo and + * is responsible for the initial application hardware configuration. + */ + +#include "AudioOutput.h" + +/** Flag to indicate if the streaming audio alternative interface has been selected by the host. */ +bool StreamingAudioInterfaceSelected = false; + +/** Main program entry point. This routine contains the overall program flow, including initial + * setup of all components and the main program loop. + */ +int main(void) +{ + SetupHardware(); + + LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); + sei(); + + for (;;) + { + USB_Audio_Task(); + USB_USBTask(); + } +} + +/** Configures the board hardware and chip peripherals for the demo's functionality. */ +void SetupHardware(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(); + USB_Init(); +} + +/** 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. + */ +void EVENT_USB_Device_Connect(void) +{ + /* Indicate USB enumerating */ + LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING); + + /* Sample reload timer initialization */ + OCR0A = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1; + TCCR0A = (1 << WGM01); // CTC mode + TCCR0B = (1 << CS01); // Fcpu/8 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 */ + TCCR3A = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0) + | (1 << COM3B1) | (1 << COM3B0)); // Set on match, clear on TOP + TCCR3B = ((1 << WGM32) | (1 << CS30)); // 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. + */ +void EVENT_USB_Device_Disconnect(void) +{ + /* Stop the timers */ + TCCR0B = 0; +#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO)) + TCCR3B = 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 + + /* Indicate streaming audio interface not selected */ + StreamingAudioInterfaceSelected = false; + + /* Indicate USB not ready */ + LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); +} + +/** 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. + */ +void EVENT_USB_Device_ConfigurationChanged(void) +{ + /* Indicate USB connected and ready */ + LEDs_SetAllLEDs(LEDMASK_USB_READY); + + /* Setup audio stream endpoint */ + if (!(Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS, + ENDPOINT_DIR_OUT, AUDIO_STREAM_EPSIZE, + ENDPOINT_BANK_DOUBLE))) + { + LEDs_SetAllLEDs(LEDMASK_USB_ERROR); + } +} + +/** Event handler for the USB_UnhandledControlRequest 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. + */ +void EVENT_USB_Device_UnhandledControlRequest(void) +{ + /* Process General and Audio specific control requests */ + switch (USB_ControlRequest.bRequest) + { + case REQ_SetInterface: + /* Set Interface is not handled by the library, as its function is application-specific */ + if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE)) + { + Endpoint_ClearSETUP(); + + /* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */ + StreamingAudioInterfaceSelected = ((USB_ControlRequest.wValue) != 0); + + Endpoint_ClearStatusStage(); + } + + break; + } +} + +/** Task to manage the Audio interface, reading in audio samples from the host, and outputting them to the speakers/LEDs as + * desired. + */ +void USB_Audio_Task(void) +{ + /* Device must be connected and configured for the task to run */ + if (USB_DeviceState != DEVICE_STATE_Configured) + return; + + /* Check to see if the streaming interface is selected, if not the host is not receiving audio */ + if (!(StreamingAudioInterfaceSelected)) + return; + + /* 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_IsOUTReceived() && (TIFR0 & (1 << OCF0A))) + { + /* Clear the sample reload timer */ + TIFR0 |= (1 << OCF0A); + + /* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */ + int8_t LeftSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8); + int8_t RightSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8); + + /* 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); + + /* Check to see if the bank is now empty */ + if (!(Endpoint_IsReadWriteAllowed())) + { + /* Acknowledge the packet, clear the bank ready for the next packet */ + Endpoint_ClearOUT(); + } + +#if defined(AUDIO_OUT_MONO) + /* Load the sample into the PWM timer channel */ + OCR3A = (MixedSample_8Bit ^ (1 << 7)); +#elif defined(AUDIO_OUT_STEREO) + /* Load the dual 8-bit samples into the PWM timer channels */ + OCR3A = (LeftSample_8Bit ^ (1 << 7)); + OCR3B = (RightSample_8Bit ^ (1 << 7)); +#elif defined(AUDIO_OUT_PORTC) + /* Load the 8-bit mixed sample into PORTC */ + PORTC = MixedSample_8Bit; +#endif + + uint8_t LEDMask = LEDS_NO_LEDS; + + /* Turn on LEDs as the sample amplitude increases */ + if (MixedSample_8Bit > 16) + LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4); + else if (MixedSample_8Bit > 8) + LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3); + else if (MixedSample_8Bit > 4) + LEDMask = (LEDS_LED1 | LEDS_LED2); + else if (MixedSample_8Bit > 2) + LEDMask = (LEDS_LED1); + + LEDs_SetAllLEDs(LEDMask); + } +}