【蓝桥杯单片机】第十四届模拟二

最新推荐文章于 2025-06-24 16:42:46 发布

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#蓝桥杯 #单片机

该代码段展示了一个基于REGX52微控制器的程序，主要功能包括初始化定时器2用于参数定时，设置键盘扫描函数KeyScan来检测按键输入，使用串口通信UartInit进行数据发送和接收，以及显示和控制LED。定时器中断处理函数Timer2_Isr中更新了显示和按键状态。程序还实现了超声波测距功能Dis_measure。

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main.c（这次模拟题无其他驱动函数）

#include <REGX52.H>
#include <intrins.H>
#include <stdio.H>

#define u8 unsigned char 
#define u16 unsigned int
#define LED(X) {hc573(0);P0 = X;hc573(4);hc573(0);}
#define BUZ(X) {hc573(0);P0 = X;hc573(5);hc573(0);}
#define COM(X) {hc573(0);P0 = X;hc573(6);hc573(0);}
#define SMG(X) {hc573(0);P0 = X;hc573(7);hc573(0);}

sfr  P4 = 0xc0;
sfr AUXR = 0x8e;
sfr T2H=0xD6;
sfr T2L=0xD7;
sfr IE2=0xaf;
sbit R1 = P4^4;
sbit R2 = P4^2;
sbit C1 = P3^0;
sbit C2 = P3^1;
sbit C3 = P3^2;
sbit TX = P1^0;
sbit RX = P1^1;
code u8 Seg_Table[] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff,0xc1};
u16 cs=30,flag_s,flag_L3,s;
u8 flag_key,flag_tab,a,flag_led,tab[8]={10},ui,flag_taskkey,keystatus,keyvalue,dat,led=0xff;
//================================函数声明区=============================
void Delay12us();		//@12.000MHz
void hc573(u8 channel);
void Timer2_Init(void);
void display();
char putchar(char c);
void SendByte(u8 date);
//======================================================================
void Delay12us()		//@12.000MHz
{
	unsigned char i;

	_nop_();
	_nop_();
	i = 33;
	while (--i);

}

void hc573(u8 channel)
{
	switch(channel)
	{
		case 4: P2 = (P2&0x1f)|0x80; break;
		case 5: P2 = (P2&0x1f)|0xa0; break;
		case 6: P2 = (P2&0x1f)|0xc0; break;
		case 7: P2 = (P2&0x1f)|0xe0; break;
		case 0: P2 = (P2&0x1f)|0x00; break;
	}
}
void Timer2_Isr(void) interrupt 12  //定时器2用作参数定时
{
	display();
	if(flag_key<20) ++flag_key;
	if(flag_tab<20) ++flag_tab;
	if(flag_taskkey<20) ++flag_taskkey;
	if(flag_s<500) ++flag_s;
	if(flag_led<30) ++flag_led;
	if(flag_L3<200) ++flag_L3;
}

void KeyScan()
{
	if(flag_key<20) return;
	flag_key = 0;
	TR1 = 0;
	switch(keystatus)
	{
		case 0:
			R1=0;R2=C1=C2=C3=1;
			if(C1==0||C2==0||C3==0) 
			{
				keystatus = 1;
				return;
			}
			R2=0;R1=C2=C3=C1=1;
			if(C1==0||C2==0) 
			{
				keystatus = 2;
				return;
			}
			break;
		case 1:
			if(C1 == 0)	keyvalue = 7;
			if(C2 == 0)	keyvalue = 6;
			if(C3 == 0)	keyvalue = 5;
		  keystatus = 3;
		break;
		case 2:
			if(C1 == 0)	keyvalue = 11;
			if(C2 == 0)	keyvalue = 10;
		  keystatus = 3;
		break;
		case 3:
			if(C1==1&&C2==1&&C3==1)
				keystatus = 0;
			break;
	 }
	TR1 = 1;
	 P3 = 0xff;
}

