312 lines
9.8 KiB
C
312 lines
9.8 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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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 2017 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 Benito 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 "Benito.h"
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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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/** Pulse generation counters to keep track of the number of milliseconds remaining for each pulse type */
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volatile struct
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{
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uint8_t ResetPulse; /**< Milliseconds remaining for target /RESET pulse */
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uint8_t TxLEDPulse; /**< Milliseconds remaining for data Tx LED pulse */
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uint8_t RxLEDPulse; /**< Milliseconds remaining for data Rx LED pulse */
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uint8_t PingPongLEDPulse; /**< Milliseconds remaining for enumeration Tx/Rx ping-pong LED pulse */
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} PulseMSRemaining;
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/** Milliseconds remaining until the receive buffer is flushed to the USB host */
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uint8_t FlushPeriodRemaining = RECEIVE_BUFFER_FLUSH_MS;
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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(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data));
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GlobalInterruptEnable();
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for (;;)
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{
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/* Echo bytes from the host to the target via the hardware USART */
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if ((UCSR1A & (1 << UDRE1)) && CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface))
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{
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UDR1 = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
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LEDs_TurnOnLEDs(LEDMASK_TX);
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PulseMSRemaining.TxLEDPulse = TX_RX_LED_PULSE_MS;
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}
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/* Check if the millisecond timer has elapsed */
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if (TIFR0 & (1 << OCF0A))
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{
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/* Clear flush timer expiry flag */
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TIFR0 |= (1 << TOV0);
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/* Check if the reset pulse period has elapsed, if so tristate the target reset line */
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if (PulseMSRemaining.ResetPulse && !(--PulseMSRemaining.ResetPulse))
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{
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LEDs_TurnOffLEDs(LEDMASK_BUSY);
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AVR_RESET_LINE_DDR &= ~AVR_RESET_LINE_MASK;
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}
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/* Check if the LEDs should be ping-ponging (during enumeration) */
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if (PulseMSRemaining.PingPongLEDPulse && !(--PulseMSRemaining.PingPongLEDPulse))
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{
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LEDs_ToggleLEDs(LEDMASK_TX | LEDMASK_RX);
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PulseMSRemaining.PingPongLEDPulse = PING_PONG_LED_PULSE_MS;
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}
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/* Turn off TX LED(s) once the TX pulse period has elapsed */
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if (PulseMSRemaining.TxLEDPulse && !(--PulseMSRemaining.TxLEDPulse))
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LEDs_TurnOffLEDs(LEDMASK_TX);
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/* Turn off RX LED(s) once the RX pulse period has elapsed */
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if (PulseMSRemaining.RxLEDPulse && !(--PulseMSRemaining.RxLEDPulse))
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LEDs_TurnOffLEDs(LEDMASK_RX);
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/* Check if the receive buffer flush period has expired */
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uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);
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if (!(--FlushPeriodRemaining) || (BufferCount > 200))
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{
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FlushPeriodRemaining = RECEIVE_BUFFER_FLUSH_MS;
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/* Start RX LED indicator pulse */
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if (BufferCount)
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{
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LEDs_TurnOnLEDs(LEDMASK_RX);
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PulseMSRemaining.RxLEDPulse = TX_RX_LED_PULSE_MS;
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}
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/* Echo bytes from the target to the host via the virtual serial port */
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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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}
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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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/* Millisecond Timer Interrupt */
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OCR0A = (F_CPU / 64 / 1000);
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TCCR0A = (1 << WGM01);
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TCCR0B = ((1 << CS01) | (1 << CS00));
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/* Tristate target /RESET Line */
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AVR_RESET_LINE_PORT &= ~AVR_RESET_LINE_MASK;
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AVR_RESET_LINE_DDR &= ~AVR_RESET_LINE_MASK;
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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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PulseMSRemaining.PingPongLEDPulse = PING_PONG_LED_PULSE_MS;
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LEDs_SetAllLEDs(LEDMASK_TX);
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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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PulseMSRemaining.PingPongLEDPulse = 0;
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LEDs_SetAllLEDs(LEDS_NO_LEDS);
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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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PulseMSRemaining.PingPongLEDPulse = 0;
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LEDs_SetAllLEDs(ConfigSuccess ? LEDS_NO_LEDS : LEDMASK_ERROR);
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}
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/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
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* the device from the USB host before passing along unhandled control requests to the library for processing
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* internally.
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*/
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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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/** 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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/** 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 Host-to-Device 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_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
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{
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static bool PreviousDTRState = false;
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bool CurrentDTRState = (CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR);
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/* Check if the DTR line has been asserted - if so, start the target AVR's reset pulse */
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if (!(PreviousDTRState) && CurrentDTRState)
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{
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LEDs_SetAllLEDs(LEDMASK_BUSY);
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AVR_RESET_LINE_DDR |= AVR_RESET_LINE_MASK;
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PulseMSRemaining.ResetPulse = AVR_RESET_PULSE_MS;
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}
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PreviousDTRState = CurrentDTRState;
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}
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