+++ /dev/null
-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2009.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\r
- Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, and distribute this software\r
- and its documentation for any purpose and without fee is hereby\r
- granted, provided that the above copyright notice appear in all\r
- copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting\r
- documentation, and that the name of the author not be used in\r
- advertising or publicity pertaining to distribution of the\r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-/** \file\r
- *\r
- * Main source file for the Audio Output demo. This file contains the main tasks of the demo and\r
- * is responsible for the initial application hardware configuration.\r
- */\r
- \r
-#include "AudioOutput.h"\r
-\r
-/* Project Tags, for reading out using the ButtLoad project */\r
-BUTTLOADTAG(ProjName, "LUFA AudioOut App");\r
-BUTTLOADTAG(BuildTime, __TIME__);\r
-BUTTLOADTAG(BuildDate, __DATE__);\r
-BUTTLOADTAG(LUFAVersion, "LUFA V" LUFA_VERSION_STRING);\r
-\r
-/* Scheduler Task List */\r
-TASK_LIST\r
-{\r
- { Task: USB_USBTask , TaskStatus: TASK_STOP },\r
- { Task: USB_Audio_Task , TaskStatus: TASK_STOP },\r
-};\r
-\r
-\r
-/** Main program entry point. This routine configures the hardware required by the application, then\r
- * starts the scheduler to run the application tasks.\r
- */\r
-int main(void)\r
-{\r
- /* Disable watchdog if enabled by bootloader/fuses */\r
- MCUSR &= ~(1 << WDRF);\r
- wdt_disable();\r
-\r
- /* Disable clock division */\r
- clock_prescale_set(clock_div_1);\r
-\r
- /* Hardware Initialization */\r
- LEDs_Init();\r
- \r
- /* Indicate USB not ready */\r
- UpdateStatus(Status_USBNotReady);\r
- \r
- /* Initialize Scheduler so that it can be used */\r
- Scheduler_Init();\r
-\r
- /* Initialize USB Subsystem */\r
- USB_Init();\r
-\r
- /* Scheduling - routine never returns, so put this last in the main function */\r
- Scheduler_Start();\r
-}\r
-\r
-/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs, and\r
- * configures the sample update and PWM timers.\r
- */\r
-EVENT_HANDLER(USB_Connect)\r
-{\r
- /* Start USB management task */\r
- Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);\r
-\r
- /* Indicate USB enumerating */\r
- UpdateStatus(Status_USBEnumerating);\r
- \r
- /* Sample reload timer initialization */\r
- OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY);\r
- TCCR0A = (1 << WGM01); // CTC mode\r
- TCCR0B = (1 << CS00); // Fcpu speed\r
- \r
-#if defined(AUDIO_OUT_MONO)\r
- /* Set speaker as output */\r
- DDRC |= (1 << 6);\r
-#elif defined(AUDIO_OUT_STEREO)\r
- /* Set speakers as outputs */\r
- DDRC |= ((1 << 6) | (1 << 5));\r
-#elif defined(AUDIO_OUT_PORTC)\r
- /* Set PORTC as outputs */\r
- DDRC |= 0xFF;\r
-#endif\r
-\r
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))\r
- /* PWM speaker timer initialization */\r
- TCCRxA = ((1 << WGMx0) | (1 << COMxA1) | (1 << COMxA0)\r
- | (1 << COMxB1) | (1 << COMxB0)); // Set on match, clear on TOP\r
- TCCRxB = ((1 << WGMx2) | (1 << CSx0)); // Fast 8-Bit PWM, Fcpu speed\r
-#endif \r
-}\r
-\r
-/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via\r
- * the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.\r
- */\r
-EVENT_HANDLER(USB_Disconnect)\r
-{\r
- /* Stop the timers */\r
- TCCR0B = 0;\r
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))\r
- TCCRxB = 0;\r
-#endif \r
-\r
-#if defined(AUDIO_OUT_MONO)\r
- /* Set speaker as input to reduce current draw */\r
- DDRC &= ~(1 << 6);\r
-#elif defined(AUDIO_OUT_STEREO)\r
- /* Set speakers as inputs to reduce current draw */\r
- DDRC &= ~((1 << 6) | (1 << 5));\r
-#elif defined(AUDIO_OUT_PORTC)\r
- /* Set PORTC low */\r
- PORTC = 0x00;\r
-#endif\r
-\r
- /* Stop running audio and USB management tasks */\r
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP);\r
- Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);\r
-\r
- /* Indicate USB not ready */\r
- UpdateStatus(Status_USBNotReady);\r
-}\r
-\r
-/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration\r
- * of the USB device after enumeration - the device endpoints are configured.\r
- */\r
-EVENT_HANDLER(USB_ConfigurationChanged)\r
-{\r
- /* Setup audio stream endpoint */\r
- Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS,\r
- ENDPOINT_DIR_OUT, AUDIO_STREAM_EPSIZE,\r
- ENDPOINT_BANK_DOUBLE);\r
-\r
- /* Indicate USB connected and ready */\r
- UpdateStatus(Status_USBReady);\r
-}\r
-\r
-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific\r
