📄 shtxx_sample_code_ok_01.c
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retc=0;
SDA=1; /*置数据线为输入方式*/
for(BitCnt=0;BitCnt<8;BitCnt++)
{
_Nop();
SCL=0; /*置时钟线为低，准备接收数据位*/
_Nop();
_Nop(); /*时钟低电平周期大于4.7μs*/
_Nop();
_Nop();
_Nop();
SCL=1; /*置时钟线为高使数据线上数据有效*/
_Nop();
_Nop();
retc=retc<<1;
if(SDA==1)retc=retc+1; /*读数据位,接收的数据位放入retc中 */
_Nop();
_Nop();
}
SCL=0;
_Nop();
_Nop();
return(retc);
}
void Ack_I2c(bit a) //主控器进行应答信号
{
if(a==0)SDA=0; /*在此发出应答或非应答信号 */
else SDA=1;
_Nop();
_Nop();
_Nop();
SCL=1;
_Nop();
_Nop(); //时钟低电平周期大于4μ
_Nop();
_Nop();
_Nop();
SCL=0; /*清时钟线，钳住I2C总线以便继续接收*/
_Nop();
_Nop();
}
//bit ISendStr(uchar sla,uchar suba,uchar *s,uchar no) //向有子地址器件发送多字节数据函数
//子地址为8位的数据传送
bit ISendStr_8(uchar add,uchar son_add,uchar dat) //向子地址为8位的器件发送多字节数据函数
{
Start_I2c(); /*启动总线*/
SendByte(add); /*发送器件地址*/
if(ack==0)return(0);
SendByte(son_add); /*发送器件子地址*/
if(ack==0)return(0);
SendByte(dat); /*发送数据*/
if(ack==0)return(0);
Stop_I2c(); /*结束总线*/
return(1);
}
//子地址为16位的数据传送
bit ISendStr_16(uchar add,uint son_add,uchar dat) //向子地址为16位的器件发送多字节数据函数
{
Start_I2c(); /*启动总线*/
SendByte(add); /*发送器件地址*/
if(ack==0)return(0);
SendByte(son_add/256); /*发送器件子地址*/
if(ack==0)return(0);
SendByte(son_add%256); /*发送器件子地址*/
if(ack==0)return(0);
SendByte(dat); /*发送数据*/
if(ack==0)return(0);
Stop_I2c(); /*结束总线*/
return(1);
}
//bit IRcvStr(uchar sla,uchar suba,uchar *s,uchar no) //向有子地址器件读取多字节数据函数
//子地址为8位的数据传送
uchar IRcvStr_8(uchar add,uchar son_add) //向子地址为8位的器件读取多字节数据函数
{
uchar i;
Start_I2c(); /*启动总线*/
SendByte(add); /*发送器件地址*/
SendByte(son_add); /*发送器件子地址2*/
Start_I2c();
SendByte(add+0x01);
i=RcvByte();
Ack_I2c(1); /*发送非应位*/
Stop_I2c(); /*结束总线*/
return (i);
}
//子地址为16位的数据传送
uchar IRcvStr_16(uchar add,uint son_add) //向子地址为16位的器件读取多字节数据函数
{
uchar i;
Start_I2c(); /*启动总线*/
SendByte(add); /*发送器件地址*/
SendByte(son_add/256); /*发送器件子地址1*/
SendByte(son_add%256); /*发送器件子地址2*/
Start_I2c();
SendByte(add+0x01);
i=RcvByte();
Ack_I2c(1); /*发送非应位*/
Stop_I2c(); /*结束总线*/
return (i);
}
//----------------------------------------------------------------------------------
char s_write_byte(unsigned char value)
//----------------------------------------------------------------------------------
// writes a byte on the Sensibus and checks the acknowledge
{
unsigned char i,error=0;
for (i=0x80;i>0;i/=2) //shift bit for masking
{ if (i & value) DATA=1; //masking value with i , write to SENSI-BUS
else DATA=0;
SCK=1; //clk for SENSI-BUS
_nop_();_nop_();_nop_(); //pulswith approx. 5 us
SCK=0;
}
DATA=1; //release DATA-line
SCK=1; //clk #9 for ack
error=DATA; //check ack (DATA will be pulled down by SHT11)
SCK=0;
return error; //error=1 in case of no acknowledge
}
//----------------------------------------------------------------------------------
char s_read_byte(unsigned char ack)
//----------------------------------------------------------------------------------
// reads a byte form the Sensibus and gives an acknowledge in case of "ack=1"
{
unsigned char i,val=0;
DATA=1; //release DATA-line
for (i=0x80;i>0;i/=2) //shift bit for masking
{ SCK=1; //clk for SENSI-BUS
if (DATA) val=(val | i); //read bit
SCK=0;
}
