蓝桥杯之单片机设计与开发（29）——2012_第三届_蓝桥杯_省赛——“自动售水机”

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2019年3月14日更新

越是简单的题也是容易出错！

审题错误：

1、题目要求读取光敏电阻电压值，应该读取PCF8591的AIN1数据，而我写的是读取RB2也就是AIN3的数据

2、题目要求出水量100ml/s，我写成了1L/s，更改定时器中断中数据

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这个题的编程部分，，，是真的简单！！！

1、题目

这个题真的没什么好说的，就一个AD和最基础的数码管显示，按键控制。

2、代码

main.c

#include 
#include "sys.h"

bit mode = 0;
bit flag_100ms = 0;
u8 price = 50;		//price 0.5元/L  价格和全部需要*100
u16 volume = 0, money = 0;

void main(void)
{
	u16 val;
	
	All_Init();
	Timer0Init();
	EA = 1;
	while(1)
	{
		//读取AD值控制LED程序
		if(flag_100ms)
		{
			flag_100ms = 0;
			val = Read_AIN(0x01);    //2019.3.14更新，更改为读取AIN1数据
			if(val < 125)
				Led_illume(0xfe);
			else
				Led_illume(0xff);
		}
		
		Key_press();
		Nixie_Show();
	}
}

sys.c

#include "sys.h"

void All_Init(void)
{
	P2 = (P2 & 0x1f) | 0x80;	//打开Y4C（LED）
	P0 = 0xff;			//关闭LED
	P2 = (P2 & 0x1f) | 0xe0;	//打开Y7C（数码管）
	P0 = 0xff;			//关闭数码管
	P2 = (P2 & 0x1f) | 0xa0;	//打开Y5C
	P0 = 0x00;			//关闭蜂鸣器、继电器
	P2 = P2 & 0x1f;			//关闭所有使能
}

void Timer0Init(void)		//2毫秒@11.0592MHz
{
	AUXR |= 0x80;		//定时器时钟1T模式
	TMOD &= 0xF0;		//设置定时器模式
	TL0 = 0x9A;		//设置定时初值
	TH0 = 0xA9;		//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;
}

void Timer0(void) interrupt 1
{
	static u8 T0count1 = 0, T0count2 = 0;
	
	//控制接水程序
	if(mode == 1)
	{
		T0count1 ++;
		if(T0count1 >= 50)    //2019.3.14更新，原本是5改为现在的50,
		{
			T0count1 = 0;
			volume ++;
		}
	}
	
	//100ms计时控制程序
	T0count2 ++;
	if(T0count2 >= 50)
	{
		T0count2 = 0;
		flag_100ms = 1;
	}
	
	//继电器控制程序
	if(mode == 1)
	{
		if(volume < 9999)
		{
			P0 = 0x00;
			P2 = (P2 & 0x1f) | 0xa0;	//打开Y5C
			P04 = 1;
			P2 = P2 & 0x1f;			//关闭所有使能
		}
		else if(volume >= 9999)
		{
			mode = 0;
			money = volume / 2;
			volume = 0;
		}
	}
	else
	{
		P0 = 0x00;
		P2 = (P2 & 0x1f) | 0xa0;	//打开Y5C
		P04 = 0;
		P2 = P2 & 0x1f;			//关闭所有使能
	}
	
	Key_Scan();
	Nixie_Scan();
}

sys.h

#ifndef _SYS_H_
#define _SYS_H_

typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;

#include 
#include 
#include "iic.h"

extern bit mode;
extern bit flag_100ms;
extern u8 price;
extern u16 money, volume;

void All_Init(void);
void Timer0Init(void);

void Key_Scan(void);
void Key_drive(u8 key);
void Key_press(void);

void Nixie_Scan(void);
void Nixie_Show(void);
void Led_illume(u8 dat);


#endif

display.c

#include "sys.h"

u8 code Nixie[] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 
									0x80, 0x90, 0x88, 0x83, 0xc6, 0xa1, 0x86, 0x8e, 
									0xff, 0xbf};	//共阳数码管码字
u8 NixieBuff[] = {0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};	//数码管显示缓冲区，初值0xff确保启动时都不亮

u8 smg1,smg2,smg3,smg4,smg5,smg6,smg7,smg8;

//数码管显示
void Nixie_Scan(void)
{
	static u8 index = 0;
	
	P2 = (P2 & 0x1f) | 0xe0;	//数码管消隐
	P0 =0xff;
	
	P2 = (P2 & 0x1f) | 0xc0;	//数码管片选
	P0 = 0x01 << index;
	
	P2 = (P2 & 0x1f) | 0xe0;	//数码管段选
	P0 = NixieBuff[index];
	P2 &= 0x1f;
	index ++;
	index &= 0x07;
}

//数码管显示
void Nixie_Show(void)
{
	if(mode == 0)
	{
		smg1 = 16;
		smg2 = price / 100;
		smg3 = (price % 100) / 10;
		smg4 = price % 10;
		smg5 = money / 1000;
		smg6 = (money % 1000) / 100;
		smg7 = (money % 100) / 10;
		smg8 = money % 10;
	}
	else if(mode == 1)
	{
		smg1 = 16;
		smg2 = price / 100;
		smg3 = (price % 100) / 10;
		smg4 = price % 10;
		smg5 = volume / 1000;
		smg6 = (volume % 1000) / 100;
		smg7 = (volume % 100) / 10;
		smg8 = volume % 10;
	}

