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Calculate PWM wrap dynamically whenever the frequency is changed (#4294)

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fixes https://github.com/esphome/issues/issues/3841
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tradeJmark 2023-01-15 21:17:57 -04:00 committed by GitHub
parent 27185265f6
commit a45646af1b
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 3 deletions
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13
esphome/components/rp2040_pwm/rp2040_pwm.cpp
View file

@ -9,6 +9,7 @@
#include <hardware/clocks.h>
#include <hardware/gpio.h>
#include <hardware/pwm.h>
#include <cmath>
namespace esphome {
namespace rp2040_pwm {
@ -23,8 +24,14 @@ void RP2040PWM::setup() {
void RP2040PWM::setup_pwm_() {
pwm_config config = pwm_get_default_config();
pwm_config_set_clkdiv(&config, clock_get_hz(clk_sys) / (255.0f * this->frequency_));
pwm_config_set_wrap(&config, 254);
uint32_t clock = clock_get_hz(clk_sys);
float divider = ceil(clock / (4096 * this->frequency_)) / 16.0f;
uint16_t wrap = clock / divider / this->frequency_ - 1;
this->wrap_ = wrap;
pwm_config_set_clkdiv(&config, divider);
pwm_config_set_wrap(&config, wrap);
pwm_init(pwm_gpio_to_slice_num(this->pin_->get_pin()), &config, true);
}
@ -48,7 +55,7 @@ void HOT RP2040PWM::write_state(float state) {
}
gpio_set_function(this->pin_->get_pin(), GPIO_FUNC_PWM);
pwm_set_gpio_level(this->pin_->get_pin(), state * 255.0f);
pwm_set_gpio_level(this->pin_->get_pin(), state * this->wrap_);
}
} // namespace rp2040_pwm

1
esphome/components/rp2040_pwm/rp2040_pwm.h
View file

@ -34,6 +34,7 @@ class RP2040PWM : public output::FloatOutput, public Component {
InternalGPIOPin *pin_;
float frequency_{1000.0};
uint16_t wrap_{65535};
/// Cache last output level for dynamic frequency updating
float last_output_{0.0};
bool frequency_changed_{false};