Projects/XPLAINBridge/XPLAINBridge.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2012.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2012  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 project 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                                 .DataINEndpoint                 =
  52                                         {
  53                                                 .Address                = CDC_TX_EPADDR,
  54                                                 .Size                   = CDC_TXRX_EPSIZE,
  55                                                 .Banks                  = 1,
  56                                         },
  57                                 .DataOUTEndpoint                =
  58                                         {
  59                                                 .Address                = CDC_RX_EPADDR,
  60                                                 .Size                   = CDC_TXRX_EPSIZE,
  61                                                 .Banks                  = 1,
  62                                         },
  63                                 .NotificationEndpoint           =
  64                                         {
  65                                                 .Address                = CDC_NOTIFICATION_EPADDR,
  66                                                 .Size                   = CDC_NOTIFICATION_EPSIZE,
  67                                                 .Banks                  = 1,
  68                                         },
  69                         },
  70         };
  71
  72 /** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
  73 RingBuffer_t   USBtoUART_Buffer;
  74
  75 /** Underlying data buffer for \ref USBtoUART_Buffer, where the stored bytes are located. */
  76 static uint8_t USBtoUART_Buffer_Data[128];
  77
  78 /** Circular buffer to hold data from the serial port before it is sent to the host. */
  79 RingBuffer_t   UARTtoUSB_Buffer;
  80
  81 /** Underlying data buffer for \ref UARTtoUSB_Buffer, where the stored bytes are located. */
  82 static uint8_t UARTtoUSB_Buffer_Data[128];
  83
  84
  85 /** Main program entry point. This routine contains the overall program flow, including initial
  86  *  setup of all components and the main program loop.
  87  */
  88 int main(void)
  89 {
  90         SetupHardware();
  91
  92         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  93         sei();
  94
  95         for (;;)
  96         {
  97                 if (CurrentFirmwareMode == MODE_USART_BRIDGE)
  98                   UARTBridge_Task();
  99                 else
 100                   AVRISP_Task();
 101
 102                 USB_USBTask();
 103         }
 104 }
 105
 106 void AVRISP_Task(void)
 107 {
 108         /* Must be in the configured state for the AVRISP code to process data */
 109         if (USB_DeviceState != DEVICE_STATE_Configured)
 110           return;
 111
 112         V2Params_UpdateParamValues();
 113
 114         Endpoint_SelectEndpoint(AVRISP_DATA_OUT_EPADDR);
 115
 116         /* Check to see if a V2 Protocol command has been received */
 117         if (Endpoint_IsOUTReceived())
 118         {
 119                 LEDs_SetAllLEDs(LEDMASK_BUSY);
 120
 121                 /* Pass off processing of the V2 Protocol command to the V2 Protocol handler */
 122                 V2Protocol_ProcessCommand();
 123
 124                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 125         }
 126 }
 127
 128 void UARTBridge_Task(void)
 129 {
 130         /* Must be in the configured state for the USART Bridge code to process data */
 131         if (USB_DeviceState != DEVICE_STATE_Configured)
 132           return;
 133
 134         /* Only try to read in bytes from the CDC interface if the transmit buffer is not full */
 135         if (!(RingBuffer_IsFull(&USBtoUART_Buffer)))
 136         {
 137                 int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
 138
 139                 /* Read bytes from the USB OUT endpoint into the UART transmit buffer */
 140                 if (!(ReceivedByte < 0))
 141                   RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte);
 142         }
 143
 144         /* Check if the UART receive buffer flush timer has expired or buffer is nearly full */
 145         uint16_t BufferCount = RingBuffer_GetCount(&UARTtoUSB_Buffer);
 146         if ((TIFR0 & (1 << TOV0)) || (BufferCount > 200))
 147         {
 148                 /* Clear flush timer expiry flag */
 149                 TIFR0 |= (1 << TOV0);
 150
 151                 /* Read bytes from the USART receive buffer into the USB IN endpoint */
 152                 while (BufferCount--)
 153                 {
 154                         /* Try to send the next byte of data to the host, abort if there is an error without dequeuing */
 155                         if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
 156                                                                         RingBuffer_Peek(&UARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
 157                         {
 158                                 break;
 159                         }
 160
