239 lines
11 KiB
C++
239 lines
11 KiB
C++
#include "Core.h"
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#include <math.h>
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#include <string.h>
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const char *roleName(Role r) {
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static const char *names[] = {"SOLO", "MASTER", "SLAVE"};
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const uint8_t i = static_cast<uint8_t>(r);
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return i < 3 ? names[i] : "?";
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}
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const char *failName(FailReason r) {
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static const char *names[] = {"NONE", "NO SIGNAL", "PERIOD OUT", "DUTY OUT",
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"EXTRA EDGE", "GLITCH", "LOST EDGE", "TOO FEW PERIODS", "LINK LOST",
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"UNSUPPORTED", "RESOLUTION", "ABORTED"};
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const uint8_t i = static_cast<uint8_t>(r);
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return i < (sizeof(names) / sizeof(names[0])) ? names[i] : "UNKNOWN";
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}
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void StageStats::reset() {
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memset(this, 0, sizeof(*this));
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minPeriod = minActive = UINT32_MAX;
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reason = FailReason::NONE;
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}
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uint32_t settingsChecksum(const Settings &s) {
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const uint8_t *p = reinterpret_cast<const uint8_t *>(&s);
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const size_t n = offsetof(Settings, checksum);
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uint32_t hash = 2166136261UL;
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for (size_t i = 0; i < n; ++i) { hash ^= p[i]; hash *= 16777619UL; }
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return hash;
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}
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uint32_t frequencyPointCount(uint32_t startHz, uint32_t endHz, uint32_t stepHz) {
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if (!startHz || !stepHz || endHz <= startHz) return 0;
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const uint64_t span = static_cast<uint64_t>(endHz) - startHz;
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return static_cast<uint32_t>(span / stepHz + 1U + ((span % stepHz) ? 1U : 0U));
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}
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uint32_t frequencyAt(uint32_t startHz, uint32_t endHz, uint32_t stepHz, uint32_t index) {
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const uint32_t count = frequencyPointCount(startHz, endHz, stepHz);
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if (!count || index >= count) return 0;
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if (index == count - 1) return endHz;
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const uint64_t v = static_cast<uint64_t>(startHz) + static_cast<uint64_t>(stepHz) * index;
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return v < endHz ? static_cast<uint32_t>(v) : endHz;
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}
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uint64_t nominalTotalUs(const TestParams &p, uint32_t settleCycles) {
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uint64_t total = 0;
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const uint32_t count = frequencyPointCount(p.startHz, p.endHz, p.stepHz);
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for (uint32_t i = 0; i < count; ++i) {
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const uint32_t f = frequencyAt(p.startHz, p.endHz, p.stepHz, i);
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total += (1000000ULL * settleCycles + f - 1) / f;
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total += static_cast<uint64_t>(p.testTimeMs) * 1000ULL * p.repeats;
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}
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return total;
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}
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bool periodWithin(float measured, float expected, float tolerance) {
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return expected > 0.0f && fabsf(measured - expected) * 100.0f / expected <= tolerance + 0.0001f;
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}
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bool dutyWithin(float measured, float expected, float tolerance) {
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return fabsf(measured - expected) <= tolerance + 0.0001f;
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}
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uint8_t choosePwmResolution(uint32_t frequencyHz, uint32_t sourceClockHz,
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uint8_t maxBits) {
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if (!frequencyHz || !sourceClockHz || !maxBits) return 0;
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uint8_t bits = maxBits;
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while (bits > 1 && static_cast<uint64_t>(frequencyHz) * (1ULL << bits) > sourceClockHz)
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--bits;
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return bits;
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}
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uint8_t chooseStablePwmResolution(uint32_t frequencyHz, uint32_t sourceClockHz,
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uint8_t maxBits, uint8_t dutyPct) {
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const uint8_t fallback = choosePwmResolution(frequencyHz, sourceClockHz, maxBits);
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if (!fallback || dutyPct > 100U) return fallback;
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for (uint8_t bits = fallback; bits > 0; --bits) {
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const uint32_t levels = 1UL << bits;
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const uint64_t denominator = static_cast<uint64_t>(frequencyHz) * levels;
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if (denominator > sourceClockHz || sourceClockHz % denominator) continue;
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const uint32_t divider = static_cast<uint32_t>(sourceClockHz / denominator);
