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Rework BitHistory, BitPattern, PacketBuilder.

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Templatize PacketBuilder to optionally bit unstuff, and have flexible packet termination behavior.
This commit is contained in:
Jared Boone
2015-11-09 14:38:09 -08:00
parent 0b522abbc1
commit 0789d50fdf
5 changed files with 59 additions and 69 deletions
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51
firmware/common/bit_pattern.hpp
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@@ -25,8 +25,29 @@
#include <cstdint>
#include <cstddef>
class BitHistory {
public:
void add(const uint_fast8_t bit) {
history = (history << 1) | (bit & 1);
}
uint32_t value() const {
return history;
}
private:
uint32_t history { 0 };
};
class BitPattern {
public:
constexpr BitPattern(
) : code_ { 0 },
mask_ { 0 },
maximum_hanning_distance_ { 0 }
{
}
constexpr BitPattern(
const uint32_t code,
const size_t code_length,
@@ -37,16 +58,10 @@ public:
{
}
uint32_t code() const {
return code_;
}
uint32_t mask() const {
return mask_;
}
size_t maximum_hanning_distance() const {
return maximum_hanning_distance_;
bool operator()(const BitHistory& history, const size_t) const {
const auto delta_bits = (history.value() ^ code_) & mask_;
const size_t count = __builtin_popcountl(delta_bits);
return (count <= maximum_hanning_distance_);
}
private:
@@ -55,20 +70,4 @@ private:
size_t maximum_hanning_distance_;
};
class BitHistory {
public:
void add(const uint_fast8_t bit) {
history = (history << 1) | (bit & 1);
}
bool matches(const BitPattern& pattern) const {
const auto delta_bits = (history ^ pattern.code()) & pattern.mask();
const size_t count = __builtin_popcountl(delta_bits);
return (count <= pattern.maximum_hanning_distance());
}
private:
uint32_t history { 0 };
};
#endif/*__BIT_PATTERN_H__*/