CDC.h 19.8 KB
Newer Older
1
2
/*
             LUFA Library
3
     Copyright (C) Dean Camera, 2011.
4

5
  dean [at] fourwalledcubicle [dot] com
6
           www.lufa-lib.org
7
8
9
*/

/*
10
  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
11

12
  Permission to use, copy, modify, distribute, and sell this
13
  software and its documentation for any purpose is hereby granted
14
  without fee, provided that the above copyright notice appear in
15
  all copies and that both that the copyright notice and this
16
17
18
  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
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *  \brief Host mode driver for the library USB CDC Class driver.
 *
 *  Host mode driver for the library USB CDC Class driver.
 *
36
37
 *  \note This file should not be included directly. It is automatically included as needed by the USB module driver
 *        dispatch header located in LUFA/Drivers/USB.h.
38
39
40
41
42
43
44
 */

/** \ingroup Group_USBClassCDC
 *  @defgroup Group_USBClassCDCHost CDC Class Host Mode Driver
 *
 *  \section Sec_Dependencies Module Source Dependencies
 *  The following files must be built with any user project that uses this module:
45
 *    - LUFA/Drivers/USB/Class/Host/CDC.c <i>(Makefile source module name: LUFA_SRC_USBCLASS)</i>
46
 *
47
 *  \section Sec_ModDescription Module Description
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 *  Host Mode USB Class driver framework interface, for the CDC USB Class driver.
 *
 *  @{
 */

#ifndef __CDC_CLASS_HOST_H__
#define __CDC_CLASS_HOST_H__

	/* Includes: */
		#include "../../USB.h"
		#include "../Common/CDC.h"

		#include <stdio.h>
		#include <string.h>
62

63
64
65
66
67
68
69
	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Preprocessor Checks: */
		#if !defined(__INCLUDE_FROM_CDC_DRIVER)
70
			#error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
71
72
73
74
75
76
77
		#endif

	/* Public Interface - May be used in end-application: */
		/* Type Defines: */
			/** \brief CDC Class Host Mode Configuration and State Structure.
			 *
			 *  Class state structure. An instance of this structure should be made within the user application,
78
			 *  and passed to each of the CDC class driver functions as the \c CDCInterfaceInfo parameter. This
79
80
81
82
83
84
			 *  stores each CDC interface's configuration and state information.
			 */
			typedef struct
			{
				const struct
				{
85
86
					uint8_t  DataINPipeNumber; /**< Pipe number of the CDC interface's IN data pipe. */
					bool     DataINPipeDoubleBank; /**< Indicates if the CDC interface's IN data pipe should use double banking. */
87

88
89
					uint8_t  DataOUTPipeNumber; /**< Pipe number of the CDC interface's OUT data pipe. */
					bool     DataOUTPipeDoubleBank; /**< Indicates if the CDC interface's OUT data pipe should use double banking. */
90

91
					uint8_t  NotificationPipeNumber; /**< Pipe number of the CDC interface's IN notification endpoint, if used. */
92
					bool     NotificationPipeDoubleBank; /**< Indicates if the CDC interface's notification pipe should use double banking. */
93
94
95
96
97
98
99
				} Config; /**< Config data for the USB class interface within the device. All elements in this section
				           *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
				           */
				struct
				{
					bool IsActive; /**< Indicates if the current interface instance is connected to an attached device, valid
					                *   after \ref CDC_Host_ConfigurePipes() is called and the Host state machine is in the
100
					                *   Configured state.
101
					                */
102
					uint8_t  ControlInterfaceNumber; /**< Interface index of the CDC-ACM control interface within the attached device. */
103

104
105
106
					uint16_t DataINPipeSize; /**< Size in bytes of the CDC interface's IN data pipe. */
					uint16_t DataOUTPipeSize;  /**< Size in bytes of the CDC interface's OUT data pipe. */
					uint16_t NotificationPipeSize;  /**< Size in bytes of the CDC interface's IN notification pipe, if used. */
107

