Demos/Device/USBtoSerial/USBtoSerial.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 USBtoSerial demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "USBtoSerial.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 Rx_Buffer;
  41
  42 /** Circular buffer to hold data from the serial port before it is sent to the host. */
  43 RingBuff_t Tx_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_t VirtualSerial_CDC_Interface =
  50         {
  51                 .ControlInterfaceNumber     = 0,
  52
  53                 .DataINEndpointNumber       = CDC_TX_EPNUM,
  54                 .DataINEndpointSize         = CDC_TXRX_EPSIZE,
  55
  56                 .DataOUTEndpointNumber      = CDC_RX_EPNUM,
  57                 .DataOUTEndpointSize        = CDC_TXRX_EPSIZE,
  58
  59                 .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
  60                 .NotificationEndpointSize   = CDC_NOTIFICATION_EPSIZE,
  61         };
  62
  63 /** Main program entry point. This routine contains the overall program flow, including initial
  64  *  setup of all components and the main program loop.
  65  */
  66 int main(void)
  67 {
  68         SetupHardware();
  69
  70         Buffer_Initialize(&Rx_Buffer);
  71         Buffer_Initialize(&Tx_Buffer);
  72
  73         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  74
  75         for (;;)
  76         {
  77                 for (uint8_t DataBytesRem = USB_CDC_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
  78                 {
  79                         if (!(BUFF_STATICSIZE - Rx_Buffer.Elements))
  80                           break;
  81
  82                         Buffer_StoreElement(&Rx_Buffer, USB_CDC_ReceiveByte(&VirtualSerial_CDC_Interface));
  83                 }
  84
  85                 if (Tx_Buffer.Elements)
  86                   USB_CDC_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&Rx_Buffer));
  87
  88                 if (Rx_Buffer.Elements)
  89                   Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
  90
  91                 USB_CDC_USBTask(&VirtualSerial_CDC_Interface);
  92                 USB_USBTask();
  93         }
  94 }
  95
  96 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  97 void SetupHardware(void)
  98 {
  99         /* Disable watchdog if enabled by bootloader/fuses */
 100         MCUSR &= ~(1 << WDRF);
 101         wdt_disable();
 102
 103         /* Disable clock division */
 104         clock_prescale_set(clock_div_1);
 105
 106         /* Hardware Initialization */
 107         Joystick_Init();
 108         LEDs_Init();
 109         USB_Init();
 110 }
 111
 112 /** Event handler for the library USB Connection event. */
 113 void EVENT_USB_Connect(void)
 114 {
 115         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 116 }
 117
 118 /** Event handler for the library USB Disconnection event. */
 119 void EVENT_USB_Disconnect(void)
 120 {
 121         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 122 }
 123
 124 /** Event handler for the library USB Configuration Changed event. */
 125 void EVENT_USB_ConfigurationChanged(void)
 126 {
 127         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 128
 129         if (!(USB_CDC_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 130           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 131 }
 132
 133 /** Event handler for the library USB Unhandled Control Packet event. */
 134 void EVENT_USB_UnhandledControlPacket(void)
 135 {
 136         USB_CDC_ProcessControlPacket(&VirtualSerial_CDC_Interface);
 137 }
 138
 139 /** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer
 140  *  for later transmission to the host.
 141  */
 142 ISR(USART1_RX_vect, ISR_BLOCK)
 143 {
 144         if (USB_IsConnected)
 145           Buffer_StoreElement(&Tx_Buffer, UDR1);
 146 }
 147
 148 /** Event handler for the CDC Class driver Line Encoding Changed event.
 149  *
 150  *  \param CDCInterfaceInfo  Pointer to the CDC class interface configuration structure being referenced
 151  */
 152 void EVENT_USB_CDC_LineEncodingChanged(USB_ClassInfo_CDC_t* CDCInterfaceInfo)
 153 {
 154         uint8_t ConfigMask = 0;
 155
 156         if (CDCInterfaceInfo->LineEncoding.ParityType == CDC_PARITY_Odd)
 157           ConfigMask = ((1 << UPM11) | (1 << UPM10));
 158         else if (CDCInterfaceInfo->LineEncoding.ParityType == CDC_PARITY_Even)
 159           ConfigMask = (1 << UPM11);
 160
 161         if (CDCInterfaceInfo->LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
 162           ConfigMask |= (1 << USBS1);
 163
 164         if (CDCInterfaceInfo->LineEncoding.DataBits == 6)
 165           ConfigMask |= (1 << UCSZ10);
 166         else if (CDCInterfaceInfo->LineEncoding.DataBits == 7)
 167           ConfigMask |= (1 << UCSZ11);
 168         else if (CDCInterfaceInfo->LineEncoding.DataBits == 8)
 169           ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
 170
 171         UCSR1A = (1 << U2X1);
 172         UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
 173         UCSR1C = ConfigMask;
 174         UBRR1  = SERIAL_2X_UBBRVAL((uint16_t)CDCInterfaceInfo->LineEncoding.BaudRateBPS);
 175 }