📄 measure.c
字号:
#include <iom128v.h> //Microcontroller specific library, e.g. port definitions
#include <math.h> //Keil library
#include <stdio.h> //Keil library
#include <macros.h>
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
unsigned char cwendu1,cwendu2;
unsigned int uwendu;
float fwendu;
enum {TEMP,HUMI};
#define noACK 0
#define ACK 1
//adr command r/w
#define STATUS_REG_W 0x06 //000 0011 0
#define STATUS_REG_R 0x07 //000 0011 1
#define MEASURE_TEMP 0x03 //000 0001 1
#define MEASURE_HUMI 0x05 //000 0010 1
#define RESET 0x1e //000 1111 0
#define DATA_SHTxx (1<<1) // PF0
#define DATA_TO_1() (PORTF |= DATA_SHTxx) // PF0='0' //置0
#define DATA_TO_0() (PORTF &= ~DATA_SHTxx) // PF0='float' //置1
#define DATA_status() (PINF & DATA_SHTxx) // read PF0 pin
#define SCK_SHTxx (1<<2) // PF0
#define SCK_TO_0() (PORTF &= ~SCK_SHTxx) // PF0='0'
#define SCK_TO_1() (PORTF |= SCK_SHTxx) // PF0='float' //置0
#define SCK_status() (PINF & SCK_SHTxx) // read PF0 pin //置1
//----------------------------------------------------------------------------------
void shxx_config()
{
//DDRF &= ~DATA_SHTxx ; // 输入模式(上电时为高电平)
DDRF |= 0x02;//(1<<1)//DATA_SHTxx; //配置为输出
PORTF |= 0x02;//(1<<1)//DATA_SHTxx ; // 输出锁存器写0
// DDRF &= ~SCK_SHTxx; // 输入模式(上电时为高电平)
DDRF |=0x04;//(1<<2);// SCK_SHTxx; //配置为输出
PORTF &= 0xfb;//~SCK_SHTxx; // 输出锁存器写0
}
char s_write_byte(unsigned char value)
//----------------------------------------------------------------------------------
// writes a byte on the Sensibus and checks the acknowledge
{
unsigned char i,error=0,merror=0;
DDRF |=0x06;
// for (i=0x80;i>0;i/=2)
/*// while(i>0) //shift bit for masking
{ if (i & value) PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
//_NOP();_NOP();_NOP(); //pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
//i=i/2;
}
*/
PORTF |=0x02;
PORTF &=0xfb;
_NOP();_NOP();_NOP();
i=0x80; //shift bit for masking
{ if (i & value)
PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
_NOP();_NOP();_NOP();
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
_NOP();_NOP();_NOP(); //pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
}
i=0x40;
{ if (i & value)
PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
_NOP();_NOP();_NOP();
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
_NOP();_NOP();_NOP(); //pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
}
i=0x20;
{ if (i & value)
PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
_NOP();_NOP();_NOP();
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
_NOP();_NOP();_NOP(); //pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
}
i=0x10;
{ if (i & value)
PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
_NOP();_NOP();_NOP();
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
_NOP();_NOP();_NOP(); //pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
}
i=0x08;
{ if (i & value)
PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
_NOP();_NOP();_NOP();
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
_NOP();_NOP();_NOP(); //pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
}
i=0x04;
{ if (i & value)
PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
_NOP();_NOP();_NOP();
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
_NOP();_NOP();_NOP(); //pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
}
i=0x02;
{ if (i & value)
PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
_NOP();_NOP();_NOP();
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
_NOP();_NOP();_NOP(); //pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
}
i=0x01;
{ if (i & value)
PORTF |=0x02;//DATA=1; //masking value with i , write to SENSI-BUS
else PORTF &=0xfd;//DATA=0;
PORTF |=0x04;//SCK=1; //clk for SENSI-BUS
_NOP();_NOP();_NOP();
//pulswith approx. 5 us
}
PORTF |=0x02;//DATA=1;
DDRF &=0xfd;
_NOP();_NOP();_NOP();
PORTF &=0xfb;//SCK=0; //release DATA-line
_NOP();_NOP();_NOP(); //clk #9 for ack
merror=PINF&0x02;//error=DATA;
error=merror;
PORTF |=0x04;//SCK=1;
_NOP();_NOP();_NOP(); //check ack (DATA will be pulled down by SHT11)
PORTF &=0xfb;//SCK=0;
DATA_TO_1();
if(error >0)
PORTA |=0x04;
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;
//DDRF |=0x04;
//DDRF &=0xfd;
PORTF |=0x02;//DATA=1;
_NOP();_NOP();_NOP();
//release DATA-line
//for (i=0x80;i>0;i/=2)
i=0x80; //shift bit for masking
{ PORTF |=0x04;//SCK=1;
_NOP(); //clk for SENSI-BUS