108
109
					struct
					{
110
						uint8_t HostToDevice; /**< Control line states from the host to device, as a set of \c CDC_CONTROL_LINE_OUT_*
111
112
113
											   *   masks - to notify the device of changes to these values, call the
											   *   \ref CDC_Host_SendControlLineStateChange() function.
											   */
114
						uint8_t DeviceToHost; /**< Control line states from the device to host, as a set of \c CDC_CONTROL_LINE_IN_*
115
116
117
											   *   masks. This value is updated each time \ref CDC_Host_USBTask() is called.
											   */
					} ControlLineStates; /**< Current states of the virtual serial port's control lines between the device and host. */
118

119
120
121
122
123
124
					CDC_LineEncoding_t LineEncoding; /**< Line encoding used in the virtual serial port, for the device's information.
					                                  *   This is generally only used if the virtual serial port data is to be
					                                  *   reconstructed on a physical UART. When set by the host application, the
					                                  *   \ref CDC_Host_SetLineEncoding() function must be called to push the changes
					                                  *   to the device.
					                                  */
125
126
127
128
129
				} State; /**< State data for the USB class interface within the device. All elements in this section
						  *   <b>may</b> be set to initial values, but may also be ignored to default to sane values when
						  *   the interface is enumerated.
						  */
			} USB_ClassInfo_CDC_Host_t;
130

131
132
		/* Enums: */
			/** Enum for the possible error codes returned by the \ref CDC_Host_ConfigurePipes() function. */
133
			enum CDC_Host_EnumerationFailure_ErrorCodes_t
134
			{
135
136
				CDC_ENUMERROR_NoError                    = 0, /**< Configuration Descriptor was processed successfully. */
				CDC_ENUMERROR_InvalidConfigDescriptor    = 1, /**< The device returned an invalid Configuration Descriptor. */
137
				CDC_ENUMERROR_NoCompatibleInterfaceFound = 2, /**< A compatible CDC interface was not found in the device's Configuration Descriptor. */
138
				CDC_ENUMERROR_PipeConfigurationFailed    = 3, /**< One or more pipes for the specified interface could not be configured correctly. */
139
			};
140

141
142
143
144
		/* Function Prototypes: */
			/** General management task for a given CDC host 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().
			 *
145
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing an CDC Class host configuration and state.
146
147
			 */
			void CDC_Host_USBTask(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
148

149
150
151
152
153
154
			/** Host interface configuration routine, to configure a given CDC host interface instance using the Configuration
			 *  Descriptor read from an attached USB device. This function automatically updates the given CDC Host instance's
			 *  state values and configures the pipes required to communicate with the interface if it is found within the device.
			 *  This should be called once after the stack has enumerated the attached device, while the host state machine is in
			 *  the Addressed state.
			 *
155
156
157
158
			 *  \note The pipe index numbers as given in the interface's configuration structure must not overlap with any other
			 *        interface, or pipe bank corruption will occur. Gaps in the allocated pipe numbers or non-sequential indexes
			 *        within a single interface is allowed, but no two interfaces of any type have have interleaved pipe indexes.
			 *
159
160
161
			 *  \param[in,out] CDCInterfaceInfo        Pointer to a structure containing an CDC Class host configuration and state.
			 *  \param[in]     ConfigDescriptorSize    Length of the attached device's Configuration Descriptor.
			 *  \param[in]     DeviceConfigDescriptor  Pointer to a buffer containing the attached device's Configuration Descriptor.
162
			 *
163
			 *  \return A value from the \ref CDC_Host_EnumerationFailure_ErrorCodes_t enum.
164
			 */
165
166
			uint8_t CDC_Host_ConfigurePipes(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo,
			                                uint16_t ConfigDescriptorSize,
167
			                                void* DeviceConfigDescriptor) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(3);
168

169
			/** Sets the line encoding for the attached device's virtual serial port. This should be called when the \c LineEncoding
170
171
			 *  values of the interface have been changed to push the new settings to the USB device.
			 *
172
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
173
			 *
174
			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
175
176
177
178
179
			 */
			uint8_t CDC_Host_SetLineEncoding(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);

