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343 lines
12 KiB
343 lines
12 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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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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#include "USBtoSerial.h"
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/* Globals: */
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/** Contains the current baud rate and other settings of the virtual serial port.
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*
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* These values are set by the host via a class-specific request, and the physical USART should be reconfigured to match the
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* new settings each time they are changed by the host.
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*/
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CDC_Line_Coding_t LineCoding = { .BaudRateBPS = 9600,
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.CharFormat = OneStopBit,
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.ParityType = Parity_None,
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.DataBits = 8 };
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/** Ring (circular) buffer to hold the RX data - data from the host to the attached device on the serial port. */
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RingBuff_t Rx_Buffer;
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/** Ring (circular) buffer to hold the TX data - data from the attached device on the serial port to the host. */
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RingBuff_t Tx_Buffer;
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/** Flag to indicate if the USART is currently transmitting data from the Rx_Buffer circular buffer. */
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volatile bool Transmitting = false;
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/** Main program entry point. This routine configures the hardware required by the application, then
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* starts the scheduler to run the application tasks.
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*/
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int main(void)
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{
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SetupHardware();
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/* Ring buffer Initialization */
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Buffer_Initialize(&Rx_Buffer);
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Buffer_Initialize(&Tx_Buffer);
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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for (;;)
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{
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CDC_Task();
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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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ReconfigureUSART();
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USB_Init();
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}
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/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
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* starts the library USB task to begin the enumeration and USB management process.
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*/
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void EVENT_USB_Connect(void)
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{
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/* Indicate USB enumerating */
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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}
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/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
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* the status LEDs and stops the USB management and CDC management tasks.
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*/
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void EVENT_USB_Disconnect(void)
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{
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/* Reset Tx and Rx buffers, device disconnected */
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Buffer_Initialize(&Rx_Buffer);
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Buffer_Initialize(&Tx_Buffer);
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/* Indicate USB not ready */
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}
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/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
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* of the USB device after enumeration - the device endpoints are configured and the CDC management task started.
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*/
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void EVENT_USB_ConfigurationChanged(void)
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{
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/* Indicate USB connected and ready */
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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/* Setup CDC Notification, Rx and Tx Endpoints */
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if (!(Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
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ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
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ENDPOINT_BANK_SINGLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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if (!(Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
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ENDPOINT_BANK_SINGLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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if (!(Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
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ENDPOINT_BANK_SINGLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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}
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/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
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* control requests that are not handled internally by the USB library (including the CDC control commands,
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* which are all issued via the control endpoint), so that they can be handled appropriately for the application.
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*/
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void EVENT_USB_UnhandledControlPacket(void)
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{
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uint8_t* LineCodingData = (uint8_t*)&LineCoding;
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/* Process CDC specific control requests */
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switch (USB_ControlRequest.bRequest)
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{
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case REQ_GetLineEncoding:
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if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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/* Acknowledge the SETUP packet, ready for data transfer */
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Endpoint_ClearSETUP();
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/* Write the line coding data to the control endpoint */
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Endpoint_Write_Control_Stream_LE(LineCodingData, sizeof(LineCoding));
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/* Finalize the stream transfer to send the last packet or clear the host abort */
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Endpoint_ClearOUT();
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}
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break;
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case REQ_SetLineEncoding:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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/* Acknowledge the SETUP packet, ready for data transfer */
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Endpoint_ClearSETUP();
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/* Read the line coding data in from the host into the global struct */
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Endpoint_Read_Control_Stream_LE(LineCodingData, sizeof(LineCoding));
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/* Finalize the stream transfer to clear the last packet from the host */
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Endpoint_ClearIN();
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/* Reconfigure the USART with the new settings */
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ReconfigureUSART();
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}
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break;
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case REQ_SetControlLineState:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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/* Acknowledge the SETUP packet, ready for data transfer */
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Endpoint_ClearSETUP();
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/* NOTE: Here you can read in the line state mask from the host, to get the current state of the output handshake
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lines. The mask is read in from the wValue parameter in USB_ControlRequest, and can be masked against the
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CONTROL_LINE_OUT_* masks to determine the RTS and DTR line states using the following code:
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*/
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/* Acknowledge status stage */
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while (!(Endpoint_IsINReady()));
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Endpoint_ClearIN();
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}
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break;
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}
