ESP32 Change PWM Duty Cycle in Interrupt possible?

Advanced Solutions
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3

It works as you implied here is the new function myledcWrite that repaces ledcWrite:

void IRAM_ATTR myledcWrite(uint8_t chan, uint32_t duty)
{
    if (chan > 15)
    {
        return;
    }
    uint8_t group = (chan / 8), channel = (chan % 8);
    LEDC_CHAN(group, channel).duty.duty = duty << 4; //25 bit (21.4)
    if (duty)
    {
        LEDC_CHAN(group, channel).conf0.sig_out_en = 1; //This is the output enable control bit for channel
        LEDC_CHAN(group, channel).conf1.duty_start = 1; //When duty_num duty_cycle and duty_scale has been configured. these register won't take effect until set duty_start. this bit is automatically cleared by hardware.
        if (group)
        {
            LEDC_CHAN(group, channel).conf0.low_speed_update = 1;
        }
        else
        {
            LEDC_CHAN(group, channel).conf0.clk_en = 1;
        }
    }
    else
    {
        LEDC_CHAN(group, channel).conf0.sig_out_en = 0; //This is the output enable control bit for channel
        LEDC_CHAN(group, channel).conf1.duty_start = 0; //When duty_num duty_cycle and duty_scale has been configured. these register won't take effect until set duty_start. this bit is automatically cleared by hardware.
        if (group)
        {
            LEDC_CHAN(group, channel).conf0.low_speed_update = 1;
        }
        else
        {
            LEDC_CHAN(group, channel).conf0.clk_en = 0;
        }
    }
}