255 rindas
8.2 KiB
C
255 rindas
8.2 KiB
C
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2014.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.lufa-lib.org
|
|
*/
|
|
|
|
/*
|
|
Copyright 2014 Dean Camera (dean [at] fourwalledcubicle [dot] com)
|
|
|
|
Permission to use, copy, modify, distribute, and sell this
|
|
software and its documentation for any purpose is hereby granted
|
|
without fee, provided that the above copyright notice appear in
|
|
all copies and that both that the copyright notice and this
|
|
permission notice and warranty disclaimer appear in supporting
|
|
documentation, and that the name of the author not be used in
|
|
advertising or publicity pertaining to distribution of the
|
|
software without specific, written prior permission.
|
|
|
|
The author disclaims all warranties with regard to this
|
|
software, including all implied warranties of merchantability
|
|
and fitness. In no event shall the author be liable for any
|
|
special, indirect or consequential damages or any damages
|
|
whatsoever resulting from loss of use, data or profits, whether
|
|
in an action of contract, negligence or other tortious action,
|
|
arising out of or in connection with the use or performance of
|
|
this software.
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* Main source file for the USBtoSerial project. This file contains the main tasks of
|
|
* the project and is responsible for the initial application hardware configuration.
|
|
*/
|
|
|
|
#include "USBtoSerial.h"
|
|
|
|
/** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
|
|
static RingBuffer_t USBtoUSART_Buffer;
|
|
|
|
/** Underlying data buffer for \ref USBtoUSART_Buffer, where the stored bytes are located. */
|
|
static uint8_t USBtoUSART_Buffer_Data[128];
|
|
|
|
/** Circular buffer to hold data from the serial port before it is sent to the host. */
|
|
static RingBuffer_t USARTtoUSB_Buffer;
|
|
|
|
/** Underlying data buffer for \ref USARTtoUSB_Buffer, where the stored bytes are located. */
|
|
static uint8_t USARTtoUSB_Buffer_Data[128];
|
|
|
|
/** LUFA CDC Class driver interface configuration and state information. This structure is
|
|
* passed to all CDC Class driver functions, so that multiple instances of the same class
|
|
* within a device can be differentiated from one another.
|
|
*/
|
|
USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
|
|
{
|
|
.Config =
|
|
{
|
|
.ControlInterfaceNumber = INTERFACE_ID_CDC_CCI,
|
|
.DataINEndpoint =
|
|
{
|
|
.Address = CDC_TX_EPADDR,
|
|
.Size = CDC_TXRX_EPSIZE,
|
|
.Banks = 1,
|
|
},
|
|
.DataOUTEndpoint =
|
|
{
|
|
.Address = CDC_RX_EPADDR,
|
|
.Size = CDC_TXRX_EPSIZE,
|
|
.Banks = 1,
|
|
},
|
|
.NotificationEndpoint =
|
|
{
|
|
.Address = CDC_NOTIFICATION_EPADDR,
|
|
.Size = CDC_NOTIFICATION_EPSIZE,
|
|
.Banks = 1,
|
|
},
|
|
},
|
|
};
|
|
|
|
|
|
/** Main program entry point. This routine contains the overall program flow, including initial
|
|
* setup of all components and the main program loop.
|
|
*/
|
|
int main(void)
|
|
{
|
|
SetupHardware();
|
|
|
|
RingBuffer_InitBuffer(&USBtoUSART_Buffer, USBtoUSART_Buffer_Data, sizeof(USBtoUSART_Buffer_Data));
|
|
RingBuffer_InitBuffer(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data));
|
|
|
|
LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
|
|
GlobalInterruptEnable();
|
|
|
|
for (;;)
|
|
{
|
|
/* Only try to read in bytes from the CDC interface if the transmit buffer is not full */
|
|
if (!(RingBuffer_IsFull(&USBtoUSART_Buffer)))
|
|
{
|
|
int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
|
|
|
|
/* Store received byte into the USART transmit buffer */
|
|
if (!(ReceivedByte < 0))
|
|
RingBuffer_Insert(&USBtoUSART_Buffer, ReceivedByte);
|
|
}
|
|
|
|
uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);
|
|
if (BufferCount)
|
|
{
|
|
Endpoint_SelectEndpoint(VirtualSerial_CDC_Interface.Config.DataINEndpoint.Address);
|
|
|
|
/* Check if a packet is already enqueued to the host - if so, we shouldn't try to send more data
|
|
* until it completes as there is a chance nothing is listening and a lengthy timeout could occur */
|
|
if (Endpoint_IsINReady())
|
|
{
|
|
/* Never send more than one bank size less one byte to the host at a time, so that we don't block
|
|
