LUFA/Drivers/USB/Class/Host/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_USBClassCDCHost CDC Class Host 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/Host/CDC.c
  37  *
  38  *  \section Module Description
  39  *  Host Mode USB Class driver framework interface, for the CDC USB Class driver.
  40  *
  41  *  @{
  42  */
  43
  44 #ifndef __CDC_CLASS_HOST_H__
  45 #define __CDC_CLASS_HOST_H__
  46
  47         /* Includes: */
  48                 #include "../../USB.h"
  49                 #include "../Common/CDC.h"
  50
  51         /* Enable C linkage for C++ Compilers: */
  52                 #if defined(__cplusplus)
  53                         extern "C" {
  54                 #endif
  55
  56         /* Public Interface - May be used in end-application: */
  57                 /* Type Defines: */
  58                         /** Class state structure. An instance of this structure should be made within the user application,
  59                          *  and passed to each of the CDC class driver functions as the CDCInterfaceInfo parameter. This
  60                          *  stores each CDC interface's configuration and state information.
  61                          */
  62                         typedef struct
  63                         {
  64                                 const struct
  65                                 {
  66                                         uint8_t  DataINPipeNumber; /**< Pipe number of the CDC interface's IN data pipe */
  67                                         uint8_t  DataOUTPipeNumber; /**< Pipe number of the CDC interface's OUT data pipe */
  68                                         uint8_t  NotificationPipeNumber; /**< Pipe number of the CDC interface's IN notification endpoint, if used */
  69                                 } Config; /**< Config data for the USB class interface within the device. All elements in this section
  70                                            *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
  71                                            */
  72                                 struct
  73                                 {
  74                                         bool IsActive; /**< Indicates if the current interface instance is connected to an attached device, valid
  75                                                         *   after \ref CDC_Host_ConfigurePipes() is called and the Host state machine is in the
  76                                                         *   Configured state
  77                                                         */
  78                                         uint8_t ControlInterfaceNumber; /**< Interface index of the CDC-ACM control interface within the attached device */
  79
  80                                         uint16_t DataINPipeSize; /**< Size in bytes of the CDC interface's IN data pipe */
  81                                         uint16_t DataOUTPipeSize;  /**< Size in bytes of the CDC interface's OUT data pipe */
  82                                         uint16_t NotificationPipeSize;  /**< Size in bytes of the CDC interface's IN notification pipe, if used */
  83
  84                                         struct
  85                                         {
  86                                                 uint8_t HostToDevice; /**< Control line states from the host to device, as a set of CDC_CONTROL_LINE_OUT_*
  87                                                                                            *   masks.
  88                                                                                            */
  89                                                 uint8_t DeviceToHost; /**< Control line states from the device to host, as a set of CDC_CONTROL_LINE_IN_*
  90                                                                                            *   masks.
  91                                                                                            */
  92                                         } ControlLineStates;
  93
  94                                         struct
  95                                         {
  96                                                 uint32_t BaudRateBPS; /**< Baud rate of the virtual serial port, in bits per second */
  97                                                 uint8_t  CharFormat; /**< Character format of the virtual serial port, a value from the
  98                                                                                           *   CDCDevice_CDC_LineCodingFormats_t enum
  99                                                                                           */
 100                                                 uint8_t  ParityType; /**< Parity setting of the virtual serial port, a value from the
 101                                                                                           *   CDCDevice_LineCodingParity_t enum
 102                                                                                           */
 103                                                 uint8_t  DataBits; /**< Bits of data per character of the virtual serial port */
 104                                         } LineEncoding;
 105                                 } State; /**< State data for the USB class interface within the device. All elements in this section
 106                                                   *   <b>may</b> be set to initial values, but may also be ignored to default to sane values when
 107                                                   *   the interface is enumerated.
 108                                                   */
 109                         } USB_ClassInfo_CDC_Host_t;
 110
 111                 /* Enums: */
 112                         /** Enum for the possible error codes returned by the \ref CDC_Host_ConfigurePipes() function. */
 113                         enum CDCHost_EnumerationFailure_ErrorCodes_t
 114                         {
 115                                 CDC_ENUMERROR_NoError                    = 0, /**< Configuration Descriptor was processed successfully */
 116                                 CDC_ENUMERROR_InvalidConfigDescriptor    = 1, /**< The device returned an invalid Configuration Descriptor */
 117                                 CDC_ENUMERROR_NoCDCInterfaceFound        = 2, /**< A compatible CDC interface was not found in the device's Configuration Descriptor */
 118                                 CDC_ENUMERROR_EndpointsNotFound          = 3, /**< Compatible CDC endpoints were not found in the device's CDC interface */
 119                         };
 120
 121                 /* Function Prototypes: */
 122                         /** General management task for a given CDC host class interface, required for the correct operation of the interface. This should
 123                          *  be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
 124                          *
 125                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing an CDC Class host configuration and state
 126                          */
 127                         void CDC_Host_USBTask(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 128
 129                         /** Host interface configuration routine, to configure a given CDC host interface instance using the Configuration
 130                          *  Descriptor read from an attached USB device. This function automatically updates the given CDC Host instance's
 131                          *  state values and configures the pipes required to communicate with the interface if it is found within the device.
 132                          *  This should be called once after the stack has enumerated the attached device, while the host state machine is in
 133                          *  the Addressed state.
