KMA310 datasheet(45/71 Pages) NXP

45 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

45 / 71

16.4.1 Software example in C++

#include "stdafx.h"

#include "conio.h"

unsigned int calculate_crc(unsigned int crc, unsigned int

data_word)

{

const unsigned int gpoly = 0x107;

// generator polynomial

for (int i = 15; i >= 0; i--)

{

crc <<= 1;

crc |= (int) ((data_word & (1u<<i))>>i);

if (crc & 0x0100) crc ^= gpoly;

}

return crc;

}

int main(void)

{

unsigned int crc;

// data sequence of customer area 1

unsigned int data_word[] = {0x0000, 0x0100, 0x1300, 0x1000,

0x1FFE, 0xFFFF, 0x1200, 0x0000, 0x0099, 0x0F89, 0x80FA,

0x00BE};

// seed value

crc = 0xAA;

printf("Seed value\n0x%02X\n\n", crc);

// number of registers

unsigned int N = sizeof(data_word)/sizeof(unsigned int);

// 8 LSBs are reserved for checksum and must be filled with 0

data_word[N - 1] = data_word[N - 1] & 0xFF00;

// calculate checksum over all addresses

printf("Address\t\tValue\n");

for (unsigned int i = 0; i <= N - 1; i++)

{

printf("0x%02X\t\t0x%04X\n", i, data_word[i]);

crc = calculate_crc(crc, data_word[i]);

}

printf("\nChecksum for customer area 1\n0x%02X", crc);

_getch();

return 0;

}

The checksum of this data sequence is B3h.

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