RNDISEthernet.c 11.8 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
/*
             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 RNDISEthernet demo. This file contains the main tasks of the demo and
 *  is responsible for the initial application hardware configuration.
 */

#include "RNDISEthernet.h"

/* Scheduler Task List */
TASK_LIST
{
42
43
44
45
	{ .Task = USB_USBTask          , .TaskStatus = TASK_STOP },
	{ .Task = Ethernet_Task        , .TaskStatus = TASK_STOP },
	{ .Task = TCP_Task             , .TaskStatus = TASK_STOP },
	{ .Task = RNDIS_Task           , .TaskStatus = TASK_STOP },
46
47
48
49
50
51
52
53
54
55
56
};

/** Main program entry point. This routine configures the hardware required by the application, then
 *  starts the scheduler to run the USB management task.
 */
int main(void)
{
	/* Disable watchdog if enabled by bootloader/fuses */
	MCUSR &= ~(1 << WDRF);
	wdt_disable();

57
58
	/* Disable clock division */
	clock_prescale_set(clock_div_1);
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85

	/* Hardware Initialization */
	LEDs_Init();
	SerialStream_Init(9600, false);
	
	/* Webserver Initialization */
	TCP_Init();
	Webserver_Init();

	printf_P(PSTR("\r\n\r\n****** RNDIS Demo running. ******\r\n"));

	/* Indicate USB not ready */
	UpdateStatus(Status_USBNotReady);
	
	/* Initialize Scheduler so that it can be used */
	Scheduler_Init();

	/* Initialize USB Subsystem */
	USB_Init();

	/* Scheduling - routine never returns, so put this last in the main function */
	Scheduler_Start();
}

/** 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.
 */
86
void EVENT_USB_Connect(void)
87
88
89
90
91
92
93
94
95
{
	/* Start USB management task */
	Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);

	/* Indicate USB enumerating */
	UpdateStatus(Status_USBEnumerating);
}

/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
96
 *  the status LEDs and stops all the relevant tasks.
97
 */
98
void EVENT_USB_Disconnect(void)
99
100
101
102
103
104
105
106
107
108
109
110
{
	/* Stop running TCP/IP and USB management tasks */
	Scheduler_SetTaskMode(RNDIS_Task, TASK_STOP);
	Scheduler_SetTaskMode(Ethernet_Task, TASK_STOP);
	Scheduler_SetTaskMode(TCP_Task, TASK_STOP);
	Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);

	/* Indicate USB not ready */
	UpdateStatus(Status_USBNotReady);
}

/** Event handler for the USB_ConfigurationChanged event. This is fired when the host sets the current configuration
111
 *  of the USB device after enumeration, and configures the RNDIS device endpoints and starts the relevant tasks.
112
 */
113
void EVENT_USB_ConfigurationChanged(void)
114
115
116
117
118
119
120
121
122
123
{
	/* Setup CDC Notification, Rx and Tx Endpoints */
	Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
		                       ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
	                           ENDPOINT_BANK_SINGLE);

	Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
		                       ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
	                           ENDPOINT_BANK_SINGLE);

124
125
126
127
	Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
		                       ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
	                           ENDPOINT_BANK_SINGLE);

128
129
130
131
132
133
134
135
136
137
138
139
140
	/* Indicate USB connected and ready */
	UpdateStatus(Status_USBReady);

	/* Start TCP/IP tasks */
	Scheduler_SetTaskMode(RNDIS_Task, TASK_RUN);
	Scheduler_SetTaskMode(Ethernet_Task, TASK_RUN);
	Scheduler_SetTaskMode(TCP_Task, TASK_RUN);
}

/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
 *  control requests that are not handled internally by the USB library (including the RNDIS control commands,
 *  which set up the USB RNDIS network adapter), so that they can be handled appropriately for the application.
 */
141
void EVENT_USB_UnhandledControlPacket(void)
142
143
{
	/* Process RNDIS class commands */
144
	switch (USB_ControlRequest.bRequest)
145
	{
146
		case REQ_SendEncapsulatedCommand:
147
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
148
149
			{
				/* Clear the SETUP packet, ready for data transfer */
150
				Endpoint_ClearSETUP();
151
152
				
