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_t Speaker_Audio_Interface =\r
{\r
- .InterfaceNumber = 0,\r
+ .StreamingInterfaceNumber = 1,\r
\r
- .DataOUTEndpointNumber = AUDIO_STREAM_EPNUM,\r
- .DataOUTEndpointSize = AUDIO_STREAM_EPSIZE,\r
+ .DataOUTEndpointNumber = AUDIO_STREAM_EPNUM,\r
+ .DataOUTEndpointSize = AUDIO_STREAM_EPSIZE,\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
}\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
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
if ((TIFR0 & (1 << OCF0A)) && USB_Audio_IsSampleReceived(&Speaker_Audio_Interface))\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
+#if defined(AUDIO_OUT_MONO)\r
/* Load the sample into the PWM timer channel */\r
OCRxA = ((uint8_t)MixedSample_8Bit ^ (1 << 7));\r
#elif defined(AUDIO_OUT_STEREO)\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
+ /* Make mixed sample value positive (absolute) */\r
+ if (MixedSample_8Bit < 0)\r
+ MixedSample_8Bit = -MixedSample_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
+ 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
- /* Set second LED based on sample value */\r
- if (RightSample_8Bit < ((128 / 8) * 1))\r
+ if (MixedSample_8Bit > ((128 / 8) * 4))\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
+\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
#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 for the library USB Disconnection event. */\r
void EVENT_USB_Disconnect(void)\r
{\r
LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
\r
- /* Stop the timers */\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
TCCRxB = 0;\r
#endif \r
\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
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
USB_Audio_ProcessControlPacket(&Speaker_Audio_Interface);\r
projects / pub / USBasp.git / blobdiff