PWM does not work on STM32F407VET6

[ghost]

Hey! I am using STM32F407VET6 board: https://stm32-base.org/boards/STM32F407VET6-STM32-F4VE-V2.0 According to the scheme, LEDs are connected to pins PA6 and PA7. I tried to control them using PWM. But nothing happened. There is no PWM signal. The LEDs are either on or off. Here is some sample code I used:

void setup() {
    pinMode(PA6, PWM);  // setup the pin as PWM
}

void loop()  {
    for (int fadeValue = 0; fadeValue <= 65535; fadeValue += 1280) {
        pwmWrite(PA6, fadeValue);
        delay(30);
    }
    for (int fadeValue = 65535 ; fadeValue >= 0; fadeValue -= 1280) {
        pwmWrite(PA6, fadeValue);
        delay(30);
    }
}

I tried analogWrite instead of pwmWrite, but it didn't affect anything. I've tried some other pins as well. But PWM doesn't work anywhere. Can you fix this somehow?