BlackMark
ab78d94872
Same controller: thermistor on ADC0 averaged over 1000 free-running conversions, 50 kHz fan PWM on OC0B, 115200 Bd console with the full command set, EEPROM temperature histogram, watchdog-reset path into the boot section. The Steinhart-Hart math and the libm log are gone — the Beta equation and the cubic fan curve are consteval-evaluated into flash tables; the firmware never does floating point. Byte-identical .text in both libavr modes. Legacy stays on master. Co-Authored-By: Claude <noreply@anthropic.com>
106 lines
2.2 KiB
C++
106 lines
2.2 KiB
C++
#pragma once
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#include <array>
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#include <cstdint>
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#include <libavr/libavr.hpp>
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#include "board.hpp"
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// Temperature histogram: one uint32 bucket per °C 0..99, sampled once a
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// second, written back to EEPROM every 30 minutes (update() only touches
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// changed bytes). Erased EEPROM reads back as 0xffffffff — treated as 0.
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namespace app {
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class statistics {
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static constexpr std::uint8_t range = 100;
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static constexpr std::uint32_t sample_delay_ms = 1'000;
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static constexpr std::uint32_t writeback_delay_ms = 1'800'000;
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using stored = avr::eeprom::var<std::array<std::uint32_t, range>, 0>;
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static inline std::array<std::uint32_t, range> histogram{};
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static inline std::uint64_t last_sample = 0;
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static inline std::uint64_t last_writeback = 0;
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static constexpr std::uint8_t clamp(std::int8_t t)
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{
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return t < 0 ? 0 : (t >= range ? range - 1 : static_cast<std::uint8_t>(t));
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}
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public:
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static constexpr auto claims = stored::claims;
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static void init()
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{
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histogram = stored::read();
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for (auto &bucket : histogram)
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if (bucket == 0xffffffff)
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bucket = 0;
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}
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static void record(std::int8_t celsius)
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{
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auto now = uptime::millis();
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if (now >= last_sample + sample_delay_ms) {
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++histogram[clamp(celsius)];
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last_sample = now;
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}
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if (now >= last_writeback + writeback_delay_ms) {
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save();
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last_writeback = now;
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}
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}
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static void save()
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{
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stored::update(histogram);
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}
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static void reset()
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{
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histogram = {};
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stored::update(histogram);
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}
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static std::uint8_t min_temperature()
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{
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for (std::uint8_t i = 0; i < range; ++i)
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if (histogram[i])
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return i;
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return range;
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}
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static std::uint8_t max_temperature()
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{
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for (std::uint8_t i = range; i > 0; --i)
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if (histogram[i - 1])
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return i - 1;
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return 0;
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}
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static std::uint64_t total_samples()
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{
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std::uint64_t total = 0;
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for (auto bucket : histogram)
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total += bucket;
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return total;
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}
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static std::uint32_t highest_bucket()
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{
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std::uint32_t highest = 0;
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for (auto bucket : histogram)
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if (bucket > highest)
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highest = bucket;
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return highest;
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}
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static std::uint32_t bucket(std::uint8_t celsius)
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{
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return histogram[clamp(static_cast<std::int8_t>(celsius))];
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}
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};
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} // namespace app
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