T-Kernel Specification (1.B0.02)

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250 CHAPTER 5. T-KERNEL/SM • BOOL CheckInt( INTVEC intvec ) Checks whether interrupt intvec has been raised. If interrupt intvec has been raised, it returns TRUE (value other than 0), else FALSE. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
5.5. IO PORT ACCESS SUPPORT FUNCTIONS 251 5.5 IO Port Access Support Functions IO port access support functions are provided as library functions or C language macros. These can be called from a task-independent portion or while dispatching and interrupts are disabled. 5.5.1 IO Port Access In a system with separate IO space and memory space, an IO port access function accesses IO space. In a system with memory-mapped IO only, an IO port access function accesses memory space. Using these functions will improve software portability and readability even in a memory-mapped IO system. —_w —_h —_b Word (32-bit) units Half-word (16-bit) units Byte (8-bit) units • void out_w( INT port, UW data ) • void out_h( INT port, UH data ) • void out_b( INT port, UB data ) port IO port address data Data to be written Writes data to an IO port. • UW in_w( INT port ) • UH in_h( INT port ) • UB in_b( INT port ) port IO port address return code Data to be read Reads data from an IO port. 5.5.2 Microwait • void WaitUsec( UINT usec ) • void WaitNsec( UINT nsec ) usec nsec Wait time (microseconds) Wait time (nanoseconds) Performs a microwait for the designated interval. These waits occur in an ordinary busy loop, and as such are easily influenced by the runtime environment, such as execution in RAM, execution in ROM, memory cache on or off, etc. These wait times are therefore not very accurate. These waits are not the same as an OS WAIT state. The system state remains as RUN state. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
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T-Kernel Specification T-Kernel 1.B
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Contents 1 T-Kernel Overview 1 1.1
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CONTENTS v tk set flg (Set Event Fl
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CONTENTS vii 5.2.2 Address Space Ch
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CONTENTS ix td cal que (Reference Q
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List of Figures 1.1 Position of T-K
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List of Tables 2.1 State Transition
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System Call Notation In the parts o
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Index of T-Kernel/OS System Calls T
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INDEX OF T-KERNEL/OS SYSTEM CALLS x
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Index of T-Kernel/SM Extended SVC L
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Index of T-Kernel/DS System Calls T
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Chapter 1 T-Kernel Overview 1.1 Pos
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1.2. SCALABILITY 3 • Middleware m
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Chapter 2 Concepts Underlying the T
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2.2. TASK STATES AND SCHEDULING RUL
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2.2. TASK STATES AND SCHEDULING RUL
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2.3. INTERRUPT HANDLING 11 preceden
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2.5. SYSTEM STATES 13 Transient sta
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2.7. MEMORY 15 which the upper and
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Chapter 3 Common T-Kernel Specifica
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3.2. SYSTEM CALLS 19 /* * Common co
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3.2. SYSTEM CALLS 21 Ordinarily a f
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3.3. HIGH-LEVEL LANGUAGE SUPPORT RO
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Chapter 4 T-Kernel/OS Functions Thi
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4.1. TASK MANAGEMENT FUNCTIONS 27 t
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4.1. TASK MANAGEMENT FUNCTIONS 29 #
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4.2. TASK-DEPENDENT SYNCHRONIZATION
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4.7. TIME MANAGEMENT FUNCTIONS 163
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4.8. INTERRUPT MANAGEMENT FUNCTIONS
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4.9. SYSTEM MANAGEMENT FUNCTIONS 19
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