Projects/XPLAINBridge/XPLAINBridge.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all 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 XPLAINBridge project. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "XPLAINBridge.h"
  38
  39 /** Current firmware mode, making the device behave as either a programmer or a USART bridge */
  40 bool CurrentFirmwareMode = MODE_USART_BRIDGE;
  41
  42 /** LUFA CDC Class driver interface configuration and state information. This structure is
  43  *  passed to all CDC Class driver functions, so that multiple instances of the same class
  44  *  within a device can be differentiated from one another.
  45  */
  46 USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  47         {
  48                 .Config =
  49                         {
  50                                 .ControlInterfaceNumber         = 0,
  51
  52                                 .DataINEndpointNumber           = CDC_TX_EPNUM,
  53                                 .DataINEndpointSize             = CDC_TXRX_EPSIZE,
  54                                 .DataINEndpointDoubleBank       = true,
  55
  56                                 .DataOUTEndpointNumber          = CDC_RX_EPNUM,
  57                                 .DataOUTEndpointSize            = CDC_TXRX_EPSIZE,
  58                                 .DataOUTEndpointDoubleBank      = true,
  59
  60                                 .NotificationEndpointNumber     = CDC_NOTIFICATION_EPNUM,
  61                                 .NotificationEndpointSize       = CDC_NOTIFICATION_EPSIZE,
  62                                 .NotificationEndpointDoubleBank = false,
  63                         },
  64         };
  65
  66 /** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
  67 RingBuff_t USBtoUART_Buffer;
  68
  69 /** Circular buffer to hold data from the serial port before it is sent to the host. */
  70 RingBuff_t UARTtoUSB_Buffer;
  71
  72
  73 /** Main program entry point. This routine contains the overall program flow, including initial
  74  *  setup of all components and the main program loop.
  75  */
  76 int main(void)
  77 {
  78         SetupHardware();
  79
  80         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  81         sei();
  82
  83         for (;;)
  84         {
  85                 if (CurrentFirmwareMode == MODE_USART_BRIDGE)
  86                   UARTBridge_Task();
  87                 else
  88                   AVRISP_Task();
  89
  90                 USB_USBTask();
  91         }
  92 }
  93
  94 void AVRISP_Task(void)
  95 {
  96         /* Must be in the configured state for the AVRISP code to process data */
  97         if (USB_DeviceState != DEVICE_STATE_Configured)
  98           return;
  99
 100         V2Params_UpdateParamValues();
 101
 102         Endpoint_SelectEndpoint(AVRISP_DATA_OUT_EPNUM);
 103
 104         /* Check to see if a V2 Protocol command has been received */
 105         if (Endpoint_IsOUTReceived())
 106         {
 107                 LEDs_SetAllLEDs(LEDMASK_BUSY);
 108
 109                 /* Pass off processing of the V2 Protocol command to the V2 Protocol handler */
 110                 V2Protocol_ProcessCommand();
 111
 112                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 113         }
 114 }
 115
 116 void UARTBridge_Task(void)
 117 {
 118         /* Must be in the configured state for the USART Bridge code to process data */
 119         if (USB_DeviceState != DEVICE_STATE_Configured)
 120           return;
 121
 122         /* Read bytes from the USB OUT endpoint into the UART transmit buffer */
 123         int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
 124         if (!(ReceivedByte < 0) && !(RingBuffer_IsFull(&USBtoUART_Buffer)))
 125           RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte);
 126
 127         /* Check if the UART receive buffer flush timer has expired or buffer is nearly full */
 128         RingBuff_Count_t BufferCount = RingBuffer_GetCount(&UARTtoUSB_Buffer);
 129         if ((TIFR0 & (1 << TOV0)) || (BufferCount > 200))
 130         {
 131                 TIFR0 |= (1 << TOV0);
 132
 133                 /* Read bytes from the UART receive buffer into the USB IN endpoint */
 134                 while (BufferCount--)
 135                   CDC_Device_SendByte(&VirtualSerial_CDC_Interface, RingBuffer_Remove(&UARTtoUSB_Buffer));
 136         }
 137
 138         CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
 139 }
 140
 141 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 142 void SetupHardware(void)
 143 {
 144         /* Disable watchdog if enabled by bootloader/fuses */
 145         MCUSR &= ~(1 << WDRF);
 146         wdt_disable();
 147
 148         /* Disable clock division */
 149         clock_prescale_set(clock_div_1);
 150
