Move new Class Driver powered demos to a new ClassDriver subdirectory, re-add old low level demos to a LowLevel subdirectory.
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Dean Camera
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Demos/Device/LowLevel/CDC/CDC.c
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Demos/Device/LowLevel/CDC/CDC.c
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/*
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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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/** \file
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*
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* Main source file for the CDC demo. This file contains the main tasks of the demo and
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* is responsible for the initial application hardware configuration.
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*/
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#include "CDC.h"
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/* Scheduler Task List */
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TASK_LIST
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{
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{ .Task = USB_USBTask , .TaskStatus = TASK_STOP },
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{ .Task = CDC_Task , .TaskStatus = TASK_STOP },
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};
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/* Globals: */
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/** Contains the current baud rate and other settings of the virtual serial port. While this demo does not use
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* the physical USART and thus does not use these settings, they must still be retained and returned to the host
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* upon request or the host will assume the device is non-functional.
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*
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* These values are set by the host via a class-specific request, however they are not required to be used accurately.
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* It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
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* serial link characteristics and instead sends and receives data in endpoint streams.
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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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/** String to print through the virtual serial port when the joystick is pressed upwards. */
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char JoystickUpString[] = "Joystick Up\r\n";
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/** String to print through the virtual serial port when the joystick is pressed downward. */
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char JoystickDownString[] = "Joystick Down\r\n";
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/** String to print through the virtual serial port when the joystick is pressed left. */
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char JoystickLeftString[] = "Joystick Left\r\n";
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/** String to print through the virtual serial port when the joystick is pressed right. */
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char JoystickRightString[] = "Joystick Right\r\n";
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/** String to print through the virtual serial port when the joystick is pressed inwards. */
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char JoystickPressedString[] = "Joystick Pressed\r\n";
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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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/* 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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Joystick_Init();
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LEDs_Init();
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/* Indicate USB not ready */
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UpdateStatus(Status_USBNotReady);
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/* Initialize Scheduler so that it can be used */
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Scheduler_Init();
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/* Initialize USB Subsystem */
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USB_Init();
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/* Scheduling - routine never returns, so put this last in the main function */
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Scheduler_Start();
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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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/* Start USB management task */
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Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
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/* Indicate USB enumerating */
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UpdateStatus(Status_USBEnumerating);
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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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/* Stop running CDC and USB management tasks */
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Scheduler_SetTaskMode(CDC_Task, TASK_STOP);
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Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
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/* Indicate USB not ready */
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UpdateStatus(Status_USBNotReady);
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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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/* Setup CDC Notification, Rx and Tx Endpoints */
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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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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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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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/* Indicate USB connected and ready */
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UpdateStatus(Status_USBReady);
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/* Start CDC task */
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Scheduler_SetTaskMode(CDC_Task, TASK_RUN);
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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(CDC_Line_Coding_t));
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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(CDC_Line_Coding_t));
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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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}
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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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/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
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* log to a serial port, or anything else that is suitable for status updates.
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*
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* \param CurrentStatus Current status of the system, from the CDC_StatusCodes_t enum
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*/
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void UpdateStatus(uint8_t CurrentStatus)
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{
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uint8_t LEDMask = LEDS_NO_LEDS;
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/* Set the LED mask to the appropriate LED mask based on the given status code */
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switch (CurrentStatus)
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{
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case Status_USBNotReady:
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LEDMask = (LEDS_LED1);
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break;
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case Status_USBEnumerating:
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LEDMask = (LEDS_LED1 | LEDS_LED2);
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break;
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case Status_USBReady:
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LEDMask = (LEDS_LED2 | LEDS_LED4);
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break;
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}
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/* Set the board LEDs to the new LED mask */
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LEDs_SetAllLEDs(LEDMask);
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}
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/** Function to manage CDC data transmission and reception to and from the host. */
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TASK(CDC_Task)
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{
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char* ReportString = NULL;
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uint8_t JoyStatus_LCL = Joystick_GetStatus();
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static bool ActionSent = false;
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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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/* Determine if a joystick action has occurred */
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if (JoyStatus_LCL & JOY_UP)
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ReportString = JoystickUpString;
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else if (JoyStatus_LCL & JOY_DOWN)
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ReportString = JoystickDownString;
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else if (JoyStatus_LCL & JOY_LEFT)
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ReportString = JoystickLeftString;
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else if (JoyStatus_LCL & JOY_RIGHT)
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ReportString = JoystickRightString;
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else if (JoyStatus_LCL & JOY_PRESS)
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ReportString = JoystickPressedString;
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/* Flag management - Only allow one string to be sent per action */
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if (ReportString == NULL)
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{
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ActionSent = false;
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}
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else if (ActionSent == false)
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{
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ActionSent = true;
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/* Select the Serial Tx Endpoint */
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Endpoint_SelectEndpoint(CDC_TX_EPNUM);
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/* Write the String to the Endpoint */
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Endpoint_Write_Stream_LE(ReportString, strlen(ReportString));
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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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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearIN();
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/* If the last packet filled the endpoint, send an empty packet to release the buffer on
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* the receiver (otherwise all data will be cached until a non-full packet is received) */
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if (IsFull)
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{
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/* Wait until the endpoint is ready for another packet */
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while (!(Endpoint_IsINReady()));
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/* Send an empty packet to ensure that the host does not buffer data sent to it */
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Endpoint_ClearIN();
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}
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}
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/* Select the Serial Rx Endpoint */
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Endpoint_SelectEndpoint(CDC_RX_EPNUM);
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/* Throw away any received data from the host */
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if (Endpoint_IsOUTReceived())
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Endpoint_ClearOUT();
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}
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