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237 lines
7.5 KiB
237 lines
7.5 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2011.
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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 2011 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 disclaim 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 USBtoSerial 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 "USBtoSerial.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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static RingBuffer_t USBtoUSART_Buffer;
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/** Underlying data buffer for \ref USBtoUSART_Buffer, where the stored bytes are located. */
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static uint8_t USBtoUSART_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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static RingBuffer_t USARTtoUSB_Buffer;
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/** Underlying data buffer for \ref USARTtoUSB_Buffer, where the stored bytes are located. */
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static uint8_t USARTtoUSB_Buffer_Data[128];
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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 = 0,
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.DataINEndpointNumber = CDC_TX_EPNUM,
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.DataINEndpointSize = CDC_TXRX_EPSIZE,
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.DataINEndpointDoubleBank = false,
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.DataOUTEndpointNumber = CDC_RX_EPNUM,
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.DataOUTEndpointSize = CDC_TXRX_EPSIZE,
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.DataOUTEndpointDoubleBank = false,
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.NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
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.NotificationEndpointSize = CDC_NOTIFICATION_EPSIZE,
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.NotificationEndpointDoubleBank = false,
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},
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};
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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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RingBuffer_InitBuffer(&USBtoUSART_Buffer, USBtoUSART_Buffer_Data, sizeof(USBtoUSART_Buffer_Data));
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RingBuffer_InitBuffer(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data));
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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sei();
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for (;;)
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{
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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(&USBtoUSART_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 USART transmit buffer */
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if (!(ReceivedByte < 0))
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RingBuffer_Insert(&USBtoUSART_Buffer, ReceivedByte);
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}
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/* Check if the UART receive buffer flush timer has expired or the buffer is nearly full */
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uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_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(&USARTtoUSB_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(&USARTtoUSB_Buffer);
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}
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}
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/* Load the next byte from the USART transmit buffer into the USART */
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if (!(RingBuffer_IsEmpty(&USBtoUSART_Buffer)))
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Serial_SendByte(RingBuffer_Remove(&USBtoUSART_Buffer));
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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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/** 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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/* 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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/* Hardware Initialization */
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LEDs_Init();
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USB_Init();
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/* Start the flush timer so that overflows occur rapidly to push received bytes to the USB interface */
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TCCR0B = (1 << CS02);
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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 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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ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
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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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CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
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}
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/** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer
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* for later transmission to the host.
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*/
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ISR(USART1_RX_vect, ISR_BLOCK)
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{
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uint8_t ReceivedByte = UDR1;
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if (USB_DeviceState == DEVICE_STATE_Configured)
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RingBuffer_Insert(&USARTtoUSB_Buffer, ReceivedByte);
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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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uint8_t ConfigMask = 0;
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switch (CDCInterfaceInfo->State.LineEncoding.ParityType)
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{
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case CDC_PARITY_Odd:
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ConfigMask = ((1 << UPM11) | (1 << UPM10));
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break;
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case CDC_PARITY_Even:
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ConfigMask = (1 << UPM11);
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break;
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}
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if (CDCInterfaceInfo->State.LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
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ConfigMask |= (1 << USBS1);
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switch (CDCInterfaceInfo->State.LineEncoding.DataBits)
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{
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case 6:
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ConfigMask |= (1 << UCSZ10);
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break;
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case 7:
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ConfigMask |= (1 << UCSZ11);
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break;
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case 8:
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ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
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break;
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}
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/* Must turn off USART before reconfiguring it, otherwise incorrect operation may occur */
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UCSR1B = 0;
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UCSR1A = 0;
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UCSR1C = 0;
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/* Set the new baud rate before configuring the USART */
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UBRR1 = SERIAL_2X_UBBRVAL(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
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/* Reconfigure the USART in double speed mode for a wider baud rate range at the expense of accuracy */
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UCSR1C = ConfigMask;
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UCSR1A = (1 << U2X1);
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UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
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}
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