qmk_firmware/LUFA/Drivers/USB/Class/Device/Audio.c

/*
             LUFA Library
     Copyright (C) Dean Camera, 2009.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, and distribute this software
  and its documentation for any purpose and without fee is hereby
  granted, 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.
*/

#include "../../HighLevel/USBMode.h"
#if defined(USB_CAN_BE_DEVICE)

#include "Audio.h"

void Audio_Device_ProcessControlRequest(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
	if (!(Endpoint_IsSETUPReceived()))
	  return;
	  
	if (USB_ControlRequest.wIndex != AudioInterfaceInfo->Config.StreamingInterfaceNumber)
	  return;

	switch (USB_ControlRequest.bRequest)
	{
		case REQ_SetInterface:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				
				AudioInterfaceInfo->State.InterfaceEnabled = (USB_ControlRequest.wValue != 0);
				  
				Endpoint_ClearStatusStage();
			}

			break;
	}
}

bool Audio_Device_ConfigureEndpoints(USB_ClassInfo_Audio_Device_t* AudioInterfaceInfo)
{
	memset(&AudioInterfaceInfo->State, 0x00, sizeof(AudioInterfaceInfo->State));

	if (AudioInterfaceInfo->Config.DataINEndpointNumber)
	{
		if (!(Endpoint_ConfigureEndpoint(AudioInterfaceInfo->Config.DataINEndpointNumber, EP_TYPE_ISOCHRONOUS,
										 ENDPOINT_DIR_IN, AudioInterfaceInfo->Config.DataINEndpointSize,
										 ENDPOINT_BANK_DOUBLE)))
		{
			return false;
		}
	}

	if (AudioInterfaceInfo->Config.DataOUTEndpointNumber)
	{
		if (!(Endpoint_ConfigureEndpoint(AudioInterfaceInfo->Config.DataOUTEndpointNumber, EP_TYPE_ISOCHRONOUS,
										 ENDPOINT_DIR_OUT, AudioInterfaceInfo->Config.DataOUTEndpointSize,
										 ENDPOINT_BANK_DOUBLE)))
		{
			return false;
		}
	}
	
	return true;
}

void Audio_Device_USBTask(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{

}

int8_t Audio_Device_ReadSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
	int8_t Sample;

	Sample = Endpoint_Read_Byte();

	if (!(Endpoint_BytesInEndpoint()))
	  Endpoint_ClearOUT();
	
	return Sample;
}

int16_t Audio_Device_ReadSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
	int16_t Sample;

	Sample = (int16_t)Endpoint_Read_Word_LE();
		  
	if (!(Endpoint_BytesInEndpoint()))
	  Endpoint_ClearOUT();

	return Sample;
}

int32_t Audio_Device_ReadSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
	int32_t Sample;

	Sample = (((uint32_t)Endpoint_Read_Byte() << 16) | Endpoint_Read_Word_LE());
		  
	if (!(Endpoint_BytesInEndpoint()))
	  Endpoint_ClearOUT();

	return Sample;
}

void Audio_Device_WriteSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, const int8_t Sample)
{
	Endpoint_Write_Byte(Sample);

	if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize)
	  Endpoint_ClearIN();
}

void Audio_Device_WriteSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, const int16_t Sample)
{
	Endpoint_Write_Word_LE(Sample);

	if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize)
	  Endpoint_ClearIN();
}

void Audio_Device_WriteSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, const int32_t Sample)
{
	Endpoint_Write_Byte(Sample >> 16);
	Endpoint_Write_Word_LE(Sample);

	if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize)
	  Endpoint_ClearIN();
}

bool Audio_Device_IsSampleReceived(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(AudioInterfaceInfo->State.InterfaceEnabled))
	  return false;
	
	Endpoint_SelectEndpoint(AudioInterfaceInfo->Config.DataOUTEndpointNumber);	
	return Endpoint_IsOUTReceived();
}

bool Audio_Device_IsReadyForNextSample(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(AudioInterfaceInfo->State.InterfaceEnabled))
	  return false;
	
	Endpoint_SelectEndpoint(AudioInterfaceInfo->Config.DataINEndpointNumber);
	return Endpoint_IsINReady();
}

#endif