/*\r
LUFA Library\r
- Copyright (C) Dean Camera, 2009.\r
+ Copyright (C) Dean Camera, 2010.\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
+ Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
+\r
+ Permission to use, copy, modify, distribute, and sell this \r
+ software and its documentation for any purpose is hereby granted\r
+ without fee, provided that the above copyright notice appear in \r
+ all 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
\r
/** \file\r
*\r
- * Main source file for the Audio Output demo. This file contains the main tasks of the demo and\r
+ * Main source file for the AudioOutput demo. This file contains the main tasks of the demo and\r
* is responsible for the initial application hardware configuration.\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
-void EVENT_USB_Connect(void)\r
+void EVENT_USB_Device_Connect(void)\r
{\r
/* Indicate USB enumerating */\r
LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);\r
\r
/* Sample reload timer initialization */\r
- OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1;\r
+ OCR0A = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;\r
TCCR0A = (1 << WGM01); // CTC mode\r
- TCCR0B = (1 << CS00); // Fcpu speed\r
+ TCCR0B = (1 << CS01); // Fcpu/8 speed\r
\r
#if defined(AUDIO_OUT_MONO)\r
/* Set speaker as output */\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
-void EVENT_USB_Disconnect(void)\r
+void EVENT_USB_Device_Disconnect(void)\r
{\r
/* Stop the timers */\r
TCCR0B = 0;\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
-void EVENT_USB_ConfigurationChanged(void)\r
+void EVENT_USB_Device_ConfigurationChanged(void)\r
{\r
/* Indicate USB connected and ready */\r
LEDs_SetAllLEDs(LEDMASK_USB_READY);\r
}\r
}\r
\r
-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific\r
+/** Event handler for the USB_UnhandledControlRequest 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
-void EVENT_USB_UnhandledControlPacket(void)\r
+void EVENT_USB_Device_UnhandledControlRequest(void)\r
{\r
/* Process General and Audio specific control requests */\r
switch (USB_ControlRequest.bRequest)\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 = (int16_t)Endpoint_Read_Word_LE();\r
- int16_t RightSample_16Bit = (int16_t)Endpoint_Read_Word_LE();\r
+ /* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */\r
+ int8_t LeftSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8);\r
+ int8_t RightSample_8Bit = ((int16_t)Endpoint_Read_Word_LE() >> 8);\r
+\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
/* Check to see if the bank is now empty */\r
if (!(Endpoint_IsReadWriteAllowed()))\r
Endpoint_ClearOUT();\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
- /* 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
#if defined(AUDIO_OUT_MONO)\r
/* Load the sample into the PWM timer channel */\r
- OCR3A = ((uint8_t)MixedSample_8Bit ^ (1 << 7));\r
+ OCR3A = (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
+ OCR3A = (LeftSample_8Bit ^ (1 << 7));\r
+ OCR3B = (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
+#endif\r
+\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 > ((128 / 8) * 1))\r
- LEDMask |= LEDS_LED1;\r
- \r
- if (MixedSample_8Bit > ((128 / 8) * 2))\r
- LEDMask |= LEDS_LED2;\r
- \r
- if (MixedSample_8Bit > ((128 / 8) * 3))\r
- LEDMask |= LEDS_LED3;\r
-\r
- if (MixedSample_8Bit > ((128 / 8) * 4))\r
- LEDMask |= LEDS_LED4;\r
- \r
+ /* Turn on LEDs as the sample amplitude increases */\r
+ if (MixedSample_8Bit > 16)\r
+ LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4);\r
+ else if (MixedSample_8Bit > 8)\r
+ LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3);\r
+ else if (MixedSample_8Bit > 4)\r
+ LEDMask = (LEDS_LED1 | LEDS_LED2);\r
+ else if (MixedSample_8Bit > 2)\r
+ LEDMask = (LEDS_LED1);\r
+\r
LEDs_SetAllLEDs(LEDMask);\r
-#endif\r
}\r
}\r
projects / pub / USBasp.git / blobdiff