void TIM2_Delay(int time)
{
	Macro_Set_Bit(RCC->APB1ENR, 0);

	// TIM2 CR1 설정: down count, one pulse

	// PSC 초기값 설정 => 20usec tick이 되도록 설계 (50KHz)

	// ARR 초기값 설정 => 요청한 time msec에 해당하는 초기값 설정

	// UG 이벤트 발생

	// Update Interrupt Pending Clear

	// Update Interrupt Enable

	// TIM2 start

	// Wait timeout

	// Stop and Power off
	Macro_Clear_Bit(TIM2->CR1, 0);
	Macro_Clear_Bit(TIM2->DIER, 0);
}

#include "device_driver.h"

#define TIM2_TICK         	(20) 				// usec
#define TIM2_FREQ 	  		(1000000/TIM2_TICK)	// Hz
#define TIME2_PLS_OF_1ms  	(1000/TIM2_TICK)
#define TIM2_MAX	  		(0xffffu)

#define TIM4_TICK	  		(20) 				// usec
#define TIM4_FREQ 	  		(1000000/TIM4_TICK) // Hz
#define TIME4_PLS_OF_1ms  	(1000/TIM4_TICK)
#define TIM4_MAX	  		(0xffffu)

void TIM2_Stopwatch_Start(void)
{
	Macro_Set_Bit(RCC->APB1ENR, 0);

	TIM2->CR1 = (1<<4)|(1<<3);
	TIM2->PSC = (unsigned int)(TIMXCLK/50000.0 + 0.5)-1;
	TIM2->ARR = TIM2_MAX;

	Macro_Set_Bit(TIM2->EGR,0);
	Macro_Set_Bit(TIM2->CR1, 0);
}

unsigned int TIM2_Stopwatch_Stop(void)
{
	unsigned int time;

	Macro_Clear_Bit(TIM2->CR1, 0);
	time = (TIM2_MAX - TIM2->CNT) * TIM2_TICK;
	return time;
}

#if 1

/* Delay Time Max = 65536 * 20use = 1.3sec */

void TIM2_Delay(int time)
{
	Macro_Set_Bit(RCC->APB1ENR, 0);

	TIM2->CR1 = (1<<4)|(1<<3);
	TIM2->PSC = (unsigned int)(TIMXCLK/(double)TIM2_FREQ + 0.5)-1;
	TIM2->ARR = TIME2_PLS_OF_1ms * time;

	Macro_Set_Bit(TIM2->EGR,0);
	Macro_Clear_Bit(TIM2->SR, 0);
	Macro_Set_Bit(TIM2->DIER, 0);
	Macro_Set_Bit(TIM2->CR1, 0);

	while(Macro_Check_Bit_Clear(TIM2->SR, 0));

	Macro_Clear_Bit(TIM2->CR1, 0);
	Macro_Clear_Bit(TIM2->DIER, 0);
}

#endif

#if 0

/* Delay Time Extended */

void TIM2_Delay(int time)
{
	int i;
	unsigned int t = TIME2_PLS_OF_1ms * time;

	Macro_Set_Bit(RCC->APB1ENR, 0);

	TIM2->PSC = (unsigned int)(TIMXCLK/(double)TIM2_FREQ + 0.5)-1;
	TIM2->CR1 = (1<<4)|(1<<3);
	TIM2->ARR = 0xffff;
	Macro_Set_Bit(TIM2->EGR,0);
	Macro_Set_Bit(TIM2->DIER, 0);

	for(i=0; i<(t/0xffffu); i++)
	{
		Macro_Set_Bit(TIM2->EGR,0);
		Macro_Clear_Bit(TIM2->SR, 0);
		Macro_Set_Bit(TIM2->CR1, 0);
		while(Macro_Check_Bit_Clear(TIM2->SR, 0));
	}

	TIM2->ARR = t % 0xffffu;
	Macro_Set_Bit(TIM2->EGR,0);
	Macro_Clear_Bit(TIM2->SR, 0);
	Macro_Set_Bit(TIM2->CR1, 0);
	while (Macro_Check_Bit_Clear(TIM2->SR, 0));

	Macro_Clear_Bit(TIM2->CR1, 0);
	Macro_Clear_Bit(TIM2->DIER, 0);
}

#endif