Demos/Device/ClassDriver/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                 /* Read bytes from the USB OUT endpoint into the USART transmit buffer */
  78                 for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
  79                 {
  80                         if (!(BUFF_STATICSIZE - Rx_Buffer.Elements))
  81                           break;
  82
  83                         Buffer_StoreElement(&Rx_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
  84                 }
  85
  86                 /* Read bytes from the USART receive buffer into the USB IN endpoint */
  87                 if (Tx_Buffer.Elements)
  88                   CDC_Device_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&Tx_Buffer));
  89
  90                 /* Read bytes from the USART transmit buffer into the USART */
  91                 if (Rx_Buffer.Elements)
  92                   Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
  93
  94                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
  95                 USB_USBTask();
  96         }
  97 }
  98
  99 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 100 void SetupHardware(void)
 101 {
 102         /* Disable watchdog if enabled by bootloader/fuses */
 103         MCUSR &= ~(1 << WDRF);
 104         wdt_disable();
 105
 106         /* Disable clock division */
 107         clock_prescale_set(clock_div_1);
 108
 109         /* Hardware Initialization */
 110         Joystick_Init();
 111         LEDs_Init();
 112         USB_Init();
 113 }
 114
 115 /** Event handler for the library USB Connection event. */
 116 void EVENT_USB_Connect(void)
 117 {
 118         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 119 }
 120
 121 /** Event handler for the library USB Disconnection event. */
 122 void EVENT_USB_Disconnect(void)
 123 {
 124         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 125 }
 126
 127 /** Event handler for the library USB Configuration Changed event. */
 128 void EVENT_USB_ConfigurationChanged(void)
 129 {
 130         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 131
 132         if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 133           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 134 }
 135
 136 /** Event handler for the library USB Unhandled Control Packet event. */
 137 void EVENT_USB_UnhandledControlPacket(void)
 138 {
 139         CDC_Device_ProcessControlPacket(&VirtualSerial_CDC_Interface);
 140 }
 141
 142 /** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer
 143  *  for later transmission to the host.
 144  */
 145 ISR(USART1_RX_vect, ISR_BLOCK)
 146 {
 147         if (USB_IsConnected)
 148           Buffer_StoreElement(&Tx_Buffer, UDR1);
 149 }
 150
 151 /** Event handler for the CDC Class driver Line Encoding Changed event.
 152  *
 153  *  \param CDCInterfaceInfo  Pointer to the CDC class interface configuration structure being referenced
 154  */
 155 void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_t* CDCInterfaceInfo)
 156 {
 157         uint8_t ConfigMask = 0;
 158
 159         if (CDCInterfaceInfo->LineEncoding.ParityType == CDC_PARITY_Odd)
 160           ConfigMask = ((1 << UPM11) | (1 << UPM10));
 161         else if (CDCInterfaceInfo->LineEncoding.ParityType == CDC_PARITY_Even)
 162           ConfigMask = (1 << UPM11);
 163
 164         if (CDCInterfaceInfo->LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
 165           ConfigMask |= (1 << USBS1);
 166
 167         if (CDCInterfaceInfo->LineEncoding.DataBits == 6)
 168           ConfigMask |= (1 << UCSZ10);
 169         else if (CDCInterfaceInfo->LineEncoding.DataBits == 7)
 170           ConfigMask |= (1 << UCSZ11);
 171         else if (CDCInterfaceInfo->LineEncoding.DataBits == 8)
 172           ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
 173
 174         UCSR1A = (1 << U2X1);
 175         UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
 176         UCSR1C = ConfigMask;
 177         UBRR1  = SERIAL_2X_UBBRVAL((uint16_t)CDCInterfaceInfo->LineEncoding.BaudRateBPS);
 178 }