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_FG_CYAN "CDC Host Demo running.\r\n" ESC_FG_WHITE));
  47
  48         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  49
  50         for (;;)
  51         {
  52                 CDC_Host_Task();
  53                 USB_USBTask();
  54         }
  55 }
  56
  57 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  58 void SetupHardware(void)
  59 {
  60         /* Disable watchdog if enabled by bootloader/fuses */
  61         MCUSR &= ~(1 << WDRF);
  62         wdt_disable();
  63
  64         /* Disable clock division */
  65         clock_prescale_set(clock_div_1);
  66
  67         /* Hardware Initialization */
  68         SerialStream_Init(9600, false);
  69         LEDs_Init();
  70         USB_Init();
  71 }
  72
  73 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
  74  *  starts the library USB task to begin the enumeration and USB management process.
  75  */
  76 void EVENT_USB_Host_DeviceAttached(void)
  77 {
  78         puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
  79         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  80 }
  81
  82 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
  83  *  stops the library USB task management process.
  84  */
  85 void EVENT_USB_Host_DeviceUnattached(void)
  86 {
  87         puts_P(PSTR(ESC_FG_GREEN "\r\nDevice Unattached.\r\n" ESC_FG_WHITE));
  88         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  89 }
  90
  91 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
  92  *  enumerated by the host and is now ready to be used by the application.
  93  */
  94 void EVENT_USB_Host_DeviceEnumerationComplete(void)
  95 {
  96         LEDs_SetAllLEDs(LEDMASK_USB_READY);
  97 }
  98
  99 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 100 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 101 {
 102         USB_ShutDown();
 103
 104         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 105                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 106
 107         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 108         for(;;);
 109 }
 110
 111 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 112  *  enumerating an attached USB device.
 113  */
 114 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode, const uint8_t SubErrorCode)
 115 {
 116         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 117                                  " -- Error Code %d\r\n"
 118                                  " -- Sub Error Code %d\r\n"
 119                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 120
 121         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 122 }
 123
 124 /** Task to set the configuration of the attached device after it has been enumerated, and to read in
 125  *  data received from the attached CDC device and print it to the serial port.
 126  */
 127 void CDC_Host_Task(void)
 128 {
 129         uint8_t ErrorCode;
 130
 131         switch (USB_HostState)
 132         {
 133                 case HOST_STATE_Addressed:
 134                         puts_P(PSTR("Getting Config Data.\r\n"));
 135
 136                         /* Get and process the configuration descriptor data */
 137                         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 138                         {
 139                                 if (ErrorCode == ControlError)
 140                                   puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
 141                                 else
 142                                   puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
 143
 144                                 printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 145
 146                                 /* Indicate error via status LEDs */
 147                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 148
 149                                 /* Wait until USB device disconnected */
 150                                 USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 151                                 break;
 152                         }
 153
 154                         /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
 155                         if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
 156                         {
 157                                 printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
 158                                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 159
 160                                 /* Indicate error via status LEDs */
 161                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 162
 163                                 /* Wait until USB device disconnected */
 164                                 USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 165                                 break;
 166                         }
 167
 168                         puts_P(PSTR("CDC Device Enumerated.\r\n"));
 169
 170                         USB_HostState = HOST_STATE_Configured;
 171                         break;
 172                 case HOST_STATE_Configured:
 173                         /* Select and the data IN pipe */
 174                         Pipe_SelectPipe(CDC_DATAPIPE_IN);
 175                         Pipe_Unfreeze();
 176
 177                         /* Check to see if a packet has been received */
 178                         if (Pipe_IsINReceived())
 179                         {
 180                                 /* Re-freeze IN pipe after the packet has been received */
 181                                 Pipe_Freeze();
 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                         /* Re-freeze IN pipe after use */
 203                         Pipe_Freeze();
 204
 205                         /* Select and unfreeze the notification pipe */
 206                         Pipe_SelectPipe(CDC_NOTIFICATIONPIPE);
 207                         Pipe_Unfreeze();
 208
 209                         /* Check if a packet has been received */
 210                         if (Pipe_IsINReceived())
 211                         {
 212                                 /* Discard the unused event notification */
 213                                 Pipe_ClearIN();
 214                         }
 215
 216                         /* Freeze notification IN pipe after use */
 217                         Pipe_Freeze();
 218
 219                         break;
 220         }
 221 }