/*
               LUFA Library
       Copyright (C) Dean Camera, 2019.
  
    dean [at] fourwalledcubicle [dot] com
             www.lufa-lib.org
  */
  
  /*
    Copyright 2019  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  
    Permission to use, copy, modify, distribute, and sell this
    software and its documentation for any purpose is hereby granted
    without fee, 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 disclaims 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.
  */
  
  /** \file
   *
   *  Main source file for the VirtualSerialHost demo. This file contains the main tasks of
   *  the demo and is responsible for the initial application hardware configuration.
   */
  
  #include "VirtualSerialHost.h"
  
  /** Main program entry point. This routine configures the hardware required by the application, then
   *  enters a loop to run the application tasks in sequence.
   */
  int main(void)
  {
  	SetupHardware();
  
  	puts_P(PSTR(ESC_FG_CYAN "CDC Host Demo running.\r\n" ESC_FG_WHITE));
  
  	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  	GlobalInterruptEnable();
  
  	for (;;)
  	{
  		CDCHost_Task();
  
  		USB_USBTask();
  	}
  }
  
  /** Configures the board hardware and chip peripherals for the demo's functionality. */
  void SetupHardware(void)
  {
  #if (ARCH == ARCH_AVR8)
  	/* Disable watchdog if enabled by bootloader/fuses */
  	MCUSR &= ~(1 << WDRF);
  	wdt_disable();
  
  	/* Disable clock division */
  	clock_prescale_set(clock_div_1);
  #endif
  
  	/* Hardware Initialization */
  	Serial_Init(9600, false);
  	LEDs_Init();
  	USB_Init();
  
  	/* Create a stdio stream for the serial port for stdin and stdout */
  	Serial_CreateStream(NULL);
  }
  
  /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
   *  starts the library USB task to begin the enumeration and USB management process.
   */
  void EVENT_USB_Host_DeviceAttached(void)
  {
  	puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
  	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  }
  
  /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
   *  stops the library USB task management process.
   */
  void EVENT_USB_Host_DeviceUnattached(void)
  {
  	puts_P(PSTR(ESC_FG_GREEN "\r\nDevice Unattached.\r\n" ESC_FG_WHITE));
  	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  }
  
  /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
   *  enumerated by the host and is now ready to be used by the application.
   */
  void EVENT_USB_Host_DeviceEnumerationComplete(void)
  {
  	puts_P(PSTR("Getting Config Data.\r\n"));
  
  	uint8_t ErrorCode;
  
  	/* Get and process the configuration descriptor data */
  	if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
  	{
  		if (ErrorCode == ControlError)
  		  puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
  		else
  		  puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
  
  		printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
  
  		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  		return;
  	}
  
  	/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
  	if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
  	{
  		printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
  		                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
  
  		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  		return;
  	}
  
  	CDC_LineEncoding_t LineEncoding = { .BaudRateBPS = 9600,
  	                                    .CharFormat  = CDC_LINEENCODING_OneStopBit,
  	                                    .ParityType  = CDC_PARITY_None,
  	                                    .DataBits    = 8                            };
  
  	USB_ControlRequest = (USB_Request_Header_t)
  	{
  		.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
  		.bRequest      = CDC_REQ_SetLineEncoding,
  		.wValue        = 0,
  		.wIndex        = 0,
  		.wLength       = sizeof(LineEncoding),
  	};
  
  	/* Set the Line Encoding of the CDC interface within the device, so that it is ready to accept data */
  	Pipe_SelectPipe(PIPE_CONTROLPIPE);
  	if (USB_Host_SendControlRequest(&LineEncoding) != HOST_SENDCONTROL_Successful)
  	{
  		printf_P(PSTR(ESC_FG_RED "Control Error (Set Line Encoding).\r\n"
  		                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
  
  		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  		return;
  	}
  
  	puts_P(PSTR("CDC Device Enumerated.\r\n"));
  	LEDs_SetAllLEDs(LEDMASK_USB_READY);
  }
  
  /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
  void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
  {
  	USB_Disable();
  
  	printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
  	                         " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
  
  	LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  	for(;;);
  }
  
  /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
   *  enumerating an attached USB device.
   */
  void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
                                              const uint8_t SubErrorCode)
  {
  	printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
  	                         " -- Error Code %d\r\n"
  	                         " -- Sub Error Code %d\r\n"
  	                         " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
  
  	LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  }
  
  /** Task to read in data received from the attached CDC device and print it to the serial port.
   */
  void CDCHost_Task(void)
  {
  	if (USB_HostState != HOST_STATE_Configured)
  	  return;
  
  	/* Select the data IN pipe */
  	Pipe_SelectPipe(CDC_DATA_IN_PIPE);
  	Pipe_Unfreeze();
  
  	/* Check to see if a packet has been received */
  	if (Pipe_IsINReceived())
  	{
  		/* Re-freeze IN pipe after the packet has been received */
  		Pipe_Freeze();
  
  		/* Check if data is in the pipe */
  		if (Pipe_IsReadWriteAllowed())
  		{
  			/* Get the length of the pipe data, and create a new buffer to hold it */
  			uint16_t BufferLength = Pipe_BytesInPipe();
  			uint8_t  Buffer[BufferLength];
  
  			/* Read in the pipe data to the temporary buffer */
  			Pipe_Read_Stream_LE(Buffer, BufferLength, NULL);
  
  			/* Print out the buffer contents to the USART */
  			for (uint16_t BufferByte = 0; BufferByte < BufferLength; BufferByte++)
  			  putchar(Buffer[BufferByte]);
  		}
  
  		/* Clear the pipe after it is read, ready for the next packet */
  		Pipe_ClearIN();
  	}
  
  	/* Re-freeze IN pipe after use */
  	Pipe_Freeze();
  
  	/* Select and unfreeze the notification pipe */
  	Pipe_SelectPipe(CDC_NOTIFICATION_PIPE);
  	Pipe_Unfreeze();
  
  	/* Check if a packet has been received */
  	if (Pipe_IsINReceived())
  	{
  		/* Discard the unused event notification */
  		Pipe_ClearIN();
  	}
  
  	/* Freeze notification IN pipe after use */
  	Pipe_Freeze();
  }