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POCSAG clock detection 🐋 improvement(?) (#1442)

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* WIP convergence
* Tighter code, allow for sample nudges during clock discovery.
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Kyle Reed 2023-09-09 08:49:22 -07:00 • committed by GitHub
parent 4926cf8df5
commit b28283271b
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2 changed files with 66 additions and 56 deletions
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22
firmware/baseband/proc_pocsag2.hpp
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@ -91,17 +91,25 @@ class BitExtractor {
static constexpr uint32_t clock_magic_number = 0xAAAAAAAA;
struct RateInfo {
enum class State : uint8_t {
WaitForSample,
ReadyToSend
};
const int16_t baud_rate = 0;
float sample_interval = 0.0;
State state = State::WaitForSample;
float samples_until_next = 0.0;
float last_sample = 0.0;
bool prev_value = false;
bool is_stable = false;
BitQueue bits{};
};
/* Updates a rate info with the given sample.
* Returns true if the rate info has a new bit in its queue. */
bool handle_sample(RateInfo& rate, float sample);
/* Updates a rate info with the given sample.
* Returns true if the rate info has a new bit in its queue. */
bool handle_sample(float sample);
void reset();
};
std::array<RateInfo, 3> known_rates_{
RateInfo{512},
@ -112,10 +120,6 @@ class BitExtractor {
uint32_t sample_rate_ = 0;
RateInfo* current_rate_ = nullptr;
float samples_until_next_ = 0.0;
float prev_sample_ = 0.0;
bool ready_to_send_ = false;
};
/* Extracts codeword batches from the BitQueue. */