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311 lines
17 KiB
311 lines
17 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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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 2010 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 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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/** \ingroup Group_USBClassCDC
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* @defgroup Group_USBClassCDCDevice CDC Class Device Mode Driver
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*
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* \section Sec_Dependencies Module Source Dependencies
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* The following files must be built with any user project that uses this module:
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* - LUFA/Drivers/USB/Class/Device/CDC.c
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*
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* \section Module Description
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* Device Mode USB Class driver framework interface, for the CDC USB Class driver.
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*
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* \note There are several major drawbacks to the CDC-ACM standard USB class, however
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* it is very standardized and thus usually available as a built-in driver on
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* most platforms, and so is a better choice than a proprietary serial class.
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*
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* One major issue with CDC-ACM is that it requires two Interface descriptors,
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* which will upset most hosts when part of a multi-function "Composite" USB
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* device, as each interface will be loaded into a separate driver instance. To
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* conbat this, you should use the "Interface Association Descriptor" addendum to
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* the USB standard which is available on most OSes when creating Composite devices.
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*
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* Another major oversight is that there is no mechanism for the host to notify the
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* device that there is a data sink on the host side ready to accept data. This
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* means that the device may try to send data while the host isn't listening, causing
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* lengthy blocking timeouts in the transmission routines. To combat this, it is
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* recommended that the virtual serial line DTR (Data Terminal Ready) be used where
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* possible to determine if a host application is ready for data.
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*
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* @{
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*/
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#ifndef _CDC_CLASS_DEVICE_H_
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#define _CDC_CLASS_DEVICE_H_
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/* Includes: */
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#include "../../USB.h"
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#include "../Common/CDC.h"
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#include <stdio.h>
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#include <string.h>
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_CDC_DRIVER)
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#error Do not include this file directly. Include LUFA/Drivers/Class/CDC.h instead.
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#endif
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/* Public Interface - May be used in end-application: */
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/* Type Defines: */
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/** Class state structure. An instance of this structure should be made for each CDC interface
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* within the user application, and passed to each of the CDC class driver functions as the
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* CDCInterfaceInfo parameter. This stores each CDC interface's configuration and state information.
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*/
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typedef struct
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{
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const struct
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{
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uint8_t ControlInterfaceNumber; /**< Interface number of the CDC control interface within the device */
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uint8_t DataINEndpointNumber; /**< Endpoint number of the CDC interface's IN data endpoint */
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uint16_t DataINEndpointSize; /**< Size in bytes of the CDC interface's IN data endpoint */
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bool DataINEndpointDoubleBank; /** Indicates if the CDC interface's IN data endpoint should use double banking */
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uint8_t DataOUTEndpointNumber; /**< Endpoint number of the CDC interface's OUT data endpoint */
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uint16_t DataOUTEndpointSize; /**< Size in bytes of the CDC interface's OUT data endpoint */
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bool DataOUTEndpointDoubleBank; /** Indicates if the CDC interface's OUT data endpoint should use double banking */
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uint8_t NotificationEndpointNumber; /**< Endpoint number of the CDC interface's IN notification endpoint, if used */
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uint16_t NotificationEndpointSize; /**< Size in bytes of the CDC interface's IN notification endpoint, if used */
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bool NotificationEndpointDoubleBank; /** Indicates if the CDC interface's notification endpoint should use double banking */
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} Config; /**< Config data for the USB class interface within the device. All elements in this section
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* <b>must</b> be set or the interface will fail to enumerate and operate correctly.
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*/
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struct
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{
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struct
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{
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uint8_t HostToDevice; /**< Control line states from the host to device, as a set of CDC_CONTROL_LINE_OUT_*
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* masks. This value is updated each time \ref CDC_Device_USBTask() is called.
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*/
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uint8_t DeviceToHost; /**< Control line states from the device to host, as a set of CDC_CONTROL_LINE_IN_*
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* masks - to notify the host of changes to these values, call the
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* \ref CDC_Device_SendControlLineStateChange() function.
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*/
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} ControlLineStates; /**< Current states of the virtual serial port's control lines between the device and host. */
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struct
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{
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uint32_t BaudRateBPS; /**< Baud rate of the virtual serial port, in bits per second */
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uint8_t CharFormat; /**< Character format of the virtual serial port, a value from the
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* CDCDevice_CDC_LineCodingFormats_t enum
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*/
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uint8_t ParityType; /**< Parity setting of the virtual serial port, a value from the
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* CDCDevice_LineCodingParity_t enum
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*/
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uint8_t DataBits; /**< Bits of data per character of the virtual serial port */
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} LineEncoding; /** Line encoding used in the virtual serial port, for the device's information. This is generally
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* only used if the virtual serial port data is to be reconstructed on a physical UART.
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*/
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} State; /**< State data for the USB class interface within the device. All elements in this section
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* are reset to their defaults when the interface is enumerated.
