该代码实现了一个基于单片机的系统，能够通过I2C和单总线协议读取温度传感器的数据，并显示在数码管上。系统包括电压、频率和温度测量功能，同时支持数据保存到EEPROM并在按键操作下切换显示模式。代码中包含了I2C通信、单总线驱动和按键处理等关键部分。
这次题目的功能全部实现了，但要注意的是onewire中温度的返回值要用int，因为值已经大于255了，保留了两位小数。如果有问题，欢迎提出！
题目
代码：
main.c
#include"reg52.h"
#include"intrins.h"
#include"iic.h"
#include"onewire.h"
sfr AUXR=0x8e;
int count_f;
int num_v;
int num_f;
int temperature;
int smg_mode;
int xian_mode;
int set_v=1;
int read_num_v;
int read_num_f;
int read_temperature;
int led=0xff;
int shan;
sbit S4=P3^3;
sbit S5=P3^2;
sbit S6=P3^1;
sbit S7=P3^0;
char code xianshi[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff,0xc1,0x8e,0xc6,0x89,0x8c,0x7f};
void smg_display();
void led_work();
void choose_573(int i)
{
switch(i)
{
case(0):P2=(P2&0x1f)|0x00;break;
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;
}
}
void init_system()
{
choose_573(4);
P0=0xff;
choose_573(5);
P0=0x00;
choose_573(0);
}
//================================iic and onewire
void get_v()
{
num_v=read_v();
}
void get_temperature()
{
temperature=rd_temperature();
}
//================================
//================================555 and 定时器
void Timer0Init(void) //100微秒@11.0592MHz
{
AUXR |= 0x80; //定时器时钟1T模式
TMOD = 0x04; //设置定时器模式
TL0 = 0xff; //设置定时初始值
TH0 = 0xff; //设置定时初始值
TF0 = 0; //清除TF0标志
TR0 = 1; //定时器0开始计时
ET0=1;
EA=1;
}
void timer0_server() interrupt 1
{
count_f++;
}
void Timer1Init(void) //5毫秒@11.0592MHz
{
AUXR |= 0x40; //定时器时钟1T模式
TMOD &= 0x0F; //设置定时器模式
TL1 = 0x00; //设置定时初始值
TH1 = 0x28; //设置定时初始值
TF1 = 0; //清除TF1标志
TR1 = 1; //定时器1开始计时
ET1=1;
EA=1;
}
int count_1;int count_2;int count_3;
void timer1_server() interrupt 3
{
count_1++;
if(count_1>=200)
{
num_f=count_f;
count_f=0;
count_1=0;
// get_v();
// get_temperature();
}
if(num_v>(set_v*10))
{
count_2++;
if(count_2>=40)
{
count_2=0;
if(shan==1)
{
shan=0;
}
else
{
shan=1;
}
}
}
else
{
shan=0;
}
if(S6==0&&smg_mode==2)
{
count_3++;
if(count_3>=160)
{
set_v=set_v+1;
if(set_v>=50)
{
set_v=1;
}
}
}
else
{
count_3=0;
}
}
//================================
//================================eeprom
void get_eeprom()
{
read_num_v=read_EEPROM(0x02);
read_num_v=(read_num_v<<8)|read_EEPROM(0x01);
read_num_f=read_EEPROM(0x04);
read_num_f=(read_num_f<<8)|read_EEPROM(0x03);
read_temperature=read_EEPROM(0x06);
read_temperature=(read_temperature<<8)|read_EEPROM(0x05);
}
//================================
//================================按键
void Delay10ms() //@11.0592MHz
{
unsigned char i, j;
i = 108;
j = 145;
do
{
while (--j);
} while (--i);
}
void key_board()
{
//S4
if(S4==0)
{
Delay10ms();
if(S4==0)
{
smg_mode=0;
xian_mode++;
if(xian_mode>=3)
{
xian_mode=0;
}
}
while(!S4)
{
smg_display();
led_work();
}
}
//S5
if(S5==0)
{
Delay10ms();
if(S5==0)
{
write_EEPROM(0x01,num_v);//低位
Delay10ms();
write_EEPROM(0x02,num_v>>8);//高位
Delay10ms();
write_EEPROM(0x03,num_f);//低位
Delay10ms();
write_EEPROM(0x04,num_f>>8);//高位
Delay10ms();
write_EEPROM(0x05,temperature);//低位
Delay10ms();
write_EEPROM(0x06,temperature>>8);//高位
Delay10ms();
}
while(!S5)
{
