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Remove floating point calculation from ac_dimmer ISR (#3770)

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Azimath 2022-09-14 19:54:33 -04:00 committed by GitHub
parent 0ac4c055de
commit 917bbc669c
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1 changed files with 3 additions and 5 deletions
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8
esphome/components/ac_dimmer/ac_dimmer.cpp
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@ -121,11 +121,8 @@ void IRAM_ATTR HOT AcDimmerDataStore::gpio_intr() {
// calculate time until enable in µs: (1.0-value)*cycle_time, but with integer arithmetic // calculate time until enable in µs: (1.0-value)*cycle_time, but with integer arithmetic
// also take into account min_power // also take into account min_power
auto min_us = this->cycle_time_us * this->min_power / 1000; auto min_us = this->cycle_time_us * this->min_power / 1000;
// calculate required value to provide a true RMS voltage output this->enable_time_us = std::max((uint32_t) 1, ((65535 - this->value) * (this->cycle_time_us - min_us)) / 65535);
this->enable_time_us =
std::max((uint32_t) 1, (uint32_t)((65535 - (acos(1 - (2 * this->value / 65535.0)) / 3.14159 * 65535)) *
(this->cycle_time_us - min_us)) /
65535);
if (this->method == DIM_METHOD_LEADING_PULSE) { if (this->method == DIM_METHOD_LEADING_PULSE) {
// Minimum pulse time should be enough for the triac to trigger when it is close to the ZC zone // Minimum pulse time should be enough for the triac to trigger when it is close to the ZC zone
// this is for brightness near 99% // this is for brightness near 99%
@ -206,6 +203,7 @@ void AcDimmer::setup() {
#endif #endif
} }
void AcDimmer::write_state(float state) { void AcDimmer::write_state(float state) {
state = std::acos(1 - (2 * state)) / 3.14159; // RMS power compensation
auto new_value = static_cast<uint16_t>(roundf(state * 65535)); auto new_value = static_cast<uint16_t>(roundf(state * 65535));
if (new_value != 0 && this->store_.value == 0) if (new_value != 0 && this->store_.value == 0)
this->store_.init_cycle = this->init_with_half_cycle_; this->store_.init_cycle = this->init_with_half_cycle_;