void taskKey()
{
	switch(keyvalue)
	{
		case 7: ui = (ui+1)%2;keyvalue=0;break;
		case 11:if(ui == 0)cs=s;keyvalue=0;break;
		case 6:if(ui==1)cs+=10;keyvalue=0;break;
		case 10:if(cs>0&&ui==1) cs-=10;keyvalue=0;break;
		case 5:ES=1;printf("Distance:%ucm",s);ES=0;keyvalue=0;break;
		default :keyvalue=0;break;
	}
}
void Settab()
{
	if(flag_tab<20) return;
	flag_tab = 0;
	switch(ui)
	{
		case 0:
			tab[0] = 11;
			tab[1] = 1;
			tab[2] = 10;
			tab[3] = 10;
			tab[4] = 10;
			tab[5] = s/100;
			tab[6] = s%100/10;
			tab[7] = s%10;
		break;
		case 1:
			tab[0] = 11;
			tab[1] = 2;
			tab[2] = 10;
			tab[3] = 10;
			tab[4] = 10;
			tab[5] = cs/100;
			tab[6] = cs%100/10;
			tab[7] = cs%10;
		break;
	}
}
void display()
{
	static u8 i;
	SMG(0xff);
	COM(0x01<<i);
	SMG(Seg_Table[tab[i]]);
	i = (i+1)%8;
}
void Timer2_Init(void)//定时器2用作参数定时
{
	AUXR &= 0xFB;			//定时器时钟12T模式
	T2L = 0x18;				//设置定时初始值
	T2H = 0xFC;				//设置定时初始值
	AUXR |= 0x10;			//定时器2开始计时
	IE2 |= 0x04;			//使能定时器2中断
	EA = 1;
}
void SendWave()
{
	u8 i;
	for(i=0;i<=7;i++)
	{
		TX = 1;
		Delay12us();
		TX = 0;
		Delay12us();
	}
}
void Dis_measure()
{
	if(flag_s<500) return;
	flag_s = 0;
	TMOD &= 0xF0;			//定时器0用作测距
	TL0 = 0x00;				//设置定时初始值
	TH0 = 0x00;				//设置定时初始值
	TF0 = 0;				//清除TF1标志
	TR0 = 0;			
	
	SendWave();
	TR0 = 1;
	while(RX==1&&TF0==0);
	TR0 = 0;
	if(TF0==1) 
	{
		s = 255;
	}
	if(RX==0)
	{
		s = (TH0<<8|TL0)*0.017;
	}
}


void UartInit(void)		//定时器1用作串口
{
	SCON = 0x50;		//8位数据,可变波特率
	AUXR |= 0x40;		//定时器时钟1T模式
	AUXR &= 0xFE;		//串口1选择定时器1为波特率发生器
	TMOD &= 0x0F;		//设置定时器模式
	TL1 = 0xC7;			//设置定时初始值
	TH1 = 0xFE;			//设置定时初始值
	ET1 = 0;			//禁止定时器中断
	TR1 = 1;			//定时器1开始计时
}

void Receive() interrupt 4
{
	if(RI == 1)
	{
		RI = 0;
		dat = SBUF;
	}
}

void SendByte(u8 date)
{
	SBUF = date;
	while(TI == 0);
	TI = 0;
}

char putchar(char c)
{
	SendByte(c);
	return c;
}


void LED_control()
{
	if(flag_led<30) return;
	flag_led=0;
 	if(ui == 0) led&=~1;
	else led|=1;
	if(ui == 1) led&=~2;
	else led|=2;
	LED(led)
}
void L3()
{
	if(flag_L3<200) return;
	else flag_L3=0;
	if(s>cs) 
		led^=4;
	else led |= 4;
	LED(led);
}
void main()
{
	BUZ(0x00);
	LED(0xff);
	Timer2_Init();
	UartInit();
	while(1)
	{
		Settab();
		taskKey();
		KeyScan();
		Dis_measure();
		LED_control();
		L3();
	}
}