12864显示温度曲线

//12864并行连接，PSB接地正极

#include

#include

#include

#define uint unsigned int

#define uchar unsigned char

sbit rs=P2^0; /*数据\指令选择*/

sbit rw=P2^1; /*读\写选择*/

sbit e=P2^2; /*读\写使能*/

sbit ds=P3^2; //18B20信号脚

uint temp;

float ftemp;

uchar code table[]="0123456789.d";

void writecom(uchar com);

void writedat(uchar dat);

void initinal(void);

//12MHZ晶振延时50微秒

void delay50us(uint t)

{

uchar j;

for(;t>0;t--)

for(j=19;j>0;j--);

}

void dsreset() // ds18b20初始化函数

{

uint i;

ds=0; //拉低总线开始复位

i=103;

while(i>0)i--;

ds=1;//释放总线

i=4;

while(i>0)i--;

// 省去了等待芯片返回应答的过程。。。。。。

}

bit readbit(void) //ds18b20读取一个二进制位，参照时序图{

uint i;

bit dat;

ds=0;i++;

ds=1;i++,i++;

dat=ds;

i=8;while(i>0)i--;

return(dat);

}

uchar tempread(void) //ds18b20读取一个字节的数据{

uchar i,j,dat;

dat=0;

for(i=0;i<8;i++)

{

j=readbit();

dat=(j<<7)|(dat>>1); //

}

return(dat);

}

void tempwrite(uchar dat) //ds18b20写入字节数据

{

uint i;uchar j;

bit testb;

for(j=1;j<=8;j++)

{

testb=dat&0x01;

dat=dat>>1;

if(testb==1) // 写1

{

ds=0; // 拉低总线以开始一个写时序

i++;i++;

ds=1; // 释放总线

i=8;while(i>0)i--;

}

else // 写0

{

ds=0;

i=8;while(i>0)i--;

ds=1;

i++;i++;

}

}

}

void tempchang(void) //温度转换

{

dsreset();

delay50us(20);

tempwrite(0xcc); //

tempwrite(0x44); //

}

uint gettemp() // 获取温度

{

uchar a,b;

dsreset();

delay50us(2000); //延时100毫秒消除恐怖85度tempwrite(0xcc); //

tempwrite(0xbe); //

a=tempread(); //

b=tempread(); //

temp=b;

temp<<=8; //////

temp=temp|a;

ftemp=temp*0.0625; //

temp=ftemp*10+0.5; //

ftemp=ftemp+0.05; //

return temp; //

}

/*------------------检查忙位-----------------------------*/

void chkbusy()

{

rs=0;

rw=1;

e=1;

P0=0xff ;

while((P0&0x80)==0x80);

e=0;

}

/*************读数据************/

uchar read()

{

uchar shuju;

chkbusy();

P0=0xff;

rs=1;

rw=1;

e=0;

delay50us(1);

e=1;

shuju=P0;

// delay(5);

e=0;

return(shuju);

}

//增加画点子程序

void DrawPoint(uchar X,uchar Y,uchar Color)

{

uchar Row,Tier,Tier_bit ;

uchar ReadOldH,ReadOldL ;

writecom(0x34);

writecom(0x36);

Tier=X>>4 ;

Tier_bit=X&0x0f ;

if(Y<32)

{

Row=Y ;

}

else

{

Row=Y-32 ;

Tier+=8 ;

}

writecom(Row+0x80);

writecom(Tier+0x80);

read();

ReadOldH=read();

ReadOldL=read();

writecom(Row+0x80);

writecom(Tier+0x80);

if(Tier_bit<8)

{

switch(Color)

{

case 0 :

ReadOldH&=(~(0x01<<(7-Tier_bit)));

break ;

case 1 :

ReadOldH|=(0x01<<(7-Tier_bit));

break ;

case 2 :

ReadOldH^=(0x01<<(7-Tier_bit));

break ;

default :

break ;

}

writedat(ReadOldH);

writedat(ReadOldL);

}

else

{

switch(Color)

{

case 0 :

ReadOldL&=(~(0x01<<(15-Tier_bit)));

break ;

case 1 :

ReadOldL|=(0x01<<(15-Tier_bit));

break ;

case 2 :

ReadOldL^=(0x01<<(15-Tier_bit));

break ;

default :

break ;

}

writedat(ReadOldH);

writedat(ReadOldL);

}

writecom(0x30);

}

//写命令

void writecom(uchar com)

{

chkbusy();

rw=0;

rs=0;

delay50us(1);

P0=com;

e=1;

delay50us(10);

e=0;

delay50us(10);

}

//写数据

void writedat(uchar dat)

{

chkbusy();

rw=0;

rs=1;

delay50us(1);

P0=dat;

e=1;

delay50us(10);

e=0;

delay50us(10);

}

//初始化

void initinal(void)

{

delay50us(2);

writecom(0x30);

delay50us(4);

writecom(0x30);

delay50us(4);

writecom(0x0e);

delay50us(4);

writecom(0x01);

delay50us(240);

writecom(0x06);

delay50us(10);

}

void clrscreen()

{

writecom(0x01);

delay50us(10);

}

//------------------清整个GDRAM空间---------------------------- void clrgdram()

{

unsigned char x,y ;

for(y=0;y<64;y++)

for(x=0;x<16;x++)

{

writecom(0x34);

writecom(y+0x80);

//行地址

writecom(x+0x80);

//列地址

writecom(0x30);

writedat(0x00);

writedat(0x00);

}

}

//------------------------------------------------------------ //主函数

void main()

{

uchar i,j,e,colour=1;

uint a ;

rw=0;

initinal();

clrgdram();

delay50us(2);

// clrscreen();

writecom(0x34);

while(1)

{

uint a,b,c,d;

DrawPoint(17,6,colour);

DrawPoint(17,22,colour);

DrawPoint(17,38,colour);

DrawPoint(17,54,colour);

for(j=16;j<124;j++)

{

DrawPoint(16,j-16,colour);

DrawPoint(j,63,colour);

DrawPoint(i,e,colour);

writecom(0x80);

writedat(table[6]);

writedat(table[7]);

writecom(0x90);

writedat(table[5]);

writedat(table[1]);

writecom(0x88);

writedat(table[3]);

writedat(table[5]);

writecom(0x98);

writedat(table[1]);

writedat(table[9]);

}

for(i=16;i<124;i++)

{

tempchang();

a=gettemp();

e=73-a/10;

DrawPoint(i,e,colour);

delay50us(10000);

b=a/100;

c=a%100/10;

d=a%100%10;

writecom(0x83);

writedat(table[b]);

delay50us(1);

writedat(table[c]);

delay50us(1);

writedat(table[10]);

delay50us(1);

writedat(table[d]);

delay50us(1);

writedat(table[11]);

delay50us(4);

writecom(0x83);

}

clrgdram();

// writecom(0x36);

// delay50us(5);

// clrgdram();

// clrscreen();

// tempchang();

// a=gettemp();

}

}