MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuale Utente Pagina 347
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Connecting to the Device
8-27
Connecting to the Device
Before you can use the serial port object to write or read data, you must connect
it to your device via the serial port specified in the
serial function. You connect
a serial port object to the device with the
fopen function.
fopen(s)
Some properties are read-only while the serial port object is connected and
must be configured before using
fopen. Examples include the
InputBufferSize and the OutputBufferSize properties. Refer to “Property
Reference” on page 8-70 to determine when you can configure a property.
Note You can create any number of serial port objects. However, you can
connect only one serial port object to a given serial port at a time.
You can examine the
Status property to verify that the serial port object is
connected to the device.
s.Status
ans =
open
As illustrated below, the connection between the serial port object and the
device is complete, and you can write and read data.
Serial Port I/O Hardware
s=serial('COM1');
fopen(s)
01.00
COM1
InstrumentMATLAB
- External Interfaces 1
- How to Contact The MathWorks: 2
- Creating Fortran MEX-Files 5
- Calling Java from MATLAB 6
- Serial Port I/O 10
- Contents 12
- Calling C and Fortran 13
- Programs from MATLAB 13
- Introducing MEX-Files 15
- MATLAB Data 18
- Numeric Matrices 19
- MATLAB Strings 19
- Sparse Matrices 19
- Cell Arrays 20
- Structures 20
- Multidimensional Arrays 20
- Logical Arrays 21
- Empty Arrays 21
- The explore Example 21
- Building MEX-Files 23
- Selecting a Compiler 24
- Preconfigured Options Files 29
- Custom Building MEX-Files 32
- Default Options File on UNIX 34
- The User Profile Directory 35
- Compile Stage 36
- Link Stage 36
- Build Options 37
- Prelink Stage 39
- Linking DLLs to MEX-Files 40
- Versioning MEX-Files 40
- •See the 43
- Troubleshooting 44
- DLLs Not on Path on Windows 44
- General Configuration Problem 45
- UNIX only 46
- MEX-files only 46
- Potential Memory Leaks 52
- Additional Information 54
- <matlab>/bin 55
- <matlab>/extern/include 56
- <matlab>/extern/src 56
- <matlab>\bin\win32 57
- <matlab>\extern\include 58
- <matlab>\extern\src 58
- Examples From the Text 58
- MEX Reference Examples 59
- MX Examples 59
- Engine and MAT Examples 59
- Technical Support 60
- Creating C Language 61
- C MEX-Files 63
- Examples of C MEX-Files 67
- that returns the values of 70
- Passing Strings 71
- The results of this input are 80
- Handling Complex Data 81
- Handling Sparse Arrays 89
- Persistent Arrays 98
- Hybrid Arrays 100
- Specifying the Function Name 101
- Handling Complex Numbers 102
- Advanced Topics 103
- Building the MEX-File 104
- Creating C Language MEX-Files 106
- Debugging on UNIX 107
- Microsoft Compiler 108
- Watcom Compiler 109
- Creating Fortran 111
- MEX-Files 111
- 3 Creating Fortran MEX-Files 112
- Fortran MEX-Files 113
- The Pointer Concept 115
- The Gateway Routine 116
- Examples of Fortran MEX-Files 119
- Passing Matrices 127
- Dynamically Allocating Memory 135
- Memory Management 147
- Compaq Visual Fortran 149
- Calling MATLAB from C 151
- Using the MATLAB Engine 153
- Communicating with MATLAB 154
- GUI-Intensive Applications 155
- Return continues the program 160
- Open field, type 166
- OK. This starts MATLAB 166
- Setting Runtime Library Path 168
- Compiling and Linking 169
- Calling Java from 171
- 5 Calling Java from MATLAB 172
- Sources of Java Classes 175
- Defining New Java Classes 175
- Using the javaObject Function 180
- Examples 186
- Assigning to a Static Field 187
- Working with Java Arrays 199
- Array Access from Java 201
- Array Access from MATLAB 201
- Array One-dimensional Array 201
- Array Indexing 202
- The Shape of the Java Array 202
- Using the javaArray Function 204
- Using the Colon Operator 207
- Using END in a Subscript 209
- Assigning to a Linear Array 211
- Assigning the Empty Matrix 211
- Subscripted Deletion 212
- Concatenating Java Arrays 213
- Passing Data to a Java Method 216
- Passing String Arguments 219
- Passing Strings in an Array 220
- Passing Objects in an Array 222
- Other Data Conversion Topics 223
- Empty Matrices and Nulls 224
- Built-In Data Types 227
- Java Objects 227
- Example – Reading a URL 233
- 1. Construct a URL Object 233
- Running the Example 237
- 3. Open the Serial Port 239
- 4. Configure the Serial Port 240
- 10. Close the Serial Port 241
- 3. Create a Hash Table 245
- 4. Create a File Input Stream 245
- 1. Input the Entry to Add 249
- Running the phonebook Program 253
- Importing and Exporting 257
- Importing and Exporting Data 258
- Using MAT-Files 259
- Exporting Data from MATLAB 260
- Use the Save command 261
- Use MATLAB I/O functions 261
- MAT-File Interface Library 262
- Finding Associated Files 264
- Include Files 265
- Libraries 265
- Example Files 265
- Examples of MAT-Files 267
- Reading a MAT-File in C 272
- Reading a MAT-File in Fortran 280
- Using the Options File 286
- ActiveX and DDE Support 287
- 7 ActiveX and DDE Support 288
- ActiveX Interfaces 289
- MATLAB ActiveX Client Support 292
- Creating ActiveX Objects 292
- Manipulating the Interface 292
- Writing Event Handlers 294
- Converting Data 297
- MATLAB Sample Control 299
- % Workbook.Saved = 1; 301
- % Quit Excel 301
- Dynamic Data Exchange (DDE) 309
- The Service Name 310
- The Topic 310
- The Item 310
- Clipboard Formats 310
- Accessing MATLAB As a Server 311
- MATLAB System Topic 312
- MATLAB Engine Topic 313
- Requesting Data from MATLAB 314
- Sending Data to MATLAB 315
- Using MATLAB As a Client 317
- Introduction 322
- Overview of the Serial Port 324
- 8 Serial Port I/O 326
- Signal States 328
- The Data Pins 329
- The Control Pins 329
- Bytes Versus Values 331
- How Are the Bits Transmitted? 332
- Start and Stop Bits 333
- Data Bits 333
- The Parity Bit 334
- Windows Platform 335
- UNIX Platform 336
- Selected Bibliography 337
- , or readasync function 339
- Configuring Property Values 342
- Specifying Property Names 343
- Default Property Values 343
- Creating a Serial Port Object 344
- Connecting to the Device 347
- function 349
- Writing Data 351
- Writing and Reading Data 353
- Writing Text Data 354
- Writing Binary Data 356
- Reading Text Data 359
- A read operation with fscanf 361
- , then you must issue the 362
- . RS232? 364
- Example: Reading Binary Data 365
- Viewing the Bitmap Data 366
- Events and Callbacks 368
- MATLAB workspace 375
- Using Control Pins 376
- Hardware Handshaking 379
- Software Handshaking 380
- End the serial port session 383
- The Record File Contents 386
- Saving and Loading 388
- Disconnecting and Cleaning Up 389
- Property Reference 390
- Serial Port Object Properties 391
- Index 395
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