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if (!divider || divider > 1024U) continue;
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if ((static_cast<uint32_t>(levels) * dutyPct) % 100U == 0U) return bits;
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}
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return fallback;
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}
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bool chooseIntegerPwmConfig(uint32_t requestedHz, uint32_t sourceClockHz,
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uint8_t maxBits, uint8_t dutyPct,
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IntegerPwmConfig &config) {
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if (!requestedHz || !sourceClockHz || !maxBits || dutyPct > 100U) return false;
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bool found = false;
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uint64_t bestError = 0;
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uint32_t bestDenominator = 1;
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uint32_t bestDutyError = 0;
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uint32_t bestLevels = 1;
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for (uint8_t bits = 1; bits <= maxBits && bits < 31; ++bits) {
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const uint32_t levels = 1UL << bits;
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const uint64_t requestedProduct = static_cast<uint64_t>(requestedHz) * levels;
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uint32_t lowerDivider = static_cast<uint32_t>(sourceClockHz / requestedProduct);
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if (lowerDivider < 1U) lowerDivider = 1U;
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if (lowerDivider > 1023U) lowerDivider = 1023U;
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const uint32_t candidates[] = {lowerDivider,
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lowerDivider < 1023U ? lowerDivider + 1U : lowerDivider};
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for (uint8_t candidate = 0; candidate < 2; ++candidate) {
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const uint32_t divider = candidates[candidate];
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if (candidate && divider == candidates[0]) continue;
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const uint32_t denominator = levels * divider;
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const uint64_t targetClock = static_cast<uint64_t>(requestedHz) * denominator;
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const uint64_t error = targetClock > sourceClockHz
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? targetClock - sourceClockHz : sourceClockHz - targetClock;
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const uint32_t dutyCount = (static_cast<uint64_t>(levels) * dutyPct + 50U) / 100U;
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const uint32_t representedDuty = dutyCount * 100U;
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const uint32_t requestedDuty = levels * dutyPct;
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const uint32_t dutyError = representedDuty > requestedDuty
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? representedDuty - requestedDuty : requestedDuty - representedDuty;
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const bool frequencyBetter = !found ||
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error * bestDenominator < bestError * denominator;
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const bool frequencyEqual = found &&
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error * bestDenominator == bestError * denominator;
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const bool dutyBetter = frequencyEqual &&
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static_cast<uint64_t>(dutyError) * bestLevels <
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static_cast<uint64_t>(bestDutyError) * levels;
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const bool dutyEqual = frequencyEqual &&
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static_cast<uint64_t>(dutyError) * bestLevels ==
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static_cast<uint64_t>(bestDutyError) * levels;
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if (!frequencyBetter && !dutyBetter && !(dutyEqual && bits > config.bits)) continue;
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config.actualHz = static_cast<uint32_t>(
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(static_cast<uint64_t>(sourceClockHz) + denominator / 2U) / denominator);
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config.divider = static_cast<uint16_t>(divider);
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config.bits = bits;
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bestError = error;
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bestDenominator = denominator;
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bestDutyError = dutyError;
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bestLevels = levels;
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found = true;
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}
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}
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return found;
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}
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FailReason validateResolution(uint32_t frequencyHz, float dutyPct, float accuracyPct,
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uint32_t captureHz, uint8_t pwmBits) {
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if (!frequencyHz || !captureHz || !pwmBits) return FailReason::RESOLUTION;
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const float periodTicks = static_cast<float>(captureHz) / frequencyHz;
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const float activeTicks = periodTicks * dutyPct / 100.0f;
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const float inactiveTicks = periodTicks - activeTicks;
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if (periodTicks < 4.0f || activeTicks < 2.0f || inactiveTicks < 2.0f) return FailReason::RESOLUTION;
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const float timerPeriodError = 100.0f / periodTicks;
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const float timerDutyError = 100.0f / periodTicks;
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// Measurement uses the duty actually programmed into LEDC. A coarse PWM
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// step is not itself an error when the requested value (e.g. 50%) is exactly
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// representable; only the selected value's actual quantization matters.
