Demos/Device/ClassDriver/VirtualSerial/VirtualSerial.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 VirtualSerial demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "VirtualSerial.h"
  38
  39 /** LUFA CDC Class driver interface configuration and state information. This structure is
  40  *  passed to all CDC Class driver functions, so that multiple instances of the same class
  41  *  within a device can be differentiated from one another.
  42  */
  43 USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  44         {
  45                 .Config =
  46                         {
  47                                 .ControlInterfaceNumber         = 0,
  48
  49                                 .DataINEndpointNumber           = CDC_TX_EPNUM,
  50                                 .DataINEndpointSize             = CDC_TXRX_EPSIZE,
  51                                 .DataINEndpointDoubleBank       = false,
  52
  53                                 .DataOUTEndpointNumber          = CDC_RX_EPNUM,
  54                                 .DataOUTEndpointSize            = CDC_TXRX_EPSIZE,
  55                                 .DataOUTEndpointDoubleBank      = false,
  56
  57                                 .NotificationEndpointNumber     = CDC_NOTIFICATION_EPNUM,
  58                                 .NotificationEndpointSize       = CDC_NOTIFICATION_EPSIZE,
  59                                 .NotificationEndpointDoubleBank = false,
  60                         },
  61         };
  62
  63 /** Standard file stream for the CDC interface when set up, so that the virtual CDC COM port can be
  64  *  used like any regular character stream in the C APIs
  65  */
  66 static FILE USBSerialStream;
  67
  68 /** Main program entry point. This routine contains the overall program flow, including initial
  69  *  setup of all components and the main program loop.
  70  */
  71 int main(void)
  72 {
  73         SetupHardware();
  74
  75         /* Create a regular character stream for the interface so that it can be used with the stdio.h functions */
  76         CDC_Device_CreateStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
  77
  78         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  79
  80         for (;;)
  81         {
  82                 CheckJoystickMovement();
  83
  84                 /* Must throw away unused bytes from the host, or it will lock up while waiting for the device */
  85                 while (CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface))
  86                   CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
  87
  88                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
  89                 USB_USBTask();
  90         }
  91 }
  92
  93 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  94 void SetupHardware(void)
  95 {
  96         /* Disable watchdog if enabled by bootloader/fuses */
  97         MCUSR &= ~(1 << WDRF);
  98         wdt_disable();
  99
 100         /* Disable clock division */
 101         clock_prescale_set(clock_div_1);
 102
 103         /* Hardware Initialization */
 104         Joystick_Init();
 105         LEDs_Init();
 106         USB_Init();
 107 }
 108
 109 /** Checks for changes in the position of the board joystick, sending strings to the host upon each change. */
 110 void CheckJoystickMovement(void)
 111 {
 112         uint8_t     JoyStatus_LCL = Joystick_GetStatus();
 113         char*       ReportString  = NULL;
 114         static bool ActionSent    = false;
 115
 116         if (JoyStatus_LCL & JOY_UP)
 117           ReportString = "Joystick Up\r\n";
 118         else if (JoyStatus_LCL & JOY_DOWN)
 119           ReportString = "Joystick Down\r\n";
 120         else if (JoyStatus_LCL & JOY_LEFT)
 121           ReportString = "Joystick Left\r\n";
 122         else if (JoyStatus_LCL & JOY_RIGHT)
 123           ReportString = "Joystick Right\r\n";
 124         else if (JoyStatus_LCL & JOY_PRESS)
 125           ReportString = "Joystick Pressed\r\n";
 126         else
 127           ActionSent = false;
 128
 129         if ((ReportString != NULL) && (ActionSent == false))
 130         {
 131                 ActionSent = true;
 132
 133                 /* Write the string to the virtual COM port via the created character stream */
 134                 fputs(ReportString, &USBSerialStream);
 135
 136                 /* Alternatively, without the stream: */
 137                 // CDC_Device_SendString(&VirtualSerial_CDC_Interface, ReportString, strlen(ReportString));
 138         }
 139 }
 140
 141 /** Event handler for the library USB Connection event. */
 142 void EVENT_USB_Device_Connect(void)
 143 {
 144         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 145 }
 146
 147 /** Event handler for the library USB Disconnection event. */
 148 void EVENT_USB_Device_Disconnect(void)
 149 {
 150         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 151 }
 152
 153 /** Event handler for the library USB Configuration Changed event. */
 154 void EVENT_USB_Device_ConfigurationChanged(void)
 155 {
 156         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 157
 158         if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 159           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 160 }
 161
 162 /** Event handler for the library USB Unhandled Control Request event. */
 163 void EVENT_USB_Device_UnhandledControlRequest(void)
 164 {
 165         CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 166 }