Demos/Host/LowLevel/CDCHost/CDCHost.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 CDCHost demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "CDCHost.h"
  38
  39 /** Main program entry point. This routine configures the hardware required by the application, then
  40  *  starts the scheduler to run the application tasks.
  41  */
  42 int main(void)
  43 {
  44         SetupHardware();
  45
  46         puts_P(PSTR(ESC_RESET ESC_BG_WHITE ESC_INVERSE_ON ESC_ERASE_DISPLAY
  47                "CDC Host Demo running.\r\n" ESC_INVERSE_OFF));
  48
  49         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  50
  51         for (;;)
  52         {
  53                 CDC_Host_Task();
  54                 USB_USBTask();
  55         }
  56 }
  57
  58 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  59 void SetupHardware(void)
  60 {
  61         /* Disable watchdog if enabled by bootloader/fuses */
  62         MCUSR &= ~(1 << WDRF);
  63         wdt_disable();
  64
  65         /* Disable clock division */
  66         clock_prescale_set(clock_div_1);
  67
  68         /* Hardware Initialization */
  69         SerialStream_Init(9600, false);
  70         LEDs_Init();
  71         USB_Init();
  72 }
  73
  74 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
  75  *  starts the library USB task to begin the enumeration and USB management process.
  76  */
  77 void EVENT_USB_DeviceAttached(void)
  78 {
  79         puts_P(PSTR("Device Attached.\r\n"));
  80         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  81 }
  82
  83 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
  84  *  stops the library USB task management process.
  85  */
  86 void EVENT_USB_DeviceUnattached(void)
  87 {
  88         puts_P(PSTR("\r\nDevice Unattached.\r\n"));
  89         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  90 }
  91
  92 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
  93  *  enumerated by the host and is now ready to be used by the application.
  94  */
  95 void EVENT_USB_DeviceEnumerationComplete(void)
  96 {
  97         LEDs_SetAllLEDs(LEDMASK_USB_READY);
  98 }
  99
 100 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 101 void EVENT_USB_HostError(const uint8_t ErrorCode)
 102 {
 103         USB_ShutDown();
 104
 105         puts_P(PSTR(ESC_BG_RED "Host Mode Error\r\n"));
 106         printf_P(PSTR(" -- Error Code %d\r\n"), ErrorCode);
 107
 108         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 109         for(;;);
 110 }
 111
 112 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 113  *  enumerating an attached USB device.
 114  */
 115 void EVENT_USB_DeviceEnumerationFailed(const uint8_t ErrorCode, const uint8_t SubErrorCode)
 116 {
 117         puts_P(PSTR(ESC_BG_RED "Dev Enum Error\r\n"));
 118         printf_P(PSTR(" -- Error Code %d\r\n"), ErrorCode);
 119         printf_P(PSTR(" -- Sub Error Code %d\r\n"), SubErrorCode);
 120         printf_P(PSTR(" -- In State %d\r\n"), USB_HostState);
 121
 122         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 123 }
 124
 125 /** Task to set the configuration of the attached device after it has been enumerated, and to read in
 126  *  data received from the attached CDC device and print it to the serial port.
 127  */
 128 void CDC_Host_Task(void)
 129 {
 130         uint8_t ErrorCode;
 131
 132         switch (USB_HostState)
 133         {
 134                 case HOST_STATE_Addressed:
 135                         /* Standard request to set the device configuration to configuration 1 */
 136                         USB_ControlRequest = (USB_Request_Header_t)
 137                                 {
 138                                         .bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_DEVICE),
 139                                         .bRequest      = REQ_SetConfiguration,
 140                                         .wValue        = 1,
 141                                         .wIndex        = 0,
 142                                         .wLength       = 0,
 143                                 };
 144
 145                         /* Select the control pipe for the request transfer */
 146                         Pipe_SelectPipe(PIPE_CONTROLPIPE);
 147
 148                         /* Send the request, display error and wait for device detach if request fails */
 149                         if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
 150                         {
 151                                 puts_P(PSTR("Control Error (Set Configuration).\r\n"));
 152                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 153
 154                                 /* Indicate error via status LEDs */
 155                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 156
 157                                 /* Wait until USB device disconnected */
 158                                 while (USB_IsConnected);
 159                                 break;
 160                         }
 161
 162                         USB_HostState = HOST_STATE_Configured;
 163                         break;
 164                 case HOST_STATE_Configured:
 165                         puts_P(PSTR("Getting Config Data.\r\n"));
 166
 167                         /* Get and process the configuration descriptor data */
 168                         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 169                         {
 170                                 if (ErrorCode == ControlError)
 171                                   puts_P(PSTR("Control Error (Get Configuration).\r\n"));
 172                                 else
 173                                   puts_P(PSTR("Invalid Device.\r\n"));
 174
 175                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 176
 177                                 /* Indicate error via status LEDs */
 178                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 179
 180                                 /* Wait until USB device disconnected */
 181                                 while (USB_IsConnected);
 182                                 break;
 183                         }
 184
 185                         puts_P(PSTR("CDC Device Enumerated.\r\n"));
 186
 187                         USB_HostState = HOST_STATE_Ready;
 188                         break;
 189                 case HOST_STATE_Ready:
 190                         /* Select and the data IN pipe */
 191                         Pipe_SelectPipe(CDC_DATAPIPE_IN);
 192
 193                         /* Check to see if a packet has been received */
 194                         if (Pipe_IsINReceived())
 195                         {
 196                                 /* Check if data is in the pipe */
 197                                 if (Pipe_IsReadWriteAllowed())
 198                                 {
 199                                         /* Get the length of the pipe data, and create a new buffer to hold it */
 200                                         uint16_t BufferLength = Pipe_BytesInPipe();
 201                                         uint8_t  Buffer[BufferLength];
 202
 203                                         /* Read in the pipe data to the temporary buffer */
 204                                         Pipe_Read_Stream_LE(Buffer, BufferLength);
 205
 206                                         /* Print out the buffer contents to the USART */
 207                                         for (uint16_t BufferByte = 0; BufferByte < BufferLength; BufferByte++)
 208                                           putchar(Buffer[BufferByte]);
 209                                 }
 210
 211                                 /* Clear the pipe after it is read, ready for the next packet */
 212                                 Pipe_ClearIN();
 213                         }
 214
 215                         /* Select and unfreeze the notification pipe */
 216                         Pipe_SelectPipe(CDC_NOTIFICATIONPIPE);
 217                         Pipe_Unfreeze();
 218
 219                         /* Check if a packet has been received */
 220                         if (Pipe_IsINReceived())
 221                         {
 222                                 /* Discard the unused event notification */
 223                                 Pipe_ClearIN();
 224                         }
 225
 226                         /* Freeze notification IN pipe after use */
 227                         Pipe_Freeze();
 228
 229                         break;
 230         }
 231 }