Demos/Host/LowLevel/VirtualSerialHost/VirtualSerialHost.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  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         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_Host_DeviceAttached(void)
  78 {
  79         puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
  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_Host_DeviceUnattached(void)
  87 {
  88         puts_P(PSTR(ESC_FG_GREEN "\r\nDevice Unattached.\r\n" ESC_FG_WHITE));
  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_Host_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_Host_HostError(const uint8_t ErrorCode)
 102 {
 103         USB_ShutDown();
 104
 105         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 106                                  " -- Error Code %d\r\n" ESC_FG_WHITE), 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_Host_DeviceEnumerationFailed(const uint8_t ErrorCode, const uint8_t SubErrorCode)
 116 {
 117         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 118                                  " -- Error Code %d\r\n"
 119                                  " -- Sub Error Code %d\r\n"
 120                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, 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(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
 142                                 else
 143                                   puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
 144
 145                                 printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 146
 147                                 /* Indicate error via status LEDs */
 148                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 149
 150                                 /* Wait until USB device disconnected */
 151                                 USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 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                                 printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
 159                                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 160
 161                                 /* Indicate error via status LEDs */
 162                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 163
 164                                 /* Wait until USB device disconnected */
 165                                 USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 166                                 break;
 167                         }
 168
 169                         puts_P(PSTR("CDC Device Enumerated.\r\n"));
 170
 171                         USB_HostState = HOST_STATE_Configured;
 172                         break;
 173                 case HOST_STATE_Configured:
 174                         /* Select the data IN pipe */
 175                         Pipe_SelectPipe(CDC_DATAPIPE_IN);
 176                         Pipe_Unfreeze();
 177
 178                         /* Check to see if a packet has been received */
 179                         if (Pipe_IsINReceived())
 180                         {
 181                                 /* Re-freeze IN pipe after the packet has been received */
 182                                 Pipe_Freeze();
 183
 184                                 /* Check if data is in the pipe */
 185                                 if (Pipe_IsReadWriteAllowed())
 186                                 {
 187                                         /* Get the length of the pipe data, and create a new buffer to hold it */
 188                                         uint16_t BufferLength = Pipe_BytesInPipe();
 189                                         uint8_t  Buffer[BufferLength];
 190
 191                                         /* Read in the pipe data to the temporary buffer */
 192                                         Pipe_Read_Stream_LE(Buffer, BufferLength);
 193
 194                                         /* Print out the buffer contents to the USART */
 195                                         for (uint16_t BufferByte = 0; BufferByte < BufferLength; BufferByte++)
 196                                           putchar(Buffer[BufferByte]);
 197                                 }
 198
 199                                 /* Clear the pipe after it is read, ready for the next packet */
 200                                 Pipe_ClearIN();
 201                         }
 202
 203                         /* Re-freeze IN pipe after use */
 204                         Pipe_Freeze();
 205
 206                         /* Select and unfreeze the notification pipe */
 207                         Pipe_SelectPipe(CDC_NOTIFICATIONPIPE);
 208                         Pipe_Unfreeze();
 209
 210                         /* Check if a packet has been received */
 211                         if (Pipe_IsINReceived())
 212                         {
 213                                 /* Discard the unused event notification */
 214                                 Pipe_ClearIN();
 215                         }
 216
 217                         /* Freeze notification IN pipe after use */
 218                         Pipe_Freeze();
 219
 220                         break;
 221         }
 222 }