Coma FW-C2800 User's Guide Page 206
- Page / 276
- Table of contents
- BOOKMARKS
Rated. / 5. Based on customer reviews
I/O Overview
6-2
6.1 I/O Overview
Input and output for DSP/BIOS applications are handled by stream, pipe, and
host channel objects. Each type of object has its own module for managing
data input and output.
Note:
An alternative to pipes and streams is to use the GIO class driver to
interface with IOM mini-drivers. The DSP/BIOS Driver Developer's Guide
(SPRU616) describes the GIO class driver and the IOM mini-driver model.
The information in this chapter related to stream and pipe objects is still
relevant if you are IOM mini-drivers with streams or pipes.
A stream is a channel through which data flows between an application
program and an I/O device. This channel can be read-only (input) or
write-only (output) as shown in Figure 6-1. Streams provide a simple and
universal interface to all I/O devices, allowing the application to be completely
ignorant of the details of an individual device’s operation.
Figure 6-1. Input/Output Stream
An important aspect of stream I/O is its asynchronous nature. Buffers of data
are input or output concurrently with computation. While an application is
processing the current buffer, a new input buffer is being filled and a previous
one is being output. This efficient management of I/O buffers allows streams
to minimize copying of data. Streams exchange pointers rather than data,
thus reducing overhead and allowing programs to meet real-time constraints
more readily.
A typical program gets a buffer of input data, processes the data, and then
outputs a buffer of processed data. This sequence repeats over and over,
usually until the program is terminated.
Digital-to-analog converters, video frame grabbers, transducers, and DMA
channels are just a few examples of common I/O devices. The stream
module (SIO) interacts with these different types of devices through drivers
(managed by the DEV module) that use the DSP/BIOS programming
interface.
Application
Program
Input Output
- TMS320 DSP/BIOS 1
- User’s Guide 1
- Read This First 3
- Read This First v 5
- Related Documentation 7
- Trademarks 8
- Contents 10
- Contents xi 11
- Contents 11
- Figures 12
- Contents xiii 13
- Contents xv 15
- Examples 16
- Contents xvii 17
- Examples 18
- About DSP/BIOS 19
- About DSP/BIOS 1-3 21
- 1.2 DSP/BIOS Components 22
- Table 1-1. DSP/BIOS Modules 23
- DSP/BIOS Components 25
- About DSP/BIOS 1-7 25
- Figure 1-3. The DSP/BIOS Menu 26
- Plug-in Toolbars→DSP/BIOS 27
- 1.3 Naming Conventions 28
- 1.3.2 Object Names 29
- 1.3.3 Operation Names 29
- 1.3.4 Data Type Names 30
- 1.3.5 Memory Segment Names 31
- 1.4 For More Information 34
- Program Generation 35
- 2.1 Development Cycle 36
- Using the Configuration Tool 38
- Program Generation 2-5 39
- 2.2.5 Hierarchy Tree View 40
- 2.2.6 Ordered Collection View 40
- Program Generation 2-7 41
- Program Generation 2-13 47
- Program Generation 2-15 49
- 2.4.2 Makefiles 50
- Program Generation 2-19 53
- 2.6 DSP/BIOS Startup Sequence 54
- DSP/BIOS Startup Sequence 55
- Program Generation 2-21 55
- 2.7 Using C++ with DSP/BIOS 58
- Program Generation 2-27 61
- Instrumentation 63
- 3.1 Real-Time Analysis 64
- Real-Time Analysis 65
- Instrumentation 3-3 65
- Instrumentation Performance 66
- Instrumentation 3-5 67
- 3.3 Instrumentation APIs 69
- Instrumentation APIs 70
- →Message Log 70
- HostTarget 71
- →RTA Control Panel. Right 72
- Instrumentation 3-11 73
- →Statistics View 73
- `LOG or STS operation` 78
- Table 3-2. TRC Constants: 79
- TRC_disable(TRC_GBLTARG); 80
- 3.4.1 The Execution Graph 81
