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Appendix B

SPRU352G – June 2005 – Revised February 2007

Core Run-Time APIs

This appendix enumerates all acceptable core run-time APIs that may be referenced by

an eXpressDSP-compliant algorithm.

Topic .................................................................................................. Page

B.1 TI C-Language Run-Time Support Library .................................... 82

B.2 DSP/BIOS Run-time Support Library ........................................... 82

SPRU352G – June 2005 – Revised February 2007 Core Run-Time APIs 81

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User's Guide 1
Submit Documentation Feedback 2
Contents 3
Read This First 7
Related Documentation 8
Text Conventions 8
Overview 9
1.1 Scope of the Standard 10
1.1.1 Rules and Guidelines 11
1.3 Goals of the Standard 12
1.4 Intentional Omissions 12
1.5 System Architecture 13
1.5.1 Frameworks 13
1.5.2 Algorithms 14
1.5.3 Core Run-Time Support 14
Chapter 2 15
2.1 Use of C Language 16
2.2 Threads and Reentrancy 16
2.2.1 Threads 16
2.2.3 Reentrancy 17
2.2.4 Example 18
2.3 Data Memory 19
2.3.1 Memory Spaces 20
Data Memory 21
2.4 Program Memory 23
2.5 ROM-ability 23
2.6 Use of Peripherals 24
Algorithm Component Model 25
3.1 Interfaces and Modules 26
3.1.1 External Identifiers 27
3.1.2 Naming Conventions 28
3.1.4 Module Instance Objects 28
Interfaces and Modules 29
3.1.7 Module Configuration 30
3.1.8 Example Module 30
3.1.10 Interface Inheritance 32
3.1.11 Summary 32
3.2 Algorithms 33
3.3 Packaging 34
3.3.1 Object Code 34
3.3.2 Header Files 35
3.3.3 Debug Verses Release 35
Packaging 36
Chapter 4 37
4.1 Data Memory 38
4.1.1 Heap Memory 38
4.1.2 Stack Memory 39
4.2 Program Memory 40
4.3 Interrupt Latency 41
4.4 Execution Time 41
4.4.1 MIPS Is Not Enough 41
4.4.2 Execution Time Model 42
Execution Time 43
DSP-Specific Guidelines 45
5.1 CPU Register Types 46
5.2 Use of Floating Point 47
5.3.1 Endian Byte Ordering 47
5.3.2 Data Models 47
5.3.3 Program Model 47
5.3.4 Register Conventions 48
5.3.5 Status Register 48
5.3.6 Interrupt Latency 49
5.4.1 Data Models 49
5.4.2 Program Models 49
5.4.3 Register Conventions 51
5.4.4 Status Registers 51
5.4.5 Interrupt Latency 52
5.5.1 Stack Architecture 52
5.5.2 Data Models 52
5.5.3 Program Models 53
5.5.4 Relocatability 53
5.5.5 Register Conventions 54
5.5.6 Status Bits 55
5.6 TMS320C24xx Guidelines 57
5.6.1 General 57
5.6.2 Data Models 57
5.6.3 Program Models 57
5.6.4 Register Conventions 57
5.6.5 Status Registers 58
5.6.6 Interrupt Latency 58
5.7.1 Data Models 58
5.7.2 Program Models 59
5.7.3 Register Conventions 59
5.7.4 Status Registers 59
5.7.5 Interrupt Latency 60
Use of the DMA Resource 61
6.1 Overview 62
6.2 Algorithm and Framework 62
6.4 Logical Channel 63
6.5 Data Transfer Properties 64
6.7 Abstract Interface 65
6.8 Resource Characterization 66
6.9 Runtime APIs 67
6.15.1 Non-Preemptive System 71
6.15.3 Preemptive System 72
Rules and Guidelines 75
A.1 General Rules 76
A.3 DMA Rules 77
A.4 General Guidelines 78
A.5 DMA Guidelines 79
Core Run-Time APIs 81
Bibliography 83
Glossary 85
Glossary of Terms 86

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