#include "main.h"

void SHT25_soft_reset()
{
  i2c_start();     // Start condition
  i2c_write(0x80); // Device address
  i2c_write(0xFE);    // Device command
  i2c_stop();      // Stop condition
}

unsigned int8 SHT25_setup()
{
unsigned int8 reg;

  i2c_start();     // Start condition
  i2c_write(0x80); // Device address
  i2c_write(0xE7);    // Device command

  i2c_start();     // Start condition
  i2c_write(0x81); // Device address
  reg=i2c_read(0);    // Device command
  i2c_stop();      // Stop condition
  
   return (reg);
}

float SHT25_get_temp()
{
unsigned int8 MSB, LSB, Check;
unsigned int16 data;

   i2c_start();
   I2C_Write(0x80);
   I2C_write(0xE3);
   i2c_stop();
  
   delay_ms(100);
   
   i2c_start();
   I2C_Write(0x81);
   MSB=i2c_read(1);
   LSB=i2c_read(1);
   Check=i2c_read(0);
   i2c_stop();
      
   LSB = LSB >> 2; // trow out status bits

   data = (((unsigned int16) MSB << 8) + (LSB << 4));
   return(-46.85 + 175.72*((float)data/0xFFFF));
}

float SHT25_get_hum()
{
unsigned int8 MSB, LSB, Check;
unsigned int16 data;

   i2c_start();   //RH
   I2C_Write(0x80);
   I2C_write(0xE5);
//   i2c_stop();

   delay_ms(100);

   i2c_start();
   I2C_Write(0x81);
   MSB=i2c_read(1);
   LSB=i2c_read(1);
   Check=i2c_read(0);
   i2c_stop(); 

//   printf("%X %X  %X\r\n",MSB, LSB, Check);   

   LSB = LSB >> 2; // trow out status bits

   data = (((unsigned int16) MSB << 8) + (LSB << 4) );
   return( -6.0 + 125.0*((float)data/0xFFFF));
}      


void main()
{

   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_CLOCK_DIV_2);
   setup_spi(SPI_SS_DISABLED);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_ccp1(CCP_OFF);
   setup_comparator(NC_NC_NC_NC);

   void SHT25_soft_reset();
   printf("SHT25 humidity and temperature sensor example \r\n",);
   delay_ms (500);

  while(TRUE)
  { 
      printf("setup: %X \r\n",SHT25_setup());      
      delay_ms (500);
      printf("Temp: %f \r\n",SHT25_get_temp());      
      delay_ms (500);
      printf("Hum: %f \r\n",SHT25_get_hum());      
      delay_ms (1000);
  } 
}