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#include <stdint.h>

/*

 *  Message size up to 2^8 byte only!

 */

uint8_t crc( uint8_t *data, uint8_t l, uint8_t crc_init )

{

        uint8_t i, j;

        uint8_t crc = 0;

        for ( i = 0; i<l; i++ ) {

                crc ^= ( *data );

                for(j = 0; j<8; j++) {

                        if (crc & 0x80)

                                crc ^= 0x07;

                        crc <<= 1;

                }

        data++;

        }

        return (uint8_t)crc;

}