LM75A的数字温度计的规划

CPU：STC89C54RD+
晶震：11.0592M
A0 A1 A2 均接地 地址设置为0 OS脚和INT0相连并经过10K上拉到VCC；当转化温度超越极限温度，输出中止蜂鸣器报警；改写数码管显现温度 共5位前一位表明正负温度后三位为温度125 – -55 最终一位为0.1度 最高可准确到0.125 数码管图略定时器100MS收集温度一次

#include
#include
#include

sbit xiaoshu=P2^0; //COM口
sbit ge=P2^1;
sbit shi=P2^3;
sbit bai=P2^4;
sbit fh=P2^5;
sbit SDA_LM75=P1^0; //数据
sbit SCL_LM75=P1^1;
sbit BP=P2^1;
bit dp=0;
unsigned char JS=0;

#define LED P0 //8位数码管 动态不时改写

#define CONF 0X01 //装备寄存器
#define TEMP 0X00 //温度寄存器 只读
#define ALARM 0X03 //超温封闭极限寄存器默许5000H
#define DELAY 0X02 //滞后寄存器默许4B00H
#define WADDR 0X90 //写地址
#define RADDR 0X91 //读地址

unsigned int tempdata=0; //全局变量声明温度

unsigned char code tab[]={ 0x3f,0x30,0x6d,0x79,0x72,0x5b,0x5f,0x31,0x7f,0x7b,0x40};//共阴
//0, 1, 2 3 4 5 6 7 8 9
//unsigned char tab[]={ 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//共阳
//0, 1, 2 3 4 5 6 7 8 9

unsigned char code tabdp[]={ 0xbf,0xb0,0xed,0xf9,0xf2,0xdb,0xdf,0xb1,0xff,0xfb,0xc0};//共阴带小数点
//0, 1, 2 3 4 5 6 7 8 9
//unsigned char tabdp[]={ 0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};//共阳

void delay_xms(unsigned int count) //延时函数
{
register unsigned char j;
while (count –)
{
for (j=0;j<125;j++) //约1MS
{
}
}
}

void Led_Display(unsigned int i,bit mode) //显现函数
{
if(mode)
LED = 0x40; //共阴负
//LED=0xBF;
else
LED = 0x00;
//LED= 0XFF;
fh = 1;
bai = 0;
shi = 0;
ge = 0;
xiaoshu=0;
delay_xms(1);
LED = tab[i/1000];
i%=1000;
fh = 0;
bai = 1;
shi = 0;
ge = 0;
xiaoshu=0;
delay_xms(1);
LED = tab[i/100];
i%=100;
fh=0;
bai = 0;
shi = 1;
ge = 0;
xiaoshu=0;
delay_xms(1);
LED = tabdp[i/10]; //带小数点
fh=0;
bai = 0;
shi = 0;
ge = 1;
xiaoshu=0;
delay_xms(1);
LED = tab[i%10];
fh=0;
bai = 0;
shi = 0;
ge = 0;
xiaoshu=1;
delay_xms(1);
}

void delay(void) //延时函数
{
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
}

void start_lm75(void)//开始
{
SDA_LM75=1;
SCL_LM75=1;
delay();
SDA_LM75=0;
delay();
SCL_LM75=0;
}

void stop_lm75(void)//中止
{
SDA_LM75=0;
SCL_LM75=1;
delay();
SDA_LM75=1;
delay();
SCL_LM75=0;
}

void Check_Ack(void) //查看应对信号
{
SDA_LM75=1;
SCL_LM75=1;
F0=0;
delay();
if(SDA_LM75) //假如数据为高 置位非应对标志FO
F0=1; //通用标志位 PSW状况寄存器
SCL_LM75=0; //预备下一改变数据
}

void Ack(void) //发呼应信号
{
SDA_LM75=0;
delay();
SCL_LM75=1;
delay();
SCL_LM75=0;
}

void no_Ack(void) //发非呼应信号
{
SDA_LM75=1;
SCL_LM75=0;
delay();
SCL_LM75=1; //迫使数据传输完毕
delay();
}

void send_byte(unsigned char temp) //发送一字节数据
{
unsigned char i=8;
while(i–)
{
SDA_LM75=(bit)(temp&0x80);
SCL_LM75=1;
delay();
SCL_LM75=0;
temp<<=1;
}
SCL_LM75=0;
delay();
SDA_LM75=1; //开释SDA数据线
}

