System Initialization

Functions
void	rt_system_tick_init (void)
void	rt_system_heap_init (void *begin_addr, void *end_addr)
void	rt_system_module_init (void)
void	rt_system_object_init (void)
void	rt_system_scheduler_init (void)
void	rt_system_scheduler_start (void)
void	rt_system_timer_init (void)
void	rt_system_timer_thread_init (void)
void	rt_application_init ()

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Detailed Description

When RT-Thread operating system starts up, the basic operating system facility initialization routines must be invoked.

The suggested initialization sequence is:

• initialize device hardware rt_hw_board_init();

User can put the low level hardware initialization in this function, such as DDR memory setting, pinmux setting, console device setting etc.

• show version rt_show_version();

• initialize system tick rt_system_tick_init();

• initialize kernel object [deprecated] rt_system_object_init();

• initialize timer system rt_system_timer_init();

• initialize system heap memory rt_system_heap_init(__bss_end, __end_of_memory);

• initialize module system rt_system_module_init();

• initialize scheduler system rt_system_scheduler_init();

• initialize application rt_application_init();

• initialize system timer thread rt_system_timer_thread_init();

• initialize idle thread rt_thread_idle_init();

• start scheduler rt_system_scheduler_start();

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Function Documentation

void rt_system_tick_init

(

void

)

This function will init system tick and set it to zero.

void rt_system_heap_init	(	void *	begin_addr,
		void *	end_addr
	)

This function will init system heap

Parameters:

begin_addr	the beginning address of system page
end_addr	the end address of system page

This function will initialize system heap memory.

Parameters:

begin_addr	the beginning address of system heap memory.
end_addr	the end address of system heap memory.

void rt_system_module_init

(

void

)

This function will initialize system module

void rt_system_object_init

(

void

)

This function will initialize system object management.

Deprecated:

since 0.3.0, this function does not need to be invoked in the system initialization.

void rt_system_scheduler_init

(

void

)

This function will initialize the system scheduler

void rt_system_scheduler_start

(

void

)

This function will startup scheduler. It will select one thread with the highest priority level, then switch to it.

void rt_system_timer_init

(

void

)

This function will initialize system timer

void rt_system_timer_thread_init

(

void

)

This function will initialize system timer thread

void rt_application_init

(

)

This function will initialize user application.

This function will be invoked when system initialization and system scheduler has not started. User can allocate memory, create thread, semaphore etc. However, user shall not suspend 'current' thread.