ds18d20_test.c

ds1302和ds18b20驱动程序.完全是可以用的程序.

#include	<reg52.h>
#include	<intrins.h>

#ifndef uchar
#define uchar unsigned char
#endif
#ifndef uint
#define uint  unsigned int
#endif
#define ds1302_set0(x) x=0
#define ds1302_set1(x) x=1
sbit ds1302_rst=P3^7;
sbit ds1302_sclk=P2^0;
sbit ds1302_io=P2^1;
void  ds1302_initial();
void  ds1302_senddata(uchar dsend);
uchar  ds1302_receivedata(void);
/*******************寄存器********************/
unsigned char  Ds1302Reg[7]={0};   //ds1302内部日期寄存器 （00-06)
unsigned char  Date[14]={0};
/*********************************************/


sbit dp = P0 ^4;		//定义温度器件的数据脚位
bit	 temp_flag;
unsigned int  idata	temp_data;
unsigned char idata temp_buff[9];
unsigned char idata id_buff[8];
unsigned char *p_tempdata;
unsigned char code crc_table[256] ={
    0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
	157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
	35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
	190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
	70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
	219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
	101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
	248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
	140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
	17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
	175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
	50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
	202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
	87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
	233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
	116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53};
void delay(unsigned char us)
{
	while (us--);
}
void init_18b20(void)
{
	dp =1;
	_nop_();
	dp =0;
	delay(80);			//delay 530us
	dp =1;
	delay(14);			//delay	100us
	if (dp == 0)
		temp_flag =1;	//detec 18b20 success!
	else
		temp_flag =0;	//detec 18b20 fail!
	delay(20);
	dp	=1;
}
void write_temp(unsigned char wr)
{						//写入单字节数
	unsigned char i;
	for (i =0;i<8;i++)
		{
			dp =0;
			_nop_();
			dp =wr&0x01;
			delay(5);	//delya 45us
			dp =1;
			wr >>=1;
		}
}
unsigned char read_byte(void)
{						//读取单字节数
	unsigned char i,u=0;
	for (i =0;i<8;i++)
		{
			dp =0;
			u >>=1;
			dp =1;
			if (dp==1)
				u |=0x80;
			delay(4);
		}
	return(u);
}
void read_bytes(unsigned char j)
{
	unsigned char i;
	for (i =0;i<j;i++)
		{
			*p_tempdata=read_byte();
			p_tempdata++;
		}
}
unsigned char crc_conter(unsigned char j)
{
	unsigned char i,crc_data =0;
	for (i =0;i <j;i++)
		{
			crc_data =crc_table[crc_data ^ temp_buff[i]];
		}
    return(crc_data);
}
void get_temp(void)
{
	read_bytes(9);
	if (crc_conter(9)==0)
		{
			temp_data =(temp_buff[1]*0x100)+temp_buff[0];
			temp_data *=0.625;
		}
}
void temp_config(void)
{						//重新配置报警限定值和分辨率
	init_18b20();
	write_temp(0xcc);	//skip rom
	write_temp(0x4e);	//write scratchpad
	write_temp(0x19);	//上限	
	write_temp(0x1a);	//下限
	write_temp(0x7f);	//set 11 bit (0.125)
	init_18b20();
	write_temp(0xcc);	//skip rom
	write_temp(0x48);	//保存设定值
	init_18b20();
	write_temp(0xcc);	//skip rom
	write_temp(0xb8);	//回调设定值
}
void read_tempID(void)
{
	init_18b20();
	write_temp(0x33);
	read_bytes(8);
}


void ds1302_senddata(uchar dsend)
{ 
 uchar i;
 for(i=0;i<8;i++)
 {    
  ds1302_io=(bit)(dsend&0x01);
  delay(20);
  ds1302_set1(ds1302_sclk);
  dsend=dsend>>1; 
  delay(20);
  ds1302_set0(ds1302_sclk);  
  delay(20);
 }
}
uchar ds1302_receivedata(void)
{
 uchar i,dat=0;
 for(i=0;i<8;i++)
 {
  dat=dat>>1;  
  if(ds1302_io) dat=dat|0x80;
  else   dat=dat&0x7f;
  delay(20);
  ds1302_set1(ds1302_sclk);
  delay(20);
  ds1302_set0(ds1302_sclk); 
  delay(20);
 }
 return(dat);
}

