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_PDI_PROGRAMMER;
  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         RingBuffer_InitBuffer(&USBtoUART_Buffer);
  81         RingBuffer_InitBuffer(&UARTtoUSB_Buffer);
  82
  83         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  84         sei();
  85
  86         for (;;)
  87         {
  88                 if (CurrentFirmwareMode == MODE_USART_BRIDGE)
  89                   USARTBridge_Task();
  90                 else
  91                   AVRISP_Task();
  92
  93                 USB_USBTask();
  94         }
  95 }
  96
  97 void AVRISP_Task(void)
  98 {
  99         /* Must be in the configured state for the AVRISP code to process data */
 100         if (USB_DeviceState != DEVICE_STATE_Configured)
 101           return;
 102
 103         Endpoint_SelectEndpoint(AVRISP_DATA_OUT_EPNUM);
 104
 105         /* Check to see if a V2 Protocol command has been received */
 106         if (Endpoint_IsOUTReceived())
 107         {
 108                 LEDs_SetAllLEDs(LEDMASK_BUSY);
 109
 110                 /* Pass off processing of the V2 Protocol command to the V2 Protocol handler */
 111                 V2Protocol_ProcessCommand();
 112
 113                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 114         }
 115 }
 116
 117 void USARTBridge_Task(void)
 118 {
 119         /* Must be in the configured state for the USART Bridge code to process data */
 120         if (USB_DeviceState != DEVICE_STATE_Configured)
 121           return;
 122
 123         /* Read bytes from the USB OUT endpoint into the UART transmit buffer */
 124         for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
 125           RingBuffer_Insert(&USBtoUART_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
 126
 127         /* Read bytes from the UART receive buffer into the USB IN endpoint */
 128         if (UARTtoUSB_Buffer.Count)
 129           CDC_Device_SendByte(&VirtualSerial_CDC_Interface, RingBuffer_Remove(&UARTtoUSB_Buffer));
 130
 131         CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
 132 }
 133
 134 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 135 void SetupHardware(void)
 136 {
 137         /* Disable watchdog if enabled by bootloader/fuses */
 138         MCUSR &= ~(1 << WDRF);
 139         wdt_disable();
 140
 141         /* Disable clock division */
 142         clock_prescale_set(clock_div_1);
 143
 144         /* Hardware Initialization */
 145         SoftUART_Init();
 146         LEDs_Init();
 147         USB_Init();
 148         V2Protocol_Init();
 149
 150         /* Disable JTAG debugging */
 151         MCUCR |= (1 << JTD);
 152         MCUCR |= (1 << JTD);
 153
 154         /* Enable pullup on the JTAG TDI pin so we can use it to select the mode */
 155         PORTF |= (1 << 7);
 156         _delay_ms(10);
 157
 158         /* Select the firmware mode based on the JTD pin's value */
 159         CurrentFirmwareMode = (PINF & (1 << 7)) ? MODE_USART_BRIDGE : MODE_PDI_PROGRAMMER;
 160
 161         /* Re-enable JTAG debugging */
 162         MCUCR &= ~(1 << JTD);
 163         MCUCR &= ~(1 << JTD);
 164 }
 165
 166 /** Event handler for the library USB Configuration Changed event. */
 167 void EVENT_USB_Device_ConfigurationChanged(void)
 168 {
 169         bool EndpointConfigSuccess = true;
 170
 171         /* Configure the device endpoints according to the selected mode */
 172         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 173         {
 174                 EndpointConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
 175         }
 176         else
 177         {
 178                 EndpointConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_OUT_EPNUM, EP_TYPE_BULK,
 179                                                                                                     ENDPOINT_DIR_OUT, AVRISP_DATA_EPSIZE,
 180                                                                                                     ENDPOINT_BANK_SINGLE);
 181
 182                 #if defined(LIBUSB_DRIVER_COMPAT)
 183                 EndpointConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_IN_EPNUM, EP_TYPE_BULK,
 184                                                                     ENDPOINT_DIR_IN, AVRISP_DATA_EPSIZE,
 185                                                                     ENDPOINT_BANK_SINGLE);
 186                 #endif
 187         }
 188
 189         if (EndpointConfigSuccess)
 190           LEDs_SetAllLEDs(LEDMASK_USB_READY);
 191         else
 192           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 193 }
 194
 195 /** Event handler for the library USB Unhandled Control Request event. */
 196 void EVENT_USB_Device_UnhandledControlRequest(void)
 197 {
 198         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 199           CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 200 }
 201
 202 /** Event handler for the library USB Connection event. */
 203 void EVENT_USB_Device_Connect(void)
 204 {
 205         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 206 }
 207
 208 /** Event handler for the library USB Disconnection event. */
 209 void EVENT_USB_Device_Disconnect(void)
 210 {
 211         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 212 }
 213
 214 /** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors"
 215  *  documentation) by the application code so that the address and size of a requested descriptor can be given
 216  *  to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function
 217  *  is called so that the descriptor details can be passed back and the appropriate descriptor sent back to the
 218  *  USB host.
 219  */
 220 uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue, const uint8_t wIndex, void** const DescriptorAddress)
 221 {
 222         /* Return the correct descriptors based on the selected mode */
 223         if (CurrentFirmwareMode == MODE_USART_BRIDGE)
 224           return USART_GetDescriptor(wValue, wIndex, DescriptorAddress);
 225         else
 226           return AVRISP_GetDescriptor(wValue, wIndex, DescriptorAddress);
 227 }