Projects/Benito/Benito.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 Benito project. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "Benito.h"
  38
  39 /** Counter for the number of milliseconds remaining for the target /RESET pulse being generated. */
  40 volatile uint8_t ResetPulseMSRemaining = 0;
  41
  42 /** Counter for the number of milliseconds remaining for the TX activity LED pulse being generated. */
  43 volatile uint8_t TxPulseMSRemaining    = 0;
  44
  45 /** Counter for the number of milliseconds remaining for the RX activity LED pulse being generated. */
  46 volatile uint8_t RxPulseMSRemaining    = 0;
  47
  48 /** Counter for the number of milliseconds remaining for the enumeration LED ping-pong being generated. */
  49 volatile uint8_t PingPongMSRemaining   = 0;
  50
  51 /** LUFA CDC Class driver interface configuration and state information. This structure is
  52  *  passed to all CDC Class driver functions, so that multiple instances of the same class
  53  *  within a device can be differentiated from one another.
  54  */
  55 USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  56         {
  57                 .Config =
  58                         {
  59                                 .ControlInterfaceNumber     = 0,
  60
  61                                 .DataINEndpointNumber       = CDC_TX_EPNUM,
  62                                 .DataINEndpointSize         = CDC_TXRX_EPSIZE,
  63
  64                                 .DataOUTEndpointNumber      = CDC_RX_EPNUM,
  65                                 .DataOUTEndpointSize        = CDC_TXRX_EPSIZE,
  66
  67                                 .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
  68                                 .NotificationEndpointSize   = CDC_NOTIFICATION_EPSIZE,
  69                         },
  70
  71                 .State =
  72                         {
  73                                 // Leave all state values to their defaults
  74                         }
  75         };
  76
  77 /** Main program entry point. This routine contains the overall program flow, including initial
  78  *  setup of all components and the main program loop.
  79  */
  80 int main(void)
  81 {
  82         SetupHardware();
  83
  84         for (;;)
  85         {
  86                 /* Echo bytes from the host to the target via the hardware USART */
  87                 if (CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface))
  88                 {
  89                         Serial_TxByte(CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
  90
  91                         LEDs_TurnOnLEDs(LEDMASK_TX);
  92                         TxPulseMSRemaining = TX_RX_LED_PULSE_MS;
  93                 }
  94
  95                 /* Echo bytes from the target to the host via the virtual serial port */
  96                 if (Serial_IsCharReceived())
  97                 {
  98                         CDC_Device_SendByte(&VirtualSerial_CDC_Interface, Serial_RxByte());
  99
 100                         LEDs_TurnOnLEDs(LEDMASK_RX);
 101                         RxPulseMSRemaining = TX_RX_LED_PULSE_MS;
 102                 }
 103
 104                 /* Check if the millisecond timer has elapsed */
 105                 if (TIFR0 & (1 << OCF0A))
 106                 {
 107                         /* Check if the LEDs should be ping-ponging (during enumeration) */
 108                         if (PingPongMSRemaining && !(--PingPongMSRemaining))
 109                         {
 110                                 LEDs_ToggleLEDs(LEDMASK_BUSY);
 111                                 PingPongMSRemaining = PING_PONG_LED_PULSE_MS;
 112                         }
 113
 114                         /* Check if the reset pulse period has elapsed, if so tristate the target reset line */
 115                         if (ResetPulseMSRemaining && !(--ResetPulseMSRemaining))
 116                         {
 117                                 LEDs_TurnOffLEDs(LEDMASK_BUSY);
 118                                 AVR_RESET_LINE_DDR &= ~AVR_RESET_LINE_MASK;
 119                         }
 120
 121                         /* Turn off TX LED(s) once the TX pulse period has elapsed */
 122                         if (TxPulseMSRemaining && !(--TxPulseMSRemaining))
 123                           LEDs_TurnOffLEDs(LEDMASK_TX);
 124
 125                         /* Turn off RX LED(s) once the RX pulse period has elapsed */
