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    SOLVED Raspberry pi zero audio output pwm not work

    Recalbox General
    zero audio output pwm
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    • Eron Barbosa
      Eron Barbosa last edited by

      I put this code "dtoverlay=pwm,pin=23,func=4" in config.txt but not work. 23 because gpio in raspberry zero is different i think. i use recalbox 4.0.1 and my programation level is 0

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      • Substring
        Substring @Eron Barbosa last edited by

        @ian57 do you have any suggestion ?

        Former dev - Please reply with @substring so that i am notified when you answer me
        Ex dev - Merci de me répondre en utilisant @substring pour que je sois notifé

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        • ian57
          ian57 Staff
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          last edited by

          @Eron-Barbosa Please take a look at https://github.com/recalbox/recalbox-os/wiki/Analog-Audio-Pi-Zero-(EN), everything is explained. The right configuration is the following :

          dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4
          

          "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

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          • Eron Barbosa
            Eron Barbosa last edited by

            work, but i change pin 18 by pin 12, gpio 18 i use for control and maybe are on conflict

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            • MartinCR
              MartinCR last edited by

              Hi guys!

              I'm completely crazy! I have been trying to fix the sound output for hours! I'm building a GameBoy Zero. I enabled the GPIO controller and tried to activate the PWM audio output.
              My GPIO18 is used by the Y button of the controller, so I changed the dtoverlay line to use the GPIO13.

              This is my current configuration:

              0_1488580279560_Screen Shot 2017-03-03 at 23.30.47.png

              I'm using earphones directly connected to the GND and GPIO13, but nothing sounds. I tried different combinations of pwm and pwm-2chan without results.

              My Recalbox version is 4.0.2

              Could you please give me some advice? Thanks!!!! 😄

              svartholm 1 Reply Last reply Reply Quote 0
              • svartholm
                svartholm last edited by

                This post is deleted!
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                • svartholm
                  svartholm @MartinCR last edited by

                  @MartinCR I have the exact same issue, no sound through gpio 13, neither with or without filter and amplifier.

                  I use "dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4"

                  Did you find out what was wrong

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                  • MartinCR
                    MartinCR @svartholm last edited by

                    @svartholm Hi guys!

                    yes, it's fixed, but I'm not sure about what's the solution. I think there's something broken in the 4.0.2 update. I read other thread in this forum about a similar problem with RPi3 and Recalbox 4.0.2. I decided to downgrade to the 4.0.0 version and disable the automatic updates and everything is working now!

                    Let me know if it works for you!

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                    • MartinCR
                      MartinCR @svartholm last edited by

                      @svartholm I changed my mind, I think the audio problem is present if you set the gpio and the pwm-2chan enabled at the same time. Everything was working until I decided to enable the gpio in the recalbox.conf file. Now I don't have sound 😞

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                      • MartinCR
                        MartinCR last edited by

                        Solved!
                        I was using a GPIO controller, but the PWM doesn't work with the default mapping configuration of Recalbox. The solution is to set controllers.gpio.args=map=1 in the recalbox.conf file.
                        Now the GPIO and the PWM Audio are working simultaneously.

                        My PWM config is:
                        dtoverlay=pwm,pin=13,func=4

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                        • sla89
                          sla89 last edited by

                          I was faced with the same problem with Recalbox 4.0.1.
                          I have the same configuration as the but there was no sound at all. I have downgraded to Recalbox 4.0.0 and applied the configuration again and everything works like a charm.

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