- * control requests that are not handled internally by the USB library (including the Audio class-specific\r
- * requests) so that they can be handled appropriately for the application.\r
- */\r
-EVENT_HANDLER(USB_UnhandledControlPacket)\r
-{\r
- /* Process General and Audio specific control requests */\r
- switch (bRequest)\r
- {\r
- case REQ_SetInterface:\r
- /* Set Interface is not handled by the library, as its function is application-specific */\r
- if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))\r
- {\r
- uint16_t wValue = Endpoint_Read_Word_LE();\r
- \r
- Endpoint_ClearSetupReceived();\r
- \r
- /* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */\r
- if (wValue)\r
- {\r
- /* Start audio task */\r
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_RUN);\r
- }\r
- else\r
- {\r
- /* Stop audio task */\r
- Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP); \r
- }\r
- \r
- /* Acknowledge status stage */\r
- while (!(Endpoint_IsSetupINReady()));\r
- Endpoint_ClearSetupIN();\r
- }\r
-\r
- break;\r
- }\r
-}\r
-\r
-/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to\r
- * log to a serial port, or anything else that is suitable for status updates.\r
- *\r
- * \param CurrentStatus Current status of the system, from the AudioOutput_StatusCodes_t enum\r
- */\r
-void UpdateStatus(uint8_t CurrentStatus)\r
-{\r
- uint8_t LEDMask = LEDS_NO_LEDS;\r
- \r
- /* Set the LED mask to the appropriate LED mask based on the given status code */\r
- switch (CurrentStatus)\r
- {\r
- case Status_USBNotReady:\r
- LEDMask = (LEDS_LED1);\r
- break;\r
- case Status_USBEnumerating:\r
- LEDMask = (LEDS_LED1 | LEDS_LED2);\r
- break;\r
- case Status_USBReady:\r
- LEDMask = (LEDS_LED2 | LEDS_LED4);\r
- break;\r
- }\r
- \r
- /* Set the board LEDs to the new LED mask */\r
- LEDs_SetAllLEDs(LEDMask);\r
-}\r
-\r
-/** Task to manage the Audio interface, reading in audio samples from the host, and outputting them to the speakers/LEDs as\r
- * desired.\r
- */\r
-TASK(USB_Audio_Task)\r
-{\r
- /* Select the audio stream endpoint */\r
- Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);\r
- \r
- /* Check if the current endpoint can be read from (contains a packet) and that the next sample should be read */\r
- if (Endpoint_ReadWriteAllowed() && (TIFR0 & (1 << OCF0A)))\r
- {\r
- /* Clear the sample reload timer */\r
- TIFR0 |= (1 << OCF0A);\r
-\r
- /* Retreive the signed 16-bit left and right audio samples */\r
- int16_t LeftSample_16Bit = (int16_t)Endpoint_Read_Word_LE();\r
- int16_t RightSample_16Bit = (int16_t)Endpoint_Read_Word_LE();\r
-\r
- /* Check to see if the bank is now empty */\r
- if (!(Endpoint_ReadWriteAllowed()))\r
- {\r
- /* Acknowledge the packet, clear the bank ready for the next packet */\r
- Endpoint_ClearCurrentBank();\r
- }\r
-\r
- /* Massage signed 16-bit left and right audio samples into signed 8-bit */\r
- int8_t LeftSample_8Bit = (LeftSample_16Bit >> 8);\r
- int8_t RightSample_8Bit = (RightSample_16Bit >> 8);\r
- \r
-#if defined(AUDIO_OUT_MONO)\r
- /* Mix the two channels together to produce a mono, 8-bit sample */\r
- int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);\r
-\r
- /* Load the sample into the PWM timer channel */\r
- OCRxA = ((uint8_t)MixedSample_8Bit ^ (1 << 7));\r
-#elif defined(AUDIO_OUT_STEREO)\r
- /* Load the dual 8-bit samples into the PWM timer channels */\r
- OCRxA = ((uint8_t)LeftSample_8Bit ^ (1 << 7));\r
- OCRxB = ((uint8_t)RightSample_8Bit ^ (1 << 7));\r
-#elif defined(AUDIO_OUT_PORTC)\r
- /* Mix the two channels together to produce a mono, 8-bit sample */\r
- int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);\r
-\r
- PORTC = MixedSample_8Bit;\r
-#else\r
- uint8_t LEDMask = LEDS_NO_LEDS;\r
-\r
- /* Make left channel positive (absolute) */\r
- if (LeftSample_8Bit < 0)\r
- LeftSample_8Bit = -LeftSample_8Bit;\r
-\r
- /* Make right channel positive (absolute) */\r
- if (RightSample_8Bit < 0)\r
- RightSample_8Bit = -RightSample_8Bit;\r
-\r
- /* Set first LED based on sample value */\r
- if (LeftSample_8Bit < ((128 / 8) * 1))\r
- LEDMask |= LEDS_LED2;\r
- else if (LeftSample_8Bit < ((128 / 8) * 3))\r
- LEDMask |= (LEDS_LED1 | LEDS_LED2);\r
- else\r
- LEDMask |= LEDS_LED1;\r
-\r
- /* Set second LED based on sample value */\r
- if (RightSample_8Bit < ((128 / 8) * 1))\r
- LEDMask |= LEDS_LED4;\r
- else if (RightSample_8Bit < ((128 / 8) * 3))\r
- LEDMask |= (LEDS_LED3 | LEDS_LED4);\r
- else\r
- LEDMask |= LEDS_LED3;\r
- \r
- LEDs_SetAllLEDs(LEDMask);\r
-#endif\r
- }\r
-}\r
projects / pub / lufa.git / blobdiff