 126                         if (RxPulseMSRemaining && !(--RxPulseMSRemaining))
 127                           LEDs_TurnOffLEDs(LEDMASK_RX);
 128
 129                         /* Clear the millisecond timer CTC flag (cleared by writing logic one to the register) */
 130                         TIFR0 |= (1 << OCF0A);
 131                 }
 132
 133                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
 134                 USB_USBTask();
 135         }
 136 }
 137
 138 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 139 void SetupHardware(void)
 140 {
 141         /* Disable watchdog if enabled by bootloader/fuses */
 142         MCUSR &= ~(1 << WDRF);
 143         wdt_disable();
 144
 145         /* Disable clock division */
 146         clock_prescale_set(clock_div_1);
 147
 148         /* Hardware Initialization */
 149         LEDs_Init();
 150         USB_Init();
 151
 152         /* Millisecond Timer Interrupt */
 153         OCR0A  = (F_CPU / 64 / 1000);
 154         TCCR0A = (1 << WGM01);
 155         TCCR0B = ((1 << CS01) | (1 << CS00));
 156
 157         /* Tristate target /RESET Line */
 158         AVR_RESET_LINE_PORT &= ~AVR_RESET_LINE_MASK;
 159         AVR_RESET_LINE_DDR  &= ~AVR_RESET_LINE_MASK;
 160 }
 161
 162 /** Event handler for the library USB Connection event. */
 163 void EVENT_USB_Connect(void)
 164 {
 165         PingPongMSRemaining = PING_PONG_LED_PULSE_MS;
 166         LEDs_SetAllLEDs(LEDMASK_TX);
 167 }
 168
 169 /** Event handler for the library USB Disconnection event. */
 170 void EVENT_USB_Disconnect(void)
 171 {
 172         PingPongMSRemaining = 0;
 173         LEDs_TurnOffLEDs(LEDMASK_BUSY);
 174 }
 175
 176 /** Event handler for the library USB Configuration Changed event. */
 177 void EVENT_USB_ConfigurationChanged(void)
 178 {
 179         PingPongMSRemaining = 0;
 180         LEDs_TurnOffLEDs(LEDMASK_BUSY);
 181
 182         if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 183           LEDs_TurnOnLEDs(LEDMASK_ERROR);
 184 }
 185
 186 /** Event handler for the library USB Unhandled Control Packet event. */
 187 void EVENT_USB_UnhandledControlPacket(void)
 188 {
 189         CDC_Device_ProcessControlPacket(&VirtualSerial_CDC_Interface);
 190 }
 191
 192 /** Event handler for the CDC Class driver Line Encoding Changed event.
 193  *
 194  *  \param[in] CDCInterfaceInfo  Pointer to the CDC class interface configuration structure being referenced
 195  */
 196 void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 197 {
 198         uint8_t ConfigMask = 0;
 199
 200         switch (CDCInterfaceInfo->State.LineEncoding.ParityType)
 201         {
 202                 case CDC_PARITY_Odd:
 203                         ConfigMask = ((1 << UPM11) | (1 << UPM10));
 204                         break;
 205                 case CDC_PARITY_Even:
 206                         ConfigMask = (1 << UPM11);
 207                         break;
 208         }
 209
 210         if (CDCInterfaceInfo->State.LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
 211           ConfigMask |= (1 << USBS1);
 212
 213         switch (CDCInterfaceInfo->State.LineEncoding.DataBits)
 214         {
 215                 case 6:
 216                         ConfigMask |= (1 << UCSZ10);
 217                         break;
 218                 case 7:
 219                         ConfigMask |= (1 << UCSZ11);
 220                         break;
 221                 case 8:
 222                         ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
 223                         break;
 224         }
 225
 226         UCSR1A = (1 << U2X1);
 227         UCSR1B = ((1 << TXEN1) | (1 << RXEN1));
 228         UCSR1C = ConfigMask;
 229         UBRR1  = SERIAL_2X_UBBRVAL((uint16_t)CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
 230 }
 231
 232 /** Event handler for the CDC Class driver Host-to-Device Line Encoding Changed event.
 233  *
 234  *  \param[in] CDCInterfaceInfo  Pointer to the CDC class interface configuration structure being referenced
 235  */
 236 void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 237 {
 238         /* Check if the DTR line has been asserted - if so, start the target AVR's reset pulse */
 239         if (CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR)
 240         {
 241                 LEDs_TurnOnLEDs(LEDMASK_BUSY);
 242
 243                 AVR_RESET_LINE_DDR |= AVR_RESET_LINE_MASK;
 244                 ResetPulseMSRemaining = AVR_RESET_PULSE_MS;
 245         }
 246 }