			/** Sends a Serial Control Line State Change notification to the device. This should be called when the virtual serial
			 *  control lines (DTR, RTS, etc.) have changed states. Line states persist until they are cleared via a second
180
			 *  notification. This should be called each time the CDC class driver's \c ControlLineStates.HostToDevice value is updated
181
182
			 *  to push the new states to the USB device.
			 *
183
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
184
			 *
185
			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
186
187
			 */
			uint8_t CDC_Host_SendControlLineStateChange(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
188

189
			/** Sends a Send Break request to the device. This is generally used to separate data data or to indicate a special condition
190
191
			 *  to the receiving device.
			 *
192
193
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
			 *  \param[in]     Duration          Duration of the break, in milliseconds.
194
			 *
195
			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
196
			 */
197
198
			uint8_t CDC_Host_SendBreak(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo,
			                           const uint8_t Duration) ATTR_NON_NULL_PTR_ARG(1);
199

200
201
202
203
			/** Sends a given data buffer to the attached USB device, if connected. If a device is not connected when the function is
			 *  called, the data will be discarded. Bytes will be queued for transmission to the device until either the pipe bank
			 *  becomes full, or the \ref CDC_Host_Flush() function is called to flush the pending data to the device. This allows for
			 *  multiple bytes to be packed into a single pipe packet, increasing data throughput.
204
			 *
205
			 *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
206
			 *       call will fail.
207
			 *
208
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
			 *  \param[in]     Buffer            Pointer to a buffer containing the data to send to the device.
			 *  \param[in]     Length            Length of the data to send to the device.
			 *
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum.
			 */
			uint8_t CDC_Host_SendData(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo,
			                          const uint8_t* const Buffer,
			                          const uint16_t Length);

			/** Sends a given null-terminated string to the attached USB device, if connected. If a device is not connected when the
			 *  function is called, the string is discarded. Bytes will be queued for transmission to the device until either the pipe
			 *  bank becomes full, or the \ref CDC_Host_Flush() function is called to flush the pending data to the device. This allows
			 *  for multiple bytes to be packed into a single pipe packet, increasing data throughput.
			 *
			 *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
			 *       call will fail.
			 *
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
			 *  \param[in]     String            Pointer to the null terminated string to send to the device.
228
			 *
229
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum.
230
			 */
231
			uint8_t CDC_Host_SendString(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo,
232
			                            const char* const String) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
233

234
235
			/** Sends a given byte to the attached USB device, if connected. If a device is not connected when the function is called, the
			 *  byte is discarded. Bytes will be queued for transmission to the device until either the pipe bank becomes full, or the
236
			 *  \ref CDC_Host_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be
237
238
			 *  packed into a single pipe packet, increasing data throughput.
			 *
239
			 *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
240
			 *       call will fail.
241
			 *
242
243
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
			 *  \param[in]     Data              Byte of data to send to the device.
244
			 *
245
			 *  \return A value from the \ref Pipe_WaitUntilReady_ErrorCodes_t enum.
246
			 */
247
248
			uint8_t CDC_Host_SendByte(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo,
			                          const uint8_t Data) ATTR_NON_NULL_PTR_ARG(1);
249

250
251
252
253
			/** Determines the number of bytes received by the CDC interface from the device, waiting to be read. This indicates the number
			 *  of bytes in the IN pipe bank only, and thus the number of calls to \ref CDC_Host_ReceiveByte() which are guaranteed to succeed
			 *  immediately. If multiple bytes are to be received, they should be buffered by the user application, as the pipe bank will not be
			 *  released back to the USB controller until all bytes are read.
254
			 *
255
			 *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
256
			 *       call will fail.
257
			 *
258
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
259
			 *
260
			 *  \return Total number of buffered bytes received from the device.
261
262
263
264
			 */
			uint16_t CDC_Host_BytesReceived(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);

