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- // Copyright 2014 Quoc-Viet Nguyen. All rights reserved.
- // This software may be modified and distributed under the terms
- // of the BSD license. See the LICENSE file for details.
- package modbus
- // Longitudinal Redundancy Checking
- type lrc struct {
- sum uint8
- }
- func (lrc *lrc) reset() *lrc {
- lrc.sum = 0
- return lrc
- }
- func (lrc *lrc) pushByte(b byte) *lrc {
- lrc.sum += b
- return lrc
- }
- func (lrc *lrc) pushBytes(data []byte) *lrc {
- var b byte
- for _, b = range data {
- lrc.sum += b
- }
- return lrc
- }
- func (lrc *lrc) value() byte {
- // Return twos complement
- return uint8(-int8(lrc.sum))
- }
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