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                         puts_P(PSTR("Getting Config Data.\r\n"));
 136
 137                         /* Get and process the configuration descriptor data */
 138                         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 139                         {
 140                                 if (ErrorCode == ControlError)
 141                                   puts_P(PSTR("Control Error (Get Configuration).\r\n"));
 142                                 else
 143                                   puts_P(PSTR("Invalid Device.\r\n"));
 144
 145                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 146
 147                                 /* Indicate error via status LEDs */
 148                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 149
 150                                 /* Wait until USB device disconnected */
 151                                 while (USB_IsConnected);
 152                                 break;
 153                         }
 154
 155                         /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
 156                         if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
 157                         {
 158                                 puts_P(PSTR("Control Error (Set Configuration).\r\n"));
 159                                 printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
 160
 161                                 /* Indicate error via status LEDs */
 162                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 163
 164                                 /* Wait until USB device disconnected */
 165                                 while (USB_IsConnected);
 166                                 break;
 167                         }
 168
 169                         USB_HostState = HOST_STATE_Configured;
 170                         break;
 171                 case HOST_STATE_Configured:
 172                         puts_P(PSTR("CDC Device Enumerated.\r\n"));
 173
 174                         USB_HostState = HOST_STATE_Ready;
 175                         break;
 176                 case HOST_STATE_Ready:
 177                         /* Select and the data IN pipe */
 178                         Pipe_SelectPipe(CDC_DATAPIPE_IN);
 179
 180                         /* Check to see if a packet has been received */
 181                         if (Pipe_IsINReceived())
 182                         {
 183                                 /* Check if data is in the pipe */
 184                                 if (Pipe_IsReadWriteAllowed())
 185                                 {
 186                                         /* Get the length of the pipe data, and create a new buffer to hold it */
 187                                         uint16_t BufferLength = Pipe_BytesInPipe();
 188                                         uint8_t  Buffer[BufferLength];
 189
 190                                         /* Read in the pipe data to the temporary buffer */
 191                                         Pipe_Read_Stream_LE(Buffer, BufferLength);
 192
 193                                         /* Print out the buffer contents to the USART */
 194                                         for (uint16_t BufferByte = 0; BufferByte < BufferLength; BufferByte++)
 195                                           putchar(Buffer[BufferByte]);
 196                                 }
 197
 198                                 /* Clear the pipe after it is read, ready for the next packet */
 199                                 Pipe_ClearIN();
 200                         }
 201
 202                         /* Select and unfreeze the notification pipe */
 203                         Pipe_SelectPipe(CDC_NOTIFICATIONPIPE);
 204                         Pipe_Unfreeze();
 205
 206                         /* Check if a packet has been received */
 207                         if (Pipe_IsINReceived())
 208                         {
 209                                 /* Discard the unused event notification */
 210                                 Pipe_ClearIN();
 211                         }
 212
 213                         /* Freeze notification IN pipe after use */
 214                         Pipe_Freeze();
 215
 216                         break;
 217         }
 218 }