Улучшения

- улушчено отображение на OLED
- убраны настройки шага частоты и количества повторов
- сделан перебор только реализуемых частот
- увеличена точность, на 1МГц 1.25%, в остальных до 1%
- точное измерение TOTAL TIME

OpticalChannelTester/Core.h

@@ -17,10 +17,8 @@ struct Settings {
   uint8_t role;
   uint8_t startIndex;
   uint8_t endIndex;
-  uint8_t stepIndex;
   uint8_t accuracyIndex;
   uint8_t timeIndex;
-  uint8_t repeatIndex;
   uint8_t dutyIndex;
   uint32_t checksum;
 };
@@ -28,10 +26,8 @@ struct Settings {
 struct TestParams {
   uint32_t startHz;
   uint32_t endHz;
-  uint32_t stepHz;
   float accuracyPct;
   uint32_t testTimeMs;
-  uint8_t repeats;
   uint8_t dutyPct;
 };
 
@@ -72,11 +68,13 @@ struct IntegerPwmConfig {
 };
 
 uint32_t settingsChecksum(const Settings &s);
-uint32_t frequencyPointCount(uint32_t startHz, uint32_t endHz, uint32_t stepHz);
-uint32_t frequencyAt(uint32_t startHz, uint32_t endHz, uint32_t stepHz, uint32_t index);
+uint32_t frequencyPointCount(uint32_t startHz, uint32_t endHz);
+uint32_t frequencyAt(uint32_t startHz, uint32_t endHz, uint32_t index);
+uint64_t nominalStageUs(uint32_t frequencyHz, uint32_t sampleTimeMs, uint32_t settleCycles);
 uint64_t nominalTotalUs(const TestParams &p, uint32_t settleCycles);
 bool periodWithin(float measuredHz, float expectedHz, float tolerancePct);
 bool dutyWithin(float measuredPct, float expectedPct, float tolerancePct);
+float effectiveTolerancePct(float configuredPct);
 uint8_t choosePwmResolution(uint32_t frequencyHz, uint32_t sourceClockHz,
                             uint8_t maxBits);
 uint8_t chooseStablePwmResolution(uint32_t frequencyHz, uint32_t sourceClockHz,