| Brian Silverman | 2f59450 | 2013-10-16 10:29:47 -0700 | [diff] [blame^] | 1 | #include "aos/common/util/wrapping_counter.h" |
| 2 | |||||
| 3 | namespace aos { | ||||
| 4 | namespace util { | ||||
| 5 | |||||
| 6 | WrappingCounter::WrappingCounter(int32_t initial_count) | ||||
| 7 | : count_(initial_count), last_count_(0) {} | ||||
| 8 | |||||
| 9 | int32_t WrappingCounter::Update(uint8_t current) { | ||||
| 10 | if (last_count_ > current) { | ||||
| 11 | count_ += 0x100; | ||||
| 12 | } | ||||
| 13 | count_ = (count_ & 0xffffff00) | current; | ||||
| 14 | last_count_ = current; | ||||
| 15 | return count_; | ||||
| 16 | } | ||||
| 17 | |||||
| 18 | } // namespace util | ||||
| 19 | } // namespace aos | ||||