 161                         /* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */
 162                         RingBuffer_Remove(&UARTtoUSB_Buffer);
 163                 }
 164         }
 165
 166         CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
 167 }
 168
 169 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 170 void SetupHardware(void)
 171 {
 172         /* Disable watchdog if enabled by bootloader/fuses */
 173         MCUSR &= ~(1 << WDRF);
 174         wdt_disable();
 175
 176         /* Disable clock division */
 177         clock_prescale_set(clock_div_1);
 178
 179         /* Hardware Initialization */
 180         SoftUART_Init();
 181         LEDs_Init();
 182         USB_Init();
 183
 184         /* Disable JTAG debugging */
 185         MCUCR |= (1 << JTD);
 186         MCUCR |= (1 << JTD);
 187
 188         /* Enable pull-up on the JTAG TDI pin so we can use it to select the mode */
 189         PORTF |= (1 << 7);
 190         Delay_MS(10);
 191
 192         /* Select the firmware mode based on the JTD pin's value */
 193         CurrentFirmwareMode = (PINF & (1 << 7)) ? MODE_USART_BRIDGE : MODE_PDI_PROGRAMMER;
 194
 195         /* Re-enable JTAG debugging */
 196         MCUCR &= ~(1 << JTD);
 197         MCUCR &= ~(1 << JTD);
 198 }
 199
 200 /** Event handler for the library USB Configuration Changed event. */
 201 void EVENT_USB_Device_ConfigurationChanged(void)
 202 {
 203         bool ConfigSuccess = true;
 204
 205         /* Configure the device endpoints according to the selected mode */
 206         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 207         {
 208                 ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
 209
 210                 /* Configure the UART flush timer - run at Fcpu/1024 for maximum interval before overflow */
 211                 TCCR0B = ((1 << CS02) | (1 << CS00));
 212
 213                 /* Initialize ring buffers used to hold serial data between USB and software UART interfaces */
 214                 RingBuffer_InitBuffer(&USBtoUART_Buffer, USBtoUART_Buffer_Data, sizeof(USBtoUART_Buffer_Data));
 215                 RingBuffer_InitBuffer(&UARTtoUSB_Buffer, UARTtoUSB_Buffer_Data, sizeof(UARTtoUSB_Buffer_Data));
 216
 217                 /* Start the software USART */
 218                 SoftUART_Init();
 219         }
 220         else
 221         {
 222                 ConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_OUT_EPADDR, EP_TYPE_BULK, AVRISP_DATA_EPSIZE, 1);
 223
 224                 #if defined(LIBUSB_DRIVER_COMPAT)
 225                 ConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_IN_EPADDR, EP_TYPE_BULK, AVRISP_DATA_EPSIZE, 1);
 226                 #endif
 227
 228                 /* Configure the V2 protocol packet handler */
 229                 V2Protocol_Init();
 230         }
 231
 232         LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 233 }
 234
 235 /** Event handler for the library USB Control Request reception event. */
 236 void EVENT_USB_Device_ControlRequest(void)
 237 {
 238         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 239           CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 240 }
 241
 242 /** Event handler for the library USB Connection event. */
 243 void EVENT_USB_Device_Connect(void)
 244 {
 245         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 246 }
 247
 248 /** Event handler for the library USB Disconnection event. */
 249 void EVENT_USB_Device_Disconnect(void)
 250 {
 251         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 252 }
 253
 254 /** Event handler for the CDC Class driver Line Encoding Changed event.
 255  *
 256  *  \param[in] CDCInterfaceInfo  Pointer to the CDC class interface configuration structure being referenced
 257  */
 258 void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 259 {
 260         /* Change the software UART's baud rate to match the new baud rate */
 261         SoftUART_SetBaud(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
 262 }
 263
 264 /** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors"
 265  *  documentation) by the application code so that the address and size of a requested descriptor can be given
 266  *  to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function
 267  *  is called so that the descriptor details can be passed back and the appropriate descriptor sent back to the
 268  *  USB host.
 269  *
 270  *  \param[in]  wValue  Descriptor type and index to retrieve
 271  *  \param[in]  wIndex  Sub-index to retrieve (such as a localized string language)
 272  *  \param[out] DescriptorAddress  Address of the retrieved descriptor
 273  *
 274  *  \return Length of the retrieved descriptor in bytes, or NO_DESCRIPTOR if the descriptor was not found
 275  */
 276 uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 277                                     const uint8_t wIndex,
 278                                     const void** const DescriptorAddress)
 279 {
 280         /* Return the correct descriptors based on the selected mode */
 281         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 282           return USART_GetDescriptor(wValue, wIndex, DescriptorAddress);
 283         else
 284           return AVRISP_GetDescriptor(wValue, wIndex, DescriptorAddress);
 285 }
 286