8051 exam2

exam_2.c

/*
 * exam_2.c
 *
 * Created: 2012/11/16 下午 16:10:10
 *  Author: Jason YiZhang Chen
 */

#include <reg51.h>
//++++++++++++++++++++++++++++++中斷控制+++++++++++++++++++++++++++++++++//
#define __INT0_SWITCH__		0		//INT0   中斷開關		0關		1開
#define __INT0_TRIGGER__	1		//INT0   觸發方式		0低準位		1負緣
#define __INT0_IP__			0	//INT0   優先權		0不具優先	1具優先

#define __INT1_SWITCH__		1		//INT1   中斷開關		0關		1開
#define __INT1_TRIGGER__	1		//INT1   觸發方式		0低準位		1負緣
#define __INT1_IP__			0	//INT1   優先權		0不具優先	1具優先

#if __INT0_SWITCH__ == 1			//根據開啟INT0或INT1改變中斷向量代號
	#define __INT_VECTOR__	0
#else
	#define __INT_VECTOR__	2
#endif

#define __TIMER1_SWITCH__	1		//TIMER1 中斷開關		0關	1開
#define __TIMER1_IP__		0		//TIMER1 優先權		0不具優先	1具優先
//++++++++++++++++++++++++++++++七段控制+++++++++++++++++++++++++++++++++//
#define SEG0			0			//組別0
#define SEG1			10			//組別A (A=10 ~ F=15 )
#define SEG2			1			//組別1
#define SEG3			1			//組別1
#define __SHIFT__		0			//移動控制	0:左移	1:右移
#define	__INCDEC__		1			//計數控制	0:上數	1:下數
#define __SECINIT__		25			//秒數初值(0~59)
#define __MININIT__		10			//分數初值(0~59)
//++++++++++++++++++++++++++++++PORT定義+++++++++++++++++++++++++++++++++//
#define LED 		P0				//七段資料線
#define LEDP		P1				//七段掃瞄線
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//
#define T			50000			//timer記數次數
//++++++++++++++++++++++++++++++FUNCTION+++++++++++++++++++++++++++++++++//
void init();
void inc_time();
void display();
void set_display(unsigned char, unsigned char, unsigned char, unsigned char);
void delay_ms(unsigned int);
//++++++++++++++++++++++++++++++VARIABLE+++++++++++++++++++++++++++++++++//
unsigned char code Table[] = {  ~0x3f, ~0x06, ~0x5b, ~0x4f,
				~0x66, ~0x6d, ~0x7d, ~0x07,
				~0x7f, ~0x6f, ~0x77, ~0x7c,
				~0x39, ~0x5e, ~0x79, ~0x71  };
unsigned char shift = 0, shiftSet = 0;			//左移, 左移旗標
unsigned char displayText[4];
char min = __MININIT__, sec = __SECINIT__;
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++//
void main() {
	set_display(Table[min/10], Table[min%10], Table[sec/10], Table[sec%10]);
	init();
	while(1)
	{
		display();
	}
}

void init() {
	EA = 0;				//中斷關閉
	P3 = 0xff;
	/***************IE***************/
	EX0 = __INT0_SWITCH__;
	EX1 = __INT1_SWITCH__;
	ET1 = __TIMER1_SWITCH__;
	/***************TCON***************/
	IT0 = __INT0_TRIGGER__;
	IT1 = __INT1_TRIGGER__;
	/***************IP***************/
	PX0 = __INT0_IP__;
	PX1 = __INT1_IP__;
	PT1 = __TIMER1_IP__;
	/***************TIMER1設定***************/
	TMOD = 0x10;			//TIMER1 16位元計時器
	TR1 = 0;
	TH1 = (65536 - T) / 256;
	TL1 = (65536 - T) % 256;
	TR1 = 1;
	EA = 1;
}

void timer1() interrupt 3 {
	static unsigned int i = 0, count = 0, countTime = 0;

	TR1 = 0;
	if(++i == 20) {
		i = 0;
		inc_time();
		if(shiftSet == 0)
			set_display(Table[min/10], Table[min%10], Table[sec/10], Table[sec%10]);
	}

	if(shiftSet == 1) {
		if(++count == 10) {
			count = 0;
			#if __SHIFT__ == 0
				++shift;
			#else
				--shift;
			#endif
			if(++countTime == 20) {
				countTime = 0;
				shiftSet = 0;
				shift = 0;
			}
		}
	}
	TH1 = (65536 - T) / 256;
	TL1 = (65536 - T) % 256;
	TR1 = 1;
}

void key_press_int() interrupt __INT_VECTOR__ {
	if(shiftSet == 0) {
		shiftSet = 1;
		shift = 0;
		set_display(Table[SEG0], Table[SEG1], Table[SEG2], Table[SEG3]);
	}
	else
		display();
}

void set_display(unsigned char s1, unsigned char s2, unsigned char s3, unsigned char s4) {
	displayText[0] = s1; displayText[1] = s2; displayText[2] = s3; displayText[3] = s4;
}

void display() {
	unsigned char i, j;

	for(j = 0; j < 250; j++) {
		for(i = 0; i < 4; i++) {
			LEDP = ~(0x08 >> i);
			switch (i) {
				case 0: LED = displayText[(0+shift)%4]; break;
				case 1: LED = displayText[(1+shift)%4]; break;
				case 2: LED = displayText[(2+shift)%4]; break;
				case 3: LED = displayText[(3+shift)%4]; break;
			}
			delay_ms(1);
			LED = 0xff;
		}
	}
}

void inc_time() {
#if __INCDEC__ == 0
	if(++sec == 60) {
		sec = 0;
		if(++min == 60) {
			min = __MININIT__;
			sec = __SECINIT__;
		}
	}
#else
	if(--sec == -1) {
		sec = 59;
		if(--min == -1) {
			min = __MININIT__;
			sec = __SECINIT__;
		}
	}
#endif
}

void delay_ms(unsigned int i) {
	int count;
	while(i != 0) {
		count = 120;
		while(count>0) count--;
		i--;
	}
}