Memory leak in ledcWriteTone

[qianqin]

Hardware:

Board: ESP32-CAM
Core Installation version: 2.1.0
IDE name: Platform.io
Flash Frequency: 40Mhz
PSRAM enabled: yes
Upload Speed: 115200
Computer OS: Windows 10

Description:

After each call of ledcWriteTone, free memory is reduced by 28 bytes if frequency parameter is higher than 0.

Sketch:

#include <Arduino.h>

uint8_t channel;

void setup() {
  ledcSetup(channel, 0, 8);
  ledcAttachPin(12, channel);
}

void loop() {
  log_i("free memory %uB", esp_get_free_heap_size());
  ledcWriteTone(channel, 1000);
  delay(100);
  ledcWriteTone(channel, 0);
  delay(1000);
}

Debug Messages:

Enable Core debug level: 5

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5828
entry 0x400806ac
[D][esp32-hal-psram.c:47] psramInit(): PSRAM enabled
[I][main.cpp:11] loop(): free memory 4483656B
[I][main.cpp:11] loop(): free memory 4483628B
[I][main.cpp:11] loop(): free memory 4483600B
[I][main.cpp:11] loop(): free memory 4483572B
[I][main.cpp:11] loop(): free memory 4483544B
[I][main.cpp:11] loop(): free memory 4483516B
[I][main.cpp:11] loop(): free memory 4483488B
[I][main.cpp:11] loop(): free memory 4483460B
[I][main.cpp:11] loop(): free memory 4483432B
[I][main.cpp:11] loop(): free memory 4483404B
[I][main.cpp:11] loop(): free memory 4483376B

[qianqin]

seems to be duplicate of #3555