 151         /* Hardware Initialization */
 152         SoftUART_Init();
 153         LEDs_Init();
 154         USB_Init();
 155
 156         /* Disable JTAG debugging */
 157         MCUCR |= (1 << JTD);
 158         MCUCR |= (1 << JTD);
 159
 160         /* Enable pull-up on the JTAG TDI pin so we can use it to select the mode */
 161         PORTF |= (1 << 7);
 162         _delay_ms(10);
 163
 164         /* Select the firmware mode based on the JTD pin's value */
 165         CurrentFirmwareMode = (PINF & (1 << 7)) ? MODE_USART_BRIDGE : MODE_PDI_PROGRAMMER;
 166
 167         /* Re-enable JTAG debugging */
 168         MCUCR &= ~(1 << JTD);
 169         MCUCR &= ~(1 << JTD);
 170 }
 171
 172 /** Event handler for the library USB Configuration Changed event. */
 173 void EVENT_USB_Device_ConfigurationChanged(void)
 174 {
 175         bool ConfigSuccess = true;
 176
 177         /* Configure the device endpoints according to the selected mode */
 178         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 179         {
 180                 ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
 181
 182                 /* Configure the UART flush timer - run at Fcpu/1024 for maximum interval before overflow */
 183                 TCCR0B = ((1 << CS02) | (1 << CS00));
 184
 185                 /* Initialize ring buffers used to hold serial data between USB and software UART interfaces */
 186                 RingBuffer_InitBuffer(&USBtoUART_Buffer);
 187                 RingBuffer_InitBuffer(&UARTtoUSB_Buffer);
 188
 189                 /* Start the software USART */
 190                 SoftUART_Init();
 191         }
 192         else
 193         {
 194                 ConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_OUT_EPNUM, EP_TYPE_BULK, ENDPOINT_DIR_OUT,
 195                                                             AVRISP_DATA_EPSIZE, ENDPOINT_BANK_SINGLE);
 196
 197                 #if defined(LIBUSB_DRIVER_COMPAT)
 198                 ConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_IN_EPNUM, EP_TYPE_BULK, ENDPOINT_DIR_IN,
 199                                                             AVRISP_DATA_EPSIZE, ENDPOINT_BANK_SINGLE);
 200                 #endif
 201
 202                 /* Configure the V2 protocol packet handler */
 203                 V2Protocol_Init();
 204         }
 205
 206         LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 207 }
 208
 209 /** Event handler for the library USB Unhandled Control Request event. */
 210 void EVENT_USB_Device_UnhandledControlRequest(void)
 211 {
 212         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 213           CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 214 }
 215
 216 /** Event handler for the library USB Connection event. */
 217 void EVENT_USB_Device_Connect(void)
 218 {
 219         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 220 }
 221
 222 /** Event handler for the library USB Disconnection event. */
 223 void EVENT_USB_Device_Disconnect(void)
 224 {
 225         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 226 }
 227
 228 /** Event handler for the CDC Class driver Line Encoding Changed event.
 229  *
 230  *  \param[in] CDCInterfaceInfo  Pointer to the CDC class interface configuration structure being referenced
 231  */
 232 void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 233 {
 234         /* Change the software UART's baud rate to match the new baud rate */
 235         SoftUART_SetBaud(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
 236 }
 237
 238 /** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors"
 239  *  documentation) by the application code so that the address and size of a requested descriptor can be given
 240  *  to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function
 241  *  is called so that the descriptor details can be passed back and the appropriate descriptor sent back to the
 242  *  USB host.
 243  *
 244  *  \param[in]  wValue  Descriptor type and index to retrieve
 245  *  \param[in]  wIndex  Sub-index to retrieve (such as a localized string language)
 246  *  \param[out] DescriptorAddress  Address of the retrieved descriptor
 247  *
 248  *  \return Length of the retrieved descriptor in bytes, or NO_DESCRIPTOR if the descriptor was not found
 249  */
 250 uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 251                                     const uint8_t wIndex,
 252                                     const void** const DescriptorAddress)
 253 {
 254         /* Return the correct descriptors based on the selected mode */
 255         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 256           return USART_GetDescriptor(wValue, wIndex, DescriptorAddress);
 257         else
 258           return AVRISP_GetDescriptor(wValue, wIndex, DescriptorAddress);
 259 }