-/*\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 AudioOutput demo. This file contains the main tasks of\r
- * the demo and is responsible for the initial application hardware configuration.\r
- */\r
-\r
-#include "AudioOutput.h"\r
-\r
-/** LUFA Audio Class driver interface configuration and state information. This structure is\r
- * passed to all Audio Class driver functions, so that multiple instances of the same class\r
- * within a device can be differentiated from one another.\r
- */\r
-USB_ClassInfo_Audio_Device_t Speaker_Audio_Interface =\r
- {\r
- .Config =\r
- {\r
- .StreamingInterfaceNumber = 1,\r
-\r
- .DataOUTEndpointNumber = AUDIO_STREAM_EPNUM,\r
- .DataOUTEndpointSize = AUDIO_STREAM_EPSIZE,\r
- },\r
- };\r
-\r
-/** Main program entry point. This routine contains the overall program flow, including initial\r
- * setup of all components and the main program loop.\r
- */\r
-int main(void)\r
-{\r
- SetupHardware();\r
-\r
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
- \r
- for (;;)\r
- {\r
- ProcessNextSample();\r
-\r
- Audio_Device_USBTask(&Speaker_Audio_Interface);\r
- USB_USBTask();\r
- }\r
-}\r
-\r
-/** Configures the board hardware and chip peripherals for the demo's functionality. */\r
-void SetupHardware(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
- USB_Init();\r
-}\r
-\r
-/** Processes the next audio sample by reading the last ADC conversion and writing it to the audio\r
- * interface, each time the sample reload timer period elapses to give a constant sample rate.\r
- */\r
-void ProcessNextSample(void)\r
-{\r
- /* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */\r
- if ((TIFR0 & (1 << OCF0A)) && Audio_Device_IsSampleReceived(&Speaker_Audio_Interface))\r
- {\r
- /* Clear the sample reload timer */\r
- TIFR0 |= (1 << OCF0A);\r
-\r
- /* Retrieve the signed 16-bit left and right audio samples */\r
- int16_t LeftSample_16Bit = Audio_Device_ReadSample16(&Speaker_Audio_Interface);\r
- int16_t RightSample_16Bit = Audio_Device_ReadSample16(&Speaker_Audio_Interface);\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_STEREO)\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
-#endif\r
-\r
-#if defined(AUDIO_OUT_MONO)\r
- /* Load the sample into the PWM timer channel */\r
- OCR3A = ((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
- OCR3A = ((uint8_t)LeftSample_8Bit ^ (1 << 7));\r
- OCR3B = ((uint8_t)RightSample_8Bit ^ (1 << 7));\r
-#elif defined(AUDIO_OUT_PORTC)\r
- /* Load the 8-bit mixed sample into PORTC */\r
- PORTC = MixedSample_8Bit;\r
-#else\r
- uint8_t LEDMask = LEDS_NO_LEDS;\r
-\r
- /* Make mixed sample value positive (absolute) */\r
- MixedSample_8Bit = abs(MixedSample_8Bit);\r
-\r
- if (MixedSample_8Bit > 2)\r
- LEDMask |= LEDS_LED1;\r
- \r
- if (MixedSample_8Bit > 4)\r
- LEDMask |= LEDS_LED2;\r
- \r
- if (MixedSample_8Bit > 8)\r
- LEDMask |= LEDS_LED3;\r
-\r
- if (MixedSample_8Bit > 16)\r
- LEDMask |= LEDS_LED4;\r
-\r
- LEDs_SetAllLEDs(LEDMask);\r
-#endif\r
- }\r
-}\r
-\r
-/** Event handler for the library USB Connection event. */\r
-void EVENT_USB_Connect(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);\r
- \r
- /* Sample reload timer initialization */\r
- OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1;\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
- TCCR3A = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)\r
- | (1 << COM3B1) | (1 << COM3B0)); // Set on match, clear on TOP\r
- TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, Fcpu speed\r
-#endif\r
-}\r
-\r
-/** Event handler for the library USB Disconnection event. */\r
-void EVENT_USB_Disconnect(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
-\r
- /* Stop the sample reload timer */\r
- TCCR0B = 0;\r
-\r
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))\r
- /* Stop the PWM generation timer */\r
- TCCR3B = 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
-\r
-/** Event handler for the library USB Configuration Changed event. */\r
-void EVENT_USB_ConfigurationChanged(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_READY);\r
- \r
- if (!(Audio_Device_ConfigureEndpoints(&Speaker_Audio_Interface)))\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
-}\r
-\r
-/** Event handler for the library USB Unhandled Control Packet event. */\r
-void EVENT_USB_UnhandledControlPacket(void)\r
-{\r
- Audio_Device_ProcessControlPacket(&Speaker_Audio_Interface);\r
-}\r
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2010.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ 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"
+
+/** LUFA Audio Class driver interface configuration and state information. This structure is
+ * passed to all Audio Class driver functions, so that multiple instances of the same class
+ * within a device can be differentiated from one another.
+ */
+USB_ClassInfo_Audio_Device_t Speaker_Audio_Interface =
+ {
+ .Config =
+ {
+ .StreamingInterfaceNumber = 1,
+
+ .DataOUTEndpointNumber = AUDIO_STREAM_EPNUM,
+ .DataOUTEndpointSize = AUDIO_STREAM_EPSIZE,
+ },
+ };
+
+/** 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 (;;)
+ {
+ Audio_Device_USBTask(&Speaker_Audio_Interface);
+ 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();
+}
+
+/** ISR to handle the reloading of the PWM timer with the next sample. */
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)
+{
+ uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();
+
+ if (Audio_Device_IsSampleReceived(&Speaker_Audio_Interface))
+ {
+ /* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */
+ int8_t LeftSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8);
+ int8_t RightSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 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);
+
+ #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);
+ }
+
+ Endpoint_SelectEndpoint(PrevEndpoint);
+}
+
+/** Event handler for the library USB Connection event. */
+void EVENT_USB_Device_Connect(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+
+ /* Sample reload timer initialization */
+ TIMSK0 = (1 << OCIE0A);
+ 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, F_CPU speed
+ #endif
+}
+
+/** Event handler for the library USB Disconnection event. */
+void EVENT_USB_Device_Disconnect(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+
+ /* Stop the sample reload timer */
+ TCCR0B = 0;
+
+ #if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
+ /* Stop the PWM generation timer */
+ 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
+}
+
+/** Event handler for the library USB Configuration Changed event. */
+void EVENT_USB_Device_ConfigurationChanged(void)
+{
+ bool ConfigSuccess = true;
+
+ ConfigSuccess &= Audio_Device_ConfigureEndpoints(&Speaker_Audio_Interface);
+
+ LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
+}
+
+/** Event handler for the library USB Control Request reception event. */
+void EVENT_USB_Device_ControlRequest(void)
+{
+ Audio_Device_ProcessControlRequest(&Speaker_Audio_Interface);
+}
+
projects / pub / USBasp.git / blobdiff