mikroc pic18f452 max31865 and max31856 temperature reading function

This is simple but most effective routing for reading temperature read from the max31865 and max31856 chip. Hope this might helps some one.

sbit THERMO_CS at PORTD.B5 ;
sbit THERMO_CS_Direction at TRISD5_Bit;

sbit THERMO_CS2 at PORTA.B3 ;
sbit THERMO_CS2_Direction at TRISA3_Bit;

sbit SoftSpi_SDO at RB3_bit;
sbit SoftSpi_SDI at RD4_bit;
sbit SoftSpi_CLK at RB4_bit;

sbit SoftSpi_SDO_Direction at TRISB3_bit;
sbit SoftSpi_SDI_Direction at TRISD4_bit;
sbit SoftSpi_CLK_Direction at TRISB4_bit;

unsigned int rtd_data;
float resistance, temperature;

char txt1[15],text[15];

char msb_v,lsb_v,tempLTHB,tempLTMB,tempLTLB,ID;

unsigned long tempF, tempC;

float rtemp;

void Initialize_Max31856()
{
THERMO_CS2 = 0;
Soft_SPI_Write(0x80);
Soft_SPI_Write(0xCD); //Auto conversion 9A
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x81);
Soft_SPI_Write(0x03); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x82);
Soft_SPI_Write(0xff); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x83);
Soft_SPI_Write(0x7f); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x84);
Soft_SPI_Write(0xc0); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x85);
Soft_SPI_Write(0x7f); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x86);
Soft_SPI_Write(0xff); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x87);
Soft_SPI_Write(0x80); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x89);
Soft_SPI_Write(0x00); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x8A);
Soft_SPI_Write(0x00); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);
THERMO_CS2 = 0;
Soft_SPI_Write(0x8B);
Soft_SPI_Write(0x00); //Auto conversion
THERMO_CS2 = 1;
Delay_ms(2);

}
void MAX31856_Read()
{

THERMO_CS2 = 0;
Soft_SPI_Write(0x0C);
tempLTHB = Soft_SPI_Read(0); // Register 0Ch
tempLTMB = Soft_SPI_Read(0); // Register 0Dh
tempLTLB = Soft_SPI_Read(0); // Register 0Eh
THERMO_CS2 = 1;

tempC = 0;
tempC = tempLTHB <<8 | tempLTMB;
tempC = tempC << 3 ;
tempLTLB = tempLTLB >> 5 & 0x07;
lo(tempC) = lo(tempC) | tempLTLB ;
tempC = tempC >> 1 ;
rtemp = tempC * 0.015625 ; // 0.015625; 0.0078125
FloatToStr(rtemp, text);

}

void int_max31865()

{

THERMO_CS = 0;
Soft_SPI_Write(0x80);
Soft_SPI_Write(0xE3);
THERMO_CS = 1;

}

unsigned int  max31865_chip_read(unsigned char address)
{
unsigned int value = 0;
THERMO_CS = 0; // Select MAX31865
Soft_SPI_Write(address); // Send register address
value = Soft_SPI_Read(0xFF); // Read register value
value <<= 8;
value |= Soft_SPI_Read(0xFF);
THERMO_CS = 1; // Deselect MAX31865
value >>= 1;
return value;
}

void MAX31865_Read()

{

rtd_data = max31865_chip_read(0x01);
resistance = (float)rtd_data * 390 / 400;

temperature = resistance /32 ;
temperature = temperature – 256;
FloatToStr(temperature, txt1);

}

comments are welcome,