| 565 | } |
| 566 | |
| 567 | uint16_t OneWire::crc16(const uint8_t* input, uint16_t len, uint16_t crc) |
| 568 | { |
| 569 | #if defined(__AVR__) |
| 570 | for (uint16_t i = 0 ; i < len ; i++) { |
| 571 | crc = _crc16_update(crc, input[i]); |
| 572 | } |
| 573 | #else |
| 574 | static const uint8_t oddparity[16] = |
| 575 | { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 }; |
| 576 | |
| 577 | for (uint16_t i = 0 ; i < len ; i++) { |
| 578 | // Even though we're just copying a byte from the input, |
| 579 | // we'll be doing 16-bit computation with it. |
| 580 | uint16_t cdata = input[i]; |
| 581 | cdata = (cdata ^ crc) & 0xff; |
| 582 | crc >>= 8; |
| 583 | |
| 584 | if (oddparity[cdata & 0x0F] ^ oddparity[cdata >> 4]) |
| 585 | crc ^= 0xC001; |
| 586 | |
| 587 | cdata <<= 6; |
| 588 | crc ^= cdata; |
| 589 | cdata <<= 1; |
| 590 | crc ^= cdata; |
| 591 | } |
| 592 | #endif |
| 593 | return crc; |
| 594 | } |
| 595 | #endif |
| 596 | |
| 597 | #endif |
nothing calls this directly
no outgoing calls
no test coverage detected