unsigned char read_byte(void) //读一字节数据
{
unsigned char i=8;
unsigned char temp;
while(i–)
{
temp<<=1;
if(SDA_LM75)
temp++;
SCL_LM75=1;
delay();
SCL_LM75=0;
}
SCL_LM75=0;
delay();
SDA_LM75=1; //开释SDA数据线
return (temp);
}

void Write_chardata(unsigned char addr,unsigned char tempdata)//写装备寄存器
{
start_lm75();
send_byte(WADDR);
Check_Ack();
if(F0)
{
no_Ack();
return;
}
Ack();
send_byte(addr);
Check_Ack();
if(F0)
{
no_Ack();
return;
}
Ack();
send_byte(tempdata);
Check_Ack();
if(F0)
{
no_Ack();
return;
}
Ack();
delay();
stop_lm75();
}

void Write_intdata(unsigned char addr,unsigned int tempdata)//写16位寄存器
{
unsigned char datahigh;
unsigned char datalow;
datahigh=(unsigned char)(tempdata>>8);
datalow=(unsigned char)(tempdata&0x00FF);
start_lm75();
send_byte(WADDR);
Check_Ack();
if(F0)
{
no_Ack();
return;
}
Ack();
send_byte(addr);
Check_Ack();
if(F0)
{
no_Ack();
return;
}
Ack();
send_byte(datahigh);
send_byte(datalow);
Check_Ack();
if(F0)
{
no_Ack();
return;
}
Ack();
delay();
stop_lm75();
}

unsigned char read_chardata(unsigned char addr) //读8位寄存器
{
unsigned char temp;
start_lm75();
send_byte(WADDR);
Check_Ack();
if(F0)
{
no_Ack();
return 0;
}
Ack();
send_byte(addr);
Check_Ack();
if(F0)
{
no_Ack();
return 0;
}
Ack();
send_byte(RADDR);
Check_Ack();
if(F0)
{
no_Ack();
return 0;
}
Ack();
temp=read_byte();
stop_lm75();
return (temp);
}

unsigned int read_intdata(unsigned char addr) //读16位寄存器
{
unsigned char temphigh,templow;
start_lm75();
send_byte(WADDR);
Check_Ack();
if(F0)
{
no_Ack();
return 0;
}
Ack();
send_byte(addr);
Check_Ack();
if(F0)
{
no_Ack();
return 0;
}
Ack();
send_byte(RADDR);
Check_Ack();
if(F0)
{
no_Ack();
return 0;
}
Ack();
temphigh=read_byte();
templow=(read_byte())&0xe0;
stop_lm75();
if(!(temphigh&0x80))
{
dp=0;
return (((temphigh<<8)|templow)>>5);
}
else
{
dp=1;
return (0x800-((temphigh<<8)|templow)>>5);
}
}

void initial() // 初始化LM75A
{
Write_chardata(CONF,0X20); //0S中止形式，温度转化正常形式
Write_intdata(ALARM,0x3300); //100度极限 由高9位有用位组成 BIT15为1表明为负为0表明为正超越100度 触发外部中止0
Write_intdata(DELAY,0X4A80); // 95度后不报警
}

void int0_int() interrupt 0 using 1 // 外部中止0服务函数
{
BP=0;
delay_xms(1000);
BP=1;
delay_xms(1000);
}
void t0_int() interrupt 1 using 1 //定时器0中止服务函数
{
TR0=0;
TH0=0xdc; // 10MS中止初值
TL0=0xff;
TR0=1;
JS++;
if(JS>10) //加到10为100MS
{
JS=0;
tempdata=read_intdata(TEMP); //收集数据
tempdata=(tempdata/8)*10; //转化为温度
}
}

void main() // 进口函数
{
IP=0X01;
TMOD=0X01;
TH0=0xdc; // 10MS中止初值
TL0=0xff;
IT0=0; //外部中止0选用电平触发

ET0=1;
TR0=1; //敞开定时器0中止
EX0=1;
EA=1;
initial();
while(1)
{
if(dp)
Led_Display(tempdata,1);
else
Led_Display(tempdata,0);
}
}