ds18b20.c

  ds18b20.c如下：

#include "iocc2530.h"#define uint unsigned int
#define uchar unsigned char#define Ds18b20Data P0_6 /* 温度传感器引脚 */#define ON  0x01 /* 读取成功返回0x00，失败返回0x01 */
#define OFF 0x00unsigned char temp; /* 储存温度信息 */void Ds18b20Delay ( uint k ) { /* 时钟频率为32M */uint i, j;for ( i = 0; i < k; i++ )for ( j = 0; j < 2; j++ );
}void Ds18b20InputInitial ( void ) { /* 设置端口为输入 */P0DIR &= 0xbf;
}void Ds18b20OutputInitial ( void ) { /* 设置端口为输出 */P0DIR |= 0x40;
}uchar Ds18b20Initial ( void ) { /* ds18b20初始化，初始化成功返回0x00，失败返回0x01 */uchar Status = 0x00;uint CONT_1 = 0;uchar Flag_1 = ON;Ds18b20OutputInitial();Ds18b20Data = 1;Ds18b20Delay ( 260 );Ds18b20Data = 0;Ds18b20Delay ( 750 );Ds18b20Data = 1;Ds18b20InputInitial();while ( ( Ds18b20Data != 0 ) && ( Flag_1 == ON ) ) { /* 等待ds18b20响应，具有防止超时功能 *//* 等待约60ms左右 */CONT_1++;Ds18b20Delay ( 10 );if ( CONT_1 > 8000 ) {Flag_1 = OFF;}Status = Ds18b20Data;}Ds18b20OutputInitial();Ds18b20Data = 1;Ds18b20Delay ( 100 );return Status;
}void Ds18b20Write ( uchar infor ) {uint i;Ds18b20OutputInitial();for ( i = 0; i < 8; i++ ) {if ( ( infor & 0x01 ) ) {Ds18b20Data = 0;Ds18b20Delay ( 6 );Ds18b20Data = 1;Ds18b20Delay ( 50 );} else {Ds18b20Data = 0;Ds18b20Delay ( 50 );Ds18b20Data = 1;Ds18b20Delay ( 6 );}infor >>= 1;}
}uchar Ds18b20Read ( void ) {uchar Value = 0x00;uint i;Ds18b20OutputInitial();Ds18b20Data = 1;Ds18b20Delay ( 10 );for ( i = 0; i < 8; i++ ) {Value >>= 1;Ds18b20OutputInitial();Ds18b20Data = 0;Ds18b20Delay ( 3 );Ds18b20Data = 1;Ds18b20Delay ( 3 );Ds18b20InputInitial();if ( Ds18b20Data == 1 ) {Value |= 0x80;}Ds18b20Delay ( 15 );}return Value;
}void Temp_test ( void ) { /* 温度读取函数 */uchar V1, V2;Ds18b20Initial();Ds18b20Write ( 0xcc );Ds18b20Write ( 0x44 );Ds18b20Initial();Ds18b20Write ( 0xcc );Ds18b20Write ( 0xbe );V1 = Ds18b20Read();V2 = Ds18b20Read();temp = ( ( V1 >> 4 ) + ( ( V2 & 0x07 ) * 16 ) );
}

ds18b20.h

  ds18b20.h如下：

#ifndef __DS18B20_H__
#define __DS18B20_H__extern unsigned char temp;
extern unsigned char Ds18b20Initial ( void );
extern void Temp_test ( void );
#endif

HAL_Type.h

  HAL_Type.h如下：

#ifndef HAL_Type_H
#define HAL_Type_H#define ushort unsigned short
#define USHORT  ushort#define uchar unsigned char
#define uint8 uchar
#define INT8U uint8
#define u8  uchar#define uint16 unsigned int
#define INT16U uint16
#define u16 uint16#define uint32 unsigned long
#define INT32U uint32
#define u32 uint32
#endif

main.c

  main.c如下：

#include "iocc2530.h"
#include "stdio.h"
#include "ds18b20.h"__near_func int putchar ( int c ) {UTX0IF = 0;U0DBUF = ( char ) c;while ( UTX0IF == 0 );return ( c );
}void InitUART ( void ) {PERCFG = 0x00; /* (外设控制寄存器)USART_0的I/O位置为备用位置0 */P0SEL = 0x0c; /* P0_2和P0_3用作串口(外部设备功能) */P2DIR &= ~0XC0; /* (端口2方向和端口0外设优先级控制)P0优先作为UART0 */U0CSR |= 0x80; /* 设置为UART模式 */U0GCR |= 8; /* 波特率指数值，BAUD_E和BAUD_M决定了UART波特率 */U0BAUD |= 59; /* 波特率设为9600 */UTX0IF = 0; /* UART0的TX中断标志初始设置为0 */
}void Delayms ( int xms ) { /* 延时xms毫秒 */int i, j;for ( i = xms; i > 0; i-- )for ( j = 587; j > 0; j-- );
}void main() {CLKCONCMD &= ~0x40; /* 设置系统时钟源为32MHz晶振 */while ( CLKCONSTA & 0x40 ); /* 等待晶振稳定为32M */CLKCONCMD &= ~0x47; /* 设置系统主时钟频率为32MHz */P0SEL &= 0xbf; /* DS18B20的io口初始化 */InitUART();while ( 1 ) {Temp_test(); /* 温度检测 */printf ( "The temp is %d\r\n", temp );Delayms ( 500 );}
}