* while a Zero Length Packet (ZLP) to terminate the transfer is sent if the host isn't listening */
|
|
uint8_t BytesToSend = MIN(BufferCount, (CDC_TXRX_EPSIZE - 1));
|
|
|
|
/* Read bytes from the USART receive buffer into the USB IN endpoint */
|
|
while (BytesToSend--)
|
|
{
|
|
/* Try to send the next byte of data to the host, abort if there is an error without dequeuing */
|
|
if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
|
|
RingBuffer_Peek(&USARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
|
|
{
|
|
break;
|
|
}
|
|
|
|
/* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */
|
|
RingBuffer_Remove(&USARTtoUSB_Buffer);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Load the next byte from the USART transmit buffer into the USART if transmit buffer space is available */
|
|
if (Serial_IsSendReady() && !(RingBuffer_IsEmpty(&USBtoUSART_Buffer)))
|
|
Serial_SendByte(RingBuffer_Remove(&USBtoUSART_Buffer));
|
|
|
|
CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
|
|
USB_USBTask();
|
|
}
|
|
}
|
|
|
|
/** Configures the board hardware and chip peripherals for the demo's functionality. */
|
|
void SetupHardware(void)
|
|
{
|
|
#if (ARCH == ARCH_AVR8)
|
|
/* Disable watchdog if enabled by bootloader/fuses */
|
|
MCUSR &= ~(1 << WDRF);
|
|
wdt_disable();
|
|
|
|
/* Disable clock division */
|
|
clock_prescale_set(clock_div_1);
|
|
#endif
|
|
|
|
/* Hardware Initialization */
|
|
LEDs_Init();
|
|
USB_Init();
|
|
}
|
|
|
|
/** Event handler for the library USB Connection event. */
|
|
void EVENT_USB_Device_Connect(void)
|
|
{
|
|
LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
|
|
}
|
|
|
|
/** Event handler for the library USB Disconnection event. */
|
|
void EVENT_USB_Device_Disconnect(void)
|
|
{
|
|
LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
|
|
}
|
|
|
|
/** Event handler for the library USB Configuration Changed event. */
|
|
void EVENT_USB_Device_ConfigurationChanged(void)
|
|
{
|
|
bool ConfigSuccess = true;
|
|
|
|
ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
|
|
|
|
LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
|
|
}
|
|
|
|
/** Event handler for the library USB Control Request reception event. */
|
|
void EVENT_USB_Device_ControlRequest(void)
|
|
{
|
|
CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
|
|
}
|
|
|
|
/** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer
|
|
* for later transmission to the host.
|
|
*/
|
|
ISR(USART1_RX_vect, ISR_BLOCK)
|
|
{
|
|
uint8_t ReceivedByte = UDR1;
|
|
|
|
if ((USB_DeviceState == DEVICE_STATE_Configured) && !(RingBuffer_IsFull(&USARTtoUSB_Buffer)))
|
|
RingBuffer_Insert(&USARTtoUSB_Buffer, ReceivedByte);
|
|
}
|
|
|
|
/** Event handler for the CDC Class driver Line Encoding Changed event.
|
|
*
|
|
* \param[in] CDCInterfaceInfo Pointer to the CDC class interface configuration structure being referenced
|
|
*/
|
|
void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
|
|
{
|
|
uint8_t ConfigMask = 0;
|
|
|
|
switch (CDCInterfaceInfo->State.LineEncoding.ParityType)
|
|
{
|
|
case CDC_PARITY_Odd:
|
|
ConfigMask = ((1 << UPM11) | (1 << UPM10));
|
|
break;
|
|
case CDC_PARITY_Even:
|
|
ConfigMask = (1 << UPM11);
|
|
break;
|
|
}
|
|
|
|
if (CDCInterfaceInfo->State.LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
|
|
ConfigMask |= (1 << USBS1);
|
|
|
|
switch (CDCInterfaceInfo->State.LineEncoding.DataBits)
|
|
{
|
|
case 6:
|
|
ConfigMask |= (1 << UCSZ10);
|
|
break;
|
|
case 7:
|
|
ConfigMask |= (1 << UCSZ11);
|
|
break;
|
|
case 8:
|
|
ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
|
|
break;
|
|
}
|
|
|
|
/* Keep the TX line held high (idle) while the USART is reconfigured */
|
|
PORTD |= (1 << 3);
|
|
|
|
/* Must turn off USART before reconfiguring it, otherwise incorrect operation may occur */
|
|
UCSR1B = 0;
|
|
UCSR1A = 0;
|
|
UCSR1C = 0;
|
|
|
|
/* Set the new baud rate before configuring the USART */
|
|
UBRR1 = SERIAL_2X_UBBRVAL(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
|
|
|
|
/* Reconfigure the USART in double speed mode for a wider baud rate range at the expense of accuracy */
|
|
UCSR1C = ConfigMask;
|
|
UCSR1A = (1 << U2X1);
|
|
UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
|
|
|
|
/* Release the TX line after the USART has been reconfigured */
|
|
PORTD &= ~(1 << 3);
|
|
}
|
|
|