hw_pwm.h

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#pragma once
 
#include "pico/stdlib.h"
#include "hardware/pwm.h"
#include "hardware/clocks.h"

class PWM
{
private:
    uint8_t slice;
    uint step_ns;
    uint period_us;
 
public:
    static uint32_t slice_mask;

    static void StartTogether();

    PWM(uint gpio_ch_A,
        uint gpio_ch_B,
        int step_ns,   // min = PERIOD_us * 1000 / 64535 < step_ns < max = 256 * 8ns*(phase_correct+1) = ca 2us
        int period_us, // period_us max = 64535 * step_ns*(phase_correct+1)
        bool phase_correct = false,
        bool ch_A_inverted = false,
        bool ch_B_inverted = false);

    void start(bool enabled);

    void set_width_nb_of_step(uint gpio_pin, uint16_t level);
    
    void set_duty_cycle(uint gpio_pin, float duty_cycle);
    
    void set_irq(irq_handler_t handler);
    
    void clear_irq();
};

class PWMgatedMeasure
{
private:
    uint8_t slice;
    uint measure_duration_us;
    uint resolution_ns;
 
public:
    
    PWMgatedMeasure(uint pin_gate,
                    uint resolution_ns, 
                    uint measure_duration_us);
    float measure_duty_cycle();
    
    uint16_t count_cycles();
};