255 lines
8.2 KiB
C
255 lines
8.2 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2019.
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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 2019 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 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 = 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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/** 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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GlobalInterruptEnable();
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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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/* Store received byte 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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uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);
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if (BufferCount)
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{
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Endpoint_SelectEndpoint(VirtualSerial_CDC_Interface.Config.DataINEndpoint.Address);
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/* Check if a packet is already enqueued to the host - if so, we shouldn't try to send more data
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* until it completes as there is a chance nothing is listening and a lengthy timeout could occur */
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if (Endpoint_IsINReady())
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{
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/* Never send more than one bank size less one byte to the host at a time, so that we don't block
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* while a Zero Length Packet (ZLP) to terminate the transfer is sent if the host isn't listening */
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uint8_t BytesToSend = MIN(BufferCount, (CDC_TXRX_EPSIZE - 1));
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/* Read bytes from the USART receive buffer into the USB IN endpoint */
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while (BytesToSend--)
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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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}
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/* Load the next byte from the USART transmit buffer into the USART if transmit buffer space is available */
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if (Serial_IsSendReady() && !(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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#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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/* Hardware Initialization */
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LEDs_Init();
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USB_Init();
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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) && !(RingBuffer_IsFull(&USARTtoUSB_Buffer)))
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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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/* Keep the TX line held high (idle) while the USART is reconfigured */
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PORTD |= (1 << 3);
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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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/* Release the TX line after the USART has been reconfigured */
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PORTD &= ~(1 << 3);
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}
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