T-Kernel Specification (1.B0.02)

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198 CHAPTER 4. T-KERNEL/OS FUNCTIONS #define TSS_TSK 0 /* Task portion executing */ #define TSS_DDSP 1 /* Dispatch disabled */ #define TSS_DINT 2 /* Interrupts disabled */ #define TSS_INDP 4 /* Task-independent portion executing */ #define TSS_QTSK 8 /* Quasi-task portion executing */ The ID of the task currently in RUN state is returned in runtskid, while schedtskid indicates the ID of the next task scheduled to go to RUN state. Normally runtskid = schedtskid, but this is not necessarily true if, for example, a higher-priority task was wakened during dispatch disabled state. If there is no such task, 0 is returned. It must be possible to invoke this system call from an interrupt handler or time event handler. [Additional Notes] Depending on the OS implementation, the information returned by tk ref sys is not necessarily guaranteed to be accurate at all times. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
4.9. SYSTEM MANAGEMENT FUNCTIONS 199 tk set pow Set Power Mode [C Language Interface] ER ercd = tk_set_pow ( UINT powmode ) ; [Parameters] UINT powmod Low-power mode [Return Parameters] ER ercd Error code [Error Codes] E OK Normal completion E PAR Parameter error (value that cannot be used in powmode) E QOVR Low-power mode disable count overflow E OBJ TPW ENALOWPOW was requested with low-power mode disable count at 0 [Description] The following two power-saving functions are supported. • Switching to low-power mode when the system is idle When there are no tasks to be executed, the system switches to a low-power mode provided in hardware. Low-power mode is a function for reducing power use during very short intervals, such as from one timer interrupt to the next. This is accomplished, for example, by lowering the CPU clock frequency. It does not require complicated mode-switching in software but is implemented mainly using hardware functionality. • Automatic power-off When the operator performs no operations for a certain length of time, the system automatically cuts the power and goes to suspended state. If there is a start request (interrupt, etc.) from a peripheral device or if the operator turns on the power, the system resumes from the state when the power was cut. In the case of a power supply problem such as low battery, the system likewise cuts the power and goes to suspended state. In suspended state, the power is cut to peripheral devices and circuits as well as to the CPU, but the main memory contents are retained. tk set pow sets the low-power mode. powmode:= ( TPW_DOSUSPEND || TPW_DISLOWPOW || TPW_ENALOWPOW ) 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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4.2. TASK-DEPENDENT SYNCHRONIZATION
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4.3. TASK EXCEPTION HANDLING FUNCTI
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4.4. SYNCHRONIZATION AND COMMUNICAT
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5.4. INTERRUPT MANAGEMENT FUNCTIONS
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5.5. IO PORT ACCESS SUPPORT FUNCTIO
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5.7. SYSTEM CONFIGURATION INFORMATI
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5.7. SYSTEM CONFIGURATION INFORMATI
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5.8. SUBSYSTEM AND DEVICE DRIVER ST
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260 CHAPTER 6. T-KERNEL/DS FUNCTION
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284 CHAPTER 7. REFERENCE INT tevptn
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286 CHAPTER 7. REFERENCE ER ercd =
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288 CHAPTER 7. REFERENCE INT ct = t
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290 CHAPTER 7. REFERENCE E OACV ERC
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T-Kernel Specification (1.B0.02)

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