Projects/XPLAINBridge/XPLAINBridge.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   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 XPLAINBridge project. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "XPLAINBridge.h"
  38
  39 /** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
  40 RingBuff_t USBtoUART_Buffer;
  41
  42 /** Circular buffer to hold data from the serial port before it is sent to the host. */
  43 RingBuff_t UARTtoUSB_Buffer;
  44
  45 /** LUFA CDC Class driver interface configuration and state information. This structure is
  46  *  passed to all CDC Class driver functions, so that multiple instances of the same class
  47  *  within a device can be differentiated from one another.
  48  */
  49 USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  50         {
  51                 .Config =
  52                         {
  53                                 .ControlInterfaceNumber         = 0,
  54
  55                                 .DataINEndpointNumber           = CDC_TX_EPNUM,
  56                                 .DataINEndpointSize             = CDC_TXRX_EPSIZE,
  57                                 .DataINEndpointDoubleBank       = false,
  58
  59                                 .DataOUTEndpointNumber          = CDC_RX_EPNUM,
  60                                 .DataOUTEndpointSize            = CDC_TXRX_EPSIZE,
  61                                 .DataOUTEndpointDoubleBank      = false,
  62
  63                                 .NotificationEndpointNumber     = CDC_NOTIFICATION_EPNUM,
  64                                 .NotificationEndpointSize       = CDC_NOTIFICATION_EPSIZE,
  65                                 .NotificationEndpointDoubleBank = false,
  66                         },
  67         };
  68
  69 /** Main program entry point. This routine contains the overall program flow, including initial
  70  *  setup of all components and the main program loop.
  71  */
  72 int main(void)
  73 {
  74         SetupHardware();
  75
  76         Buffer_Initialize(&USBtoUART_Buffer);
  77         Buffer_Initialize(&UARTtoUSB_Buffer);
  78
  79         for (;;)
  80         {
  81                 /* Read bytes from the USB OUT endpoint into the UART transmit buffer */
  82                 for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
  83                 {
  84                         if (!(BUFF_STATICSIZE - USBtoUART_Buffer.Elements))
  85                           break;
  86
  87                         Buffer_StoreElement(&USBtoUART_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
  88                 }
  89
  90                 /* Read bytes from the UART receive buffer into the USB IN endpoint */
  91                 if (UARTtoUSB_Buffer.Elements)
  92                   CDC_Device_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&UARTtoUSB_Buffer));
  93
  94                 /* Load bytes from the UART transmit buffer into the UART */
  95                 if ((USBtoUART_Buffer.Elements) && SoftUART_IsReady())
  96                   SoftUART_TxByte(Buffer_GetElement(&USBtoUART_Buffer));
  97
  98                 /* Load bytes from the UART into the UART receive buffer */
  99                 if(SoftUART_IsReceived())
 100                         Buffer_StoreElement(&UARTtoUSB_Buffer, SoftUART_RxByte());
 101
 102                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
 103                 USB_USBTask();
 104         }
 105 }
 106
 107 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 108 void SetupHardware(void)
 109 {
 110         /* Disable watchdog if enabled by bootloader/fuses */
 111         MCUSR &= ~(1 << WDRF);
 112         wdt_disable();
 113
 114         /* Disable clock division */
 115         clock_prescale_set(clock_div_1);
 116
 117         /* Hardware Initialization */
 118         SoftUART_Init();
 119         LEDs_Init();
 120         USB_Init();
 121
 122         PORTD |= (1 << 5); // PD5 is connected to the XMEGA /RESET, enable pullup
 123 }
 124
 125 /** Event handler for the library USB Configuration Changed event. */
 126 void EVENT_USB_Device_ConfigurationChanged(void)
 127 {
 128         LEDs_SetAllLEDs(LEDS_LED1);
 129
 130         if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 131                 LEDs_SetAllLEDs(LEDS_NO_LEDS);
 132 }
 133
 134 /** Event handler for the library USB Unhandled Control Request event. */
 135 void EVENT_USB_Device_UnhandledControlRequest(void)
 136 {
 137         CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 138 }