51+HD7279+ADS1110+PT100的测温系统(程序)(4)

51+HD7279+ADS1110+PT100的测温系统,通过与标准温度计对比拟合,精度能达到0.5度

uchar read7279(uchar command)

{

cs = 0;

send_byte(command);

return(receive_byte());

cs = 1;

}

void send_byte( uchar out_byte)

{

uchar i;

cs=0;

long_delay();

for (i=0;i<8;i++)

{

if (out_byte&0x80)

{

dat=1;

}

else

{

dat=0;

}

clk=1;

short_delay();

clk=0;

short_delay();

out_byte=out_byte*2;

}

dat=0;

}

uchar receive_byte(void)

{

uchar i, in_byte;

dat=1; // set to input mode

long_delay();

for (i=0;i<8;i++)

{

clk=1;

short_delay();

in_byte=in_byte*2;

if (dat)

{