DualCDC.c 11.7 KB
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/*
             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.
*/

/** \file
 *
 *  Main source file for the DualCDC demo. This file contains the main tasks of the demo and
 *  is responsible for the initial application hardware configuration.
 */
 
#include "DualCDC.h"

/** Contains the current baud rate and other settings of the first virtual serial port. While this demo does not use
 *  the physical USART and thus does not use these settings, they must still be retained and returned to the host
 *  upon request or the host will assume the device is non-functional.
 *
 *  These values are set by the host via a class-specific request, however they are not required to be used accurately.
 *  It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
 *  serial link characteristics and instead sends and receives data in endpoint streams.
 */
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CDC_Line_Coding_t LineEncoding1 = { .BaudRateBPS = 0,
                                    .CharFormat  = OneStopBit,
                                    .ParityType  = Parity_None,
                                    .DataBits    = 8            };
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/** Contains the current baud rate and other settings of the second virtual serial port. While this demo does not use
 *  the physical USART and thus does not use these settings, they must still be retained and returned to the host
 *  upon request or the host will assume the device is non-functional.
 *
 *  These values are set by the host via a class-specific request, however they are not required to be used accurately.
 *  It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
 *  serial link characteristics and instead sends and receives data in endpoint streams.
 */
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CDC_Line_Coding_t LineEncoding2 = { .BaudRateBPS = 0,
                                    .CharFormat  = OneStopBit,
                                    .ParityType  = Parity_None,
                                    .DataBits    = 8            };
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/** Main program entry point. This routine configures the hardware required by the application, then
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 *  enters a loop to run the application tasks in sequence.
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 */
int main(void)
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{
	SetupHardware();

	for (;;)
	{
		CDC1_Task();
		CDC2_Task();
		USB_USBTask();
	}
}

/** Configures the board hardware and chip peripherals for the demo's functionality. */
void SetupHardware(void)
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{
	/* Disable watchdog if enabled by bootloader/fuses */
	MCUSR &= ~(1 << WDRF);
	wdt_disable();

	/* Disable clock division */
	clock_prescale_set(clock_div_1);

	/* Hardware Initialization */
	Joystick_Init();
	LEDs_Init();
	USB_Init();
}

/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
 *  starts the library USB task to begin the enumeration and USB management process.
 */
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void EVENT_USB_Device_Connect(void)
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{
	/* Indicate USB enumerating */
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	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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}

/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
 *  the status LEDs and stops the USB management and CDC management tasks.
 */
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void EVENT_USB_Device_Disconnect(void)
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{
	/* Indicate USB not ready */
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	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}

/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
 *  of the USB device after enumeration - the device endpoints are configured and the CDC management tasks are started.
 */
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void EVENT_USB_Device_ConfigurationChanged(void)
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{							   
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	/* Indicate USB connected and ready */
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	LEDs_SetAllLEDs(LEDMASK_USB_READY);
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	/* Setup CDC Notification, Rx and Tx Endpoints for the first CDC */
	if (!(Endpoint_ConfigureEndpoint(CDC1_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
		                             ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	}
	
	if (!(Endpoint_ConfigureEndpoint(CDC1_TX_EPNUM, EP_TYPE_BULK,
		                             ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	}
	
	if (!(Endpoint_ConfigureEndpoint(CDC1_RX_EPNUM, EP_TYPE_BULK,
		                             ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	}
	
	/* Setup CDC Notification, Rx and Tx Endpoints for the second CDC */
	if (!(Endpoint_ConfigureEndpoint(CDC2_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
		                             ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	}
	
	if (!(Endpoint_ConfigureEndpoint(CDC2_TX_EPNUM, EP_TYPE_BULK,
		                             ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	}
	
	if (!(Endpoint_ConfigureEndpoint(CDC2_RX_EPNUM, EP_TYPE_BULK,
		                             ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
	                                 ENDPOINT_BANK_SINGLE)))
	{
		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
	}
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	/* Reset line encoding baud rates so that the host knows to send new values */
	LineEncoding1.BaudRateBPS = 0;
	LineEncoding2.BaudRateBPS = 0;
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}

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/** Event handler for the USB_UnhandledControlRequest event. This is used to catch standard and class specific
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 *  control requests that are not handled internally by the USB library (including the CDC control commands,
 *  which are all issued via the control endpoint), so that they can be handled appropriately for the application.
 */
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void EVENT_USB_Device_UnhandledControlRequest(void)
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{
	/* Determine which interface's Line Coding data is being set from the wIndex parameter */
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	uint8_t* LineEncodingData = (USB_ControlRequest.wIndex == 0) ? (uint8_t*)&LineEncoding1 : (uint8_t*)&LineEncoding2;
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	/* Process CDC specific control requests */
	switch (USB_ControlRequest.bRequest)
	{
		case REQ_GetLineEncoding:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{	
				/* Acknowledge the SETUP packet, ready for data transfer */
				Endpoint_ClearSETUP();

