Sama5d3 pwm-buzzer sound while boot kernel

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Alexdev
Posts: 22
Joined: Thu Oct 22, 2015 9:14 am

Sama5d3 pwm-buzzer sound while boot kernel

Tue Aug 09, 2016 5:39 pm

Hi I have a sama5d3 Xplained, I have connected a buzzer in the port PE31. I have configurate this port like:
sama5d3.dtsi
pinctrl_pwm0_pwml1_2: pwm0_pwml1-2 {
atmel,pins =
<AT91_PIOE 31 AT91_PERIPH_B AT91_PINCTRL_NONE>; /* conflicts with IRQ */
};
at91-sama5d3_xplained.dts
pwm0: pwm@f002c000 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm0_pwmh0_0 &pinctrl_pwm0_pwmh1_0 &pinctrl_pwm0_pwml1_2>;
status = "okay";
};

The buzzer works well but I have a little problem. When I boot the Xplained when the kernel is run I can hear a buzz.
it seems that during the configuration of this pin there is a change in the output level that makes it sound.

Is there any way to avoid this?
Is this the pin PE31 properly configured to function as PWM output?

Thanks!
Regards!!

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