Demos/Device/LowLevel/RNDISEthernet/RNDISEthernet.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Main source file for the RNDISEthernet demo. This file contains the main tasks of the demo and
  34  *  is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "RNDISEthernet.h"
  38
  39 /** Main program entry point. This routine configures the hardware required by the application, then
  40  *  enters a loop to run the application tasks in sequence.
  41  */
  42 int main(void)
  43 {
  44         SetupHardware();
  45
  46         /* Webserver Initialization */
  47         TCP_Init();
  48         Webserver_Init();
  49
  50         printf_P(PSTR("\r\n\r\n****** RNDIS Demo running. ******\r\n"));
  51
  52         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  53
  54         for (;;)
  55         {
  56                 Ethernet_Task();
  57                 TCP_Task();
  58                 RNDIS_Task();
  59                 USB_USBTask();
  60         }
  61 }
  62
  63 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  64 void SetupHardware(void)
  65 {
  66         /* Disable watchdog if enabled by bootloader/fuses */
  67         MCUSR &= ~(1 << WDRF);
  68         wdt_disable();
  69
  70         /* Disable clock division */
  71         clock_prescale_set(clock_div_1);
  72
  73         /* Hardware Initialization */
  74         LEDs_Init();
  75         SerialStream_Init(9600, false);
  76         USB_Init();
  77 }
  78
  79 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
  80  *  starts the library USB task to begin the enumeration and USB management process.
  81  */
  82 void EVENT_USB_Device_Connect(void)
  83 {
  84         /* Indicate USB enumerating */
  85         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  86 }
  87
  88 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
  89  *  the status LEDs and stops all the relevant tasks.
  90  */
  91 void EVENT_USB_Device_Disconnect(void)
  92 {
  93         /* Indicate USB not ready */
  94         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  95 }
  96
  97 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host sets the current configuration
  98  *  of the USB device after enumeration, and configures the RNDIS device endpoints and starts the relevant tasks.
  99  */
 100 void EVENT_USB_Device_ConfigurationChanged(void)
 101 {
 102         /* Indicate USB connected and ready */
 103         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 104
 105         /* Setup CDC Notification, Rx and Tx Endpoints */
 106         if (!(Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
 107                                              ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
 108                                          ENDPOINT_BANK_SINGLE)))
 109         {
 110                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 111         }
 112
 113         if (!(Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
 114                                              ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
 115                                          ENDPOINT_BANK_SINGLE)))
 116         {
 117                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 118         }
 119
 120         if (!(Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
 121                                              ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
 122                                          ENDPOINT_BANK_SINGLE)))
 123         {
 124                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 125         }
 126 }
 127
 128 /** Event handler for the USB_UnhandledControlRequest event. This is used to catch standard and class specific
 129  *  control requests that are not handled internally by the USB library (including the RNDIS control commands,
 130  *  which set up the USB RNDIS network adapter), so that they can be handled appropriately for the application.
 131  */
 132 void EVENT_USB_Device_UnhandledControlRequest(void)
 133 {
 134         /* Process RNDIS class commands */
 135         switch (USB_ControlRequest.bRequest)
 136         {
 137                 case REQ_SendEncapsulatedCommand:
 138                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 139                         {
 140                                 /* Clear the SETUP packet, ready for data transfer */
 141                                 Endpoint_ClearSETUP();
 142
 143                                 /* Read in the RNDIS message into the message buffer */
 144                                 Endpoint_Read_Control_Stream_LE(RNDISMessageBuffer, USB_ControlRequest.wLength);
 145
 146                                 /* Finalize the stream transfer to clear the last packet from the host */
 147                                 Endpoint_ClearIN();
 148
 149                                 /* Process the RNDIS message */
 150                                 ProcessRNDISControlMessage();
 151                         }
 152
 153                         break;
 154                 case REQ_GetEncapsulatedResponse:
 155                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 156                         {
 157                                 /* Clear the SETUP packet, ready for data transfer */
 158                                 Endpoint_ClearSETUP();
 159
 160                                 /* Check if a response to the last message is ready */
 161                                 if (!(MessageHeader->MessageLength))
 162                                 {
 163                                         /* Set the response to a single 0x00 byte to indicate that no response is ready */
 164                                         RNDISMessageBuffer[0] = 0;
 165                                         MessageHeader->MessageLength = 1;
 166                                 }
 167
 168                                 /* Write the message response data to the endpoint */
 169                                 Endpoint_Write_Control_Stream_LE(RNDISMessageBuffer, MessageHeader->MessageLength);
 170
 171                                 /* Finalize the stream transfer to send the last packet or clear the host abort */
 172                                 Endpoint_ClearOUT();
 173
 174                                 /* Reset the message header once again after transmission */
 175                                 MessageHeader->MessageLength = 0;
 176                         }
 177
 178                         break;
 179         }
 180 }
 181
 182 /** Task to manage the sending and receiving of encapsulated RNDIS data and notifications. This removes the RNDIS
 183  *  wrapper from received Ethernet frames and places them in the FrameIN global buffer, or adds the RNDIS wrapper
 184  *  to a frame in the FrameOUT global before sending the buffer contents to the host.
