LUFA/Drivers/USB/Class/Device/CDC.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \ingroup Group_USBClassCDC
  32  *  @defgroup Group_USBClassCDCDevice CDC Class Device Mode Driver
  33  *
  34  *  \section Sec_Dependencies Module Source Dependencies
  35  *  The following files must be built with any user project that uses this module:
  36  *    - LUFA/Drivers/USB/Class/Device/CDC.c
  37  *
  38  *  \section Module Description
  39  *  Device Mode USB Class driver framework interface, for the CDC USB Class driver.
  40  *
  41  *  @{
  42  */
  43
  44 #ifndef _CDC_CLASS_DEVICE_H_
  45 #define _CDC_CLASS_DEVICE_H_
  46
  47         /* Includes: */
  48                 #include "../../USB.h"
  49                 #include "../Common/CDC.h"
  50
  51                 #include <stdio.h>
  52                 #include <string.h>
  53
  54         /* Enable C linkage for C++ Compilers: */
  55                 #if defined(__cplusplus)
  56                         extern "C" {
  57                 #endif
  58
  59         /* Public Interface - May be used in end-application: */
  60                 /* Type Defines: */
  61                         /** Class state structure. An instance of this structure should be made for each CDC interface
  62                          *  within the user application, and passed to each of the CDC class driver functions as the
  63                          *  CDCInterfaceInfo parameter. This stores each CDC interface's configuration and state information.
  64                          */
  65                         typedef struct
  66                         {
  67                                 const struct
  68                                 {
  69                                         uint8_t  ControlInterfaceNumber; /**< Interface number of the CDC control interface within the device */
  70
  71                                         uint8_t  DataINEndpointNumber; /**< Endpoint number of the CDC interface's IN data endpoint */
  72                                         uint16_t DataINEndpointSize; /**< Size in bytes of the CDC interface's IN data endpoint */
  73                                         bool     DataINEndpointDoubleBank; /** Indicates if the CDC interface's IN data endpoint should use double banking */
  74
  75                                         uint8_t  DataOUTEndpointNumber; /**< Endpoint number of the CDC interface's OUT data endpoint */
  76                                         uint16_t DataOUTEndpointSize;  /**< Size in bytes of the CDC interface's OUT data endpoint */
  77                                         bool     DataOUTEndpointDoubleBank; /** Indicates if the CDC interface's OUT data endpoint should use double banking */
  78
  79                                         uint8_t  NotificationEndpointNumber; /**< Endpoint number of the CDC interface's IN notification endpoint, if used */
  80                                         uint16_t NotificationEndpointSize;  /**< Size in bytes of the CDC interface's IN notification endpoint, if used */
  81                                         bool     NotificationEndpointDoubleBank; /** Indicates if the CDC interface's notification endpoint should use double banking */
  82                                 } Config; /**< Config data for the USB class interface within the device. All elements in this section
  83                                            *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
  84                                            */
  85                                 struct
  86                                 {
  87                                         struct
  88                                         {
  89                                                 uint8_t HostToDevice; /**< Control line states from the host to device, as a set of CDC_CONTROL_LINE_OUT_*
  90                                                                                            *   masks.
  91                                                                                            */
  92                                                 uint8_t DeviceToHost; /**< Control line states from the device to host, as a set of CDC_CONTROL_LINE_IN_*
  93                                                                                            *   masks.
  94                                                                                            */
  95                                         } ControlLineStates;
  96
  97                                         struct
  98                                         {
  99                                                 uint32_t BaudRateBPS; /**< Baud rate of the virtual serial port, in bits per second */
 100                                                 uint8_t  CharFormat; /**< Character format of the virtual serial port, a value from the
 101                                                                                           *   CDCDevice_CDC_LineCodingFormats_t enum
 102                                                                                           */
 103                                                 uint8_t  ParityType; /**< Parity setting of the virtual serial port, a value from the
 104                                                                                           *   CDCDevice_LineCodingParity_t enum
 105                                                                                           */
 106                                                 uint8_t  DataBits; /**< Bits of data per character of the virtual serial port */
 107                                         } LineEncoding;
 108                                 } State; /**< State data for the USB class interface within the device. All elements in this section
 109                                           *   are reset to their defaults when the interface is enumerated.
 110                                           */
 111                         } USB_ClassInfo_CDC_Device_t;
 112
 113                 /* Function Prototypes: */
 114                         /** Configures the endpoints of a given CDC interface, ready for use. This should be linked to the library
 115                          *  \ref EVENT_USB_Device_ConfigurationChanged() event so that the endpoints are configured when the configuration containing
 116                          *  the given CDC interface is selected.
 117                          *
 118                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 119                          *
 120                          *  \return Boolean true if the endpoints were successfully configured, false otherwise
 121                          */
 122                         bool CDC_Device_ConfigureEndpoints(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 123
 124                         /** Processes incoming control requests from the host, that are directed to the given CDC class interface. This should be
 125                          *  linked to the library \ref EVENT_USB_Device_UnhandledControlRequest() event.
 126                          *
 127                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 128                          */
 129                         void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 130
 131                         /** General management task for a given CDC class interface, required for the correct operation of the interface. This should
 132                          *  be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
 133                          *
 134                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 135                          */
 136                         void CDC_Device_USBTask(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 137
 138                         /** CDC class driver event for a line encoding change on a CDC interface. This event fires each time the host requests a
 139                          *  line encoding change (containing the serial parity, baud and other configuration information) and may be hooked in the
 140                          *  user program by declaring a handler function with the same name and parameters listed here. The new line encoding
 141                          *  settings are available in the LineEncoding structure inside the CDC interface structure passed as a parameter.
