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   Copyright 2009  John Steggall (steggall.j@gmail.com)
  12
  13   Permission to use, copy, modify, and distribute this software
  14   and its documentation for any purpose and without fee is hereby
  15   granted, provided that the above copyright notice appear in all
  16   copies and that both that the copyright notice and this
  17   permission notice and warranty disclaimer appear in supporting
  18   documentation, and that the name of the author not be used in
  19   advertising or publicity pertaining to distribution of the
  20   software without specific, written prior permission.
  21
  22   The author disclaim all warranties with regard to this
  23   software, including all implied warranties of merchantability
  24   and fitness.  In no event shall the author be liable for any
  25   special, indirect or consequential damages or any damages
  26   whatsoever resulting from loss of use, data or profits, whether
  27   in an action of contract, negligence or other tortious action,
  28   arising out of or in connection with the use or performance of
  29   this software.
  30 */
  31
  32 /** \file
  33  *
  34  *  Main source file for the XPLAINBridge project. This file contains the main tasks of
  35  *  the demo and is responsible for the initial application hardware configuration.
  36  */
  37
  38 #include "XPLAINBridge.h"
  39
  40 /** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
  41 RingBuff_t USBtoUART_Buffer;
  42
  43 /** Circular buffer to hold data from the serial port before it is sent to the host. */
  44 RingBuff_t UARTtoUSB_Buffer;
  45
  46 /** LUFA CDC Class driver interface configuration and state information. This structure is
  47  *  passed to all CDC Class driver functions, so that multiple instances of the same class
  48  *  within a device can be differentiated from one another.
  49  */
  50 USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  51         {
  52                 .Config =
  53                         {
  54                                 .ControlInterfaceNumber         = 0,
  55
  56                                 .DataINEndpointNumber           = CDC_TX_EPNUM,
  57                                 .DataINEndpointSize             = CDC_TXRX_EPSIZE,
  58                                 .DataINEndpointDoubleBank       = false,
  59
  60                                 .DataOUTEndpointNumber          = CDC_RX_EPNUM,
  61                                 .DataOUTEndpointSize            = CDC_TXRX_EPSIZE,
  62                                 .DataOUTEndpointDoubleBank      = false,
  63
  64                                 .NotificationEndpointNumber     = CDC_NOTIFICATION_EPNUM,
  65                                 .NotificationEndpointSize       = CDC_NOTIFICATION_EPSIZE,
  66                                 .NotificationEndpointDoubleBank = false,
  67                         },
  68         };
  69
  70 /** Main program entry point. This routine contains the overall program flow, including initial
  71  *  setup of all components and the main program loop.
  72  */
  73 int main(void)
  74 {
  75         SetupHardware();
  76
  77         Buffer_Initialize(&USBtoUART_Buffer);
  78         Buffer_Initialize(&UARTtoUSB_Buffer);
  79
  80         for (;;)
  81         {
  82                 /* Read bytes from the USB OUT endpoint into the UART transmit buffer */
  83                 for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
  84                 {
  85                         if (!(BUFF_STATICSIZE - USBtoUART_Buffer.Elements))
  86                           break;
  87
  88                         Buffer_StoreElement(&USBtoUART_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
  89                 }
  90
  91                 /* Read bytes from the UART receive buffer into the USB IN endpoint */
  92                 if (UARTtoUSB_Buffer.Elements)
  93                   CDC_Device_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&UARTtoUSB_Buffer));
  94
  95                 /* Load bytes from the UART transmit buffer into the UART */
  96                 if ((USBtoUART_Buffer.Elements) && SoftUART_IsReady())
  97                   SoftUART_TxByte(Buffer_GetElement(&USBtoUART_Buffer));
  98
  99                 /* Load bytes from the UART into the UART receive buffer */
 100                 if(SoftUART_IsReceived())
 101                         Buffer_StoreElement(&UARTtoUSB_Buffer, SoftUART_RxByte());
 102
 103                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
 104                 USB_USBTask();
 105         }
 106 }
 107
 108 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 109 void SetupHardware(void)
 110 {
 111         /* Disable watchdog if enabled by bootloader/fuses */
 112         MCUSR &= ~(1 << WDRF);
 113         wdt_disable();
 114
 115         /* Disable clock division */
 116         clock_prescale_set(clock_div_1);
 117
 118         /* Hardware Initialization */
 119         SoftUART_Init();
 120         LEDs_Init();
 121         USB_Init();
 122 }
 123
 124 /** Event handler for the library USB Configuration Changed event. */
 125 void EVENT_USB_Device_ConfigurationChanged(void)
 126 {
 127         LEDs_SetAllLEDs(LEDS_LED1);
 128
 129         if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 130                 LEDs_SetAllLEDs(LEDS_NO_LEDS);
 131 }
 132
 133 /** Event handler for the library USB Unhandled Control Request event. */
 134 void EVENT_USB_Device_UnhandledControlRequest(void)
 135 {
 136         CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 137 }