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295 lines
9.8 KiB
295 lines
9.8 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2014.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2014 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the XPLAINBridge project. This file contains the main tasks of
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* the project and is responsible for the initial application hardware configuration.
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*/
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#include "XPLAINBridge.h"
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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_USART_BRIDGE;
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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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* within a device can be differentiated from one another.
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*/
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USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
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{
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.Config =
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{
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.ControlInterfaceNumber = INTERFACE_ID_CDC_CCI,
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.DataINEndpoint =
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{
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.Address = CDC_TX_EPADDR,
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.Size = CDC_TXRX_EPSIZE,
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.Banks = 1,
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},
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.DataOUTEndpoint =
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{
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.Address = CDC_RX_EPADDR,
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.Size = CDC_TXRX_EPSIZE,
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.Banks = 1,
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},
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.NotificationEndpoint =
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{
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.Address = CDC_NOTIFICATION_EPADDR,
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.Size = CDC_NOTIFICATION_EPSIZE,
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.Banks = 1,
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},
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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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RingBuffer_t USBtoUART_Buffer;
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/** Underlying data buffer for \ref USBtoUART_Buffer, where the stored bytes are located. */
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static uint8_t USBtoUART_Buffer_Data[128];
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/** Circular buffer to hold data from the serial port before it is sent to the host. */
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RingBuffer_t UARTtoUSB_Buffer;
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/** Underlying data buffer for \ref UARTtoUSB_Buffer, where the stored bytes are located. */
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static uint8_t UARTtoUSB_Buffer_Data[128];
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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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*/
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int main(void)
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{
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SetupHardware();
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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GlobalInterruptEnable();
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for (;;)
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{
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if (CurrentFirmwareMode == MODE_USART_BRIDGE)
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UARTBridge_Task();
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else
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AVRISP_Task();
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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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/* Must be in the configured state for the AVRISP code to process data */
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if (USB_DeviceState != DEVICE_STATE_Configured)
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return;
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V2Params_UpdateParamValues();
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Endpoint_SelectEndpoint(AVRISP_DATA_OUT_EPADDR);
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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 UARTBridge_Task(void)
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{
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/* Must be in the configured state for the USART Bridge code to process data */
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if (USB_DeviceState != DEVICE_STATE_Configured)
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return;
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/* Only try to read in bytes from the CDC interface if the transmit buffer is not full */
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if (!(RingBuffer_IsFull(&USBtoUART_Buffer)))
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{
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int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
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/* Read bytes from the USB OUT endpoint into the UART transmit buffer */
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if (!(ReceivedByte < 0))
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RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte);
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}
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/* Check if the UART receive buffer flush timer has expired or buffer is nearly full */
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uint16_t BufferCount = RingBuffer_GetCount(&UARTtoUSB_Buffer);
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if ((TIFR0 & (1 << TOV0)) || (BufferCount > 200))
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{
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/* Clear flush timer expiry flag */
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TIFR0 |= (1 << TOV0);
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/* Read bytes from the USART receive buffer into the USB IN endpoint */
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while (BufferCount--)
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{
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/* Try to send the next byte of data to the host, abort if there is an error without dequeuing */
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if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
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RingBuffer_Peek(&UARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
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{
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break;
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}
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/* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */
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RingBuffer_Remove(&UARTtoUSB_Buffer);
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}
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}
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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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#if (ARCH == ARCH_AVR8)
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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#endif
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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 pull-up 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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/* Re-enable JTAG debugging */
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MCUCR &= ~(1 << JTD);
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MCUCR &= ~(1 << JTD);
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/* Hardware Initialization */
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SoftUART_Init();
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LEDs_Init();
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#if defined(RESET_TOGGLES_LIBUSB_COMPAT)
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UpdateCurrentCompatibilityMode();
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#endif
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/* USB Stack Initialization */
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USB_Init();
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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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bool ConfigSuccess = true;
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/* Configure the device endpoints according to the selected mode */
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if (CurrentFirmwareMode == MODE_USART_BRIDGE)
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{
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ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
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/* Configure the UART flush timer - run at Fcpu/1024 for maximum interval before overflow */
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TCCR0B = ((1 << CS02) | (1 << CS00));
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/* Initialize ring buffers used to hold serial data between USB and software UART interfaces */
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RingBuffer_InitBuffer(&USBtoUART_Buffer, USBtoUART_Buffer_Data, sizeof(USBtoUART_Buffer_Data));
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RingBuffer_InitBuffer(&UARTtoUSB_Buffer, UARTtoUSB_Buffer_Data, sizeof(UARTtoUSB_Buffer_Data));
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/* Start the software USART */
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SoftUART_Init();
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}
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else
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{
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ConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_OUT_EPADDR, EP_TYPE_BULK, AVRISP_DATA_EPSIZE, 1);
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if ((AVRISP_DATA_IN_EPADDR & ENDPOINT_EPNUM_MASK) != (AVRISP_DATA_OUT_EPADDR & ENDPOINT_EPNUM_MASK))
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ConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_IN_EPADDR, EP_TYPE_BULK, AVRISP_DATA_EPSIZE, 1);
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/* Configure the V2 protocol packet handler */
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V2Protocol_Init();
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}
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LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
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}
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/** Event handler for the library USB Control Request reception event. */
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void EVENT_USB_Device_ControlRequest(void)
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{
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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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/** Event handler for the library USB Connection event. */
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void EVENT_USB_Device_Connect(void)
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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}
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/** Event handler for the library USB Disconnection event. */
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void EVENT_USB_Device_Disconnect(void)
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{
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}
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/** Event handler for the CDC Class driver Line Encoding Changed event.
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*
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* \param[in] CDCInterfaceInfo Pointer to the CDC class interface configuration structure being referenced
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*/
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void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
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{
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/* Change the software UART's baud rate to match the new baud rate */
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SoftUART_SetBaud(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
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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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* \param[in] wValue Descriptor type and index to retrieve
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* \param[in] wIndex Sub-index to retrieve (such as a localized string language)
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* \param[out] DescriptorAddress Address of the retrieved descriptor
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* \param[out] DescriptorMemorySpace Memory space that the descriptor is stored in
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*
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* \return Length of the retrieved descriptor in bytes, or NO_DESCRIPTOR if the descriptor was not found
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*/
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uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
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const uint8_t wIndex,
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const void** const DescriptorAddress,
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uint8_t* const DescriptorMemorySpace)
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{
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/* Return the correct descriptors based on the selected mode */
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if (CurrentFirmwareMode == MODE_USART_BRIDGE)
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return USART_GetDescriptor(wValue, wIndex, DescriptorAddress, DescriptorMemorySpace);
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else
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return AVRISP_GetDescriptor(wValue, wIndex, DescriptorAddress, DescriptorMemorySpace);
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}
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