Crc8_Calc(); Description; Actions; Prototype - Infineon SP37 Function Manual

2.24

CRC8_Calc()

2.24.1

Description

This function calculates the CRC-8 checksum for a memory area in RAM using a fixed polynomial (x
The CRC-8 calculation starts with a defined preload value.
2.24.2

Actions

• Calculate CRC-8
2.24.3

Prototype

unsigned char CRC8_Calc(unsigned char Preload, unsigned char idata * BlockStart, unsigned char
BlockLength)
2.24.4

Inputs

Table 105 CRC8_Calc: Input Parameters
Register / Address
R7
R5
R3
2.24.5

Outputs

Table 106 CRC8_Calc: Output values
Register/ Address
R7
ROM Library Function Guide
Type Name
unsigned char Preload
unsigned char BlockStart
idata*
unsigned char BlockLength
Type Name
unsigned char CRC_Result
Tire Pressure Monitoring Sensor
Description
Preload Value for the CRC Calculation.
According to CCITT a value FF
recommended.
Pointer to first Byte of the Data that is to be used
for calculating checksum
Length in Bytes of Block that is used for
calculation of the checksum, starting with
*BlockStart.
Description
Calculated CRC8 checksum
93
SP37
ROM Library Functions
8 2
+x +x+1).
is
H
Revision 1.0, 2011-12-15