CC2420 CRC verification

This online calculator could do the same CRC calculation as in tinyos:

http://depa.usst.edu.cn/chenjq/www2/SDesign/JavaScript/CRCcalculation.htm


The improved CRC function can be found in tinyos:


/**
 * The following implementation computes the same polynomial.  It should be
 * (much) faster on any processor architecture, as it does not involve
 * loops. Unfortunately, I can not yet give a reference to a derivation.
 *
 * @author Andreas Koepke (porting to tinyos)
 * @author Paul Curtis (pointed out this implementation on the MSP430 yahoo mailing list)
 */

  uint16_t crc_Byte(uint16_t crc, uint8_t b) {
    crc = (uint8_t)(crc >> 8) | (crc << 8);
    crc ^= b;
    crc ^= (uint8_t)(crc & 0xff) >> 4;
    crc ^= crc << 12;
    crc ^= (crc & 0xff) << 5;
  return crc;
}


  uint16_t crc_packet(uint8_t *data, int len) {
    uint16_t crc = 0;

    while (len-- > 0)
      crc = crcByte(crc, *data++);

    return crc;
  }