72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
#include <LittleFS.h>
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#include "config.h"
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#include "history.h"
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static Sample s_buf[HISTORY_SIZE];
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static int s_head = 0; // next write position
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static int s_count = 0;
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void historyBegin() { s_head = 0; s_count = 0; }
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void historyAdd(uint32_t epoch, float mslHpa, float tempC) {
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s_buf[s_head] = Sample{ epoch, mslHpa, tempC };
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s_head = (s_head + 1) % HISTORY_SIZE;
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if (s_count < HISTORY_SIZE) s_count++;
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}
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int historyCount() { return s_count; }
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Sample historyGet(int i) {
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int start = (s_head - s_count + HISTORY_SIZE) % HISTORY_SIZE;
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return s_buf[(start + i) % HISTORY_SIZE];
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}
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Sample historyLatest() { return historyGet(s_count - 1); }
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bool historyTrendDelta(float& outDelta) {
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if (s_count < 2) return false;
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Sample latest = historyLatest();
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uint32_t target = latest.epoch - 10800UL; // 3 h earlier
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int idx = -1;
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for (int i = 0; i < s_count; i++) {
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if (historyGet(i).epoch <= target) idx = i; else break;
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}
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if (idx < 0) return false;
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Sample past = historyGet(idx);
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if (latest.epoch - past.epoch < 9000UL) return false; // need >= 2.5 h span
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outDelta = latest.mslHpa - past.mslHpa;
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return true;
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}
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static const char* HPATH = "/history.dat";
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// Binary format: [int32 count][count * Sample], stored oldest-first.
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bool historySave() {
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File f = LittleFS.open(HPATH, "w");
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if (!f) return false;
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int32_t n = s_count;
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f.write((const uint8_t*)&n, sizeof(n));
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for (int i = 0; i < s_count; i++) {
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Sample s = historyGet(i);
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f.write((const uint8_t*)&s, sizeof(s));
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}
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f.close();
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return true;
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}
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bool historyLoad() {
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File f = LittleFS.open(HPATH, "r");
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if (!f) return false;
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int32_t n = 0;
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if (f.read((uint8_t*)&n, sizeof(n)) != sizeof(n)) { f.close(); return false; }
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if (n < 0 || n > HISTORY_SIZE) { f.close(); return false; }
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s_head = 0; s_count = 0;
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for (int i = 0; i < n; i++) {
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Sample s;
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if (f.read((uint8_t*)&s, sizeof(s)) != sizeof(s)) break;
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historyAdd(s.epoch, s.mslHpa, s.tempC);
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}
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f.close();
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return true;
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}
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