/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2017-07-24     Tanek        the first version
 * 2018-11-12     Ernest Chen  modify copyright
 */
//#include "bsp_led.h"
//#include "device.h"
//#include "device_drv_config.h"
#include "main.h"
#include <rthw.h>
#include <rtthread.h>
void SystemClock_Config(void);
#if 1
#define _SCB_BASE       (0xE000E010UL)
#define _SYSTICK_CTRL   (*(rt_uint32_t *)(_SCB_BASE + 0x0))
#define _SYSTICK_LOAD   (*(rt_uint32_t *)(_SCB_BASE + 0x4))
#define _SYSTICK_VAL    (*(rt_uint32_t *)(_SCB_BASE + 0x8))
#define _SYSTICK_CALIB  (*(rt_uint32_t *)(_SCB_BASE + 0xC))
#define _SYSTICK_PRI    (*(rt_uint8_t  *)(0xE000ED23UL))

// Updates the variable SystemCoreClock and must be called 
// whenever the core clock is changed during program execution.
extern void SystemCoreClockUpdate(void);

// Holds the system core clock, which is the system clock 
// frequency supplied to the SysTick timer and the processor 
// core clock.
extern uint32_t SystemCoreClock;

static uint32_t _SysTick_Config(rt_uint32_t ticks)
{
    if ((ticks - 1) > 0xFFFFFF)
    {
        return 1;
    }
    
    _SYSTICK_LOAD = ticks - 1; 
    _SYSTICK_PRI = 0xFF;
    _SYSTICK_VAL  = 0;
    _SYSTICK_CTRL = 0x07;  
    
    return 0;
}

// us级延时
void rt_hw_us_delay(rt_uint32_t us)
{
	u32 ticks;
	u32 told,tnow,tcnt=0;
	u32 reload=SysTick->LOAD;				//LOAD的值	    	 
	ticks=us; 						        //需要的节拍数 
	rt_enter_critical();					//阻止OS调度，防止打断us延时
	told=SysTick->VAL;        				//刚进入时的计数器值
	while(1)
	{
		tnow=SysTick->VAL;	
		if(tnow!=told)
		{	    
			if(tnow<told)tcnt+=told-tnow;	//这里注意一下SYSTICK是一个递减的计数器就可以了.
			else tcnt+=reload-tnow+told;	    
			told=tnow;
			if(tcnt>=ticks)break;			//时间超过/等于要延迟的时间,则退出.
		}  
	};
	rt_exit_critical();					//恢复OS调度											    
}


#endif

#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
#define RT_HEAP_SIZE 5*1024//1536
//static uint32_t rt_heap[RT_HEAP_SIZE];	// heap default size: 6K(1536 * 4)
RT_WEAK void *rt_heap_begin_get(void)
{
//    return rt_heap;
    return (void *)0x10000000;
}

RT_WEAK void *rt_heap_end_get(void)
{
//    return rt_heap + RT_HEAP_SIZE;
    return (void *)(0x10000000+64*1024/4);
}
#endif



void mpu_init(void)
{
	//选择0号region
	MPU->RNR=0;
	//选择基地址
	MPU->RBAR=0x00000000;
	//设置属性及容量
	MPU->RASR=((0x3)<<MPU_RASR_AP_Pos)|((31)<<MPU_RASR_SIZE_Pos)|(0x5<<16)|1;
	//开启MPU
	MPU->CTRL=1;
}



/**
 * This function will initial your board.
 */
void rt_hw_board_init()
{	
	NVIC_SetVectorTable(NVIC_VectTab_FLASH,(u32)128*1024);		
	_SysTick_Config (SystemCoreClock/1000);
//	LED_Init();				// LED鍒濆鍖?
//	Usart_Config();		//	涓插彛鍒濆鍖?
//	SDRAM_Init();		 	// sdram瑕佸厛浜巈mwin涔嬪墠鍒濆鍖?
//	sFLASH_Init();
	//SPI_Flash_Init(); 
	mymem_init();
	rt_system_heap_init(rt_heap_begin_get(),rt_heap_end_get());
	irq_vector_init();
	mpu_init();
	Touch_Init();			// 瑙︽懜灞忓垵濮嬪寲
	USART3_Init();
	RANDOM_Init();
	USBD_InitAsVcp ( );

}

void OS_CPU_SysTickHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();

	rt_tick_increase();

	/* leave interrupt */
	rt_interrupt_leave();
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
__weak void SystemClock_Config(void)
{
}