Omron D6T Series - PEC Error Checking Routine; CRC Calculation Function; PEC Check for Specific I2 C Reads

D6T MEMS Thermal Sensors User’s Manual (A284) 16
(Added sections for the 8-channel D6T-8L-09)
int D6T_getvalue()
{
I2C_start();
I2C_send( 0x14 , 0x02 , 0x00 , 0x01 , 0xEE );
I2C_stop();
I2C_start();
I2c_send ( 0x14 , 0x05 , 0x90 , 0x3A , 0xB8 ) ;
I2C_stop();
I2C_start();
I2c_send ( 0x14 , 0x03 , 0x00 , 0x03 , 0x8B ) ;
I2C_stop();
I2C_start();
I2c_send ( 0x14 , 0x03 , 0x00 , 0x07 , 0x97 ) ;
I2C_stop();
I2C_start();
I2c_send ( 0x14 , 0x02 , 0x00 , 0x00 , 0xE9 ) ;
I2C_stop();
I2C_start();
I2C_send( 0x14 , 0x02 );
I2C_repeatstart();
I2C_send( 0x15 );
I2C_get( 0x15 , readbuff , 2 ); // Expected value of 2 byte read is 0x00 and 0x00.
I2C_stop();
I2C_start();
I2c_send( 0x14 , 0x05 );
I2C_repeatstart();
I2C_send( 0x15 );
I2C_get( 0x15 , readbuff , 2 ); // Expected value of 2 byte read is 0x90 and 0x3A.
I2C_stop();
I2C_start();
I2C_send( 0x14 , 0x03 );
I2C_repeatstart();
I2C_send( 0x15 );
I2C_get( 0x15 , readbuff , 2); // Expected value of 2 byte read is 0x00 and 0x07.
I2C_stop();
I2C_start();
I2C_send1( 0x14 , 0x4C ); // 14h = { 0Ah(Addr7) : Write(0b) }
I2C_repeatstart();
I2C_getx( 0x15 , readbuff , 19 ); // 15h = { 0Ah(Addr7):Read },19 = 2*(1+8)+1
I2C_stop();
If(!D6T_checkPEC(readbuff,18)){
return - 1; // error
}
tPTAT = 256*readbuff[1] + readbuff[0];
tP[0] = 256*readbuff[3] + readbuff[2];
tP[1] = 256*readbuff[5] + readbuff[4];
tP[2] = 256*readbuff[7] + readbuff[6];
tP[3] = 256*readbuff[9] + readbuff[8];
tP[4] = 256*readbuff[11] + readbuff[10];
tP[5] = 256*readbuff[13] + readbuff[12];
tP[6] = 256*readbuff[15] + readbuff[14];
tP[7] = 256*readbuff[17] + readbuff[16];
tPEC = readbuff[18];
return 1;
}
* With this example temperature program, only one set of measurements are retrieved.
* In the case of standard specifications, this sensor updates temperature data every 250 ms
or less. This operation is independent of any communication processing. Temperature
update timing cannot be controlled externally.