CDC.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)

#define  INCLUDE_FROM_CDC_CLASS_DEVICE_C
#include "CDC.h"

void CDC_Device_Event_Stub(void)
{

}

void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
{
	if (!(Endpoint_IsSETUPReceived()))
	  return;
	  
	if (USB_ControlRequest.wIndex != CDCInterfaceInfo->Config.ControlInterfaceNumber)
	  return;

	switch (USB_ControlRequest.bRequest)
	{
		case REQ_GetLineEncoding:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				Endpoint_Write_Control_Stream_LE(&CDCInterfaceInfo->State.LineEncoding, sizeof(CDCInterfaceInfo->State.LineEncoding));
				Endpoint_ClearOUT();
			}
			
			break;
		case REQ_SetLineEncoding:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				Endpoint_Read_Control_Stream_LE(&CDCInterfaceInfo->State.LineEncoding, sizeof(CDCInterfaceInfo->State.LineEncoding));
				Endpoint_ClearIN();

				EVENT_CDC_Device_LineEncodingChanged(CDCInterfaceInfo);
			}
	
			break;
		case REQ_SetControlLineState:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{				
				Endpoint_ClearSETUP();
				
				CDCInterfaceInfo->State.ControlLineStates.HostToDevice = USB_ControlRequest.wValue;
				
				EVENT_CDC_Device_ControLineStateChanged(CDCInterfaceInfo);

				Endpoint_ClearStatusStage();
			}
	
			break;
	}
}

bool CDC_Device_ConfigureEndpoints(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
{
	memset(&CDCInterfaceInfo->State, 0x00, sizeof(CDCInterfaceInfo->State));

	if (!(Endpoint_ConfigureEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber, EP_TYPE_BULK,
							         ENDPOINT_DIR_IN, CDCInterfaceInfo->Config.DataINEndpointSize,
							         CDCInterfaceInfo->Config.DataINEndpointDoubleBank ? ENDPOINT_BANK_DOUBLE : ENDPOINT_BANK_SINGLE)))
	{
		return false;
	}

	if (!(Endpoint_ConfigureEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber, EP_TYPE_BULK,
	                                 ENDPOINT_DIR_OUT, CDCInterfaceInfo->Config.DataOUTEndpointSize,
	                                 CDCInterfaceInfo->Config.DataOUTEndpointDoubleBank ? ENDPOINT_BANK_DOUBLE : ENDPOINT_BANK_SINGLE)))
	{
		return false;
	}

	if (!(Endpoint_ConfigureEndpoint(CDCInterfaceInfo->Config.NotificationEndpointNumber, EP_TYPE_INTERRUPT,
	                                 ENDPOINT_DIR_IN, CDCInterfaceInfo->Config.NotificationEndpointSize,
	                                 CDCInterfaceInfo->Config.NotificationEndpointDoubleBank ? ENDPOINT_BANK_DOUBLE : ENDPOINT_BANK_SINGLE)))
	{
		return false;
	}

	return true;
}

void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
	  return;

	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber);

	if (Endpoint_IsOUTReceived() && !(Endpoint_BytesInEndpoint()))
	  Endpoint_ClearOUT();
	  
	CDC_Device_Flush(CDCInterfaceInfo);
}

uint8_t CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
	  return ENDPOINT_RWSTREAM_DeviceDisconnected;
	
	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);
	return Endpoint_Write_Stream_LE(Data, Length, NO_STREAM_CALLBACK);
}

uint8_t CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Data)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
	  return ENDPOINT_RWSTREAM_DeviceDisconnected;

	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);

	if (!(Endpoint_IsReadWriteAllowed()))
	{	
		Endpoint_ClearIN();

		uint8_t ErrorCode;

		if ((ErrorCode = Endpoint_WaitUntilReady()) != ENDPOINT_READYWAIT_NoError)
		  return ErrorCode;
	}

	Endpoint_Write_Byte(Data);
	return ENDPOINT_READYWAIT_NoError;
}

uint8_t CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
	  return ENDPOINT_RWSTREAM_DeviceDisconnected;

	uint8_t ErrorCode;

	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataINEndpointNumber);

	if (!(Endpoint_BytesInEndpoint()))
	  return ENDPOINT_READYWAIT_NoError;
	
	bool BankFull = !(Endpoint_IsReadWriteAllowed());
	
	Endpoint_ClearIN();
	
	if (BankFull)
	{
		if ((ErrorCode = Endpoint_WaitUntilReady()) != ENDPOINT_READYWAIT_NoError)
		  return ErrorCode;

		Endpoint_ClearIN();
	}
	
	return ENDPOINT_READYWAIT_NoError;
}

uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
	  return 0;

	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber);

	if (Endpoint_IsOUTReceived() && !(Endpoint_BytesInEndpoint()))
	  Endpoint_ClearOUT();

	return Endpoint_BytesInEndpoint();
}

uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
	  return 0;

	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.DataOUTEndpointNumber);
	
	uint8_t DataByte = Endpoint_Read_Byte();
	
	if (!(Endpoint_BytesInEndpoint()))
	  Endpoint_ClearOUT();
	  
	return DataByte;
}

void CDC_Device_SendControlLineStateChange(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
	if ((USB_DeviceState != DEVICE_STATE_Configured) || !(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS))
	  return;

	Endpoint_SelectEndpoint(CDCInterfaceInfo->Config.NotificationEndpointNumber);
	
	USB_Request_Header_t Notification = (USB_Request_Header_t)
		{
			.bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
			.bRequest      = NOTIF_SerialState,
			.wValue        = 0,
			.wIndex        = 0,
			.wLength       = sizeof(CDCInterfaceInfo->State.ControlLineStates.DeviceToHost),
		};

	Endpoint_Write_Stream_LE(&Notification, sizeof(USB_Request_Header_t), NO_STREAM_CALLBACK);
	Endpoint_Write_Stream_LE(&CDCInterfaceInfo->State.ControlLineStates.DeviceToHost,
	                         sizeof(CDCInterfaceInfo->State.ControlLineStates.DeviceToHost),
	                         NO_STREAM_CALLBACK);
	Endpoint_ClearIN();
}

void CDC_Device_CreateStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream)
{
	*Stream = (FILE)FDEV_SETUP_STREAM(CDC_Device_putchar, CDC_Device_getchar, _FDEV_SETUP_RW);
	fdev_set_udata(Stream, CDCInterfaceInfo);
}

void CDC_Device_CreateBlockingStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream)
{
	*Stream = (FILE)FDEV_SETUP_STREAM(CDC_Device_putchar, CDC_Device_getchar_Blocking, _FDEV_SETUP_RW);
	fdev_set_udata(Stream, CDCInterfaceInfo);
}

static int CDC_Device_putchar(char c, FILE* Stream)
{
	return CDC_Device_SendByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream), c) ? _FDEV_ERR : 0;
}

static int CDC_Device_getchar(FILE* Stream)
{
	if (!(CDC_Device_BytesReceived((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream))))
	  return _FDEV_EOF;

	return CDC_Device_ReceiveByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
}

static int CDC_Device_getchar_Blocking(FILE* Stream)
{
	while (!(CDC_Device_BytesReceived((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream))))
	{
		CDC_Device_USBTask((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
		USB_USBTask();
	}

	return CDC_Device_ReceiveByte((USB_ClassInfo_CDC_Device_t*)fdev_get_udata(Stream));
}

#endif