《蓝桥杯真题》:2022单片机省赛第二场(第十三 / 13届第二场)

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实现代码

main.c

#include <STC15F2K60S2.H>
#include "iic.h"
#include "intrins.h"

#define uchar unsigned char 
#define uint unsigned int 

sbit TX = P1^0;  //发射引脚
sbit RX = P1^1;  //接收引脚

sbit L1 = P0^0;
sbit L2 = P0^1;
sbit L3 = P0^2;
sbit L8 = P0^7;

sbit S7 = P3^0;
sbit S6 = P3^1;
sbit S5 = P3^2;
sbit S4 = P3^3;

uchar jm = 0;
code uchar tab[] = 0xC0, 0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90, 0xff, 0xc1, 0x8c, 0xc3, 0x88;
//U P L A 11 12 13 14


//初始化为0,一次表示从左至右分别表示S5的参数选择为上限,超声波的连续测量标志不打开,L8灭
bit flag_para, flag_start, flag_L8 ;

float Vup = 4.5, Vdown = 0.5, Vrb2, Vdac;
uint dis = 5;

void sys_init();
void dac_pcf8591(uchar da);
uchar rd_pcf8591(uchar addr);
void Delay5ms();		//@12.000MHz
void Delay12us();		//@12.000MHz 用于延时与产生方波

void key_handle();
void delay_k(uchar t);
void Send_Sonic();//用于发送8个40kHz的方波
void Sonic_handle();
void led();
void dac_handle();

void dsp_smg_bit(uchar pos, val, dot);
void display();
void dsp_vol();
void dsp_para();
void dsp_dis();
void Delay1ms();		//@12.000MHz

void main()

	sys_init();
	while(1)
	
		Vrb2 = rd_pcf8591(0x43) * 5 / 255.0;//读取通道3的电压,要同时允许DAC
		key_handle();
		display();
		Sonic_handle();
		led();
		dac_handle();
	

void dac_handle()

	if (!flag_start)
	
		Vdac = 0.0;
	
	else 
	
		if (dis <= 20)
			Vdac = 1.0;
		else if (dis >= 80)
			Vdac = 5.0;
		else 
		
			Vdac = 1.0 / 15 * (dis - 20) + 1;
		
	
	dac_pcf8591((uchar)(Vdac * 51));

void led()

	if (0 == jm)
	
		P2 = (P2 & 0x1f) | 0x80;
		L1 = 0;
	
	else if (1 == jm)
	
		P2 = (P2 & 0x1f) | 0x80;
		L2 = 0;
	
	else if (2 == jm)
	
		P2 = (P2 & 0x1f) | 0x80;
		L3 = 0;
	
	
	if (flag_start)
	
		if (flag_L8)
		
			P2 = (P2 & 0x1f) | 0x80;
			L8 = 0;
		
		else 
		
			P2 = (P2 & 0x1f) | 0x80;
			L8 = 1;
		
	
	

void Sonic_handle()

	if (jm != 2)//电压上限、下限参数在参数调整过程中无效,通过 S4 按键退出参数界面时生效。
	
		flag_start = (Vrb2 > Vdown && Vrb2 < Vup);
	
	if (flag_start)//连续测量
	
		uint t = 0;
		Send_Sonic();
		AUXR &= 0XBF;
		TMOD &= 0X0F;
		TL1 = 0;
		TH1 = 0;
		TF1 = 0;
		
		TR1 = 1;
		while((RX == 1) && (TF1 == 0));//等待超声波信号返回(RX引脚变为低电平)或等超出测量范围
		TR1 = 0;
		if(TF1 == 0)  //正常范围内
		
			t = (TH1 << 8) | TL1;
			dis = t * 0.172 / 10;
		
		else
		
			TF1 = 0;
			dis = 999;
		
	

void Send_Sonic()

	uchar i;
	for (i = 0; i < 8; i++)
	
		TX = 1;
		Delay12us();
		TX = 0;
		Delay12us();
	


void Delay12us()		//@12.000MHz

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


void dsp_dis()

	dsp_smg_bit(1, 13, 0);
	if (flag_start)
	
		if (dis > 99)
			dsp_smg_bit(6, dis / 100 % 10, 0);
		if (dis > 9)
			dsp_smg_bit(7, dis / 10 % 10, 0);
		if (dis >= 0)
			dsp_smg_bit(8, dis % 10, 0);
	
	else 
	
		dsp_smg_bit(6, 14, 0);
		dsp_smg_bit(7, 14, 0);
		dsp_smg_bit(8, 14, 0);
	


void dsp_para()

	uchar x = (uchar)(Vup * 10);
	uchar y = (uchar)(Vdown * 10);
	dsp_smg_bit(1, 12, 0);
	
	dsp_smg_bit(4, x / 10, 1);
	dsp_smg_bit(5, x % 10, 0);
	
	dsp_smg_bit(7, y / 10, 1);
	dsp_smg_bit(8, y % 10, 0);

void dsp_vol()

	uint x = (uint)(Vrb2 * 100);
	dsp_smg_bit(1, 11, 0);
	dsp_smg_bit(6, x / 100, 1);
	dsp_smg_bit(7, x / 10 % 10, 0);
	dsp_smg_bit(8, x % 10, 0);

void dsp_smg_bit(uchar pos, val, dot)

	P2 = (P2 & 0x1f) | 0xc0;
	P0 = 1 << (pos - 1);
	
	P2 = (P2 & 0x1f) | 0xe0;
	if (!dot)
		P0 = tab[val];
	else
		P0 = tab[val] & 0x7f;
		
	Delay1ms();
	P0 = 0xff;
	P2 &= 0x1f;

void display()

	if (0 == jm)
		dsp_vol();
	else if(2 == jm)
		dsp_para();
	else if (1 == jm)
		dsp_dis();

void Delay1ms()		//@12.000MHz

	unsigned char i, j;

	i = 12;
	j = 169;
	do
	
		while (--j);
	 while (--i);


void delay_k(uchar t)

	while(t--)
		display();

void key_handle()

	if (!S7)//-
	
		delay_k(15);
		if (!S7)
		
			while(!S7)
				display();
			if (2 == jm)
			
				if (!flag_para)
				
					if (Vup > 0.5)
						Vup -= 0.5;
					else 
						Vup = 5.0;
				
				else 
				
					if (Vdown > 0.5)
						Vdown -= 0.5;
					else 
						Vdown = 5.0;
				
			
			///
		
	
	
	if (!S6)//+
	
		delay_k(15);
		if (!S6)
		
			if (2 == jm)
			
				if (!flag_para)
				
					if (Vup <= 4.5)
						Vup += 0.5;
					else 
						Vup = 0.5;
				
				else 
				
					if (Vdown <= 4.5)
						Vdown += 0.5;
					else 
						Vdown = 0.5;
				
			
			
			while(!S6)
				display();
		
	
	
	if (!S5)//参数选择
	
		delay_k(15);
		if (!S5)
		
			flag_para = !flag_para;
			while(!S5)
				display();
		
	
	if (!S4)//界面切换
	
		delay_k(15);
		if (!S4)
		
			if (++jm >= 3)
				jm = 0;
			if (2 == jm)
				flag_para = 0;
			while(!S4)
				display();
		
	

uchar rd_pcf8591(uchar addr)

	uchar da;
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	
	IIC_SendByte(addr);
	IIC_WaitAck();
	Delay12us();
	
	IIC_Start();
	IIC_SendByte(0x91);
	IIC_WaitAck();

	da = IIC_RecByte();
	IIC_SendAck(1);
	IIC_Stop();
	
	return da;

void dac_pcf8591(uchar da)

	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	
	IIC_SendByte(0x43);
	IIC_WaitAck();
	
	IIC_SendByte(da);
	IIC_WaitAck();
	IIC_Stop();
	Delay5ms();


void Delay5ms()		//@12.000MHz

	unsigned char i, j;

	i = 59;
	j = 90;
	do
	
		while (--j);
	 while (--i);


void timer0() interrupt 1

	static uchar i1;
	if (flag_start)
	
		if (++i1 == 2)
		
			i1 = 0;
			flag_L8 = !flag_L8;
		
	

void sys_init()

	P2 = (P2 & 0x1f) | 0xa0;
	P0 = 0xaf;
	
	P2 = (P2 & 0x1f) | 0x80;
	P0 = 0xff;
	P2 &= 0x1f;
	
	AUXR &= 0x7F;		//定时器时钟12T模式
	TMOD &= 0xF0;		//设置定时器模式
	TL0 = 0xB0;		//设置定时初值
	TH0 = 0x3C;		//设置定时初值
	TF0 = 0;		//清除TF0标志
	TR0 = 1;		//定时器0开始计时
	
	ET0 = 1;
	EA = 1;



iic.h

#ifndef _IIC_H
#define _IIC_H

#include <STC15F2K60S2.H>
#include "intrins.h"

sbit SDA = P2^1;
sbit SCL = P2^0;

void IIC_Start(void); 
void IIC_Stop(void);  
bit IIC_WaitAck(void);  
void IIC_SendAck(bit ackbit); 
void IIC_SendByte(unsigned char byt); 
unsigned char IIC_RecByte(void); 

#endif

iic.c

#include "iic.h"

#define DELAY_TIME 5

//I2C总线内部延时函数
void IIC_Delay(unsigned char i)

    do_nop_();
    while(i--);        


//I2C总线启动信号
void IIC_Start(void)

    SDA = 1;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 0;
    IIC_Delay(DELAY_TIME);
    SCL = 0;	


//I2C总线停止信号
void IIC_Stop(void)

    SDA = 0;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 1;
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