smg_display();
led_work();
}
}
//S6
if(S6==0)
{
Delay10ms();
if(S6==0)
{
if(smg_mode==2)
{
set_v++;
if(set_v>50)
{
set_v=1;
}
write_EEPROM(0x07,set_v);
}
else
{
smg_mode=1;
get_eeprom();
}
}
while(!S6)
{
smg_display();
led_work();
}
}
//S7
if(S7==0)
{
Delay10ms();
if(S7==0)
{
if(smg_mode==0)
{
smg_mode=2;
}
else
{
smg_mode=0;
}
}
while(!S7)
{
smg_display();
led_work();
}
}
}
//================================
//================================数码管
void Delay400us() //@11.0592MHz
{
unsigned char i, j;
i = 5;
j = 74;
do
{
while (--j);
} while (--i);
}
void SMG(int wei,int dat)
{
choose_573(6);
P0=0x80>>(wei-1);
choose_573(7);
P0=xianshi[dat];
choose_573(0);
Delay400us();
choose_573(7);
P0=xianshi[10];
choose_573(0);
}
void smg_display()
{
if(smg_mode==0)
{
if(xian_mode==0) //电压
{
SMG(1,(num_v%100)/10);
SMG(2,(num_v%1000)/100);
SMG(2,16);
SMG(3,10);
SMG(4,10);
SMG(5,10);
SMG(6,10);
SMG(7,10);
SMG(8,11);
}
if(xian_mode==1) //频率
{
SMG(1,num_f%10);
if(num_f>=10)
{
SMG(2,(num_f%100)/10);
}
else
{
SMG(2,10);
}
if(num_f>=100)
{
SMG(3,(num_f%1000)/100);
}
else
{
SMG(3,10);
}
if(num_f>=1000)
{
SMG(4,(num_f%10000)/1000);
}
else
{
SMG(4,10);
}
if(num_f>=10000)
{
SMG(5,(num_f%100000)/10000);
}
else
{
SMG(5,10);
}
if(num_f>=100000)
{
SMG(6,(num_f%1000000)/100000);
}
else
{
SMG(6,10);
}
if(num_f>=1000000)
{
SMG(7,(num_f%10000000)/1000000);
}
else
{
SMG(7,10);
}
SMG(8,12);
}
if(xian_mode==2) //温度
{
SMG(1,temperature%10);
SMG(2,(temperature%100)/10);
SMG(3,16);
SMG(3,(temperature%1000)/100);
if(temperature>=1000)
{
SMG(4,(temperature%10000)/1000);
}
else
{
SMG(4,10);
}
SMG(5,10);
SMG(6,10);
SMG(7,10);
SMG(8,13);
}
}
if(smg_mode==1)
{
if(xian_mode==0) //保存的电压
{
SMG(1,(read_num_v%100)/10);
SMG(2,(read_num_v%1000)/100);
SMG(2,16);
SMG(3,10);
SMG(4,10);
SMG(5,10);
SMG(6,10);
SMG(7,11);
SMG(8,14);
}
if(xian_mode==1) //保存的频率
{
SMG(1,read_num_f%10);
if(read_num_f>=10)
{
SMG(2,(read_num_f%100)/10);
}
else
{
SMG(2,10);
}
if(read_num_f>=100)
{
SMG(3,(read_num_f%1000)/100);
}
else
{
SMG(3,10);
}
if(read_num_f>=1000)
{
SMG(4,(read_num_f%10000)/1000);
}
else
{
SMG(4,10);
}
if(read_num_f>=10000)
{
SMG(5,(read_num_f%100000)/10000);
}
else
{
SMG(5,10);
}
if(read_num_f>=100000)
{
SMG(6,(read_num_f%1000000)/100000);
}
else
{
SMG(6,10);
}
SMG(7,12);
SMG(8,14);
}
if(xian_mode==2) //保存的温度
{
SMG(1,read_temperature%10);
SMG(2,(read_temperature%100)/10);
SMG(3,16);
SMG(3,(read_temperature%1000)/100);
if(read_temperature>=1000)
{
SMG(4,(read_temperature%10000)/1000);
}
else
{
SMG(4,10);
}
SMG(5,10);
SMG(6,10);
SMG(7,13);
SMG(8,14);
}
}
if(smg_mode==2)
{
SMG(1,set_v%10);
SMG(2,set_v/10);
SMG(2,16);
SMG(4,10);
SMG(5,10);
SMG(6,10);
SMG(7,10);
SMG(8,15);
}
}
//================================
//================================LED
void led_work()
{
if(smg_mode==0)
{
//L1
if(xian_mode==0)
{
led=(led&0xfe)|0x00;
choose_573(4);
P0=led;
choose_573(0);
}
else
{
led=(led&0xfe)|0x01;
choose_573(4);
P0=led;
choose_573(0);
}
//L2
if(xian_mode==1)
{
led=(led&0xfd)|0x00;
choose_573(4);
