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         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,
 116                                             const uint8_t SubErrorCode)
 117 {
 118         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 119                                  " -- Error Code %d\r\n"
 120                                  " -- Sub Error Code %d\r\n"
 121                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 122
 123         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 124 }
 125
 126 /** Task to set the configuration of the attached device after it has been enumerated, and to read in
 127  *  data received from the attached CDC device and print it to the serial port.
 128  */
 129 void CDC_Host_Task(void)
 130 {
 131         uint8_t ErrorCode;
 132
 133         switch (USB_HostState)
 134         {
 135                 case HOST_STATE_Addressed:
 136                         puts_P(PSTR("Getting Config Data.\r\n"));
 137
 138                         /* Get and process the configuration descriptor data */
 139                         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 140                         {
 141                                 if (ErrorCode == ControlError)
 142                                   puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
 143                                 else
 144                                   puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
 145
 146                                 printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 147
 148                                 /* Indicate error via status LEDs */
 149                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 150
 151                                 /* Wait until USB device disconnected */
 152                                 USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 153                                 break;
 154                         }
 155
 156                         /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
 157                         if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
 158                         {
 159                                 printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
 160                                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 161
 162                                 /* Indicate error via status LEDs */
 163                                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 164
 165                                 /* Wait until USB device disconnected */
 166                                 USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 167                                 break;
 168                         }
 169
 170                         puts_P(PSTR("CDC Device Enumerated.\r\n"));
 171
 172                         USB_HostState = HOST_STATE_Configured;
 173                         break;
 174                 case HOST_STATE_Configured:
 175                         /* Select the data IN pipe */
 176                         Pipe_SelectPipe(CDC_DATA_IN_PIPE);
 177                         Pipe_Unfreeze();
 178
 179                         /* Check to see if a packet has been received */
 180                         if (Pipe_IsINReceived())
 181                         {
 182                                 /* Re-freeze IN pipe after the packet has been received */
 183                                 Pipe_Freeze();
 184
 185                                 /* Check if data is in the pipe */
 186                                 if (Pipe_IsReadWriteAllowed())
 187                                 {
 188                                         /* Get the length of the pipe data, and create a new buffer to hold it */
 189                                         uint16_t BufferLength = Pipe_BytesInPipe();
 190                                         uint8_t  Buffer[BufferLength];
 191
 192                                         /* Read in the pipe data to the temporary buffer */
 193                                         Pipe_Read_Stream_LE(Buffer, BufferLength, NULL);
 194
 195                                         /* Print out the buffer contents to the USART */
 196                                         for (uint16_t BufferByte = 0; BufferByte < BufferLength; BufferByte++)
 197                                           putchar(Buffer[BufferByte]);
 198                                 }
 199
 200                                 /* Clear the pipe after it is read, ready for the next packet */
 201                                 Pipe_ClearIN();
 202                         }
 203
 204                         /* Re-freeze IN pipe after use */
 205                         Pipe_Freeze();
 206
 207                         /* Select and unfreeze the notification pipe */
 208                         Pipe_SelectPipe(CDC_NOTIFICATION_PIPE);
 209                         Pipe_Unfreeze();
 210
 211                         /* Check if a packet has been received */
 212                         if (Pipe_IsINReceived())
 213                         {
 214                                 /* Discard the unused event notification */
 215                                 Pipe_ClearIN();
 216                         }
 217
 218                         /* Freeze notification IN pipe after use */
 219                         Pipe_Freeze();
 220
 221                         break;
 222         }
 223 }
 224