Backlight brightness resets on ledc access

[CelliesProjects]

Environment ( 実行環境 )

• PlatformIO

• MCU or Board name: [ESP32-S3-BOX-LITE]

Problem Description ( 問題の内容 )

I have an issue with the brightness setting.

Expected Behavior ( 期待される動作 )

The brightness should stay at the selected level.

Actual Behavior ( 実際の動作 )

The brightness resets to the default level.

I think it might be related related to the rest of the code, which is a ledc controller using 5 channels. But I fail to see how.

Here is the boot log:

         Connected!
[  2266][I][main.cpp:177] setup(): aquacontrol v2
[  2282][I][main.cpp:199] setup(): mounted SD
[  2289][I][main.cpp:50] parseTimerFile(): parsing '/default.aqu'
[  2301][E][main.cpp:142] parseTimerFile(): duplicate timer entry at line 33 for channel 4 at time 71460
[  2310][I][main.cpp:213] setup(): ch 0: 8 timers
[  2315][I][main.cpp:214] setup(): ch 1: 6 timers
[  2319][I][main.cpp:215] setup(): ch 2: 6 timers
[  2324][I][main.cpp:216] setup(): ch 3: 6 timers
[  2328][I][main.cpp:217] setup(): ch 4: 6 timers
[  2379][I][LGFX_AutoDetect_ESP32_all.hpp:1028] init_impl(): [LovyanGFX] [Autodetect] load from NVS : board:53
[  2406][I][LGFX_AutoDetect_ESP32_all.hpp:1264] setup(): [LovyanGFX] [Autodetect] ESP32_S3_BOX_Lite
[  2416][I][esp32-hal-ledc.c:166] ledcAttachChannel(): LEDC attached to pin 45 (channel 0, resolution 9)
[  2685][W][STA.cpp:135] _onStaArduinoEvent(): Reason: 202 - AUTH_FAIL
[  2691][W][STA.cpp:537] disconnect(): STA already disconnected.
[  7040][W][STA.cpp:135] _onStaArduinoEvent(): Reason: 2 - AUTH_EXPIRE
[  7047][W][STA.cpp:537] disconnect(): STA already disconnected.
[  7832][I][main.cpp:242] setup(): syncing NTP
[ 12406][I][main.cpp:45] ntpCb(): NTP synced
[ 12410][I][esp32-hal-ledc.c:166] ledcAttachChannel(): LEDC attached to pin 38 (channel 1, resolution 14)
[ 12420][I][esp32-hal-ledc.c:166] ledcAttachChannel(): LEDC attached to pin 39 (channel 2, resolution 14)
[ 12429][I][esp32-hal-ledc.c:166] ledcAttachChannel(): LEDC attached to pin 40 (channel 3, resolution 14)
[ 12438][I][esp32-hal-ledc.c:166] ledcAttachChannel(): LEDC attached to pin 41 (channel 4, resolution 14)
[ 12448][I][esp32-hal-ledc.c:166] ledcAttachChannel(): LEDC attached to pin 42 (channel 5, resolution 14)
[ 12657][I][dimmerTask.cpp:108] dimmerTask(): moon visible 85.240039 angle 134

From looking with a scope I learned that the reset happens around the time the rest of the ledc channels are initialised.

This is the ledc init code:

void dimmerTask(void *parameter)
{
    constexpr const uint8_t ledPin[NUMBER_OF_CHANNELS] = {38, 39, 40, 41, 42};
    constexpr const float fullMoonLevel[NUMBER_OF_CHANNELS] = {0, 0, 0, 0, 0.06};

    const int freq = 1220;
    for (int index = 0; index < NUMBER_OF_CHANNELS; index++)
        if (!ledcAttach(ledPin[index], freq, SOC_LEDC_TIMER_BIT_WIDTH))
        {
            log_e("Error setting ledc pin %i. system halted", index);
            while (1)
                delay(1000);
        }
        ...

Fixed.