Initialization

Starting Nut/OS. More...

Collaboration diagram for Initialization:

Defines
#define	NUT_THREAD_MAINSTACK   1024
#define	NUT_THREAD_IDLESTACK   256
#define	NUTMEM_END   (uintptr_t)(NUTMEM_START + NUTMEM_SIZE - 1U)
	Last memory address.
#define	HEAP_START   &__heap_start
#define	HEAP_SIZE   ((uintptr_t) (NUTMEM_END - 256 - (uintptr_t) (&__heap_start)))
Functions
void	NutAppMain (void *arg)
void	NutIdle (void *arg)
	Idle thread.
void	NutInit (void)
	Nut/OS Initialization.
Variables
void *	__heap_start

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Detailed Description

Starting Nut/OS.

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Define Documentation

#define NUT_THREAD_MAINSTACK   1024

Definition at line 165 of file nutinit.c.

Referenced by NutIdle().

#define NUT_THREAD_IDLESTACK   256

Definition at line 170 of file nutinit.c.

Referenced by NutInit().

#define NUTMEM_END   (uintptr_t)(NUTMEM_START + NUTMEM_SIZE - 1U)

Last memory address.

Definition at line 191 of file nutinit.c.

#define HEAP_START   &__heap_start

Definition at line 194 of file nutinit.c.

Referenced by NutInit().

#define HEAP_SIZE   ((uintptr_t) (NUTMEM_END - 256 - (uintptr_t) (&__heap_start)))

Definition at line 195 of file nutinit.c.

Referenced by NutInit().

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Function Documentation

void NutAppMain

(

void *

arg

)

void NutIdle

(

void *

arg

)

Idle thread.

Parameters:

arg	Ignored by the idle thread.

This function runs in an endless loop as a lowest priority thread.

Definition at line 229 of file nutinit.c.

References InitIrqHandler(), main, NUT_THREAD_MAINSTACK, NUT_THREAD_STACK_ADD, NUT_THREAD_STACK_MULT, NutIdleInit(), NutLoadConfig(), NutMainInit(), NutThreadCreate(), NutThreadDestroy(), NutThreadSetPriority(), NutThreadYield(), and NutTimerInit().

Referenced by NutInit().

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void NutInit

(

void

)

Nut/OS Initialization.

Initializes the memory management and the thread system and starts an idle thread, which in turn initializes the timer management. Finally the application's main() function is called.

Initializes the memory management and the thread system and starts an idle thread, which in turn initializes the timer management. Finally the application's main() function is called.

Depending on the compiler, different methods are used to execute this function before main() is called.

For ICCAVR the default crtatmega.o startup file is replaced by crtnut.o, which calls NutInit instead of main(). This is done by adding the following compiler options in the project:

 -ucrtnut.o nutinit.o 

crtnut.o should be replaced by crtnutram.o, if the application's variable space exceeds 4kB. For boards with RTL8019AS and EEPROM emulation (like Ethernut 1.3 Rev-G) use crtenut.o or crtenutram.o.

For AVRGCC this function is located in section .init8, which is called immediately before jumping to main(). NutInit is defined as:

 void NutInit(void) __attribute__ ((naked)) __attribute__ ((section (".init8")));

Todo:

Make heap threshold configurable, currently hardcoded at 384.

Todo:

Make wait states for external memory access configuratble.

Todo:

Make early UART initialization for kernel debugging configurable.

Definition at line 274 of file nutinit.c.

References _O_CREAT, _O_TRUNC, _O_WRONLY, _NUTDEVICE::dev_init, _NUTDEVICE::dev_open, HEAP_SIZE, HEAP_START, MC_FMR, MC_FWS_2R3W, McuInit(), NUT_THREAD_IDLESTACK, NUT_THREAD_STACK_ADD, NUT_THREAD_STACK_MULT, NutBoardInit(), NutGetCpuClock(), NutHeapAdd, NutIdle(), NutThreadCreate(), outr, puts, and stdout.

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Variable Documentation

void* __heap_start