Demos/Host/LowLevel/VirtualSerialHost/VirtualSerialHost.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all 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 VirtualSerialHost demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "VirtualSerialHost.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         puts_P(PSTR(ESC_FG_CYAN "CDC Host Demo running.\r\n" ESC_FG_WHITE));
  47
  48         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  49         sei();
  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         Serial_Init(9600, false);
  70         LEDs_Init();
  71         USB_Init();
  72
  73         /* Create a stdio stream for the serial port for stdin and stdout */
  74         Serial_CreateStream(NULL);
  75 }
  76
  77 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
  78  *  starts the library USB task to begin the enumeration and USB management process.
  79  */
  80 void EVENT_USB_Host_DeviceAttached(void)
  81 {
  82         puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
  83         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  84 }
  85
  86 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
  87  *  stops the library USB task management process.
  88  */
  89 void EVENT_USB_Host_DeviceUnattached(void)
  90 {
  91         puts_P(PSTR(ESC_FG_GREEN "\r\nDevice Unattached.\r\n" ESC_FG_WHITE));
  92         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  93 }
  94
  95 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
  96  *  enumerated by the host and is now ready to be used by the application.
  97  */
  98 void EVENT_USB_Host_DeviceEnumerationComplete(void)
  99 {
 100         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 101 }
 102
 103 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 104 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 105 {
 106         USB_Disable();
 107
 108         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 109                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 110
 111         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 112         for(;;);
 113 }
 114
 115 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 116  *  enumerating an attached USB device.
 117  */
 118 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 119                                             const uint8_t SubErrorCode)
 120 {
 121         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 122                                  " -- Error Code %d\r\n"
 123                                  " -- Sub Error Code %d\r\n"
 124                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 125
 126         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 127 }
 128
 129 /** Task to set the configuration of the attached device after it has been enumerated, and to read in
 130  *  data received from the attached CDC device and print it to the serial port.
 131  */
 132 void CDC_Host_Task(void)
 133 {
 134         uint8_t ErrorCode;
 135
 136         switch (USB_HostState)
 137         {
 138                 case HOST_STATE_Addressed:
 139                         puts_P(PSTR("Getting Config Data.\r\n"));
 140
 141                         /* Get and process the configuration descriptor data */
 142                         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 143                         {
 144                                 if (ErrorCode == ControlError)
 145                                   puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
 146                                 else
 147                                   puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
 148
 149                                 printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 150
 151                                 /* Indicate error via status LEDs */
 152                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 153
 154                                 /* Wait until USB device disconnected */
 155                                 USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 156                                 break;
 157                         }
 158
 159                         /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
 160                         if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
 161                         {
 162                                 printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
 163                                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 164
 165                                 /* Indicate error via status LEDs */
 166                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 167
 168                                 /* Wait until USB device disconnected */
 169                                 USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 170                                 break;
 171                         }
 172
 173                         puts_P(PSTR("CDC Device Enumerated.\r\n"));
 174
 175                         USB_HostState = HOST_STATE_Configured;
 176                         break;
 177                 case HOST_STATE_Configured:
 178                         /* Select the data IN pipe */
 179                         Pipe_SelectPipe(CDC_DATA_IN_PIPE);
 180                         Pipe_Unfreeze();
 181
 182                         /* Check to see if a packet has been received */
 183                         if (Pipe_IsINReceived())
 184                         {
 185                                 /* Re-freeze IN pipe after the packet has been received */
 186                                 Pipe_Freeze();
 187
 188                                 /* Check if data is in the pipe */
 189                                 if (Pipe_IsReadWriteAllowed())
 190                                 {
 191                                         /* Get the length of the pipe data, and create a new buffer to hold it */
 192                                         uint16_t BufferLength = Pipe_BytesInPipe();
 193                                         uint8_t  Buffer[BufferLength];
 194
 195                                         /* Read in the pipe data to the temporary buffer */
 196                                         Pipe_Read_Stream_LE(Buffer, BufferLength, NULL);
 197
 198                                         /* Print out the buffer contents to the USART */
 199                                         for (uint16_t BufferByte = 0; BufferByte < BufferLength; BufferByte++)
 200                                           putchar(Buffer[BufferByte]);
 201                                 }
 202
 203                                 /* Clear the pipe after it is read, ready for the next packet */
 204                                 Pipe_ClearIN();
 205                         }
 206
 207                         /* Re-freeze IN pipe after use */
 208                         Pipe_Freeze();
 209
 210                         /* Select and unfreeze the notification pipe */
 211                         Pipe_SelectPipe(CDC_NOTIFICATION_PIPE);
 212                         Pipe_Unfreeze();
 213
 214                         /* Check if a packet has been received */
 215                         if (Pipe_IsINReceived())
 216                         {
 217                                 /* Discard the unused event notification */
 218                                 Pipe_ClearIN();
 219                         }
 220
 221                         /* Freeze notification IN pipe after use */
 222                         Pipe_Freeze();
 223
 224                         break;
 225         }
 226 }
 227