蓝桥杯单片机历年初赛真题练习第三届—自动售水机
文章目录
前言
我参加了第十二届蓝桥杯单片机比赛,马马虎虎,拿了省一进了国赛。现在考研结束了,有时间就想把备赛的练习分享一下。我学习的是DK的编程风格和思路,所有代码都是自己码的(大家不要依赖复制粘贴,要不然考场上会出问题的),所以有少许bug(当时没影响功能就没改),分享的目的是记录一下此次竞赛。同时也希望能够帮助到正在备赛的同学们,更欢迎大家批评指正。
一、题目要求
(相信你们都有题目吧,这里怕侵权就不放了)
二、具体代码
1.驱动部分
本次使用的是iic
代码如下(iic.c)
/*
程序说明: IIC总线驱动程序
软件环境: Keil uVision 4.10
硬件环境: CT107单片机综合实训平台 8051,12MHz
日 期: 2011-8-9
*/
#include "stc15.h"
#include "intrins.h"
#define DELAY_TIME 40
#define SlaveAddrW 0xA0
#define SlaveAddrR 0xA1
//总线引脚定义
sbit SDA = P2^1; /* 数据线 */
sbit SCL = P2^0; /* 时钟线 */
void IIC_Delay(unsigned char i)
{
do{_nop_();}
while(i--);
}
//总线启动条件
void IIC_Start(void)
{
SDA = 1;
SCL = 1;
IIC_Delay(DELAY_TIME);
SDA = 0;
IIC_Delay(DELAY_TIME);
SCL = 0;
}
//总线停止条件
void IIC_Stop(void)
{
SDA = 0;
SCL = 1;
IIC_Delay(DELAY_TIME);
SDA = 1;
IIC_Delay(DELAY_TIME);
}
发送应答
//void IIC_SendAck(bit ackbit)
//{
// SCL = 0;
// SDA = ackbit; // 0:应答,1:非应答
// 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;
}
//通过I2C总线发送数据
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;
}
//从I2C总线上接收数据
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;
}
unsigned char AD_Read (unsigned char add)
{
unsigned char dat=0;
IIC_Start();
IIC_SendByte(0x90);
IIC_WaitAck();
IIC_SendByte(add);
IIC_WaitAck();
IIC_Stop();
IIC_Start();
IIC_SendByte(0x91);
IIC_WaitAck();
dat = IIC_RecByte();
IIC_Stop();
return dat;
}
iic.h
#ifndef _IIC_H
#define _IIC_H
#define uint unsigned int
#define uchar unsigned char
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);
uchar AD_Read(uchar add);
#endif
2.主程序部分
代码如下:
#include <stc15.h>
#include "iic.h"
#define uint unsigned int
#define uchar unsigned char
uchar yi,er,san,si,wu, liu,qi,ba;
uchar code com[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
uchar code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff, 0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};
uchar t = 0,L=0;
uint ml=0,money=0;
uchar s7=0,s6=0;
void allinit();
void delay(uint ms);
void smg_display(uchar yi,uchar er,uchar san,uchar si,uchar wu,uchar liu, uchar qi,uchar ba);
void Timer0Init(void); //5毫秒@11.0592MHz
void keyscan();
void led();
void main()
{
allinit();
Timer0Init();
yi=11,er=11,san=11,si=11,wu=11,liu=11,qi=11,ba=11;
while(1)
{
L=AD_Read(0x01);
led();
if(s7==1)
{
s7=0;
EA=1;ET0=1;
P2=0XA0;P0=0X10;
yi= 11,er=12,san=5,si=0;
}
else if(s6==1)
{
s6=0;
ET0=EA=0,P2=0xa0;P0=0x00;
money = ml*0.5;
yi=11,er=12,san=5,si=0,wu=money/1000,liu=money%1000/100+12,qi=money%100/10,ba=money%10;
ml=0;
}
keyscan();
smg_display( yi,er,san,si,wu,liu,qi,ba);
}
}
void allinit()
{
P2=0XA0;
P0=0X00;
P2=0X80;
P0=0XFF;
P2=0XC0;
P0=0XFF;
P0=0XFF;
P0=0XFF;
}
void delay(uint ms)
{
uint a,b;
for(a=ms;a>0;a--)
for(b=810;b>0;b--);
}
void smg_display(uchar yi,uchar er,uchar san,uchar si,uchar wu,uchar liu,uchar qi,uchar ba)
{
uchar i;
for(i = 0; i<8; i++)
{
P2 = 0xc0;
P0 = com[i];
P2 = 0xff;
switch(i)
{
case 0:P0 = tab[yi];break;
case 1:P0 = tab[er];break;
case 2:P0 = tab[san];break;
case 3:P0 = tab[si];break;
case 4:P0 = tab[wu];break;
case 5:P0 = tab[liu];break;
case 6:P0 = tab[qi];break;
case 7:P0 = tab[ba];break;
}
delay(1);
}
if(i == 8)
i = 0;
}
void Timer0Init(void) //5毫秒@11.0592MHz
{
AUXR |= 0x80; //定时器时钟1T模式
TMOD &= 0xF0; //设置定时器模式
TL0 = 0x00; //设置定时初值
TH0 = 0x28; //设置定时初值
TF0 = 0; //清除TF0标志
TR0 = 1; //定时器0开始计时
}
void Timer0() interrupt 1
{
t++;
if(t == 20)
{
t=0;
ml=ml+1;
wu=ml/1000;
liu=ml%1000/100 + 12;
qi=ml%100/10;
ba=ml%10;
if(ml==9999)
{
ET0=EA=0,s7=0;P2=0xa0;P0=0x00;
money = ml*0.5;
yi= 11,er=12,san=5,si=0,wu=money/1000,liu=money%1000/100+12,qi=money%100/10,ba=money%10;
ml=0;
}
}
}
void keyscan()
{
if(P30==0)
{
delay(5);
if(P30==0)
{
s7 = 1;
}
while(!P30);
}
if(P31==0)
{
delay(5);
if(P31==0)
{
s6 = 1;
}
while(!P31);
}
}
void led()
{
if(L<=64)
{
P2=0X80;P0=0XFE;
}
else
{
P2=0X80;P0=0XFf;
}
}