Method crc8

Arduino/libraries/OneWire/OneWire.cpp:525–533

Compute a Dallas Semiconductor 8 bit CRC. These show up in the ROM and the registers. (note: this might better be done without to table, it would probably be smaller and certainly fast enough compared to all those delayMicrosecond() calls. But I got confused, so I use this table from the examples.)

// confused, so I use this table from the examples.)
//
uint8_t OneWire::crc8(const uint8_t *addr, uint8_t len)
{
	uint8_t crc = 0;

	while (len--) {
		crc = pgm_read_byte(dscrc_table + (crc ^ *addr++));
	}
	return crc;
}
#else
//
// Compute a Dallas Semiconductor 8 bit CRC directly.