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}
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/** Task to manage CDC data transmission and reception to and from the host, from and to the physical USART. */
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void CDC_Task(void)
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{
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/* Device must be connected and configured for the task to run */
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if (!(USB_IsConnected) || !(USB_ConfigurationNumber))
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return;
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#if 0
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/* NOTE: Here you can use the notification endpoint to send back line state changes to the host, for the special RS-232
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handshake signal lines (and some error states), via the CONTROL_LINE_IN_* masks and the following code:
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*/
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USB_Notification_Header_t Notification = (USB_Notification_Header_t)
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{
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.NotificationType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
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.Notification = NOTIF_SerialState,
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.wValue = 0,
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.wIndex = 0,
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.wLength = sizeof(uint16_t),
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};
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uint16_t LineStateMask;
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// Set LineStateMask here to a mask of CONTROL_LINE_IN_* masks to set the input handshake line states to send to the host
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Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);
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Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));
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Endpoint_Write_Stream_LE(&LineStateMask, sizeof(LineStateMask));
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Endpoint_ClearIN();
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#endif
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/* Select the Serial Rx Endpoint */
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Endpoint_SelectEndpoint(CDC_RX_EPNUM);
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/* Check to see if a packet has been received from the host */
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if (Endpoint_IsOUTReceived())
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{
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/* Read the bytes in from the endpoint into the buffer while space is available */
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while (Endpoint_BytesInEndpoint() && (Rx_Buffer.Elements != BUFF_STATICSIZE))
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{
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/* Store each character from the endpoint */
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Buffer_StoreElement(&Rx_Buffer, Endpoint_Read_Byte());
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}
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/* Check to see if all bytes in the current packet have been read */
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if (!(Endpoint_BytesInEndpoint()))
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{
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/* Clear the endpoint buffer */
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Endpoint_ClearOUT();
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}
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}
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/* Check if Rx buffer contains data - if so, send it */
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if (Rx_Buffer.Elements)
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Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
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/* Select the Serial Tx Endpoint */
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Endpoint_SelectEndpoint(CDC_TX_EPNUM);
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/* Check if the Tx buffer contains anything to be sent to the host */
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if (Tx_Buffer.Elements)
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{
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/* Wait until Serial Tx Endpoint Ready for Read/Write */
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while (!(Endpoint_IsReadWriteAllowed()));
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/* Write the bytes from the buffer to the endpoint while space is available */
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while (Tx_Buffer.Elements && Endpoint_IsReadWriteAllowed())
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{
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/* Write each byte retreived from the buffer to the endpoint */
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Endpoint_Write_Byte(Buffer_GetElement(&Tx_Buffer));
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}
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/* Remember if the packet to send completely fills the endpoint */
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bool IsFull = (Endpoint_BytesInEndpoint() == CDC_TXRX_EPSIZE);
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/* Send the data */
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Endpoint_ClearIN();
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/* If no more data to send and the last packet filled the endpoint, send an empty packet to release
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* the buffer on the receiver (otherwise all data will be cached until a non-full packet is received) */
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if (IsFull && !(Tx_Buffer.Elements))
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{
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/* Wait until Serial Tx Endpoint Ready for Read/Write */
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while (!(Endpoint_IsReadWriteAllowed()));
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/* Send an empty packet to terminate the transfer */
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Endpoint_ClearIN();
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}
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}
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}
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/** ISR to handle the USART receive complete interrupt, fired each time the USART has received a character. This stores the received
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* character into the Tx_Buffer circular buffer 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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/* Only store received characters if the USB interface is connected */
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if (USB_IsConnected)
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{
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/* Character received, store it into the buffer */
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Buffer_StoreElement(&Tx_Buffer, UDR1);
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}
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}
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/** Reconfigures the USART to match the current serial port settings issued by the host as closely as possible. */
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void ReconfigureUSART(void)
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{
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uint8_t ConfigMask = 0;
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/* Determine parity - non odd/even parity mode defaults to no parity */
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if (LineCoding.ParityType == Parity_Odd)
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ConfigMask = ((1 << UPM11) | (1 << UPM10));
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else if (LineCoding.ParityType == Parity_Even)
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ConfigMask = (1 << UPM11);
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/* Determine stop bits - 1.5 stop bits is set as 1 stop bit due to hardware limitations */
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if (LineCoding.CharFormat == TwoStopBits)
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ConfigMask |= (1 << USBS1);
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/* Determine data size - 5, 6, 7, or 8 bits are supported */
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if (LineCoding.DataBits == 6)
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ConfigMask |= (1 << UCSZ10);
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else if (LineCoding.DataBits == 7)
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ConfigMask |= (1 << UCSZ11);
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else if (LineCoding.DataBits == 8)
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ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
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/* Enable double speed, gives better error percentages at 8MHz */
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UCSR1A = (1 << U2X1);
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/* Enable transmit and receive modules and interrupts */
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UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
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/* Set the USART mode to the mask generated by the Line Coding options */
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UCSR1C = ConfigMask;
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/* Set the USART baud rate register to the desired baud rate value */
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UBRR1 = SERIAL_2X_UBBRVAL((uint16_t)LineCoding.BaudRateBPS);
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}
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