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return (timerPeriodError > accuracyPct || timerDutyError > accuracyPct)
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? FailReason::RESOLUTION : FailReason::NONE;
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}
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FailReason evaluatePeriod(const PulsePeriod &p, uint32_t tickHz, float expectedHz,
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float expectedDuty, float tolerance, uint8_t repeat,
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StageStats &s) {
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if (!p.periodTicks || p.activeTicks >= p.periodTicks) return FailReason::EXTRA_EDGE;
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const float hz = static_cast<float>(tickHz) / p.periodTicks;
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const float duty = 100.0f * p.activeTicks / p.periodTicks;
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++s.periods;
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s.periodSum += p.periodTicks; s.activeSum += p.activeTicks;
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if (p.periodTicks < s.minPeriod) s.minPeriod = p.periodTicks;
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if (p.periodTicks > s.maxPeriod) s.maxPeriod = p.periodTicks;
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if (p.activeTicks < s.minActive) s.minActive = p.activeTicks;
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if (p.activeTicks > s.maxActive) s.maxActive = p.activeTicks;
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FailReason reason = FailReason::NONE;
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if (!periodWithin(hz, expectedHz, tolerance)) reason = FailReason::PERIOD_OUT;
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else if (!dutyWithin(duty, expectedDuty, tolerance)) reason = FailReason::DUTY_OUT;
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if (reason != FailReason::NONE && s.reason == FailReason::NONE) {
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s.reason = reason; s.firstBadPeriod = s.periods; s.firstBadRepeat = repeat;
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s.badFrequency = hz; s.badDuty = duty;
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}
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return reason;
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}
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bool makePeriodLimits(uint32_t expectedHz, float expectedDuty, float tolerance,
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uint32_t tickHz, PeriodLimits &limits) {
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if (!expectedHz || !tickHz || tolerance < 0.0f || tolerance >= 100.0f ||
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expectedDuty <= 0.0f || expectedDuty >= 100.0f) return false;
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const uint32_t toleranceX100 = static_cast<uint32_t>(lroundf(tolerance * 100.0f));
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const uint32_t dutyX100 = static_cast<uint32_t>(lroundf(expectedDuty * 100.0f));
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const uint64_t numerator = static_cast<uint64_t>(tickHz) * 10000ULL;
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const uint64_t highDenominator = static_cast<uint64_t>(expectedHz) * (10000U + toleranceX100);
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const uint64_t lowDenominator = static_cast<uint64_t>(expectedHz) * (10000U - toleranceX100);
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limits.minPeriodTicks = static_cast<uint32_t>((numerator + highDenominator - 1U) / highDenominator);
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limits.maxPeriodTicks = static_cast<uint32_t>(numerator / lowDenominator);
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limits.minDutyX100 = dutyX100 > toleranceX100 ? dutyX100 - toleranceX100 : 0;
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limits.maxDutyX100 = dutyX100 + toleranceX100;
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return limits.minPeriodTicks && limits.maxPeriodTicks >= limits.minPeriodTicks;
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}
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FailReason evaluatePeriodFast(const PulsePeriod &p, uint32_t tickHz,
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const PeriodLimits &limits, uint8_t repeat,
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StageStats &s) {
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if (!p.periodTicks || p.activeTicks >= p.periodTicks) return FailReason::EXTRA_EDGE;
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++s.periods;
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s.periodSum += p.periodTicks; s.activeSum += p.activeTicks;
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if (p.periodTicks < s.minPeriod) s.minPeriod = p.periodTicks;
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if (p.periodTicks > s.maxPeriod) s.maxPeriod = p.periodTicks;
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if (p.activeTicks < s.minActive) s.minActive = p.activeTicks;
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if (p.activeTicks > s.maxActive) s.maxActive = p.activeTicks;
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FailReason reason = FailReason::NONE;
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if (p.periodTicks < limits.minPeriodTicks || p.periodTicks > limits.maxPeriodTicks) {
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reason = FailReason::PERIOD_OUT;
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} else {
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// The configured range (>= 1 kHz at 80 MHz capture) fits these products
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// into 32 bits. Keep a 64-bit fallback for unusually slow external input.
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if (p.periodTicks <= UINT32_MAX / 10000U && limits.maxDutyX100 <= 10000U) {
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const uint32_t scaledActive = p.activeTicks * 10000U;
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const uint32_t minActive = p.periodTicks * limits.minDutyX100;
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const uint32_t maxActive = p.periodTicks * limits.maxDutyX100;
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if (scaledActive < minActive || scaledActive > maxActive) reason = FailReason::DUTY_OUT;
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} else {
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const uint64_t scaledActive = static_cast<uint64_t>(p.activeTicks) * 10000ULL;
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const uint64_t minActive = static_cast<uint64_t>(p.periodTicks) * limits.minDutyX100;
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const uint64_t maxActive = static_cast<uint64_t>(p.periodTicks) * limits.maxDutyX100;
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if (scaledActive < minActive || scaledActive > maxActive) reason = FailReason::DUTY_OUT;
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}
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}
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if (reason != FailReason::NONE && s.reason == FailReason::NONE) {
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s.reason = reason; s.firstBadPeriod = s.periods; s.firstBadRepeat = repeat;
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s.badFrequency = static_cast<float>(tickHz) / p.periodTicks;
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s.badDuty = 100.0f * p.activeTicks / p.periodTicks;
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}
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return reason;
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}
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