How tom change generator frequency

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5

I did it this way but k doesn't change

//https://www.i-programmer.info/programming/148-hardware/17804-programming-the-esp32-in-c-pwm-first-example.html?start=4#google_vignette
#include <driver/ledc.h>
int k;
//+++++++++++++++++++++++++++++++
void frequencyChange()  //void somefunc()
// your variable here
{
  if (digitalRead(16) == LOW) {
    k++;
  }
  if (digitalRead(17) == LOW) {
    k--;
  }
  //++++++++++++++ // put your setup code here, to run once:+++++++++++++++

  ledc_timer_config_t timerConfig = {
    .speed_mode = LEDC_LOW_SPEED_MODE,
    .duty_resolution = LEDC_TIMER_10_BIT,
    .timer_num = LEDC_TIMER_0,
    .freq_hz = k,              //+++++++++++++++++++++++++++++
    .clk_cfg = LEDC_AUTO_CLK
  };
  ledc_timer_config(&timerConfig);
  Serial.println(k);
  Serial.println("  k1  ");
  //+++++++++++++++++++++++++++++
}
//+++++++++++++++++++++++++++++++++
void setup() {
  Serial.begin(115200);
  pinMode(16, INPUT_PULLUP);    //k++
  pinMode(17, INPUT_PULLUP);   //k--
  /*
    ledc_timer_config_t timerConfig = {
      .speed_mode = LEDC_LOW_SPEED_MODE,
      .duty_resolution = LEDC_TIMER_10_BIT,
      .timer_num = LEDC_TIMER_0,
      .freq_hz = 10000,              //+++++++++++++++++++++++++++++
      .clk_cfg = LEDC_AUTO_CLK
    };
    ledc_timer_config(&timerConfig);
  */

  ledc_channel_config_t channelConfig1 = {
    .gpio_num = 18,
    .speed_mode = LEDC_LOW_SPEED_MODE,
    .channel = LEDC_CHANNEL_0,
    .timer_sel = LEDC_TIMER_0,
    .duty = 512,
    .hpoint = 0
  };
  ledc_channel_config(&channelConfig1);


  ledc_channel_config_t channelConfig2 = {
    .gpio_num = 19,
    .speed_mode = LEDC_LOW_SPEED_MODE,
    .channel = LEDC_CHANNEL_1,
    .timer_sel = LEDC_TIMER_0,
    .duty = 512,
    .hpoint = 256
  };
  ledc_channel_config(&channelConfig2);
}


void loop()
{

  Serial.println(k);
  Serial.println("  k2  ");
  delay( 100 );
}