DATA=!ack; //in case of "ack==1" pull down DATA-Line
SCK=1; //clk #9 for ack
_nop_();_nop_();_nop_(); //pulswith approx. 5 us
SCK=0;
DATA=1; //release DATA-line
return val;
}
//----------------------------------------------------------------------------------
void s_transstart(void)
//----------------------------------------------------------------------------------
// generates a transmission start
// _____ ________
// DATA: |_______|
// ___ ___
// SCK : ___| |___| |______
{
DATA=1; SCK=0; //Initial state
_nop_();
SCK=1;
_nop_();
DATA=0;
_nop_();
SCK=0;
_nop_();_nop_();_nop_();
SCK=1;
_nop_();
DATA=1;
_nop_();
SCK=0;
}
//----------------------------------------------------------------------------------
void s_connectionreset(void)
//----------------------------------------------------------------------------------
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// _____________________________________________________ ________
// DATA: |_______|
// _ _ _ _ _ _ _ _ _ ___ ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
{
unsigned char i;
DATA=1; SCK=0; //Initial state
for(i=0;i<9;i++) //9 SCK cycles
{ SCK=1;
SCK=0;
}
s_transstart(); //transmission start
}
//----------------------------------------------------------------------------------
char s_softreset(void)
//----------------------------------------------------------------------------------
// resets the sensor by a softreset
{
unsigned char error=0;
s_connectionreset(); //reset communication
error+=s_write_byte(RESET); //send RESET-command to sensor
return error; //error=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum)
//----------------------------------------------------------------------------------
// reads the status register with checksum (8-bit)
{
unsigned char error=0;
s_transstart(); //transmission start
error=s_write_byte(STATUS_REG_R); //send command to sensor
*p_value=s_read_byte(ACK); //read status register (8-bit)
*p_checksum=s_read_byte(noACK); //read checksum (8-bit)
return error; //error=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
char s_write_statusreg(unsigned char *p_value)
//----------------------------------------------------------------------------------
// writes the status register with checksum (8-bit)
{
unsigned char error=0;
s_transstart(); //transmission start
error+=s_write_byte(STATUS_REG_W);//send command to sensor
error+=s_write_byte(*p_value); //send value of status register
return error; //error>=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
//----------------------------------------------------------------------------------
// makes a measurement (humidity/temperature) with checksum
{
unsigned error=0;
unsigned int i;
s_transstart(); //transmission start
switch(mode){ //send command to sensor
case TEMP : error+=s_write_byte(MEASURE_TEMP); break;
case HUMI : error+=s_write_byte(MEASURE_HUMI); break;
default : break;
}
for (i=0;i<65535;i++) if(DATA==0) break; //wait until sensor has finished the measurement
if(DATA) error+=1; // or timeout (~2 sec.) is reached
*(p_value) =s_read_byte(ACK); //read the first byte (MSB)
*(p_value+1)=s_read_byte(ACK); //read the second byte (LSB)
