PA2作为时钟线，PA3作为数据线。因为要用作定时输出，所以用到了定时中断程序，请各位帮我看看，程序可能乱了点，主要是看看SHT部分，PWM、定时那些都没有问题的了。不胜感激！！
#include <pic.h>
#include <pic16f81x.h>
#include <math.h>
#include <stdio.h>
char s_write_byte(unsigned char value);
char s_read_byte(unsigned char ack);
void s_transstart(void);
void s_connectionreset(void);
char s_softreset(void);
char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum);
char s_write_statusreg(unsigned char *p_value);
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode);
void calc_sth11(float *p_humidity ,float *p_temperature);
float calc_dewpoint(float h,float t);
void PWM_Initial(void);
void PWM_Display(int PWMOut92, int PWMOut10);
void Timer1_Initial(void);
void interrupt isr(void);
static bit SCK @ (unsigned)&PORTA*8+2;
static bit DATA @ (unsigned)&PORTA*8+3;
//------------------------------------------------------------------------------
// modul-var
//------------------------------------------------------------------------------
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
char PWM92,PWM10;
unsigned int n_Scan=0,pwm=0;
float dew_point;
unsigned char err,chksum;
unsigned int humi_vali=0,temp_vali=0;
float humi_valf,temp_valf;
main()
{
TRISA = 0x00;
TRISB = 0x00;
PORTB = 0x0FF;
PWM_Initial(); // PWM Initial
Timer1_Initial(); // Timer1 Initial
PEIE=1; // Enable Peripheral Interupts
GIE =1; // Enable Global Interrupt
s_connectionreset();
while(1)
{
//
}
}
void PWM_Initial(void)
{
PR2=0x0F9;
CCPR1L=0x7F;
CCP1CON=0x20;
TRISB=0x00;
T2CON=0x05;
CCP1CON|=0x0F;
}
void PWM_Display(int PWMOut92, int PWMOut10)
{
CCPR1L=PWMOut92;
CCP1CON&=0x0CF;
CCP1CON|=PWMOut10;
}
void Timer1_Initial(void)
{
OPTION=0x87; // Falling Edge of INT Pin,WDT Fosc/128
PSA=1; // WDT Fosc/128
T1CON=0x00; // Internal Clock(Fosc/4)
TMR1H=0x0FC;
TMR1L=0x2E; // 1ms
TMR1IF=0; // Clear TIMER1 Interrupt Flag
TMR1IE=1; // Enable TIMER1 Interrupt
TMR1ON=1; // Start Timing
}
void interrupt isr(void)
{
if (TMR1IF==1) // TIMER1 Interrupt Subroutine
{
TMR1IF=0;
TMR1H=0x0FC;
TMR1L=0x2E;
n_Scan+=1;
CLRWDT(); // WDT Clear
if (n_Scan==1000)
{
PORTB=0x0FF;
CLRWDT(); // WDT Clear
}
if (n_Scan==1500)
{
PORTB=0x01;
//pwm=200;
if(pwm==1000)
{
pwm=0;
}
PWM10=(char)(pwm&(0x03));
PWM10=PWM10<<4;
PWM92=pwm>>2;
PWM_Display(PWM92,PWM10);
}
if (n_Scan==2000)
{
PORTB=0x02;
err=0;
err+=s_measure((unsigned char*) &humi_vali,&chksum,HUMI); //measure humidity
//err+=s_measure((unsigned char*) &temp_vali,&chksum,TEMP); //measure temperature
//if(err!=0)
//{s_connectionreset();}
if(err==0)
{
//humi_vali=1500;
//temp_vali=10000;
humi_valf=(float)humi_vali; //converts integer to float
temp_valf=(float)temp_vali; //converts integer to float
calc_sth11(&humi_valf,&temp_valf); //calculate humidity, temperature
pwm=(unsigned int) (humi_valf*10);
}
}
if (n_Scan==7000)
{
PORTB=0x03;
}
if (n_Scan==8000)
{
PORTB=0x04;
}
if (n_Scan==8999) //
{
PORTB=0x0;
n_Scan=0;
}
}
}
//----------------------------------------------------------------------------------
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
TRISA3=1;
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;
}
TRISA3=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
PORTB=0x0;
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 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;
}
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