Minor documentation page updates.
Redocumented all device demos, now that they have changed over to the new USB class drivers. Added C linkage to class drivers for C++ support. Added prefixes to most of the class driver constants to prevent name clashes.
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Dean Camera
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47 changed files with 653 additions and 153 deletions
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@ -28,16 +28,29 @@
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this software.
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*/
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/** \file
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*
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* Main source file for the AudioOutput demo. This file contains the main tasks of
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* the demo and is responsible for the initial application hardware configuration.
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*/
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#include "AudioOutput.h"
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/** LUFA Audio Class driver interface configuration and state information. This structure is
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* passed to all Audio Class driver functions, so that multiple instances of the same class
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* within a device can be differentiated from one another.
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*/
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USB_ClassInfo_Audio_t Speaker_Audio_Interface =
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{
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.InterfaceNumber = 0,
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.StreamingInterfaceNumber = 1,
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.DataOUTEndpointNumber = AUDIO_STREAM_EPNUM,
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.DataOUTEndpointSize = AUDIO_STREAM_EPSIZE,
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.DataOUTEndpointNumber = AUDIO_STREAM_EPNUM,
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.DataOUTEndpointSize = AUDIO_STREAM_EPSIZE,
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};
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/** Main program entry point. This routine contains the overall program flow, including initial
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* setup of all components and the main program loop.
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*/
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int main(void)
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{
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SetupHardware();
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@ -53,6 +66,7 @@ int main(void)
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}
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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@ -67,6 +81,9 @@ void SetupHardware(void)
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USB_Init();
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}
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/** Processes the next audio sample by reading the last ADC conversion and writing it to the audio
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* interface, each time the sample reload timer period elapses to give a constant sample rate.
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*/
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void ProcessNextSample(void)
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{
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if ((TIFR0 & (1 << OCF0A)) && USB_Audio_IsSampleReceived(&Speaker_Audio_Interface))
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@ -82,10 +99,10 @@ void ProcessNextSample(void)
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int8_t LeftSample_8Bit = (LeftSample_16Bit >> 8);
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int8_t RightSample_8Bit = (RightSample_16Bit >> 8);
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#if defined(AUDIO_OUT_MONO)
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/* Mix the two channels together to produce a mono, 8-bit sample */
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int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);
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#if defined(AUDIO_OUT_MONO)
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/* Load the sample into the PWM timer channel */
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OCRxA = ((uint8_t)MixedSample_8Bit ^ (1 << 7));
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#elif defined(AUDIO_OUT_STEREO)
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@ -93,42 +110,32 @@ void ProcessNextSample(void)
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OCRxA = ((uint8_t)LeftSample_8Bit ^ (1 << 7));
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OCRxB = ((uint8_t)RightSample_8Bit ^ (1 << 7));
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#elif defined(AUDIO_OUT_PORTC)
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/* Mix the two channels together to produce a mono, 8-bit sample */
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int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);
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PORTC = MixedSample_8Bit;
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#else
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uint8_t LEDMask = LEDS_NO_LEDS;
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/* Make left channel positive (absolute) */
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if (LeftSample_8Bit < 0)
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LeftSample_8Bit = -LeftSample_8Bit;
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/* Make mixed sample value positive (absolute) */
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if (MixedSample_8Bit < 0)
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MixedSample_8Bit = -MixedSample_8Bit;
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/* Make right channel positive (absolute) */
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if (RightSample_8Bit < 0)
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RightSample_8Bit = -RightSample_8Bit;
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/* Set first LED based on sample value */
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if (LeftSample_8Bit < ((128 / 8) * 1))
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LEDMask |= LEDS_LED2;
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else if (LeftSample_8Bit < ((128 / 8) * 3))
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LEDMask |= (LEDS_LED1 | LEDS_LED2);
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else
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if (MixedSample_8Bit > ((128 / 8) * 1))
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LEDMask |= LEDS_LED1;
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/* Set second LED based on sample value */
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if (RightSample_8Bit < ((128 / 8) * 1))
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LEDMask |= LEDS_LED4;
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else if (RightSample_8Bit < ((128 / 8) * 3))
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LEDMask |= (LEDS_LED3 | LEDS_LED4);
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else
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LEDMask |= LEDS_LED3;
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if (MixedSample_8Bit > ((128 / 8) * 2))
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LEDMask |= LEDS_LED2;
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if (MixedSample_8Bit > ((128 / 8) * 3))
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LEDMask |= LEDS_LED3;
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if (MixedSample_8Bit > ((128 / 8) * 4))
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LEDMask |= LEDS_LED4;
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LEDs_SetAllLEDs(LEDMask);
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#endif
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}
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}
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/** Event handler for the library USB Connection event. */
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void EVENT_USB_Connect(void)
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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@ -157,16 +164,16 @@ void EVENT_USB_Connect(void)
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#endif
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}
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/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
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* the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.
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*/
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/** Event handler for the library USB Disconnection event. */
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void EVENT_USB_Disconnect(void)
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{
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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/* Stop the timers */
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/* Stop the sample reload timer */
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TCCR0B = 0;
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#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
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/* Stop the PWM generation timer */
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TCCRxB = 0;
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#endif
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@ -182,6 +189,7 @@ void EVENT_USB_Disconnect(void)
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#endif
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}
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/** Event handler for the library USB Configuration Changed event. */
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void EVENT_USB_ConfigurationChanged(void)
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{
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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@ -190,6 +198,7 @@ void EVENT_USB_ConfigurationChanged(void)
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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/** Event handler for the library USB Unhandled Control Packet event. */
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void EVENT_USB_UnhandledControlPacket(void)
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{
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USB_Audio_ProcessControlPacket(&Speaker_Audio_Interface);
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