esp32 - IR intervalometer for Sony a7

I tried analogWrite() yesterday, but nothing came of it. Perhaps I just made a mistake somewhere.

// Header data burst
// Header Burst Timing is 2.4mS
// Quiet Timing is 600uS

// Send one data burst
// Burst Timing is 1.2mS
// Quiet Timing is 600uS

// Send zero data burst
// Burst Timing is 600uS
// Quiet Timing is 600uS
const IR_ANODE = D17;
const IR_CATHODE = D16;

const IR_FREQ = 40000;
const pulse_ratio = 0.25;

//....

var run = function () {

//....
  
    let header_pulses = [2.4, 0.6];
    let command_pulses = [1.2, 0.6, 0.6, 0.6, 1.2, 0.6, 1.2, 0.6, 0.6, 0.6, 1.2, 0.6, 0.6, 0.6];
    let address_pulses = [0.6, 0.6, 1.2, 0.6, 0.6, 0.6, 1.2, 0.6, 1.2, 0.6, 1.2, 0.6, 0.6, 0.6, 0.6, 0.6, 0.6, 0.6, 1.2, 0.6, 1.2, 0.6, 1.2, 0.6, 1.2, 0.6];
    let pause = 11;
  

    function code(){
        digitalPulse(IR_CATHODE,0,command_pulses);
        digitalPulse(IR_CATHODE,0,address_pulses);
        digitalPulse(IR_CATHODE,1,pause); 
    }

    function header(){
      digitalPulse(IR_CATHODE,0,header_pulses);
    }

    function shot(){
        analogWrite(IR_ANODE, pulse_ratio, { freq : IR_FREQ } );
        for (let i=0; i < 3; i++){
            header();
            code();
        }
        digitalPulse(IR_CATHODE, 1, 0);
        digitalRead(IR_ANODE);
    }

//....
    function some_function(){
        //....
        console.log('shot');
        shot();
        //....
    }
//....

};

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