Demos/Host/LowLevel/VirtualSerialHost/VirtualSerialHost.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2012.
   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                 CDCHost_Task();
  54
  55                 USB_USBTask();
  56         }
  57 }
  58
  59 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  60 void SetupHardware(void)
  61 {
  62         /* Disable watchdog if enabled by bootloader/fuses */
  63         MCUSR &= ~(1 << WDRF);
  64         wdt_disable();
  65
  66         /* Disable clock division */
  67         clock_prescale_set(clock_div_1);
  68
  69         /* Hardware Initialization */
  70         Serial_Init(9600, false);
  71         LEDs_Init();
  72         USB_Init();
  73
  74         /* Create a stdio stream for the serial port for stdin and stdout */
  75         Serial_CreateStream(NULL);
  76 }
  77
  78 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
  79  *  starts the library USB task to begin the enumeration and USB management process.
  80  */
  81 void EVENT_USB_Host_DeviceAttached(void)
  82 {
  83         puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
  84         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  85 }
  86
  87 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
  88  *  stops the library USB task management process.
  89  */
  90 void EVENT_USB_Host_DeviceUnattached(void)
  91 {
  92         puts_P(PSTR(ESC_FG_GREEN "\r\nDevice Unattached.\r\n" ESC_FG_WHITE));
  93         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  94 }
  95
  96 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
  97  *  enumerated by the host and is now ready to be used by the application.
  98  */
  99 void EVENT_USB_Host_DeviceEnumerationComplete(void)
 100 {
 101         puts_P(PSTR("Getting Config Data.\r\n"));
 102
 103         uint8_t ErrorCode;
 104
 105         /* Get and process the configuration descriptor data */
 106         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 107         {
 108                 if (ErrorCode == ControlError)
 109                   puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
 110                 else
 111                   puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
 112
 113                 printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 114
 115                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 116                 return;
 117         }
 118
 119         /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
 120         if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
 121         {
 122                 printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
 123                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 124
 125                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 126                 return;
 127         }
 128
 129         puts_P(PSTR("CDC Device Enumerated.\r\n"));
 130         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 131 }
 132
 133 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 134 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 135 {
 136         USB_Disable();
 137
 138         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 139                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 140
 141         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 142         for(;;);
 143 }
 144
 145 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 146  *  enumerating an attached USB device.
 147  */
 148 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 149                                             const uint8_t SubErrorCode)
 150 {
 151         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 152                                  " -- Error Code %d\r\n"
 153                                  " -- Sub Error Code %d\r\n"
 154                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 155
 156         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 157 }
 158
 159 /** Task to read in data received from the attached CDC device and print it to the serial port.
 160  */
 161 void CDCHost_Task(void)
 162 {
 163         if (USB_HostState != HOST_STATE_Configured)
 164           return;
 165
 166         /* Select the data IN pipe */
 167         Pipe_SelectPipe(CDC_DATA_IN_PIPE);
 168         Pipe_Unfreeze();
 169
 170         /* Check to see if a packet has been received */
 171         if (Pipe_IsINReceived())
 172         {
 173                 /* Re-freeze IN pipe after the packet has been received */
 174                 Pipe_Freeze();
 175
 176                 /* Check if data is in the pipe */
 177                 if (Pipe_IsReadWriteAllowed())
 178                 {
 179                         /* Get the length of the pipe data, and create a new buffer to hold it */
 180                         uint16_t BufferLength = Pipe_BytesInPipe();
 181                         uint8_t  Buffer[BufferLength];
 182
 183                         /* Read in the pipe data to the temporary buffer */
 184                         Pipe_Read_Stream_LE(Buffer, BufferLength, NULL);
 185
 186                         /* Print out the buffer contents to the USART */
 187                         for (uint16_t BufferByte = 0; BufferByte < BufferLength; BufferByte++)
 188                           putchar(Buffer[BufferByte]);
 189                 }
 190
 191                 /* Clear the pipe after it is read, ready for the next packet */
 192                 Pipe_ClearIN();
 193         }
 194
 195         /* Re-freeze IN pipe after use */
 196         Pipe_Freeze();
 197
 198         /* Select and unfreeze the notification pipe */
 199         Pipe_SelectPipe(CDC_NOTIFICATION_PIPE);
 200         Pipe_Unfreeze();
 201
 202         /* Check if a packet has been received */
 203         if (Pipe_IsINReceived())
 204         {
 205                 /* Discard the unused event notification */
 206                 Pipe_ClearIN();
 207         }
 208
 209         /* Freeze notification IN pipe after use */
 210         Pipe_Freeze();
 211 }
 212