				/* Read in the RNDIS message into the message buffer */
153
				Endpoint_Read_Control_Stream_LE(RNDISMessageBuffer, USB_ControlRequest.wLength);
154
155

				/* Finalize the stream transfer to clear the last packet from the host */
156
				Endpoint_ClearIN();
157
158
159
160
161
162

				/* Process the RNDIS message */
				ProcessRNDISControlMessage();
			}
			
			break;
163
		case REQ_GetEncapsulatedResponse:
164
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
165
			{
166
167
168
				/* Clear the SETUP packet, ready for data transfer */
				Endpoint_ClearSETUP();
				
169
170
171
172
173
174
175
176
177
				/* Check if a response to the last message is ready */
				if (!(MessageHeader->MessageLength))
				{
					/* Set the response to a single 0x00 byte to indicate that no response is ready */
					RNDISMessageBuffer[0] = 0;
					MessageHeader->MessageLength = 1;
				}

				/* Write the message response data to the endpoint */
178
				Endpoint_Write_Control_Stream_LE(RNDISMessageBuffer, MessageHeader->MessageLength);
179
180
				
				/* Finalize the stream transfer to send the last packet or clear the host abort */
181
				Endpoint_ClearOUT();
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221

				/* Reset the message header once again after transmission */
				MessageHeader->MessageLength = 0;
			}
	
			break;
	}
}

/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
 *  log to a serial port, or anything else that is suitable for status updates.
 *
 *  \param CurrentStatus  Current status of the system, from the RNDISEthernet_StatusCodes_t enum
 */
void UpdateStatus(uint8_t CurrentStatus)
{
	uint8_t LEDMask = LEDS_NO_LEDS;
	
	/* Set the LED mask to the appropriate LED mask based on the given status code */
	switch (CurrentStatus)
	{
		case Status_USBNotReady:
			LEDMask = (LEDS_LED1);
			break;
		case Status_USBEnumerating:
			LEDMask = (LEDS_LED1 | LEDS_LED2);
			break;
		case Status_USBReady:
			LEDMask = (LEDS_LED2 | LEDS_LED4);
			break;
		case Status_ProcessingEthernetFrame:
			LEDMask = (LEDS_LED2 | LEDS_LED3);
			break;		
	}
	
	/* Set the board LEDs to the new LED mask */
	LEDs_SetAllLEDs(LEDMask);
}

/** Task to manage the sending and receiving of encapsulated RNDIS data and notifications. This removes the RNDIS
222
 *  wrapper from received Ethernet frames and places them in the FrameIN global buffer, or adds the RNDIS wrapper
223
224
225
226
227
228
229
230
 *  to a frame in the FrameOUT global before sending the buffer contents to the host.
 */
TASK(RNDIS_Task)
{
	/* Select the notification endpoint */
	Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);

	/* Check if a message response is ready for the host */
231
	if (Endpoint_IsINReady() && ResponseReady)
232
233
234
	{
		USB_Notification_t Notification = (USB_Notification_t)
			{
235
236
237
238
239
				.bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
				.bNotification = NOTIF_RESPONSE_AVAILABLE,
				.wValue        = 0,
				.wIndex        = 0,
				.wLength       = 0,
240
241
242
243
244
245
			};
		
		/* Indicate that a message response is ready for the host */
		Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));

		/* Finalize the stream transfer to send the last packet */
246
		Endpoint_ClearIN();
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261

		/* Indicate a response is no longer ready */
		ResponseReady = false;
	}
	
	/* Don't process the data endpoints until the system is in the data initialized state, and the buffer is free */
	if ((CurrRNDISState == RNDIS_Data_Initialized) && !(MessageHeader->MessageLength))
	{
		/* Create a new packet header for reading/writing */
		RNDIS_PACKET_MSG_t RNDISPacketHeader;