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*/
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} USB_ClassInfo_CDC_Device_t;
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/* Function Prototypes: */
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/** Configures the endpoints of a given CDC interface, ready for use. This should be linked to the library
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* \ref EVENT_USB_Device_ConfigurationChanged() event so that the endpoints are configured when the configuration containing
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* the given CDC interface is selected.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*
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* \return Boolean true if the endpoints were successfully configured, false otherwise
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*/
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bool CDC_Device_ConfigureEndpoints(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Processes incoming control requests from the host, that are directed to the given CDC class interface. This should be
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* linked to the library \ref EVENT_USB_Device_UnhandledControlRequest() event.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*/
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void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** General management task for a given CDC class interface, required for the correct operation of the interface. This should
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* be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*/
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void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** CDC class driver event for a line encoding change on a CDC interface. This event fires each time the host requests a
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* line encoding change (containing the serial parity, baud and other configuration information) and may be hooked in the
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* user program by declaring a handler function with the same name and parameters listed here. The new line encoding
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* settings are available in the LineEncoding structure inside the CDC interface structure passed as a parameter.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*/
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void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** CDC class driver event for a control line state change on a CDC interface. This event fires each time the host requests a
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* control line state change (containing the virtual serial control line states, such as DTR) and may be hooked in the
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* user program by declaring a handler function with the same name and parameters listed here. The new control line states
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* are available in the ControlLineStates.HostToDevice value inside the CDC interface structure passed as a parameter, set as
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* a mask of CDC_CONTROL_LINE_OUT_* masks.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*/
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void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Sends a given string to the attached USB host, if connected. If a host is not connected when the function is called, the
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* string is discarded. Bytes will be queued for transmission to the host until either the endpoint bank becomes full, or the
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* \ref CDC_Device_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be
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* packed into a single endpoint packet, increasing data throughput.
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*
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* \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
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* the call will fail.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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* \param[in] Data Pointer to the string to send to the host
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* \param[in] Length Size in bytes of the string to send to the host
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*
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* \return A value from the \ref Endpoint_Stream_RW_ErrorCodes_t enum
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*/
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uint8_t CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length)
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ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
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/** Sends a given byte to the attached USB host, if connected. If a host is not connected when the function is called, the
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* byte is discarded. Bytes will be queued for transmission to the host until either the endpoint bank becomes full, or the
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* \ref CDC_Device_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be
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* packed into a single endpoint packet, increasing data throughput.
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*
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* \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
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* the call will fail.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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* \param[in] Data Byte of data to send to the host
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*
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* \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum
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*/
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uint8_t CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Data) ATTR_NON_NULL_PTR_ARG(1);
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/** Determines the number of bytes received by the CDC interface from the host, waiting to be read.
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*
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* \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
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* the call will fail.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*
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* \return Total number of buffered bytes received from the host
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*/
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uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Reads a byte of data from the host. If no data is waiting to be read of if a USB host is not connected, the function
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* returns 0. The \ref CDC_Device_BytesReceived() function should be queried before data is received to ensure that no data
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* underflow occurs.
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*
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* \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
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* the call will fail.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*
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* \return Next received byte from the host, or 0 if no data received
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*/
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uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Flushes any data waiting to be sent, ensuring that the send buffer is cleared.
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*
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* \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
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* the call will fail.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*
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* \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum
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*/
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uint8_t CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Sends a Serial Control Line State Change notification to the host. This should be called when the virtual serial
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* control lines (DCD, DSR, etc.) have changed states, or to give BREAK notifications to the host. Line states persist
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* until they are cleared via a second notification. This should be called each time the CDC class driver's
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* ControlLineStates.DeviceToHost value is updated to push the new states to the USB host.
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*
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* \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or
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* the call will fail.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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*/
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void CDC_Device_SendControlLineStateChange(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
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/** Creates a standard characer stream for the given CDC Device instance so that it can be used with all the regular
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* functions in the avr-libc <stdio.h> library that accept a FILE stream as a destination (e.g. fprintf). The created
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* stream is bidirectional and can be used for both input and output functions.
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*
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* Reading data from this stream is non-blocking, i.e. in most instances, complete strings cannot be read in by a single
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* fetch, as the endpoint will not be ready at some point in the transmission, aborting the transfer. However, this may
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* be used when the read data is processed byte-per-bye (via getc()) or when the user application will implement its own
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* line buffering.
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*
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* \note The created stream can be given as stdout if desired to direct the standard output from all <stdio.h> functions
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* to the given CDC interface.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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* \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed
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*/
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void CDC_Device_CreateStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream);
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/** Identical to CDC_Device_CreateStream(), except that reads are blocking until the calling stream function terminates
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* the transfer. While blocking, the USB and CDC service tasks are called repeatedly to maintain USB communications.
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*
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* \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state
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* \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed
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*/
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void CDC_Device_CreateBlockingStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream);
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/* Private Interface - For use in library only: */
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#if !defined(__DOXYGEN__)
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/* Function Prototypes: */
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#if defined(__INCLUDE_FROM_CDC_CLASS_DEVICE_C)
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static int CDC_Device_putchar(char c, FILE* Stream);
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static int CDC_Device_getchar(FILE* Stream);
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static int CDC_Device_getchar_Blocking(FILE* Stream);
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void CDC_Device_Event_Stub(void);
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void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
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ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Device_Event_Stub);
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void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
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ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Device_Event_Stub);
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#endif
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#endif
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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