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_Device_t VirtualSerial_CDC_Interface =
  50         {
  51                 .Config =
  52                         {
  53                                 .ControlInterfaceNumber     = 0,
  54
  55                                 .DataINEndpointNumber       = CDC_TX_EPNUM,
  56                                 .DataINEndpointSize         = CDC_TXRX_EPSIZE,
  57
  58                                 .DataOUTEndpointNumber      = CDC_RX_EPNUM,
  59                                 .DataOUTEndpointSize        = CDC_TXRX_EPSIZE,
  60
  61                                 .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
  62                                 .NotificationEndpointSize   = CDC_NOTIFICATION_EPSIZE,
  63                         },
  64         };
  65
  66 /** Main program entry point. This routine contains the overall program flow, including initial
  67  *  setup of all components and the main program loop.
  68  */
  69 int main(void)
  70 {
  71         SetupHardware();
  72
  73         Buffer_Initialize(&Rx_Buffer);
  74         Buffer_Initialize(&Tx_Buffer);
  75
  76         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  77
  78         for (;;)
  79         {
  80                 /* Read bytes from the USB OUT endpoint into the USART transmit buffer */
  81                 for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
  82                 {
  83                         if (!(BUFF_STATICSIZE - Rx_Buffer.Elements))
  84                           break;
  85
  86                         Buffer_StoreElement(&Rx_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
  87                 }
  88
  89                 /* Read bytes from the USART receive buffer into the USB IN endpoint */
  90                 if (Tx_Buffer.Elements)
  91                   CDC_Device_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&Tx_Buffer));
  92
  93                 /* Load bytes from the USART transmit buffer into the USART */
  94                 if (Rx_Buffer.Elements)
  95                   Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
  96
  97                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
  98                 USB_USBTask();
  99         }
 100 }
 101
 102 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 103 void SetupHardware(void)
 104 {
 105         /* Disable watchdog if enabled by bootloader/fuses */
 106         MCUSR &= ~(1 << WDRF);
 107         wdt_disable();
 108
 109         /* Disable clock division */
 110         clock_prescale_set(clock_div_1);
 111
 112         /* Hardware Initialization */
 113         Joystick_Init();
 114         LEDs_Init();
 115         USB_Init();
 116 }
 117
 118 /** Event handler for the library USB Connection event. */
 119 void EVENT_USB_Device_Connect(void)
 120 {
 121         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 122 }
 123
 124 /** Event handler for the library USB Disconnection event. */
 125 void EVENT_USB_Device_Disconnect(void)
 126 {
 127         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 128 }
 129
 130 /** Event handler for the library USB Configuration Changed event. */
 131 void EVENT_USB_Device_ConfigurationChanged(void)
 132 {
 133         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 134
 135         if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 136           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 137 }
 138
 139 /** Event handler for the library USB Unhandled Control Request event. */
 140 void EVENT_USB_Device_UnhandledControlPacket(void)
 141 {
 142         CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 143 }
 144
 145 /** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer
 146  *  for later transmission to the host.
 147  */
 148 ISR(USART1_RX_vect, ISR_BLOCK)
 149 {
 150         if (USB_DeviceState == DEVICE_STATE_Configured)
 151           Buffer_StoreElement(&Tx_Buffer, UDR1);
 152 }
 153
 154 /** Event handler for the CDC Class driver Line Encoding Changed event.
 155  *
 156  *  \param[in] CDCInterfaceInfo  Pointer to the CDC class interface configuration structure being referenced
 157  */
 158 void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 159 {
 160         uint8_t ConfigMask = 0;
 161
 162         switch (CDCInterfaceInfo->State.LineEncoding.ParityType)
 163         {
 164                 case CDC_PARITY_Odd:
 165                         ConfigMask = ((1 << UPM11) | (1 << UPM10));
 166                         break;
 167                 case CDC_PARITY_Even:
 168                         ConfigMask = (1 << UPM11);
 169                         break;
 170         }
 171
 172         if (CDCInterfaceInfo->State.LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
 173           ConfigMask |= (1 << USBS1);
 174
 175         switch (CDCInterfaceInfo->State.LineEncoding.DataBits)
 176         {
 177                 case 6:
 178                         ConfigMask |= (1 << UCSZ10);
 179                         break;
 180                 case 7:
 181                         ConfigMask |= (1 << UCSZ11);
 182                         break;
 183                 case 8:
 184                         ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
 185                         break;
 186         }
 187
 188         UCSR1A = (1 << U2X1);
 189         UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
 190         UCSR1C = ConfigMask;
 191         UBRR1  = SERIAL_2X_UBBRVAL((uint16_t)CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
 192 }