if (PINF&0x02) val=(val | i); //read bit
PORTF &=0xfb;//SCK=0;
_NOP();
}
i=0x40;
{ PORTF |=0x04;//SCK=1;
_NOP(); //clk for SENSI-BUS
if (PINF&0x02) val=(val | i); //read bit
PORTF &=0xfb;//SCK=0;
_NOP();
}
i=0x20;
{ PORTF |=0x04;//SCK=1;
_NOP(); //clk for SENSI-BUS
if (PINF&0x02) val=(val | i); //read bit
PORTF &=0xfb;//SCK=0;
_NOP();
}
i=0x10;
{ PORTF |=0x04;//SCK=1;
_NOP(); //clk for SENSI-BUS
if (PINF&0x02) val=(val | i); //read bit
PORTF &=0xfb;//SCK=0;
_NOP();
}
i=0x08;
{ PORTF |=0x04;//SCK=1;
_NOP(); //clk for SENSI-BUS
if (PINF&0x02) val=(val | i); //read bit
PORTF &=0xfb;//SCK=0;
_NOP();
}
i=0x04;
{ PORTF |=0x04;//SCK=1;
_NOP(); //clk for SENSI-BUS
if (PINF&0x02) val=(val | i); //read bit
PORTF &=0xfb;//SCK=0;
_NOP();
}
i=0x02;
{ PORTF |=0x04;//SCK=1;
_NOP(); //clk for SENSI-BUS
if (PINF&0x02) val=(val | i); //read bit
PORTF &=0xfb;//SCK=0;
_NOP();
}
i=0x01;
{ PORTF |=0x04;//SCK=1;
_NOP(); //clk for SENSI-BUS
if (PINF&0x02) val=(val | i); //read bit
PORTF &=0xfb;//SCK=0;
_NOP();
}
DDRF |=0x02;
if(ack==0)
{PORTF |=0x02;
_NOP();
}
else
{PORTF &=0xfd;
_NOP();
}
//DATA=!ack; //in case of "ack==1" pull down DATA-Line
PORTF |=0x04;//SCK=1; //clk #9 for ack
_NOP();_NOP();_NOP();
//pulswith approx. 5 us
PORTF &=0xfb;//SCK=0;
_NOP();_NOP();_NOP();
PORTF |=0x02;//DATA=1;
DDRF &=0xfd;
_NOP(); //release DATA-line
return val;
}
void s_transstart(void)
//----------------------------------------------------------------------------------
// generates a transmission start
// _____ ________
// DATA: |_______|
// ___ ___
// SCK : ___| |___| |______
{
DATA_TO_1();
_NOP();
SCK_TO_0(); //Initial state
_NOP();
SCK_TO_1();
_NOP();
DATA_TO_0();
_NOP();
SCK_TO_0();
//delay_us(5); //pulswith approx. 5 us
_NOP();
_NOP();
_NOP();
_NOP();
_NOP();
SCK_TO_1();
_NOP();
DATA_TO_1();
_NOP();
SCK_TO_0();
_NOP();
}
void s_connectionreset(void)
//----------------------------------------------------------------------------------
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// _____________________________________________________ ________
// DATA: |_______|
// _ _ _ _ _ _ _ _ _ ___ ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
{
unsigned char i;
DATA_TO_1();
_NOP();
SCK_TO_0(); //Initial state
_NOP();
for(i=0;i<9;i++) //9 SCK cycles
{ SCK_TO_1();
_NOP();
SCK_TO_0();
_NOP();
}
s_transstart(); //transmission start
}
char s_measure(unsigned char *p_checksum, unsigned char mode)
//----------------------------------------------------------------------------------
// makes a measurement (humidity/temperature) with checksum
{
unsigned error=0;
unsigned int i,j,k;
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;
}
PORTF |=0x02;
DDRF &=0xfd;
for(k=0;k<65535u;k++)
{
for (i=0;i<65535u;i++)
{
j=PINF&0x02;//DATA_status();//PORTF&0x02;
if(j==0) break;
}
if(j==0)
break;
}
if(j) error+=1; // or timeout (~2 sec.) is reached
cwendu1=s_read_byte(ACK); //read the first byte (MSB)
cwendu2=s_read_byte(ACK); //read the second byte (LSB)
uwendu =cwendu1*256+cwendu2;
*p_checksum =s_read_byte(noACK);
if(error>0)
PORTA |=0x02; //read checksum
return error;
}
void calc_sth11(float *p_temperature)
//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]
{
//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;//-327.68; //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
{ //value temp_val;//humi_val;
//unsigned int temp_new;
//float dew_point;
unsigned char error,checksum;
unsigned int i;
DDRA |=0x07;
//delay();
//delay();
//newdelay();
//init_uart();
//while(1)
//PORTA &=0xfb;
while(1)
{
shxx_config();
s_connectionreset();
error=0;
//error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); //measure humidity
//error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); //measure temperature
error+=s_measure(&checksum,TEMP);
if(error!=0)
s_connectionreset();
else
{
//for (i=0;i<60000;i++);
//PORTA &=0xfb; //in case of an error: connection reset
//PORTA &=0xfb;
//PORTA =0x02;
//humi_val.f=(float)humi_val.i; //converts integer to float
fwendu=(float)uwendu;
calc_sth11(&fwendu); //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);
}
if(fwendu>30.0)
PORTA |=0x01;
else
PORTA &=0xfe;
//----------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!)
//-----------------------------------------------------------------------------------
}
}⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -