蓝桥杯单片机第四届省赛

难点:1显示出水量:总出水量有小数点所以让总出水量*100，计算总出水量中断是以一毫秒为周期的，出水速度为100ml/秒，数码管显示:出水总量以升为单位，0.01升=10ml，所以每过100ms让总出水量加一。

 if(water_flag==1)
		 {
			 water_count++;
			 if(water_count>=100)
			 {
					water_count=0;
					water=water+1;
			 }

		 }

2显示总价:价格还是让价格*100显示；因为价格为0.5元/升，所以直接让总出水量除以2得到价格

main.c

#include <STC15F2K60S2.H>
#include <IIC.H>

unsigned char display_mode=1;//数码管显示界面
unsigned int  water;//总出水量
unsigned int  cost;//价格

unsigned int dianya;//电压
unsigned char ad(unsigned char add)//ad函数
{
	  unsigned char date;
		IIC_Start();
		IIC_SendByte(0X90);
	  IIC_WaitAck();
	  IIC_SendByte(add);
	  IIC_WaitAck();
	
		IIC_Start();
		IIC_SendByte(0X91);
	  IIC_WaitAck();
	  date=IIC_RecByte();
	  IIC_SendAck(1);
	  IIC_Stop();
	  
	  return date;
}
unsigned int ad_count;
void da_process()//用于读取采集电压
{
		if(ad_count>5)
		{
			ad_count=0;
			dianya=ad(0x01);
			dianya=dianya/51;
		}
}
void Device_ctrl(unsigned char p2date,unsigned char p0date)
{
		P0=p0date;
	  P2=P2&0x1f|p2date;
		P2&=0x1f;
}
unsigned char trig_btn;
unsigned char cont_btn;
unsigned int key_count;
bit water_flag;

void key_btn()//按键函数
{
		unsigned char readdate=P3^0xff;
	  trig_btn=readdate&(cont_btn^readdate);
	  cont_btn=readdate;

}

void key_process()//按键处理函数
{
		if(key_count>=5)
		{
			key_count=0;
			key_btn();
			if(trig_btn==0x08)//s4
			{
				
			}
			
			if(trig_btn==0x04)//s5
			{
				
			}
			
			if(trig_btn==0x02)//s6
			{
				display_mode=0;
				water_flag=0;
				cost=0.5*water;
				Device_ctrl(0xa0,0x00);
			}
			
			if(trig_btn==0x01)//s7
			{
				display_mode=1;
				water_flag=1;
			  Device_ctrl(0xa0,0x30);

			}
			
		}
}

unsigned char smg_display[8];
unsigned int  smg_count;
unsigned char smg_du[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};

void smg_show()//数码管函数
{
	  unsigned int i;
	  Device_ctrl(0xc0,0);
		Device_ctrl(0xe0,~smg_display[i]);
	  Device_ctrl(0xc0,0x01<<i);
	  i=(i+1)%8;
}

void smg_process()//数码管界面显示
{
		if(smg_count>=3)
		{
			smg_count=0;
			if(display_mode)
			{
				smg_display[0]=0x00;
				smg_display[1]=smg_du[0]|0x80;
				smg_display[2]=smg_du[5];
				smg_display[3]=smg_du[0];
				
				smg_display[4]=smg_du[water/1000];
				smg_display[5]=smg_du[water/100%10]|0x80;
				smg_display[6]=smg_du[water/10%10];
				smg_display[7]=smg_du[water%10];
			}
			else
			{
			  smg_display[0]=0x00;
				smg_display[1]=smg_du[0]|0x80;
				smg_display[2]=smg_du[5];
				smg_display[3]=smg_du[0];
				
				smg_display[4]=smg_du[cost/1000];
				smg_display[5]=smg_du[cost/100%10]|0x80;
				smg_display[6]=smg_du[cost/10%10];
				smg_display[7]=smg_du[cost%10];
			}
			
			
		
		}

}
unsigned int led_count;
void  led_process()//LED函数
{
			if(led_count>5)
			{
				led_count=0;
				
				if(dianya<1.25)
				{
					Device_ctrl(0x80,~0x01);
				}
				else
				{
					Device_ctrl(0x80,0xff);
				}
			}
}
void Timer2Init()		//1毫秒@12.000MHz
{
	AUXR |= 0x04;		//定时器时钟1T模式
	T2L = 0x20;		//设置定时初值
	T2H = 0xD1;		//设置定时初值
	AUXR |= 0x10;		//定时器2开始计时
	IE2|=0X04;
	EA=1;
}


void main()
{
		Timer2Init();
	  Device_ctrl(0x80,0xff);
	  Device_ctrl(0xa0,0x00);
		while(1)
		{
		 smg_process();
		 key_process();
		 da_process();
		 led_process();
		}
}

unsigned int water_count;
void water_process()
{
	   if(water_flag==1)
		 {
			 water_count++;
			 if(water_count>=100)
			 {
					water_count=0;
					water=water+1;
			 }

		 }
	   
}
void timer2service()  interrupt 12
{
	  smg_count++;
		smg_show();
	  ad_count++;
		water_process();
		key_count++;
    led_count++;
}

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;
    IIC_Delay(DELAY_TIME);
}

//发送应答或非应答信号
void IIC_SendAck(bit ackbit)
{
    SCL = 0;
    SDA = ackbit;  					
    IIC_Delay(DELAY_TIME);
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SCL = 0; 
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}

//等待应答
bit IIC_WaitAck(void)
{
    bit ackbit;
	
    SCL  = 1;
    IIC_Delay(DELAY_TIME);
    ackbit = SDA;
    SCL = 0;
    IIC_Delay(DELAY_TIME);
    return ackbit;
}

//I2C总线发送一个字节数据
void IIC_SendByte(unsigned char byt)
{
    unsigned char i;

    for(i=0; i<8; i++)
    {
        SCL  = 0;
        IIC_Delay(DELAY_TIME);
        if(byt & 0x80) SDA  = 1;
        else SDA  = 0;
        IIC_Delay(DELAY_TIME);
        SCL = 1;
        byt <<= 1;
        IIC_Delay(DELAY_TIME);
    }
    SCL  = 0;  
}

//I2C总线接收一个字节数据
unsigned char IIC_RecByte(void)
{
    unsigned char i, da;
    for(i=0; i<8; i++)
    {   
    	SCL = 1;
	IIC_Delay(DELAY_TIME);
	da <<= 1;
	if(SDA) da |= 1;
	SCL = 0;
	IIC_Delay(DELAY_TIME);
    }
    return da;    
}

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