	NixieBuff[0] = Nixie[smg1];
	NixieBuff[1] = Nixie[smg2] & 0x7f;
	NixieBuff[2] = Nixie[smg3];
	NixieBuff[3] = Nixie[smg4];
	NixieBuff[4] = Nixie[smg5];
	NixieBuff[5] = Nixie[smg6] & 0x7f;
	NixieBuff[6] = Nixie[smg7];
	NixieBuff[7] = Nixie[smg8];
}

void Led_illume(u8 dat)
{
	P0 = 0xff;
	P2 = (P2 & 0x1f) | 0x80;	//打开Y4C（LED）
	P0 = dat;					//点亮LED
	P2 = P2 & 0x1f;
}

key.c

#include "sys.h"

u8 KeySta[] = {1, 1, 1, 1};			//键值存储区
u8 Keybackup[] = {1, 1, 1, 1};	//键值备份区

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

//按键扫描函数，在定时器中断里调用
void Key_Scan(void)
{
	static u8 Keybuff[] = {0xff, 0xff, 0xff, 0xff};	//按键缓冲区
	u8 i = 0;
	
	Keybuff[0] = (Keybuff[0] << 1) | S7;
	Keybuff[1] = (Keybuff[1] << 1) | S6;
	Keybuff[2] = (Keybuff[2] << 1) | S5;
	Keybuff[3] = (Keybuff[3] << 1) | S4;
	
	for(i = 0; i < 4; i++)
	{
		if(Keybuff[i] == 0xff)				//按键松开
			KeySta[i] = 1;
		else if(Keybuff[i] == 0x00)		//按键按下
			KeySta[i] = 0;
		else				//键值不稳定
		{}
	}
}

void Key_drive(u8 key)
{
	if(key == 0)					//S7 开始接水
		mode = 1;
	else if((key == 1) && (mode == 1))			//S6 停止接水
	{
		mode = 0;
		money = volume / 2;
		volume = 0;
	}
}

//检测按键是否按下，在main函数调用
void Key_press(void)
{
	u8 i;
	
	for(i = 0; i < 4; i ++)
	{
		if(KeySta[i] != Keybackup[i])
		{
			if(Keybackup[i] != 0)		//按键松开时操作
				Key_drive(i);
			Keybackup[i] = KeySta[i];
		}
	}
}

iic.c

#include "sys.h"

#define somenop {_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();}    

//总线引脚定义
sbit SDA = P2^1;  /* 数据线 */
sbit SCL = P2^0;  /* 时钟线 */

//总线启动条件
void IIC_Start(void)
{
	SDA = 1;
	SCL = 1;
	somenop;
	SDA = 0;
	somenop;
	SCL = 0;	
}

//总线停止条件
void IIC_Stop(void)
{
	SDA = 0;
	SCL = 1;
	somenop;
	SDA = 1;
}

//应答位控制
void IIC_Ack(bit ackbit)
{
	if(ackbit) 
	{	
		SDA = 0;
	}
	else 
	{
		SDA = 1;
	}
	somenop;
	SCL = 1;
	somenop;
	SCL = 0;
	SDA = 1; 
	somenop;
}

//等待应答
bit IIC_WaitAck(void)
{
	SDA = 1;
	somenop;
	SCL = 1;
	somenop;
	if(SDA)    
	{   
		SCL = 0;
		IIC_Stop();
		return 0;
	}
	else  
	{ 
		SCL = 0;
		return 1;
	}
}

//通过I2C总线发送数据
void IIC_SendByte(unsigned char byt)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{   
		if(byt&0x80) 
		{	
			SDA = 1;
		}
		else 
		{
			SDA = 0;
		}
		somenop;
		SCL = 1;
		byt <<= 1;
		somenop;
		SCL = 0;
	}
}

//从I2C总线上接收数据
unsigned char IIC_RecByte(void)
{
	unsigned char da;
	unsigned char i;
	
	for(i=0;i<8;i++)
	{   
		SCL = 1;
		somenop;
		da <<= 1;
		if(SDA) 
		da |= 0x01;
		SCL = 0;
		somenop;
	}
	return da;
}

unsigned char Read_AIN(unsigned char chn)
{
	unsigned char dat;
	unsigned int val;
	EA = 0;
	IIC_Start();						//IIC总线起始信号							
	IIC_SendByte(0x90);			//PCF8591的写设备地址		
	IIC_WaitAck();  		    //等待从机应答		
	IIC_SendByte(chn); 			//写入PCF8591的控制字节		
	IIC_WaitAck();  				//等待从机应答						
	IIC_Stop(); 						//IIC总线停止信号					
	
	IIC_Start();						//IIC总线起始信号									
	IIC_SendByte(0x91); 	  //PCF8591的读设备地址		
	IIC_WaitAck(); 			    //等待从机应答		
	dat = IIC_RecByte();	  //读取PCF8591通道3的数据 			
	IIC_Ack(0); 						//产生非应答信号				
	IIC_Stop(); 						//IIC总线停止信号		
	val = (dat * 500) / 255;
	EA = 1;

	return val;	
}

iic.h

#ifndef _IIC_H
#define _IIC_H

//函数声明
void IIC_Start(void); 
void IIC_Stop(void);  
void IIC_Ack(bit ackbit); 
void IIC_SendByte(unsigned char byt); 
bit IIC_WaitAck(void);  
unsigned char IIC_RecByte(void); 
unsigned char Read_AIN(unsigned char chn);

#endif