X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/e918d977b1d4465d525ee0f742dbdeec20f7885c..d11ed10c5314c44dc01c06954d1d73d4894cbff8:/LUFA/Drivers/USB/Class/Device/CDC.h diff --git a/LUFA/Drivers/USB/Class/Device/CDC.h b/LUFA/Drivers/USB/Class/Device/CDC.h index 605c3b7e9..d248868cd 100644 --- a/LUFA/Drivers/USB/Class/Device/CDC.h +++ b/LUFA/Drivers/USB/Class/Device/CDC.h @@ -1,21 +1,21 @@ /* LUFA Library - Copyright (C) Dean Camera, 2009. + Copyright (C) Dean Camera, 2010. dean [at] fourwalledcubicle [dot] com www.fourwalledcubicle.com */ /* - Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com) - - Permission to use, copy, modify, and distribute this software - and its documentation for any purpose and without fee is hereby - granted, 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 + Copyright 2010 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 disclaim all warranties with regard to this @@ -38,6 +38,23 @@ * \section Module Description * Device Mode USB Class driver framework interface, for the CDC USB Class driver. * + * \note There are several major drawbacks to the CDC-ACM standard USB class, however + * it is very standardized and thus usually available as a built-in driver on + * most platforms, and so is a better choice than a proprietary serial class. + * + * One major issue with CDC-ACM is that it requires two Interface descriptors, + * which will upset most hosts when part of a multi-function "Composite" USB + * device, as each interface will be loaded into a separate driver instance. To + * conbat this, you should use the "Interface Association Descriptor" addendum to + * the USB standard which is available on most OSes when creating Composite devices. + * + * Another major oversight is that there is no mechanism for the host to notify the + * device that there is a data sink on the host side ready to accept data. This + * means that the device may try to send data while the host isn't listening, causing + * lengthy blocking timeouts in the transmission routines. To combat this, it is + * recommended that the virtual serial line DTR (Data Terminal Ready) be used where + * possible to determine if a host application is ready for data. + * * @{ */ @@ -48,6 +65,7 @@ #include "../../USB.h" #include "../Common/CDC.h" + #include #include /* Enable C linkage for C++ Compilers: */ @@ -69,12 +87,15 @@ uint8_t DataINEndpointNumber; /**< Endpoint number of the CDC interface's IN data endpoint */ uint16_t DataINEndpointSize; /**< Size in bytes of the CDC interface's IN data endpoint */ + bool DataINEndpointDoubleBank; /** Indicates if the CDC interface's IN data endpoint should use double banking */ uint8_t DataOUTEndpointNumber; /**< Endpoint number of the CDC interface's OUT data endpoint */ uint16_t DataOUTEndpointSize; /**< Size in bytes of the CDC interface's OUT data endpoint */ + bool DataOUTEndpointDoubleBank; /** Indicates if the CDC interface's OUT data endpoint should use double banking */ uint8_t NotificationEndpointNumber; /**< Endpoint number of the CDC interface's IN notification endpoint, if used */ uint16_t NotificationEndpointSize; /**< Size in bytes of the CDC interface's IN notification endpoint, if used */ + bool NotificationEndpointDoubleBank; /** Indicates if the CDC interface's notification endpoint should use double banking */ } Config; /**< Config data for the USB class interface within the device. All elements in this section * must be set or the interface will fail to enumerate and operate correctly. */ @@ -111,23 +132,23 @@ * \ref EVENT_USB_Device_ConfigurationChanged() event so that the endpoints are configured when the configuration containing * the given CDC interface is selected. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state * - * \return Boolean true if the endpoints were sucessfully configured, false otherwise + * \return Boolean true if the endpoints were successfully configured, false otherwise */ bool CDC_Device_ConfigureEndpoints(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); - /** Processes incomming control requests from the host, that are directed to the given CDC class interface. This should be + /** Processes incoming control requests from the host, that are directed to the given CDC class interface. This should be * linked to the library \ref EVENT_USB_Device_UnhandledControlRequest() event. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state */ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); /** General management task for a given CDC class interface, required for the correct operation of the interface. This should * be called frequently in the main program loop, before the master USB management task \ref USB_USBTask(). * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state */ void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); @@ -136,7 +157,7 @@ * user program by declaring a handler function with the same name and parameters listed here. The new line encoding * settings are available in the LineEncoding structure inside the CDC interface structure passed as a parameter. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state */ void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); @@ -146,25 +167,36 @@ * are available in the ControlLineStates.HostToDevice value inside the CDC interface structure passed as a parameter, set as * a mask of CDC_CONTROL_LINE_OUT_* masks. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state */ void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); /** Sends a given string to the attached USB host, if connected. If a host is not connected when the function is called, the - * string is discarded. + * string is discarded. Bytes will be queued for transmission to the host until either the endpoint bank becomes full, or the + * \ref CDC_Device_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be + * packed into a single endpoint packet, increasing data throughput. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or + * the call will fail. + * + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state * \param[in] Data Pointer to the string to send to the host * \param[in] Length Size in bytes of the string to send to the host * * \return A value from the \ref Endpoint_Stream_RW_ErrorCodes_t enum */ - uint8_t CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length) ATTR_NON_NULL_PTR_ARG(1, 2); + uint8_t CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length) + ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2); /** Sends a given byte to the attached USB host, if connected. If a host is not connected when the function is called, the - * byte is discarded. + * byte is discarded. Bytes will be queued for transmission to the host until either the endpoint bank becomes full, or the + * \ref CDC_Device_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be + * packed into a single endpoint packet, increasing data throughput. + * + * \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or + * the call will fail. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state * \param[in] Data Byte of data to send to the host * * \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum @@ -173,7 +205,10 @@ /** Determines the number of bytes received by the CDC interface from the host, waiting to be read. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or + * the call will fail. + * + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state * * \return Total number of buffered bytes received from the host */ @@ -183,7 +218,10 @@ * returns 0. The \ref CDC_Device_BytesReceived() function should be queried before data is received to ensure that no data * underflow occurs. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or + * the call will fail. + * + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state * * \return Next received byte from the host, or 0 if no data received */ @@ -191,23 +229,60 @@ /** Flushes any data waiting to be sent, ensuring that the send buffer is cleared. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or + * the call will fail. + * + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state + * + * \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum */ - void CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); + uint8_t CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); /** Sends a Serial Control Line State Change notification to the host. This should be called when the virtual serial - * control lines (DCD, DSR, etc.) have changed states, or to give BREAK notfications to the host. Line states persist + * control lines (DCD, DSR, etc.) have changed states, or to give BREAK notifications to the host. Line states persist * until they are cleared via a second notification. This should be called each time the CDC class driver's * ControlLineStates.DeviceToHost value is updated to push the new states to the USB host. * - * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state. + * \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or + * the call will fail. + * + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state */ void CDC_Device_SendControlLineStateChange(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); + /** Creates a standard characer stream for the given CDC Device instance so that it can be used with all the regular + * functions in the avr-libc library that accept a FILE stream as a destination (e.g. fprintf). The created + * stream is bidirectional and can be used for both input and output functions. + * + * Reading data from this stream is non-blocking, i.e. in most instances, complete strings cannot be read in by a single + * fetch, as the endpoint will not be ready at some point in the transmission, aborting the transfer. However, this may + * be used when the read data is processed byte-per-bye (via getc()) or when the user application will implement its own + * line buffering. + * + * \note The created stream can be given as stdout if desired to direct the standard output from all functions + * to the given CDC interface. + * + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state + * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed + */ + void CDC_Device_CreateStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream); + + /** Identical to CDC_Device_CreateStream(), except that reads are blocking until the calling stream function terminates + * the transfer. While blocking, the USB and CDC service tasks are called repeatedly to maintain USB communications. + * + * \param[in,out] CDCInterfaceInfo Pointer to a structure containing a CDC Class configuration and state + * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed + */ + void CDC_Device_CreateBlockingStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream); + /* Private Interface - For use in library only: */ #if !defined(__DOXYGEN__) /* Function Prototypes: */ #if defined(INCLUDE_FROM_CDC_CLASS_DEVICE_C) + static int CDC_Device_putchar(char c, FILE* Stream); + static int CDC_Device_getchar(FILE* Stream); + static int CDC_Device_getchar_Blocking(FILE* Stream); + void CDC_Device_Event_Stub(void); void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Device_Event_Stub);