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(root)//Designs/Measuring_instruments/AWS01B/SW/PIC16F887/MPL3115.c @ 4137

Rev 2980

//Knihovna pro senzor MPL3115
//(c) Jan Chroust 2013

void mpl3115_setA (void) //nastavení pro výšku
 {

     
   i2c_start(); //STANDBY mode
   I2C_Write(MPL3115_ADDR_W);
   I2C_write(0x26);  
   I2C_write(0xB8);
   i2c_stop();
   
   i2c_start(); //PT_DATA_CFG set
   I2C_Write(MPL3115_ADDR_W);
   I2C_write(0x13);  
   I2C_write(0x07); //hodnota
   i2c_stop();
   
   i2c_start();   //ACTIVE mode
   I2C_Write(MPL3115_ADDR_W);
   I2C_write(0x26);  
   I2C_write(0xB9);
   i2c_stop();
  }
  
void mpl3115_setP (void) //nastavení pro tlak
 {

     
   i2c_start(); //STANDBY mode
   I2C_Write(MPL3115_ADDR_W);
   I2C_write(0x26);  
   I2C_write(0xB8);
   i2c_stop();
   
   i2c_start(); //PT_DATA_CFG set
   I2C_Write(MPL3115_ADDR_W);
   I2C_write(0x13);  
   I2C_write(0x07); //hodnota
   i2c_stop();
   
   i2c_start();   //ACTIVE mode
   I2C_Write(MPL3115_ADDR_W);
   I2C_write(0x26);  
   I2C_write(0x39);
   i2c_stop();
  }


byte mpl3115_read (byte reg)
 {
   byte i;
     
   i2c_start(); 
   I2C_Write(MPL3115_ADDR_W);
   I2C_write(reg);  
   i2c_start(); 
   I2C_Write(MPL3115_ADDR_R);
   i=i2c_read(0);
   i2c_stop();
   
   return i;
  }


float mpl3115_T (void) //teplota ve stupnich
{
int m;
float l, t;
 
   m= mpl3115_read (0x04);
   l= (float)(mpl3115_read(0x05)>>4)/16.0;
   t = (float)(M + L); 
 return t;
}

float mpl3115_A (void) //vyska v m
{

int16 m;
unsigned int8 c;
float l, a;
 
m= mpl3115_read (0x01);
c= mpl3115_read (0x02);  
l= (float)(mpl3115_read(0x03)>>4)/16.0;
a = (float)((m << 8)|c) + l;
 return a;
}


float mpl3115_P (void) //tlak v Pa
{
unsigned int32  m;
unsigned int16 c;
unsigned int8 l,l2;
float p, l1;
 
m= mpl3115_read (0x01);
c= mpl3115_read (0x02);  
l=mpl3115_read(0x03);
l2=l<<2;
l1= (float)(l>>6)/4.0;
p = (float)((m << 10)|(c<<2)|(l>>6)) + l1;

 return p;
}