				/* Write the line coding data to the control endpoint */
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				Endpoint_Write_Control_Stream_LE(LineEncodingData, sizeof(CDC_Line_Coding_t));
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				/* Finalize the stream transfer to send the last packet or clear the host abort */
				Endpoint_ClearOUT();
			}
			
			break;
		case REQ_SetLineEncoding:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				/* Acknowledge the SETUP packet, ready for data transfer */
				Endpoint_ClearSETUP();

				/* Read the line coding data in from the host into the global struct */
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				Endpoint_Read_Control_Stream_LE(LineEncodingData, sizeof(CDC_Line_Coding_t));
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				/* Finalize the stream transfer to clear the last packet from the host */
				Endpoint_ClearIN();
			}
	
			break;
		case REQ_SetControlLineState:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				/* Acknowledge the SETUP packet, ready for data transfer */
				Endpoint_ClearSETUP();
				
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				Endpoint_ClearStatusStage();
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			}
	
			break;
	}
}

/** Function to manage CDC data transmission and reception to and from the host for the first CDC interface, which sends joystick
 *  movements to the host as ASCII strings.
 */
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void CDC1_Task(void)
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{
	char*       ReportString    = NULL;
	uint8_t     JoyStatus_LCL   = Joystick_GetStatus();
	static bool ActionSent      = false;
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	/* Device must be connected and configured for the task to run */
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	if (USB_DeviceState != DEVICE_STATE_Configured)
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	  return;

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	/* Determine if a joystick action has occurred */
	if (JoyStatus_LCL & JOY_UP)
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	  ReportString = "Joystick Up\r\n";
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	else if (JoyStatus_LCL & JOY_DOWN)
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	  ReportString = "Joystick Down\r\n";
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	else if (JoyStatus_LCL & JOY_LEFT)
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	  ReportString = "Joystick Left\r\n";
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	else if (JoyStatus_LCL & JOY_RIGHT)
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	  ReportString = "Joystick Right\r\n";
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	else if (JoyStatus_LCL & JOY_PRESS)
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	  ReportString = "Joystick Pressed\r\n";
	else
	  ActionSent = false;
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	/* Flag management - Only allow one string to be sent per action */
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	if ((ReportString != NULL) && (ActionSent == false) && LineEncoding1.BaudRateBPS)
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	{
		ActionSent = true;
		
		/* Select the Serial Tx Endpoint */
		Endpoint_SelectEndpoint(CDC1_TX_EPNUM);

		/* Write the String to the Endpoint */
		Endpoint_Write_Stream_LE(ReportString, strlen(ReportString));
		
		/* Finalize the stream transfer to send the last packet */
		Endpoint_ClearIN();

		/* Wait until the endpoint is ready for another packet */
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		Endpoint_WaitUntilReady();
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		/* Send an empty packet to ensure that the host does not buffer data sent to it */
		Endpoint_ClearIN();
	}

	/* Select the Serial Rx Endpoint */
	Endpoint_SelectEndpoint(CDC1_RX_EPNUM);
	
	/* Throw away any received data from the host */
	if (Endpoint_IsOUTReceived())
	  Endpoint_ClearOUT();
}

/** Function to manage CDC data transmission and reception to and from the host for the second CDC interface, which echoes back
 *  all data sent to it from the host.
 */
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void CDC2_Task(void)
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{
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	/* Device must be connected and configured for the task to run */
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	if (USB_DeviceState != DEVICE_STATE_Configured)
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	  return;

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	/* Select the Serial Rx Endpoint */
	Endpoint_SelectEndpoint(CDC2_RX_EPNUM);
	
	/* Check to see if any data has been received */
	if (Endpoint_IsOUTReceived())
	{
		/* Create a temp buffer big enough to hold the incoming endpoint packet */
		uint8_t  Buffer[Endpoint_BytesInEndpoint()];
		
		/* Remember how large the incoming packet is */
		uint16_t DataLength = Endpoint_BytesInEndpoint();
	
		/* Read in the incoming packet into the buffer */
		Endpoint_Read_Stream_LE(&Buffer, DataLength);

		/* Finalize the stream transfer to send the last packet */
		Endpoint_ClearOUT();

		/* Select the Serial Tx Endpoint */
		Endpoint_SelectEndpoint(CDC2_TX_EPNUM);
		
		/* Write the received data to the endpoint */
		Endpoint_Write_Stream_LE(&Buffer, DataLength);

		/* Finalize the stream transfer to send the last packet */
		Endpoint_ClearIN();

		/* Wait until the endpoint is ready for the next packet */
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		Endpoint_WaitUntilReady();
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		/* Send an empty packet to prevent host buffering */
		Endpoint_ClearIN();
	}
}