1 files changed, 327 insertions, 0 deletions
diff --git a/Demos/Device/LowLevel/VirtualSerial/CDC.c b/Demos/Device/LowLevel/VirtualSerial/CDC.c
new file mode 100644
index 000000000..444dc019d
--- /dev/null
+++ b/Demos/Device/LowLevel/VirtualSerial/CDC.c
@@ -0,0 +1,327 @@
+/*
+             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 CDC demo. This file contains the main tasks of the demo and
+ *  is responsible for the initial application hardware configuration.
+ */
+
+#include "CDC.h"
+
+/** Contains the current baud rate and other settings of the 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.
+ */
+CDC_Line_Coding_t LineEncoding = { .BaudRateBPS = 0,
+                                   .CharFormat  = OneStopBit,
+                                   .ParityType  = Parity_None,
+                                   .DataBits    = 8            };
+
+
+#if 0
+/* NOTE: Here you can set up a standard stream using the created virtual serial port, so that the standard stream functions in
+ *       <stdio.h> can be used on the virtual serial port (e.g. fprintf(&USBSerial, "Test"); to print a string).
+ */
+	
+static int CDC_putchar(char c, FILE *stream)
+{	  
+	Endpoint_SelectEndpoint(CDC_TX_EPNUM);
+
+	if (!(LineEncoding.BaudRateBPS))
+	  return -1;
+	
+	if (Endpoint_WaitUntilReady())
+	  return -1;
+
+	Endpoint_Write_Byte(c);
+	Endpoint_ClearIN();
+	
+	return 0;
+}
+
+static int CDC_getchar(FILE *stream)
+{
+	int c;
+
+	if (!(LineEncoding.BaudRateBPS))
+	  return -1;
+
+	Endpoint_SelectEndpoint(CDC_RX_EPNUM);
+	
+	for (;;)
+	{
+		if (Endpoint_WaitUntilReady())
+		  return -1;
+	
+		if (!(Endpoint_BytesInEndpoint()))
+		{
+			Endpoint_ClearOUT();
+		}
+		else
+		{
+			c = Endpoint_Read_Byte();
+			break;
+		}
+	}
+	
+	return c;
+}
+
+static FILE USBSerial = FDEV_SETUP_STREAM(CDC_putchar, CDC_getchar, _FDEV_SETUP_RW);
+#endif
+
+/** Main program entry point. This routine contains the overall program flow, including initial
+ *  setup of all components and the main program loop.
+ */
+int main(void)
+{
+	SetupHardware();
+	
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+
+	for (;;)
+	{
+		CDC_Task();
+		USB_USBTask();
+	}
+}
+
+/** Configures the board hardware and chip peripherals for the demo's functionality. */
+void SetupHardware(void)
+{
+	/* 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.
+ */
+void EVENT_USB_Device_Connect(void)
+{
+	/* Indicate USB enumerating */
+	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+}
+
+/** 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.
+ */
+void EVENT_USB_Device_Disconnect(void)
+{
+	/* Indicate USB not ready */
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+}
+
+/** 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 task started.
+ */
+void EVENT_USB_Device_ConfigurationChanged(void)
+{
+	/* Indicate USB connected and ready */
+	LEDs_SetAllLEDs(LEDMASK_USB_READY);
+
+	/* Setup CDC Notification, Rx and Tx Endpoints */
+	if (!(Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
+		                             ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
+	                                 ENDPOINT_BANK_SINGLE)))
+	{
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+	}
+	
+	if (!(Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
+		                             ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
+	                                 ENDPOINT_BANK_SINGLE)))
+	{
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+	}
+	
+	if (!(Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
+		                             ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
+	                                 ENDPOINT_BANK_SINGLE)))
+	{
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+	}
+	
+	/* Reset line encoding baud rate so that the host knows to send new values */
+	LineEncoding.BaudRateBPS = 0;
+}
+
+/** Event handler for the USB_UnhandledControlRequest event. This is used to catch standard and class specific
+ *  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.