P0=led;
choose_573(0);
}
else
{
led=(led&0xfd)|0x02;
choose_573(4);
P0=led;
choose_573(0);
}
//L3
if(xian_mode==2)
{
led=(led&0xfb)|0x00;
choose_573(4);
P0=led;
choose_573(0);
}
else
{
led=(led&0xfb)|0x04;
choose_573(4);
P0=led;
choose_573(0);
}
}
//L8
if(shan==1)
{
led=(led&0x7f)|0x00;
choose_573(4);
P0=led;
choose_573(0);
}
else
{
led=(led&0x7f)|0x80;
choose_573(4);
P0=led;
choose_573(0);
}
}
//================================
void main()
{
init_system();
Timer0Init();
Timer1Init();
get_eeprom();
set_v=read_EEPROM(0x07);
while(1)
{
key_board();
smg_display();
get_v();
get_temperature();
led_work();
}
}
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 "reg52.h"
#include "intrins.h"
#define DELAY_TIME 5
#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;
}
int read_v()
{
int temp;
IIC_Start();
IIC_SendByte(0x90);
IIC_WaitAck();
IIC_SendByte(0x03);
IIC_WaitAck();
IIC_Stop();
IIC_Start();
IIC_SendByte(0x91);
IIC_WaitAck();
temp=IIC_RecByte();
IIC_SendAck(1);
IIC_Stop();
temp=temp*1.96+0.5;
return temp;
}
void write_EEPROM(int add,int dat)
{
IIC_Start();
IIC_SendByte(0xa0);
IIC_WaitAck();
IIC_SendByte(add);
IIC_WaitAck();
IIC_SendByte(dat);
IIC_WaitAck();
IIC_Stop();
}
int read_EEPROM(int add)
{
int temp;
IIC_Start();
IIC_SendByte(0xa0);
IIC_WaitAck();
IIC_SendByte(add);
IIC_WaitAck();
IIC_Start();
IIC_SendByte(0xa1);
IIC_WaitAck();
temp=IIC_RecByte();
IIC_SendByte(1);
IIC_Stop();
return temp;
}
iic.h
#ifndef _IIC_H
#define _IIC_H
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);
int read_v();
void write_EEPROM(int add,int dat);
int read_EEPROM(int add);
#endif
onewire.c
/*
程序说明: 单总线驱动程序
软件环境: Keil uVision 4.10
硬件环境: CT107单片机综合实训平台(外部晶振12MHz) STC89C52RC单片机
日 期: 2011-8-9
*/
#include "reg52.h"
sbit DQ = P1^4; //单总线接口
//单总线延时函数
void Delay_OneWire(unsigned int t) //STC89C52RC
{
t=t*12;
while(t--);
}
//通过单总线向DS18B20写一个字节
void Write_DS18B20(unsigned char dat)
{
unsigned char i;
for(i=0;i<8;i++)
{
DQ = 0;
DQ = dat&0x01;
Delay_OneWire(5);
DQ = 1;
dat >>= 1;
}
Delay_OneWire(5);
}
//从DS18B20读取一个字节
unsigned char Read_DS18B20(void)
{
unsigned char i;
unsigned char dat;
for(i=0;i<8;i++)
{
DQ = 0;
dat >>= 1;
DQ = 1;
if(DQ)
{
dat |= 0x80;
}
Delay_OneWire(5);
}
return dat;
}
//DS18B20设备初始化
bit init_ds18b20(void)
{
bit initflag = 0;
DQ = 1;
Delay_OneWire(12);
DQ = 0;
Delay_OneWire(80);
DQ = 1;
Delay_OneWire(10);
initflag = DQ;
Delay_OneWire(5);
return initflag;
}
unsigned int rd_temperature(void)
{
int temp;int LBS;int HBS;
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0x44);
Delay_OneWire(200);
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0xbe);
LBS=Read_DS18B20();
HBS=Read_DS18B20();
temp=(HBS<<8)|LBS;
temp=temp*6.25;
return temp;
}
onewire.h
#ifndef __ONEWIRE_H
#define __ONEWIRE_H
unsigned int rd_temperature(void); //; ;
void Delay_OneWire(unsigned int t);
void Write_DS18B20(unsigned char dat);
unsigned char Read_DS18B20(void);
bit init_ds18b20(void);
#endif
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