*p_checksum =s_read_byte(noACK); //read checksum
return error;
}
//----------------------------------------------------------------------------------
void init_uart()
//----------------------------------------------------------------------------------
//9600 bps @ 11.059 MHz
{SCON = 0x52;
TMOD = 0x20;
TCON = 0x69;
TH1 = 0xfd;
}
//----------------------------------------------------------------------------------------
void calc_sth11(float *p_humidity ,float *p_temperature)
//----------------------------------------------------------------------------------------
// calculates temperature [癈] and humidity [%RH]
// input : humi [Ticks] (12 bit)
// temp [Ticks] (14 bit)
// output: humi [%RH]
// temp [癈]
{ const float C1=-4.0; // for 12 Bit
const float C2=+0.0405; // for 12 Bit
const float C3=-0.0000028; // for 12 Bit
const float T1=+0.01; // for 14 Bit @ 5V
const float T2=+0.00008; // for 14 Bit @ 5V
float rh=*p_humidity; // rh: Humidity [Ticks] 12 Bit
float t=*p_temperature; // t: Temperature [Ticks] 14 Bit
float rh_lin; // rh_lin: Humidity linear
float rh_true; // rh_true: Temperature compensated humidity
float t_C; // t_C : Temperature [癈]
t_C=t*0.01 - 40; //calc. temperature from ticks to [癈]
rh_lin=C3*rh*rh + C2*rh + C1; //calc. humidity from ticks to [%RH]
rh_true=(t_C-25)*(T1+T2*rh)+rh_lin; //calc. temperature compensated humidity [%RH]
if(rh_true>100)rh_true=100; //cut if the value is outside of
if(rh_true<0.1)rh_true=0.1; //the physical possible range
*p_temperature=t_C; //return temperature [癈]
*p_humidity=rh_true; //return humidity[%RH]
}
//--------------------------------------------------------------------
float calc_dewpoint(float h,float t)
//--------------------------------------------------------------------
// calculates dew point
// input: humidity [%RH], temperature [癈]
// output: dew point [癈]
{ float logEx,dew_point;
logEx=0.66077+7.5*t/(237.3+t)+(log10(h)-2);
dew_point = (logEx - 0.66077)*237.3/(0.66077+7.5-logEx);
return dew_point;
}
//----------------------------------------------------------------------------------
void main()
//----------------------------------------------------------------------------------
// sample program that shows how to use SHT11 functions
// 1. connection reset
// 2. measure humidity [ticks](12 bit) and temperature [ticks](14 bit)
// 3. calculate humidity [%RH] and temperature [癈]
// 4. calculate dew point [癈]
// 5. print temperature, humidity, dew point
{
uchar i = 0;
uchar v = 0;
uchar keydata = 0;
uint dat_ad = 0;
uchar num_ad = 0;
float dat_ad_xian = 0;
value humi_val,temp_val;
float dew_point=0;
unsigned char error,checksum;
unsigned int num_i = 0;
// unsigned int num_i;
lcd_off();
lcd_on();
lcd_ini();
// lcd_wrc(0x80);
/*
for(i=0;i<60;i++)
{
lcd_wrd(0x00+i);
}
*/
delay(100);
lcd_add(1,1);
for(i=0;i<4;i++)
{
lcd_dis_ch(0xb5,0xa1+i);
}
// lcd_dis_ch(0xb5,0xa1);
// lcd_dis_ch(0xb5,0xa1);
// lcd_dis_ch(0xb5,0xa1);
delay(200);
// i=lcd_read_ac();
// i=lcd_read_ac();
i=lcd_read_ac();
// delay(200);
lcd_dis_num(i);
lcd_dis_num(12458);
// I2C
WP = 0;
// write to rom
/*
lcd_add(3,1);
i = ISendStr_16(0xa0,0x0000,19);