+ */
+void EVENT_USB_Device_UnhandledControlRequest(void)
+{
+	/* 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 */
+				Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(CDC_Line_Coding_t));
+				
+				/* 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 */
+				Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(CDC_Line_Coding_t));
+
+				/* 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();
+				
+				/* NOTE: Here you can read in the line state mask from the host, to get the current state of the output handshake
+				         lines. The mask is read in from the wValue parameter in USB_ControlRequest, and can be masked against the
+						 CONTROL_LINE_OUT_* masks to determine the RTS and DTR line states using the following code:
+				*/
+				
+				Endpoint_ClearStatusStage();
+			}
+	
+			break;
+	}
+}
+
+/** Function to manage CDC data transmission and reception to and from the host. */
+void CDC_Task(void)
+{
+	char*       ReportString    = NULL;
+	uint8_t     JoyStatus_LCL   = Joystick_GetStatus();
+	static bool ActionSent      = false;
+	
+	/* Device must be connected and configured for the task to run */
+	if (USB_DeviceState != DEVICE_STATE_Configured)
+	  return;
+	  
+#if 0
+	/* NOTE: Here you can use the notification endpoint to send back line state changes to the host, for the special RS-232
+	 *       handshake signal lines (and some error states), via the CONTROL_LINE_IN_* masks and the following code:
+	 */
+	USB_Notification_Header_t Notification = (USB_Notification_Header_t)
+		{
+			.NotificationType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
+			.Notification     = NOTIF_SerialState,
+			.wValue           = 0,
+			.wIndex           = 0,
+			.wLength          = sizeof(uint16_t),
+		};
+		
+	uint16_t LineStateMask;
+	
+	// Set LineStateMask here to a mask of CONTROL_LINE_IN_* masks to set the input handshake line states to send to the host
+	
+	Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);
+	Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));
+	Endpoint_Write_Stream_LE(&LineStateMask, sizeof(LineStateMask));
+	Endpoint_ClearIN();
+#endif
+
+	/* Determine if a joystick action has occurred */
+	if (JoyStatus_LCL & JOY_UP)
+	  ReportString = "Joystick Up\r\n";
+	else if (JoyStatus_LCL & JOY_DOWN)
+	  ReportString = "Joystick Down\r\n";
+	else if (JoyStatus_LCL & JOY_LEFT)
+	  ReportString = "Joystick Left\r\n";
+	else if (JoyStatus_LCL & JOY_RIGHT)
+	  ReportString = "Joystick Right\r\n";
+	else if (JoyStatus_LCL & JOY_PRESS)
+	  ReportString = "Joystick Pressed\r\n";
+	else
+	  ActionSent = false;
+
+	/* Flag management - Only allow one string to be sent per action */
+	if ((ReportString != NULL) && (ActionSent == false) && LineEncoding.BaudRateBPS)
+	{
+		ActionSent = true;
+
+		/* Select the Serial Tx Endpoint */
+		Endpoint_SelectEndpoint(CDC_TX_EPNUM);
+
+		/* Write the String to the Endpoint */
+		Endpoint_Write_Stream_LE(ReportString, strlen(ReportString));
+		
+		/* Remember if the packet to send completely fills the endpoint */
+		bool IsFull = (Endpoint_BytesInEndpoint() == CDC_TXRX_EPSIZE);
+
+		/* Finalize the stream transfer to send the last packet */
+		Endpoint_ClearIN();
+
+		/* If the last packet filled the endpoint, send an empty packet to release the buffer on 
+		 * the receiver (otherwise all data will be cached until a non-full packet is received) */
+		if (IsFull)
+		{
+			/* Wait until the endpoint is ready for another packet */
+			Endpoint_WaitUntilReady();
+			
+			/* 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(CDC_RX_EPNUM);
+	
+	/* Throw away any received data from the host */
+	if (Endpoint_IsOUTReceived())
+	  Endpoint_ClearOUT();
+}