 134                          *
 135                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing an CDC Class host configuration and state
 136                          *  \param[in] ConfigDescriptorSize  Length of the attached device's Configuration Descriptor
 137                          *  \param[in] DeviceConfigDescriptor  Pointer to a buffer containing the attached device's Configuration Descriptor
 138                          *
 139                          *  \return A value from the \ref CDCHost_EnumerationFailure_ErrorCodes_t enum
 140                          */
 141                         uint8_t CDC_Host_ConfigurePipes(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, uint16_t ConfigDescriptorSize,
 142                                                         uint8_t* DeviceConfigDescriptor) ATTR_NON_NULL_PTR_ARG(1, 3);
 143
 144                         /** Sets the line encoding for the attached device's virtual serial port. This should be called when the LineEncoding
 145                          *  values of the interface have been changed to push the new settings to the USB device.
 146                          *
 147                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state
 148                          *
 149                          *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum
 150                          */
 151                         uint8_t CDC_Host_SetLineEncoding(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 152
 153                         /** Sends a Serial Control Line State Change notification to the device. This should be called when the virtual serial
 154                          *  control lines (DTR, RTS, etc.) have changed states. Line states persist until they are cleared via a second
 155                          *  notification. This should be called each time the CDC class driver's ControlLineStates.HostToDevice value is updated
 156                          *  to push the new states to the USB device.
 157                          *
 158                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state
 159                          *
 160                          *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum
 161                          */
 162                         uint8_t CDC_Host_SendControlLineStateChange(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 163
 164                         /** Sends a given string to the attached USB device, if connected. If a device is not connected when the function is called, the
 165                          *  string is discarded.
 166                          *
 167                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state
 168                          *  \param[in] Data  Pointer to the string to send to the device
 169                          *  \param[in] Length  Size in bytes of the string to send to the device
 170                          *
 171                          *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum
 172                          */
 173                         uint8_t CDC_Host_SendString(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, char* Data, const uint16_t Length) ATTR_NON_NULL_PTR_ARG(1, 2);
 174
 175                         /** Sends a given byte to the attached USB device, if connected. If a host is not connected when the function is called, the
 176                          *  byte is discarded.
 177                          *
 178                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state
 179                          *  \param[in] Data  Byte of data to send to the device
 180                          *
 181                          *  \return A value from the \ref Pipe_WaitUntilReady_ErrorCodes_t enum
 182                          */
 183                         uint8_t CDC_Host_SendByte(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, const uint8_t Data) ATTR_NON_NULL_PTR_ARG(1);
 184
 185                         /** Determines the number of bytes received by the CDC interface from the device, waiting to be read.
 186                          *
 187                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state
 188                          *
 189                          *  \return Total number of buffered bytes received from the device
 190                          */
 191                         uint16_t CDC_Host_BytesReceived(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 192
 193                         /** Reads a byte of data from the device. If no data is waiting to be read of if a USB device is not connected, the function
 194                          *  returns 0. The \ref CDC_Host_BytesReceived() function should be queried before data is received to ensure that no data
 195                          *  underflow occurs.
 196                          *
 197                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state
 198                          *
 199                          *  \return Next received byte from the device, or 0 if no data received
 200                          */
 201                         uint8_t CDC_Host_ReceiveByte(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 202
 203                         /** CDC class driver event for a control line state change on a CDC host interface. This event fires each time the device notifies
 204                          *  the host of a control line state change (containing the virtual serial control line states, such as DCD) and may be hooked in the
 205                          *  user program by declaring a handler function with the same name and parameters listed here. The new control line states
 206                          *  are available in the ControlLineStates.DeviceToHost value inside the CDC host interface structure passed as a parameter, set as
 207                          *  a mask of CDC_CONTROL_LINE_IN_* masks.
 208                          *
 209                          *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state
 210                          */
 211                         void EVENT_CDC_Host_ControLineStateChanged(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 212
 213         /* Private Interface - For use in library only: */
 214         #if !defined(__DOXYGEN__)
 215                 /* Macros: */
 216                         #define CDC_CONTROL_CLASS               0x02
 217                         #define CDC_CONTROL_SUBCLASS            0x02
 218                         #define CDC_CONTROL_PROTOCOL            0x01
 219                         #define CDC_DATA_CLASS                  0x0A
 220                         #define CDC_DATA_SUBCLASS               0x00
 221                         #define CDC_DATA_PROTOCOL               0x00
 222
 223                         #define CDC_FOUND_DATAPIPE_IN           (1 << 0)
 224                         #define CDC_FOUND_DATAPIPE_OUT          (1 << 1)
 225                         #define CDC_FOUND_NOTIFICATION_IN       (1 << 2)
 226
 227                 /* Function Prototypes: */
 228                         #if defined(INCLUDE_FROM_CDC_CLASS_HOST_C)
 229                                 void CDC_Host_Event_Stub(void);
 230                                 void EVENT_CDC_Host_ControLineStateChanged(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo)
 231                                                                            ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Host_Event_Stub);
 232                                 static uint8_t DComp_CDC_Host_NextCDCControlInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
 233                                 static uint8_t DComp_CDC_Host_NextCDCDataInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
 234                                 static uint8_t DComp_CDC_Host_NextCDCInterfaceEndpoint(void* const CurrentDescriptor);
 235                         #endif
 236         #endif
 237
 238         /* Disable C linkage for C++ Compilers: */
 239                 #if defined(__cplusplus)
 240                         }
 241                 #endif
 242
 243 #endif
 244
 245 /** @} */