/**********************************************************************************
*                                                                                 *
*    文 件 名：main.c                                                             *
*    MCU Type：STC89C51  Fosc:11.0592MHz                                          *
*    功    能：步進電機驅動調速演示 (液晶屏顯示工作狀態和速度設置值)              *
*    創 建 者：宇航工作室                                                         *
*    創建日期：2007-05-03                                                         *
*    其他說明：S1啟動/停止，S5正/反轉，S9加速，S13減速。	  					  *
*			   在YH51-I單片機學習開發板上驗證通過                                 *
*              有什么問題歡迎來我們的學習論壇討論，祝你成功!                      *
**********************************************************************************/

#include <reg52.h>  
#include <intrins.h>

#define uchar unsigned char  
#define uint unsigned int  


bit ring_flag;
bit forward_flag;
bit backward_flag;

uchar speed_set_value;

uint speed_value;
uint local_speed_value;

extern void lcd_init();
extern uchar key_scan();
extern void renew_lcd_disp();



//========= 延時函數 ============
void delay_ms(uint s)
{
    uint x;
	for(s;s>0;s--)
    {
        x = 200;
        while(x--);
    }
}

//========= 系統初始化函數 ============
void sys_init()
{
	P0 = 0x00;
	TMOD = 0x11;
	TH0 = 0xfc;	//1ms
	TL0 = 0x66;
	TR0 = 1;
	ET0 = 1;
	EA = 1;
}


//========= 定時器0中斷服務函數 ============
void time0_int() interrupt 1
{
	TR0 = 0;
	TL0 = 0x66;
	TH0 = 0xfc;
	TR0 = 1;
	if(ring_flag)
	{
		if(local_speed_value!=0)
		{
			local_speed_value--;
		}
		else 
		{
			local_speed_value = speed_value;
			if(forward_flag)
			{
				P0 = _cror_(P0,1);
			}
			else if(backward_flag)
			{
				P0 = _crol_(P0,1);
			}	
		}
	}
}

//============= 改變速度參數 =================
void change_speed()
{
	switch(speed_set_value)
	{
		case 0: speed_value = local_speed_value = 1000;break;
		case 1: speed_value = local_speed_value = 40;break;
		case 2: speed_value = local_speed_value = 35;break;
		case 3: speed_value = local_speed_value = 30;break;
		case 4: speed_value = local_speed_value = 25;break;
		case 6: speed_value = local_speed_value = 20;break;
		case 7: speed_value = local_speed_value = 15;break;
		case 8: speed_value = local_speed_value = 10;break;
		case 9: speed_value = local_speed_value = 5;break;
		
	}
}

void main()
{
	uchar temp;
	sys_init();
	lcd_init();
	speed_value = 0;
	forward_flag = 1;
	speed_set_value = 4;
	change_speed();
	renew_lcd_disp();
	while(1)
	{
		temp = key_scan();
		if(temp==1) //啟動/停止
		{
			ring_flag = ~ring_flag;
			renew_lcd_disp();
			if(ring_flag)
			{
				P0 = 0x33;
			}
			else P0 = 0x00;
		}

		else if(temp==5) //正反轉
		{
			if(ring_flag)
			{
				forward_flag = ~forward_flag;
				backward_flag = ~backward_flag;
				renew_lcd_disp();
			}
		}

		else if(temp==9) //加速
		{
			if(speed_set_value<9)
			{
				speed_set_value++;
				change_speed();
				renew_lcd_disp();
			}
		}
		
		else if(temp==0x13) //減速
		{
			if(speed_set_value>0)
			{
				speed_set_value--;
				change_speed();
				renew_lcd_disp();
			}	
		} 
	}
}