			/** 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
265
266
			 *  returns a negative value. The \ref CDC_Host_BytesReceived() function may be queried in advance to determine how many bytes
			 *  are currently buffered in the CDC interface's data receive pipe.
267
			 *
268
			 *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
269
			 *       call will fail.
270
			 *
271
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
272
			 *
273
			 *  \return Next received byte from the device, or a negative value if no data received.
274
			 */
275
			int16_t CDC_Host_ReceiveByte(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
276

277
278
			/** Flushes any data waiting to be sent, ensuring that the send buffer is cleared.
			 *
279
			 *  \pre This function must only be called when the Host state machine is in the \ref HOST_STATE_Configured state or the
280
			 *       call will fail.
281
			 *
282
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
283
			 *
284
			 *  \return A value from the \ref Pipe_WaitUntilReady_ErrorCodes_t enum.
285
286
287
			 */
			uint8_t CDC_Host_Flush(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);

288
			/** Creates a standard character stream for the given CDC Device instance so that it can be used with all the regular
289
			 *  functions in the avr-libc \c <stdio.h> library that accept a \c FILE stream as a destination (e.g. \c fprintf). The created
290
291
			 *  stream is bidirectional and can be used for both input and output functions.
			 *
292
293
294
295
296
			 *  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 \c getc()) or when the user application will implement its own
			 *  line buffering.
			 *
297
			 *  \note The created stream can be given as stdout if desired to direct the standard output from all \c <stdio.h> functions
298
299
			 *        to the given CDC interface.
			 *
300
301
			 *  \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.
302
			 */
303
304
			void CDC_Host_CreateStream(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo,
			                           FILE* const Stream);
305

306
			/** Identical to \ref CDC_Host_CreateStream(), except that reads are blocking until the calling stream function terminates
307
308
			 *  the transfer. While blocking, the USB and CDC service tasks are called repeatedly to maintain USB communications.
			 *
309
310
			 *  \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.
311
			 */
312
313
			void CDC_Host_CreateBlockingStream(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo,
			                                   FILE* const Stream);
314
315
316
317
318

			/** CDC class driver event for a control line state change on a CDC host interface. This event fires each time the device notifies
			 *  the host of a control line state change (containing the virtual serial control line states, such as DCD) and may be hooked in the
			 *  user program by declaring a handler function with the same name and parameters listed here. The new control line states
			 *  are available in the ControlLineStates.DeviceToHost value inside the CDC host interface structure passed as a parameter, set as
319
			 *  a mask of \c CDC_CONTROL_LINE_IN_* masks.
320
			 *
321
			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state.
322
323
324
325
326
327
			 */
			void EVENT_CDC_Host_ControLineStateChanged(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);

	/* Private Interface - For use in library only: */
	#if !defined(__DOXYGEN__)
		/* Function Prototypes: */
328
			#if defined(__INCLUDE_FROM_CDC_HOST_C)
329
330
				static int CDC_Host_putchar(char c,
				                            FILE* Stream) ATTR_NON_NULL_PTR_ARG(2);
331
332
				static int CDC_Host_getchar(FILE* Stream) ATTR_NON_NULL_PTR_ARG(1);
				static int CDC_Host_getchar_Blocking(FILE* Stream) ATTR_NON_NULL_PTR_ARG(1);
333

334
				void CDC_Host_Event_Stub(void) ATTR_CONST;
335
336
				void EVENT_CDC_Host_ControLineStateChanged(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo)
				                                           ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Host_Event_Stub);
337

338
339
				static uint8_t DCOMP_CDC_Host_NextCDCControlInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
				static uint8_t DCOMP_CDC_Host_NextCDCDataInterface(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
340
				static uint8_t DCOMP_CDC_Host_NextCDCInterfaceEndpoint(void* const CurrentDescriptor) ATTR_NON_NULL_PTR_ARG(1);
Dean Camera's avatar
Dean Camera committed
341
			#endif
342
	#endif
343

344
345
346
347
348
349
350
351
	/* Disable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			}
		#endif

#endif

/** @} */
352