lcd_wrd(0x30+i);
*/
/*
lcd_add(4,1);
for(v=0x0000;v<8;v++)
{
i = 0;
while(i == 0)
{
i = ISendStr_16(0xa0,v,3*v);
}
lcd_wrd(0x30+(uchar)i);
}
*/
// read rom set address
/*
lcd_add(3,1);
for(v=0x0000;v<8;v++)
{
i = IRcvStr_16(0xa0,v);
// lcd_wrc(0x88+2*v);
lcd_dis_num(i);
}
*/
// set_time(30,13,21,1,12,3,7); //时钟设置sec, min, hr, dy, dt, mn, yr
//ad中断相关
/*
// IE = IE&0X81; //1000 0001
EA = 0;
EX0 = 1;
// TCON
IT0 = 1;
*/
init_uart();
s_connectionreset();
while(1)
{
error=0;
lcd_add(2,1);
lcd_dis_num(error);
error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); //measure humidity
lcd_add(2,4);
lcd_dis_num(error);
error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); //measure temperature
lcd_add(2,7);
lcd_dis_num(error);
if(error!=0)
{
s_connectionreset(); //in case of an error: connection reset
lcd_add(3,1);
lcd_dis_num(error);
}
else
{
humi_val.f=(float)humi_val.i; //converts integer to float
temp_val.f=(float)temp_val.i; //converts integer to float
calc_sth11(&humi_val.f,&temp_val.f); //calculate humidity, temperature
// dew_point=calc_dewpoint(humi_val.f,temp_val.f); //calculate dew point
// printf("temp:%5.1fC humi:%5.1f%% dew point:%5.1fC\n",temp_val.f,humi_val.f,dew_point);
lcd_add(3,1);
lcd_dis_num((uint)temp_val.f);
lcd_add(3,4);
lcd_dis_num((uint)humi_val.f);
}
//----------wait approx. 0.8s to avoid heating up SHTxx------------------------------
// for (i=0;i<40000;i++); //(be sure that the compiler doesn't eliminate this line!)
ldelay(200);
ldelay(200);
//-----------------------------------------------------------------------------------
// lcd_dis_time(); //时钟显示函数
//测试n次
// i = ad_ce_n();
// ldelay(80);
/*
//ad测试
dat_ad = ad_ce();
lcd_en();
lcd_add(2,1);
lcd_dis_num(dat_ad);
dat_ad_xian = (float)(dat_ad*1.28/2.048);
lcd_dis_num((uint)dat_ad_xian);
ldelay(80);
/*
//ad读
if(sta == 0)
{
P0 = 0XFF;
delay(50);
if(sta == 0)
{
// P0 = 0XFF;
lben = 0;
hben = 1;
ad_en();
_nop_();
i = P0;
ce = 1;
_nop_();
hben = 0;
lben = 1;
ad_en();
_nop_();
v = P0&0x0f;
lcd_en();
lcd_add(2,1);
lcd_dis_num(v);
lcd_dis_num(i);
dat_ad = v*256+i;
lcd_dis_num(dat_ad);
dat_ad_xian = (float)(dat_ad*1.28/2.048);
// dat_ad_xian = (float)(dat_ad/2.048);
lcd_dis_num((uint)dat_ad_xian);
// v = P0&0X30;
// v = v>>4;
// lcd_dis_num(v);
ldelay(80);
}
}
//ad读结束
*/
/* keydata = key_data();
lcd_add(4,7);
switch(keydata)
{
case 0:
{
v = 3;
lcd_dis_num(v);
break;
}
case 1:
{
v = 4;
lcd_dis_num(v);
break;
}
case 2:
{
v = 5;
lcd_dis_num(v);
break;
}
case 3:
{
v = 6;
lcd_dis_num(v);
break;
}
case 4:
{
v = 2;
lcd_dis_num(v);
break;
}
case 5:
{
v = 7;
lcd_dis_num(v);
break;
}
case 6:
{
v = 8;
lcd_dis_num(v);
break;
}
case 7:
{
v = 9;
lcd_dis_num(v);
break;
}
case 8:
{
v = 1;
lcd_dis_num(v);
break;
}
case 9:
{
v = 10;
lcd_dis_num(v);
break;
}
case 10:
{
v = 11;
lcd_dis_num(v);
break;
}
case 11:
{
v = 12;
lcd_dis_num(v);
break;
}
case 12:
{
v = 0;
lcd_dis_num(v);
break;
}
case 13:
{
v = 13;
lcd_dis_num(v);
break;
}
case 14:
{
v = 14;
lcd_dis_num(v);
break;
}
case 15:
{
v = 15;
lcd_dis_num(v);
break;
}
default:
{
v = 16;
lcd_dis_num(v);
break;
}
}
*/
}
}
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