SHT11溫濕度傳感器AVR單片機程序

#include"shtxx.h"

voidshtxx_init(void)
{
shtxx_temp=shtxx_humi=0;
SHTXX_SCK_LOW();
SHTXX_DAT_1();

shtxx_reconnect();
}

voidshtxx_reconnect(void)
{
SHTXX_DAT_1();
SHTXX_SCK_LOW();
for(uint8i=0;i<9;i++)
{
SHTXX_SCK_HIGH();SHTXX_SCK_LOW();
}
SHTXX_START();
}

uint8shtxx_SOFtrst(void)
{
uint8error=0;
shtxx_reconnect();
error+=shtxx_write_byte(SHTXX_SOFT_RST);
returnerror;
}

//寫命令函數(shù)
//參數(shù)：命令類型
//返回：0成功，1失敗
uint8shtxx_write_byte(uint8cmd)
{
uint8ack;
for(uint8i=8;i>0;i--)
{
if(BITCHK(cmd,(i-1)))//trans’1’
{
SHTXX_DAT_1();
SHTXX_SCK_HIGH();SHTXX_SCK_LOW();
}
else//trans’0’
{
SHTXX_DAT_0();
SHTXX_SCK_HIGH();SHTXX_SCK_LOW();
}
}
//SHTxx會以下述方式表示已正確地接收到指令：
//在第8個SCK時鐘的下降沿之后，將DATA下拉為低電平（ACK位）。
//在第9個SCK時鐘的下降沿之后，釋放DATA（恢復(fù)高電平）。
BITCLR(SHTXX_DAT_DDR,SHTXX_DAT_BIT);
SHTXX_SCK_HIGH();
ack=BITCHK(SHTXX_DAT_PIN,SHTXX_DAT_BIT);
SHTXX_SCK_LOW();
returnack;
}

uint8shtxx_read_byte(uint8dat_crc)
{
uint8dat8=0;
for(uint8i=8;i>0;i--)
{
BITCLR(SHTXX_DAT_DDR,SHTXX_DAT_BIT);
c4680504cSHTXX_SCK_HIGH();
if(BITCHK(SHTXX_DAT_PIN,SHTXX_DAT_BIT))
BITSET(dat8,(i-1));
SHTXX_SCK_LOW();
}

if(dat_crc)
{
SHTXX_DAT_0();
SHTXX_SCK_HIGH();SHTXX_SCK_LOW();
}
else
{
SHTXX_DAT_1();
SHTXX_SCK_HIGH();SHTXX_SCK_LOW();
}
SHTXX_DAT_1();

returndat8;
}

int8shtxx_measure(uint8mode)
{
uint8error=0;

SHTXX_START();
switch(mode)
{
caseSHTXX_MODE_TEMP:
error=shtxx_write_byte(SHTXX_CMD_TEMPTURE);
for(uint16i=0;i<65535;i++)
{
_delay_us(5);
BITCLR(SHTXX_DAT_DDR,SHTXX_DAT_BIT);
if(!(BITCHK(SHTXX_DAT_PIN,SHTXX_DAT_BIT)))break;
}
BITCLR(SHTXX_DAT_DDR,SHTXX_DAT_BIT);
if(BITCHK(SHTXX_DAT_PIN,SHTXX_DAT_BIT))error+=1;

shtxx_temp=shtxx_read_byte(1);
shtxx_temp=(shtxx_temp<<8)+shtxx_read_byte(1);
shtxx_crc=shtxx_read_byte(0);
break;
caseSHTXX_MODE_HUMI:
error=shtxx_write_byte(SHTXX_CMD_HUMIDITY);
for(uint16i=0;i<65535;i++)
{
_delay_us(5);
BITCLR(SHTXX_DAT_DDR,SHTXX_DAT_BIT);
if(!(BITCHK(SHTXX_DAT_PIN,SHTXX_DAT_BIT)))break;
}
BITCLR(SHTXX_DAT_DDR,SHTXX_DAT_BIT);
if(BITCHK(SHTXX_DAT_PIN,SHTXX_DAT_BIT))error+=1;
shtxx_humi=shtxx_read_byte(1);
shtxx_humi=(shtxx_humi<<8)+shtxx_read_byte(1);
shtxx_crc=shtxx_read_byte(0);
break;
default:
break;
}

returnerror;
}

voidshtxx_calc(void)
{
uint32rh_line=0;
//所有濕度常量放大10000000
constuint32C1=40000000;
constuint32C2=405000;
constuint32C3=28;
constuint32T1=100000;
constuint32T2=8000;

//溫度常量放大100
t_c=shtxx_temp-4000;//結(jié)果除以100

rh_line=C2*shtxx_humi-C3*shtxx_humi*shtxx_humi-C1;
rh_true=(t_c/100-25)*(T1+T2*shtxx_humi)+rh_line;

if(rh_true>1000000000)rh_true=1000000000;//cutifthevalueisoutsideof
if(rh_true<1000000)rh_true=1000000;//thephysICalpossiblerange
}

voidhex_bcd(uint32hex32)
{
MEMSet(bcd32,’