		/* Select the data OUT endpoint */
		Endpoint_SelectEndpoint(CDC_RX_EPNUM);
		
		/* Check if the data OUT endpoint contains data, and that the IN buffer is empty */
262
		if (Endpoint_IsOUTReceived() && !(FrameIN.FrameInBuffer))
263
264
265
266
267
		{
			/* Read in the packet message header */
			Endpoint_Read_Stream_LE(&RNDISPacketHeader, sizeof(RNDIS_PACKET_MSG_t));

			/* Stall the request if the data is too large */
268
			if (RNDISPacketHeader.DataLength > ETHERNET_FRAME_SIZE_MAX)
269
270
271
272
273
274
275
276
277
			{
				Endpoint_StallTransaction();
				return;
			}
			
			/* Read in the Ethernet frame into the buffer */
			Endpoint_Read_Stream_LE(FrameIN.FrameData, RNDISPacketHeader.DataLength);

			/* Finalize the stream transfer to send the last packet */
278
			Endpoint_ClearOUT();
279
280
281
282
283
284
285
286
287
288
289
290
			
			/* Store the size of the Ethernet frame */
			FrameIN.FrameLength = RNDISPacketHeader.DataLength;

			/* Indicate Ethernet IN buffer full */
			FrameIN.FrameInBuffer = true;
		}
		
		/* Select the data IN endpoint */
		Endpoint_SelectEndpoint(CDC_TX_EPNUM);
		
		/* Check if the data IN endpoint is ready for more data, and that the IN buffer is full */
291
		if (Endpoint_IsINReady() && FrameOUT.FrameInBuffer)
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
		{
			/* Clear the packet header with all 0s so that the relevant fields can be filled */
			memset(&RNDISPacketHeader, 0, sizeof(RNDIS_PACKET_MSG_t));

			/* Construct the required packet header fields in the buffer */
			RNDISPacketHeader.MessageType   = REMOTE_NDIS_PACKET_MSG;
			RNDISPacketHeader.MessageLength = (sizeof(RNDIS_PACKET_MSG_t) + FrameOUT.FrameLength);
			RNDISPacketHeader.DataOffset    = (sizeof(RNDIS_PACKET_MSG_t) - sizeof(RNDIS_Message_Header_t));
			RNDISPacketHeader.DataLength    = FrameOUT.FrameLength;

			/* Send the packet header to the host */
			Endpoint_Write_Stream_LE(&RNDISPacketHeader, sizeof(RNDIS_PACKET_MSG_t));

			/* Send the Ethernet frame data to the host */
			Endpoint_Write_Stream_LE(FrameOUT.FrameData, RNDISPacketHeader.DataLength);
			
			/* Finalize the stream transfer to send the last packet */
309
			Endpoint_ClearIN();
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
			
			/* Indicate Ethernet OUT buffer no longer full */
			FrameOUT.FrameInBuffer = false;
		}
	}
}

/** Ethernet frame processing task. This task checks to see if a frame has been received, and if so hands off the processing
 *  of the frame to the Ethernet processing routines.
 */
TASK(Ethernet_Task)
{
	/* Task for Ethernet processing. Incoming ethernet frames are loaded into the FrameIN structure, and
	   outgoing frames should be loaded into the FrameOUT structure. Both structures can only hold a single
	   Ethernet frame at a time, so the FrameInBuffer bool is used to indicate when the buffers contain data. */

	/* Check if a frame has been written to the IN frame buffer */
	if (FrameIN.FrameInBuffer)
	{
		/* Indicate packet processing started */
		UpdateStatus(Status_ProcessingEthernetFrame);

		/* Process the ethernet frame - replace this with your own Ethernet handler code as desired */
		Ethernet_ProcessPacket();

		/* Indicate packet processing complete */
		UpdateStatus(Status_USBReady);
	}
}