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Calculate PWM wrap dynamically whenever the frequency is changed (#4294)
fixes https://github.com/esphome/issues/issues/3841
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27185265f6
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a45646af1b
2 changed files with 11 additions and 3 deletions
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@ -9,6 +9,7 @@
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#include <hardware/clocks.h>
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#include <hardware/gpio.h>
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#include <hardware/pwm.h>
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#include <cmath>
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namespace esphome {
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namespace rp2040_pwm {
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@ -23,8 +24,14 @@ void RP2040PWM::setup() {
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void RP2040PWM::setup_pwm_() {
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pwm_config config = pwm_get_default_config();
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pwm_config_set_clkdiv(&config, clock_get_hz(clk_sys) / (255.0f * this->frequency_));
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pwm_config_set_wrap(&config, 254);
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uint32_t clock = clock_get_hz(clk_sys);
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float divider = ceil(clock / (4096 * this->frequency_)) / 16.0f;
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uint16_t wrap = clock / divider / this->frequency_ - 1;
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this->wrap_ = wrap;
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pwm_config_set_clkdiv(&config, divider);
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pwm_config_set_wrap(&config, wrap);
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pwm_init(pwm_gpio_to_slice_num(this->pin_->get_pin()), &config, true);
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}
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@ -48,7 +55,7 @@ void HOT RP2040PWM::write_state(float state) {
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}
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gpio_set_function(this->pin_->get_pin(), GPIO_FUNC_PWM);
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pwm_set_gpio_level(this->pin_->get_pin(), state * 255.0f);
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pwm_set_gpio_level(this->pin_->get_pin(), state * this->wrap_);
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}
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} // namespace rp2040_pwm
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@ -34,6 +34,7 @@ class RP2040PWM : public output::FloatOutput, public Component {
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InternalGPIOPin *pin_;
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float frequency_{1000.0};
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uint16_t wrap_{65535};
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/// Cache last output level for dynamic frequency updating
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float last_output_{0.0};
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bool frequency_changed_{false};
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