- 3.4.2 The CPU Load 82
- Example 3-3. The Idle Loop 84
- 3.4.4 Monitoring Variables 87
- 3.4.5 Interrupt Latency 90
- Kernel/Object View Debugger 91
- 3.5.1 Kernel 92
- 3.5.2 Tasks 93
- 3.5.3 Mailboxes 94
- Instrumentation 3-33 95
- 3.5.4 Semaphores 96
- 3.5.5 Memory 97
- 3.5.6 Software Interrupts 98
- Instrumentation 3-37 99
- 3.7 Real-Time Data Exchange 100
- 3.7.1 RTDX Applications 101
- 3.7.2 RTDX Usage 101
- 3.7.3 RTDX Flow of Data 101
- Real-Time Data Exchange 102
- Instrumentation 3-41 103
- 3.7.4 RTDX Modes 104
- 3.7.6 Target Buffer Size 104
- Instrumentation 3-43 105
- Thread Scheduling 106
- 4.1.1 Types of Threads 107
- Overview of Thread Scheduling 108
- Thread Scheduling 4-3 108
- 4.1.4 Thread Priorities 112
- Figure 4-1. Thread Priorities 112
- 4.1.5 Yielding and Preemption 113
- Table 4-2. Thread Preemption 114
- 4.2 Hardware Interrupts 116
- Hardware Interrupts 117
- Thread Scheduling 4-13 118
- SETC INTM, DEGM 118
- CLRC INTM, DBGM 118
- Thread Scheduling 4-15 120
- Thread Scheduling 4-17 122
- Thread Scheduling 4-19 124
- Thread Scheduling 4-21 126
- `isr code` 127
- Thread Scheduling 4-23 128
- .end 129
- 4.2.5 Registers 130
- 4.3 Software Interrupts 131
- 4.3.1 Creating SWI Objects 132
- Software Interrupts 133
- →Ordered collection view.) 133
- Thread Scheduling 4-29 134
- Thread Scheduling 4-31 136
- Thread Scheduling 4-37 142
- C54x Platform C55x Platform 142
- C6000 Platform 142
- C28x Platform 142
- SWI_enable(key); 143
- Thread Scheduling 4-39 144
- 4.4 Tasks 145
- Thread Scheduling 4-43 148
- Thread Scheduling 4-45 150
- 4.4.4 Task Hooks 152
- Note: 154
- Thread Scheduling 4-51 156
- 4.5 The Idle Loop 158
- The Idle Loop 159
- 4.6 Semaphores 160
- 4.6.1 SEM Example 161
- Semaphores 162
- Thread Scheduling 4-57 162
- Thread Scheduling 4-59 164
- 4.7 Mailboxes 166
- 4.7.1 MBX Example 167
- Mailboxes 168
- Thread Scheduling 4-63 168
- Thread Scheduling 4-65 170
- Thread Scheduling 4-67 172
- Thread Scheduling 4-69 174
- 4.8.2 System Clock 176
- 4.8.3 Example—System Clock 177
- Thread Scheduling 4-73 178
- Thread Scheduling 4-77 182
- →Execution Graph 183
- Thread Scheduling 4-79 184
- Thread Scheduling 4-81 186
- Chapter 5 187
- 5.1 Memory Management 188
- Memory Management 189
- 5.1.5 Freeing Memory 192
- 5.1.8 MEM Example 193
- Example 5-2 196
- 5.2 System Services 197
- 5.2.2 Handling Errors 199
- 5.3 Queues 200
- 5.3.2 Other QUE Functions 201
- 5.3.3 QUE Example 202
- Chapter 6 205
- 6.1 I/O Overview 206
- I/O Overview 207
- 6.3.1 Writing Data to a Pipe 211
- Example 6-3 Using PIP_alloc 215
- Example 6-4 Using PIP_get 215
- Figure 6-4. Binding Channels 217
- 6.5 I/O Performance Issues 219
- Chapter 7 220
- Creating and Deleting Streams 225
- →model) set to 225
- Int SIO_delete(stream) 225
- SIO_Handle stream; 225
- 7.3.1 Buffer Exchange 227
- 7.4 Stackable Devices 235
- Stackable Devices 236
- SIO_get ( ) 236
- SIO_put ( ) 236
- (siotest4.c, siotest4.cdb) 241
- 7.5 Controlling Streams 242
- 7.6.1 Programming Example 243
- 7.9 Device Driver Template 247
- 7.10 Streaming DEV Structures 249
- Streaming DEV Structures 251
- 7.12 Opening Devices 253
- 7.13 Real-Time I/O 257
- Application 258
- SIO_module 258
- Dxx_module 258
- Application SIO_module 258
- 7.14 Closing Devices 260
- 7.15 Device Control 262
- 7.16 Device Ready 262
- Device Ready 263
- 7.17 Types of Devices 265
- Underlying 266
Related products and manuals for Telephones Coma FW-C2800
Telephones Coma FW-C2800 Specifications
(66 pages)
(66 pages)
© 2020, manymanuals.com. All rights reserved. | 0.229 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals