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问 我正在用mega16操纵 DS18B20，但是现在用ICC AVR怎么也写不出可以正常工作的程序。不知哪位大侠有这方面的经验啊？ 答 1: 这是某位网友的作品（可能就是在21ic下载的，我借助它编写了PPC8260上面读DS2520的程序，不敢掠美，特希望作者现一下身）

#include "io2313.h"
#include "macros.h"

#define BOOL unsigned char
#define TRUE 1
#define FALSE 0

#define SET_BIT(x, y) (x|=(1<#define CLR_BIT(x, y) (x&=~(1<#define GET_BIT(x, y) ((x&(1<>y)

#define PULLING_LOW() SET_BIT(DDRD, 0)
#define PULLING_UP() CLR_BIT(DDRD, 0)
#define READ_DQ() GET_BIT(PIND, 0)

#define SKIP_ROM 0xCC
#define READ_RAM 0xBE
#define CONVERT_T 0x44

void ShortDelay(unsigned char tt)
{
asm("_L2: subi R16,1"); // 1t
asm(" nop") // 1t
asm(" brne _L2"); // 2t/1t
asm(" nop"); // 1t
asm(" ret"); // 4t
}

unsigned char W1_Reset()
{
unsigned char c;
PULLING_LOW();
ShortDelay(198); // 500us
ShortDelay(198);
ShortDelay(198);
ShortDelay(198);
ShortDelay(198);
PULLING_UP();
ShortDelay(148); // 75us
c = READ_DQ();
if (c == 0x01)
{
return FALSE;
}
ShortDelay(198); // 300us
ShortDelay(198);
ShortDelay(198);
c = READ_DQ();
if (c == 0x00)
{
return FALSE;
}
return TRUE;
}

unsigned char W1_BitIO(unsigned char b)
{
if (b)
{
PULLING_LOW();
ShortDelay(2); //2us
PULLING_UP();
ShortDelay(18); //10us
b = READ_DQ();
ShortDelay(118); //60us
}
else
{
PULLING_LOW();
ShortDelay(2); //2us
PULLING_LOW();
ShortDelay(18); //10us
b = READ_DQ();
ShortDelay(118); //60us
PULLING_UP();
}
return b;
}

unsigned char W1_SendByte(unsigned char c)
{
unsigned char i = 8;
do
{
c = c>>1|(W1_BitIO(c&1)?0x80:0);
} while(--i);
return c;
}

unsigned char W1_ReadByte()
{
return W1_SendByte(0xFF);
}

unsigned char W1_Command(unsigned c)
{
if (W1_Reset())
{
W1_SendByte(SKIP_ROM);
W1_SendByte(c);
return 1;
}
else
{
return 0;
}
}

int ReadTemperature()
{
union
{
unsigned char c[2];
int i;
} temp;

if (W1_Command(READ_RAM))
{
temp.c[0] = W1_ReadByte();
temp.c[1] = W1_ReadByte();
if (W1_Command(CONVERT_T))
{
;
}
else
{
return -1000;
}
return (int)(temp.i*5/4+1)/2;
}
else
{
return -1000;
}
}
答 2: 谢谢hudaidai了，也感谢原作者。谢谢两位了，我来用用看吧！ 答 3: thank very much 答 4: 有本介绍icc的书上有现成的原程序 答 5: 我的网上有