void Ds1302Write(char data1,char data2)
{
  ds1302_set0(ds1302_rst);
 _nop_();
 _nop_();
 delay(20);
 ds1302_set0(ds1302_sclk);
 _nop_();
 _nop_();
 delay(20);
 ds1302_set1(ds1302_rst);
 _nop_();
 _nop_();
 delay(20);
 ds1302_senddata(data1);
 ds1302_senddata(data2);
 _nop_();
 _nop_();
 delay(20);
 ds1302_set1(ds1302_sclk);
 _nop_();
 _nop_();
 delay(20);
 ds1302_set0(ds1302_rst);
}
char Ds1302Read(char Addr)
{
 unsigned char DataReturn;
 ds1302_set0(ds1302_rst);
 _nop_();
 _nop_();
 delay(20);
 ds1302_set0(ds1302_sclk);
 _nop_();
 _nop_();
 delay(20);
 ds1302_set1(ds1302_rst);
 _nop_();
 _nop_();
 delay(20);
 ds1302_senddata(Addr);
 DataReturn=ds1302_receivedata();
 ds1302_set1(ds1302_sclk);
 _nop_();
 _nop_();
 delay(20);
 ds1302_set0(ds1302_rst);
 return(DataReturn);
}
void Ds1302ReadAll()
{
 unsigned char i;
 for(i=0;i<7;i++)
 {
  Ds1302Reg[i]=Ds1302Read(0x81|((i<<1)&0xfe));
  if (i==0)
  	{
		if (Ds1302Reg[i]&0x80)
			{
				Ds1302Write(0x8e,0x00);
				Ds1302Write(0x80,0x00);
				Ds1302Write(0x8e,0x80);
			}
	}
 }
}
void Ds1302DataConver()
{
 char Counter=0; 
 Ds1302ReadAll();
 //秒 分 时
 Date[5]=Ds1302Reg[0]%0x10;
 Date[4]=((Ds1302Reg[0]>>4)&0x07);
 Date[3]=Ds1302Reg[1]%0x10;
 Date[2]=(Ds1302Reg[1]>>4);
 Date[1]=Ds1302Reg[2]%0x10;
 Date[0]=((Ds1302Reg[2]>>4)&0x01);
 //日 月
 Date[9]=Ds1302Reg[3]%0x10;
 Date[8]=((Ds1302Reg[3]>>4)&0x03);
 Date[7]=Ds1302Reg[4]%0x10;
 Date[6]=((Ds1302Reg[4]>>4)&0x01);
 //星期
 Date[10]=Ds1302Reg[5];
 //年 基数 2000
 Date[11]=Ds1302Reg[6]%0x10;
 Date[12]=((Ds1302Reg[6]>>4)&0x0f);
 for(Counter=0;Counter<13;Counter++)
 Date[Counter]+='0';
}

void ds1302_initial()
{
 ds1302_set0(ds1302_sclk);
 ds1302_set0(ds1302_rst);
 ds1302_set0(ds1302_io);
 Ds1302Write(0x8e,0x00);
 Ds1302Write(0x80,0x00);
 Ds1302Write(0x82,0x55);
 Ds1302Write(0x84,0x23);
 Ds1302Write(0x86,0x31);
 Ds1302Write(0x88,0x12);
 Ds1302Write(0x8a,0x03);
 Ds1302Write(0x8c,0x08);
 Ds1302Write(0x90,0xa9);
 Ds1302Write(0x8e,0x80);
}

void delay_500(void)
{
	unsigned int a,i;
	while (a--);
	while (i);
}
void main(void)
{
	p_tempdata	=id_buff;
	read_tempID();
	temp_config();
	ds1302_initial();
	for (;;)
		{
			init_18b20();
			write_temp(0xcc);	//skip rom
			write_temp(0x44);
			init_18b20();
			write_temp(0xcc);
			write_temp(0xbe);
			p_tempdata	=temp_buff;
			get_temp();
//			delay_500();
			Ds1302DataConver();
			delay_500();
		}
}