 185  */
 186 void RNDIS_Task(void)
 187 {
 188         /* Select the notification endpoint */
 189         Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);
 190
 191         /* Check if a message response is ready for the host */
 192         if (Endpoint_IsINReady() && ResponseReady)
 193         {
 194                 USB_Notification_t Notification = (USB_Notification_t)
 195                         {
 196                                 .bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
 197                                 .bNotification = NOTIF_RESPONSE_AVAILABLE,
 198                                 .wValue        = 0,
 199                                 .wIndex        = 0,
 200                                 .wLength       = 0,
 201                         };
 202
 203                 /* Indicate that a message response is ready for the host */
 204                 Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));
 205
 206                 /* Finalize the stream transfer to send the last packet */
 207                 Endpoint_ClearIN();
 208
 209                 /* Indicate a response is no longer ready */
 210                 ResponseReady = false;
 211         }
 212
 213         /* Don't process the data endpoints until the system is in the data initialized state, and the buffer is free */
 214         if ((CurrRNDISState == RNDIS_Data_Initialized) && !(MessageHeader->MessageLength))
 215         {
 216                 /* Create a new packet header for reading/writing */
 217                 RNDIS_Packet_Message_t RNDISPacketHeader;
 218
 219                 /* Select the data OUT endpoint */
 220                 Endpoint_SelectEndpoint(CDC_RX_EPNUM);
 221
 222                 /* Check if the data OUT endpoint contains data, and that the IN buffer is empty */
 223                 if (Endpoint_IsOUTReceived() && !(FrameIN.FrameInBuffer))
 224                 {
 225                         /* Read in the packet message header */
 226                         Endpoint_Read_Stream_LE(&RNDISPacketHeader, sizeof(RNDIS_Packet_Message_t));
 227
 228                         /* Stall the request if the data is too large */
 229                         if (RNDISPacketHeader.DataLength > ETHERNET_FRAME_SIZE_MAX)
 230                         {
 231                                 Endpoint_StallTransaction();
 232                                 return;
 233                         }
 234
 235                         /* Read in the Ethernet frame into the buffer */
 236                         Endpoint_Read_Stream_LE(FrameIN.FrameData, RNDISPacketHeader.DataLength);
 237
 238                         /* Finalize the stream transfer to send the last packet */
 239                         Endpoint_ClearOUT();
 240
 241                         /* Store the size of the Ethernet frame */
 242                         FrameIN.FrameLength = RNDISPacketHeader.DataLength;
 243
 244                         /* Indicate Ethernet IN buffer full */
 245                         FrameIN.FrameInBuffer = true;
 246                 }
 247
 248                 /* Select the data IN endpoint */
 249                 Endpoint_SelectEndpoint(CDC_TX_EPNUM);
 250
 251                 /* Check if the data IN endpoint is ready for more data, and that the IN buffer is full */
 252                 if (Endpoint_IsINReady() && FrameOUT.FrameInBuffer)
 253                 {
 254                         /* Clear the packet header with all 0s so that the relevant fields can be filled */
 255                         memset(&RNDISPacketHeader, 0, sizeof(RNDIS_Packet_Message_t));
 256
 257                         /* Construct the required packet header fields in the buffer */
 258                         RNDISPacketHeader.MessageType   = REMOTE_NDIS_PACKET_MSG;
 259                         RNDISPacketHeader.MessageLength = (sizeof(RNDIS_Packet_Message_t) + FrameOUT.FrameLength);
 260                         RNDISPacketHeader.DataOffset    = (sizeof(RNDIS_Packet_Message_t) - sizeof(RNDIS_Message_Header_t));
 261                         RNDISPacketHeader.DataLength    = FrameOUT.FrameLength;
 262
 263                         /* Send the packet header to the host */
 264                         Endpoint_Write_Stream_LE(&RNDISPacketHeader, sizeof(RNDIS_Packet_Message_t));
 265
 266                         /* Send the Ethernet frame data to the host */
 267                         Endpoint_Write_Stream_LE(FrameOUT.FrameData, RNDISPacketHeader.DataLength);
 268
 269                         /* Finalize the stream transfer to send the last packet */
 270                         Endpoint_ClearIN();
 271
 272                         /* Indicate Ethernet OUT buffer no longer full */
 273                         FrameOUT.FrameInBuffer = false;
 274                 }
 275         }
 276 }
 277
 278 /** Ethernet frame processing task. This task checks to see if a frame has been received, and if so hands off the processing
 279  *  of the frame to the Ethernet processing routines.
 280  */
 281 void Ethernet_Task(void)
 282 {
 283         /* Task for Ethernet processing. Incoming ethernet frames are loaded into the FrameIN structure, and
 284            outgoing frames should be loaded into the FrameOUT structure. Both structures can only hold a single
 285            Ethernet frame at a time, so the FrameInBuffer bool is used to indicate when the buffers contain data. */
 286
 287         /* Device must be connected and configured for the task to run */
 288         if (USB_DeviceState != DEVICE_STATE_Configured)
 289           return;
 290
 291         /* Check if a frame has been written to the IN frame buffer */
 292         if (FrameIN.FrameInBuffer)
 293         {
 294                 /* Indicate packet processing started */
 295                 LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
 296
 297                 /* Process the ethernet frame - replace this with your own Ethernet handler code as desired */
 298                 Ethernet_ProcessPacket();
 299
 300                 /* Indicate packet processing complete */
 301                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 302         }
 303 }