Omron D6T Series User Manual

17 D6T MEMS Thermal Sensors User’s Manual (A284)
6.5 Example PEC Check Routine
PEC represents CRC-8 error check data. This data is appended to the end of communication
output. The user can use the PEC value to detect communication errors and improve data
reliability.
(Refer to SMBus specifications for more information)
unsigned char calc_crc( unsigned char data )
{
int index;
unsigned char temp;
for(index=0;index<8;index++){
temp = data;
data <<= 1;
if(temp & 0x80) data ^= 0x07;
}
return data;
}
int D6T_checkPEC( char buf , int pPEC );
{
unsigned char crc;
int i;
crc = calc_crc( 0x14 );
crc = calc_crc( 0x4C ^ crc );
crc = calc_crc( 0x15 ^ crc );
for(i=0;i<pPEC;i++){
crc = calc_crc( readbuff[i] ^ crc );
}
return (crc == readbuff[pPEC]);
}
Only the PEC read command is executed when using Stop-Start reads without the use of
RepeatStart.
int D6T_checkPEC( char buf , int pPEC );
{
unsigned char crc;
int i;
crc = calc_crc( 0x15 );
for(i=0;i<pPEC;i++){
crc = calc_crc( readbuff[i] ^ crc );
}
return (crc == readbuff[pPEC]);
}

Omron D6T Series Specifications

General

Brand	Omron
Model	D6T Series
Category	Accessories
Language	English