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@ -36,11 +36,8 @@
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#include "XPLAINBridge.h"
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/** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
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RingBuff_t USBtoUART_Buffer;
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/** Circular buffer to hold data from the serial port before it is sent to the host. */
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RingBuff_t UARTtoUSB_Buffer;
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/* Current firmware mode, making the device behave as either a programmer or a USART bridge */
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bool CurrentFirmwareMode = MODE_PDI_PROGRAMMER;
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/** LUFA CDC Class driver interface configuration and state information. This structure is
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* passed to all CDC Class driver functions, so that multiple instances of the same class
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@ -65,6 +62,13 @@ USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
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.NotificationEndpointDoubleBank = false,
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},
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};
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/** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
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RingBuff_t USBtoUART_Buffer;
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/** Circular buffer to hold data from the serial port before it is sent to the host. */
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RingBuff_t UARTtoUSB_Buffer;
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/** Main program entry point. This routine contains the overall program flow, including initial
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* setup of all components and the main program loop.
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@ -78,32 +82,60 @@ int main(void)
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for (;;)
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{
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/* Read bytes from the USB OUT endpoint into the UART transmit buffer */
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for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
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if (USB_DeviceState == DEVICE_STATE_Configured)
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{
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if (!(BUFF_STATICSIZE - USBtoUART_Buffer.Elements))
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break;
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Buffer_StoreElement(&USBtoUART_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
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if (CurrentFirmwareMode == MODE_USART_BRIDGE)
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USARTBridge_Task();
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else
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AVRISP_Task();
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}
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/* Read bytes from the UART receive buffer into the USB IN endpoint */
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if (UARTtoUSB_Buffer.Elements)
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CDC_Device_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&UARTtoUSB_Buffer));
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/* Load bytes from the UART transmit buffer into the UART */
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if ((USBtoUART_Buffer.Elements) && SoftUART_IsReady())
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SoftUART_TxByte(Buffer_GetElement(&USBtoUART_Buffer));
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/* Load bytes from the UART into the UART receive buffer */
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if(SoftUART_IsReceived())
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Buffer_StoreElement(&UARTtoUSB_Buffer, SoftUART_RxByte());
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CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
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USB_USBTask();
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}
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}
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void AVRISP_Task(void)
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{
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Endpoint_SelectEndpoint(AVRISP_DATA_EPNUM);
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/* Check to see if a V2 Protocol command has been received */
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if (Endpoint_IsOUTReceived())
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{
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LEDs_SetAllLEDs(LEDMASK_BUSY);
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/* Pass off processing of the V2 Protocol command to the V2 Protocol handler */
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V2Protocol_ProcessCommand();
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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}
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}
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void USARTBridge_Task(void)
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{
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/* Read bytes from the USB OUT endpoint into the UART transmit buffer */
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for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
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{
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if (!(BUFF_STATICSIZE - USBtoUART_Buffer.Elements))
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break;
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Buffer_StoreElement(&USBtoUART_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
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}
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/* Read bytes from the UART receive buffer into the USB IN endpoint */
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if (UARTtoUSB_Buffer.Elements)
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CDC_Device_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&UARTtoUSB_Buffer));
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/* Load bytes from the UART transmit buffer into the UART */
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if ((USBtoUART_Buffer.Elements) && SoftUART_IsReady())
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SoftUART_TxByte(Buffer_GetElement(&USBtoUART_Buffer));
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/* Load bytes from the UART into the UART receive buffer */
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if(SoftUART_IsReceived())
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Buffer_StoreElement(&UARTtoUSB_Buffer, SoftUART_RxByte());
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CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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@ -118,21 +150,59 @@ void SetupHardware(void)
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SoftUART_Init();
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LEDs_Init();
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USB_Init();
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V2Protocol_Init();
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PORTD |= (1 << 5); // PD5 is connected to the XMEGA /RESET, enable pullup
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/* Disable JTAG debugging */
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MCUCR |= (1 << JTD);
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MCUCR |= (1 << JTD);
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/* Enable pullup on the JTAG TDI pin so we can use it to select the mode */
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PORTF |= (1 << 7);
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_delay_ms(10);
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/* Select the firmware mode based on the JTD pin's value */
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CurrentFirmwareMode = (PINF & (1 << 7)) ? MODE_USART_BRIDGE : MODE_PDI_PROGRAMMER;
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}
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/** Event handler for the library USB Configuration Changed event. */
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void EVENT_USB_Device_ConfigurationChanged(void)
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{
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LEDs_SetAllLEDs(LEDS_LED1);
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bool EndpointConfigSuccess;
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if (CurrentFirmwareMode == MODE_USART_BRIDGE)
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{
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EndpointConfigSuccess = CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
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}
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else
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{
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EndpointConfigSuccess = Endpoint_ConfigureEndpoint(AVRISP_DATA_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_OUT, AVRISP_DATA_EPSIZE,
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ENDPOINT_BANK_SINGLE);
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}
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if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
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LEDs_SetAllLEDs(LEDS_NO_LEDS);
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if (EndpointConfigSuccess)
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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else
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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/** Event handler for the library USB Unhandled Control Request event. */
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void EVENT_USB_Device_UnhandledControlRequest(void)
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{
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CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
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if (CurrentFirmwareMode == MODE_USART_BRIDGE)
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CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
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}
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/** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors"
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* documentation) by the application code so that the address and size of a requested descriptor can be given
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* to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function
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* is called so that the descriptor details can be passed back and the appropriate descriptor sent back to the
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* USB host.
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*/
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uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue, const uint8_t wIndex, void** const DescriptorAddress)
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{
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if (CurrentFirmwareMode == MODE_USART_BRIDGE)
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return USART_GetDescriptor(wValue, wIndex, DescriptorAddress);
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else
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return AVRISP_GetDescriptor(wValue, wIndex, DescriptorAddress);
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}
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Dean Camera
15 years ago