startup.c

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * File      : startup.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Develop Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-08-31     Bernard      first implementation
 */

#include <rtthread.h>
#include <rthw.h>

#include <AT91SAM7S.h>
#include "board.h"

extern void rt_hw_interrupt_init(void);
extern void rt_hw_board_init(void);
extern void rt_serial_init(void);
extern void rt_system_timer_init(void);
extern void rt_system_scheduler_init(void);
extern void rt_thread_idle_init(void);
extern void rt_hw_cpu_icache_enable(void);

/**
 * @addtogroup sam7x256
 */

/*@{*/

extern unsigned char __bss_start;
extern unsigned char __bss_end;

/* clear .bss */
void rt_hw_clear_bss(void)
{
	rt_uint32_t *dst;

	dst = (rt_uint32_t*)&__bss_start;
	while (dst < (rt_uint32_t*)&__bss_end) *dst++ = 0;
}

static int j = 0;
void led_flash()
{
	int i;

	rt_hw_board_led_off(j);
	for (i = 0; i < 2000000; i ++);

	if (j > 4) j = 0;
	else j ++;

	rt_hw_board_led_on(j);
	for (i = 0; i < 2000000; i ++);
}

#ifdef RT_USING_FINSH
extern void finsh_system_init(void);
#endif

extern int  rt_application_init(void);
extern void rt_show_version();

/**
 * This function will startup RT-Thread RTOS.
 */
void rtthread_startup(void)
{
	/* clear .bss */
	rt_hw_clear_bss();

	/* init hardware interrupt */
	rt_hw_interrupt_init();

	/* init board */
	rt_hw_board_init();

	/* init hardware serial */
	rt_serial_init();

	rt_show_version();

	/* init tick */
	rt_system_tick_init();

	/* init kernel object */
	rt_system_object_init();

	/* init timer system */
	rt_system_timer_init();

#ifdef RT_USING_HEAP/* if the heap memory is used */
	/* init memory system */
	rt_system_heap_init(&__bss_end, 0x203000);
#endif

	/* init scheduler system */
	rt_system_scheduler_init();

#ifdef RT_USING_HOOK /* if the hook is used */
	/* set idle thread hook */
	rt_thread_idle_sethook(led_flash);
#endif

	/* init application */
	rt_application_init();

#ifdef RT_USING_FINSH /* if finsh is used */
	/* init the finsh input */
	rt_hw_finsh_init();

	/* init finsh */
	finsh_system_init();
#endif

	/* init idle thread */
	rt_thread_idle_init();

	/* start scheduler */
	rt_system_scheduler_start();

	/* never reach here */
	return ;
}

/*@}*/