/*
 * 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>
#include "libc.h"
#include "string.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;
}

void rt_hw_us_delay(rt_uint32_t us)
{
	u32 ticks;
	u32 told,tnow,tcnt=0;
	u32 reload=SysTick->LOAD;
	ticks=us;
	rt_enter_critical();
	told=SysTick->VAL;
	while(1)
	{
		tnow=SysTick->VAL;
		if(tnow!=told)
		{
			if(tnow<told)tcnt+=told-tnow;
			else tcnt+=reload-tnow+told;
			told=tnow;
			if(tcnt>=ticks)break;
		}
	};
	rt_exit_critical();
}


#endif

#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
RT_WEAK void *rt_heap_begin_get(void)
{
  return (void *)0x10000000;
}

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



void mpu_init(void)
{
	MPU->RNR=0;
	MPU->RBAR=0x00000000;
	MPU->RASR=((0x3)<<MPU_RASR_AP_Pos)|((31)<<MPU_RASR_SIZE_Pos)|(0x5<<16)|1;
	MPU->CTRL=1;
}

const libc_device_file *g_usart;


// 重新配置时钟，25m晶振如果要保证usb为48m，则主频最高只能配置为168m
void reconfig_clock(void) {
  RCC_ClocksTypeDef rcc = {0};
  // RCC_PLLConfig(RCC_PLLSource_HSE, 25, 336, 2, 7);
  RCC_GetClocksFreq(&rcc);
  SystemCoreClock = rcc.SYSCLK_Frequency;
}

/**
 * This function will initial your board.
 */
void rt_hw_board_init()
{
	// NVIC_SetVectorTable(NVIC_VectTab_FLASH,(u32)128*1024);
	NVIC_SetVectorTable(NVIC_VectTab_FLASH,(u32)0);
	reconfig_clock();
	_SysTick_Config (SystemCoreClock/1000);
	NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
	LED_Init();
	Usart_Config();
	SDRAM_Init();
	sFLASH_Init();
	mymem_init();
	rt_system_heap_init(rt_heap_begin_get(),rt_heap_end_get());
	// irq_vector_init();
	mpu_init();
	Touch_Init();
	USART3_Init();
	RANDOM_Init();
	// USBD_InitAsVcp ();
	g_usart = libc_find_dev("usart");
	g_usart->open();
}


void rt_hw_console_output(const char *str)
{
  /* empty console output */
	g_usart->write(str,strlen(str));
}



void SysTick_Handler(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)
{
}