 142                          *
 143                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 144                          */
 145                         void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 146
 147                         /** CDC class driver event for a control line state change on a CDC interface. This event fires each time the host requests a
 148                          *  control line state change (containing the virtual serial control line states, such as DTR) and may be hooked in the
 149                          *  user program by declaring a handler function with the same name and parameters listed here. The new control line states
 150                          *  are available in the ControlLineStates.HostToDevice value inside the CDC interface structure passed as a parameter, set as
 151                          *  a mask of CDC_CONTROL_LINE_OUT_* masks.
 152                          *
 153                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 154                          */
 155                         void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 156
 157                         /** Sends a given string to the attached USB host, if connected. If a host is not connected when the function is called, the
 158                          *  string is discarded.
 159                          *
 160                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 161                          *  \param[in] Data  Pointer to the string to send to the host
 162                          *  \param[in] Length  Size in bytes of the string to send to the host
 163                          *
 164                          *  \return A value from the \ref Endpoint_Stream_RW_ErrorCodes_t enum
 165                          */
 166                         uint8_t CDC_Device_SendString(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, char* const Data, const uint16_t Length)
 167                                                       ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
 168
 169                         /** Sends a given byte to the attached USB host, if connected. If a host is not connected when the function is called, the
 170                          *  byte is discarded.
 171                          *
 172                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 173                          *  \param[in] Data  Byte of data to send to the host
 174                          *
 175                          *  \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum
 176                          */
 177                         uint8_t CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Data) ATTR_NON_NULL_PTR_ARG(1);
 178
 179                         /** Determines the number of bytes received by the CDC interface from the host, waiting to be read.
 180                          *
 181                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 182                          *
 183                          *  \return Total number of buffered bytes received from the host
 184                          */
 185                         uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 186
 187                         /** 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
 188                          *  returns 0. The \ref CDC_Device_BytesReceived() function should be queried before data is received to ensure that no data
 189                          *  underflow occurs.
 190                          *
 191                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 192                          *
 193                          *  \return Next received byte from the host, or 0 if no data received
 194                          */
 195                         uint8_t CDC_Device_ReceiveByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 196
 197                         /** Flushes any data waiting to be sent, ensuring that the send buffer is cleared.
 198                          *
 199                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 200                          *
 201                          *  \return A value from the \ref Endpoint_WaitUntilReady_ErrorCodes_t enum
 202                          */
 203                         uint8_t CDC_Device_Flush(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 204
 205                         /** Sends a Serial Control Line State Change notification to the host. This should be called when the virtual serial
 206                          *  control lines (DCD, DSR, etc.) have changed states, or to give BREAK notifications to the host. Line states persist
 207                          *  until they are cleared via a second notification. This should be called each time the CDC class driver's
 208                          *  ControlLineStates.DeviceToHost value is updated to push the new states to the USB host.
 209                          *
 210                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 211                          */
 212                         void CDC_Device_SendControlLineStateChange(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 213
 214                         /** Creates a standard characer stream for the given CDC Device instance so that it can be used with all the regular
 215                          *  functions in the avr-libc <stdio.h> library that accept a FILE stream as a destination (e.g. fprintf). The created
 216                          *  stream is bidirectional and can be used for both input and output functions.
 217                          *
 218                          *  Reading data from this stream is non-blocking, i.e. in most instances, complete strings cannot be read in by a single
 219                          *  fetch, as the endpoint will not be ready at some point in the transmission, aborting the transfer. However, this may
 220                          *  be used when the read data is processed byte-per-bye (via getc()) or when the user application will implement its own
 221                          *  line buffering.
 222                          *
 223                          *  \note The created stream can be given as stdout if desired to direct the standard output from all <stdio.h> functions
 224                          *        to the given CDC interface.
 225                          *
 226                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 227                          *  \param[in,out] Stream  Pointer to a FILE structure where the created stream should be placed
 228                          */
 229                         void CDC_Device_CreateStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream);
 230
 231                         /** Identical to CDC_Device_CreateStream(), except that reads are blocking until the calling stream function terminates
 232                          *  the transfer. While blocking, the USB and CDC service tasks are called repeatedly to maintain USB communications.
 233                          *
 234                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
 235                          *  \param[in,out] Stream  Pointer to a FILE structure where the created stream should be placed
 236                          */
 237                         void CDC_Device_CreateBlockingStream(USB_ClassInfo_CDC_Device_t* CDCInterfaceInfo, FILE* Stream);
 238
 239         /* Private Interface - For use in library only: */
 240         #if !defined(__DOXYGEN__)
 241                 /* Function Prototypes: */
 242                         #if defined(INCLUDE_FROM_CDC_CLASS_DEVICE_C)
 243                                 static int CDC_Device_putchar(char c, FILE* Stream);
 244                                 static int CDC_Device_getchar(FILE* Stream);
 245                                 static int CDC_Device_getchar_Blocking(FILE* Stream);
 246
 247                                 void CDC_Device_Event_Stub(void);
 248                                 void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 249                                                                                                                   ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Device_Event_Stub);
 250                                 void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 251                                                                                                                          ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Device_Event_Stub);
 252                         #endif
 253
 254         #endif
 255
 256         /* Disable C linkage for C++ Compilers: */
 257                 #if defined(__cplusplus)
 258                         }
 259                 #endif
 260
 261 #endif
 262
 263 /** @} */