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 #include "USBtoSerial.h"
  32
  33 RingBuff_t Rx_Buffer;
  34 RingBuff_t Tx_Buffer;
  35
  36 USB_ClassInfo_CDC_t VirtualSerial_CDC_Interface =
  37         {
  38                 .ControlInterfaceNumber     = 0,
  39
  40                 .DataINEndpointNumber       = CDC_TX_EPNUM,
  41                 .DataINEndpointSize         = CDC_TXRX_EPSIZE,
  42
  43                 .DataOUTEndpointNumber      = CDC_RX_EPNUM,
  44                 .DataOUTEndpointSize        = CDC_TXRX_EPSIZE,
  45
  46                 .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
  47                 .NotificationEndpointSize   = CDC_NOTIFICATION_EPSIZE,
  48         };
  49
  50 int main(void)
  51 {
  52         SetupHardware();
  53
  54         Buffer_Initialize(&Rx_Buffer);
  55         Buffer_Initialize(&Tx_Buffer);
  56
  57         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  58
  59         for (;;)
  60         {
  61                 for (uint8_t DataBytesRem = USB_CDC_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
  62                 {
  63                         if (!(BUFF_STATICSIZE - Rx_Buffer.Elements))
  64                           break;
  65
  66                         Buffer_StoreElement(&Rx_Buffer, USB_CDC_ReceiveByte(&VirtualSerial_CDC_Interface));
  67                 }
  68
  69                 if (Tx_Buffer.Elements)
  70                   USB_CDC_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&Rx_Buffer));
  71
  72                 if (Rx_Buffer.Elements)
  73                   Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
  74
  75                 USB_CDC_USBTask(&VirtualSerial_CDC_Interface);
  76                 USB_USBTask();
  77         }
  78 }
  79
  80 void SetupHardware(void)
  81 {
  82         /* Disable watchdog if enabled by bootloader/fuses */
  83         MCUSR &= ~(1 << WDRF);
  84         wdt_disable();
  85
  86         /* Disable clock division */
  87         clock_prescale_set(clock_div_1);
  88
  89         /* Hardware Initialization */
  90         Joystick_Init();
  91         LEDs_Init();
  92         USB_Init();
  93 }
  94
  95 void EVENT_USB_Connect(void)
  96 {
  97         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  98 }
  99
 100 void EVENT_USB_Disconnect(void)
 101 {
 102         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 103 }
 104
 105 void EVENT_USB_ConfigurationChanged(void)
 106 {
 107         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 108
 109         if (!(USB_CDC_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 110           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 111 }
 112
 113 void EVENT_USB_UnhandledControlPacket(void)
 114 {
 115         USB_CDC_ProcessControlPacket(&VirtualSerial_CDC_Interface);
 116 }
 117
 118 ISR(USART1_RX_vect, ISR_BLOCK)
 119 {
 120         if (USB_IsConnected)
 121           Buffer_StoreElement(&Tx_Buffer, UDR1);
 122 }
 123
 124 void EVENT_USB_CDC_LineEncodingChanged(USB_ClassInfo_CDC_t* CDCInterfaceInfo)
 125 {
 126         uint8_t ConfigMask = 0;
 127
 128         if (CDCInterfaceInfo->LineEncoding.ParityType == Parity_Odd)
 129           ConfigMask = ((1 << UPM11) | (1 << UPM10));
 130         else if (CDCInterfaceInfo->LineEncoding.ParityType == Parity_Even)
 131           ConfigMask = (1 << UPM11);
 132
 133         if (CDCInterfaceInfo->LineEncoding.CharFormat == TwoStopBits)
 134           ConfigMask |= (1 << USBS1);
 135
 136         if (CDCInterfaceInfo->LineEncoding.DataBits == 6)
 137           ConfigMask |= (1 << UCSZ10);
 138         else if (CDCInterfaceInfo->LineEncoding.DataBits == 7)
 139           ConfigMask |= (1 << UCSZ11);
 140         else if (CDCInterfaceInfo->LineEncoding.DataBits == 8)
 141           ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
 142
 143         UCSR1A = (1 << U2X1);
 144         UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
 145         UCSR1C = ConfigMask;
 146         UBRR1  = SERIAL_2X_UBBRVAL((uint16_t)CDCInterfaceInfo->LineEncoding.BaudRateBPS);
 147 }