PocketBeagle - Bela Mini - ALSA audio codec support

The Bela and BelaMini capes can be used with ALSA using the BB-BONE-AUDI-02 overlay. This requires:

• installing one of the images provided by beagleboard.org
• load the BB-BONE-AUDI-02 overlay, using whatever instructions they provide (this normally requires editing (carefully) the /boot/uEnv.txt file).

My post here explains how to do it on a BeagleBone Black. Hopefully it is not too different on a PocketBeagle.

Note that this way you will not have access to Bela's IDE and you will not be able to run Bela programs. You'd have to use "stock" software instead, and if you are writing some C++ code, you'll have to manually connect to ALSA. If you want to access Bela's analog ins and outs from C/C++, you can use the example code here.

you can have a look at dmesg and it will tell you why it failed. I suspect it's a matter of disabling some of the cape_universal pins. I can have a look tomorrow.

ksmith197 [ 1.139273] pinctrl-single 44e10800.pinmux: pin PIN100 already requested by ocp1_36_pinmux; cannot claim for 48038000.mcasp
[ 1.151531] pinctrl-single 44e10800.pinmux: pin-100 (48038000.mcasp) status -22
[ 1.159144] pinctrl-single 44e10800.pinmux: could not request pin 100 (PIN100) from group pinmux_bone_audio_cape_audio_pins on device pinctrl-single

this would be one of the issues, it's probably a matter of adding something like this to the BB-BONE-AUDI-02 overlay:

	fragment@0 {
		target = <&ocp>;
		__overlay__ {
			P2_09_pinmux { status = "disabled"; }; 
			P2_11_pinmux { status = "disabled"; }; 
			P2_26_pinmux { status = "disabled"; };
			P2_30_pinmux { status = "disabled"; };
			P2_32_pinmux { status = "disabled"; };
			P2_34_pinmux { status = "disabled"; };
			P1_05_pinmux { status = "disabled"; };
			P1_06_pinmux { status = "disabled"; };
			P1_08_pinmux { status = "disabled"; };
			P1_09_pinmux { status = "disabled"; };
			P1_10_pinmux { status = "disabled"; };
			P1_11_pinmux { status = "disabled"; };
			P1_12_pinmux { status = "disabled"; };
			P1_26_pinmux { status = "disabled"; };
			P1_28_pinmux { status = "disabled"; };
			P1_29_pinmux { status = "disabled"; };
			P1_33_pinmux { status = "disabled"; };
			P1_36_pinmux { status = "disabled"; };
			P9_25_pinmux { status = "disabled"; }; /* mcasp0_ahclkx */
			P9_28_pinmux { status = "disabled"; }; /* mcasp0_axr2 */
			P9_29_pinmux { status = "disabled"; }; /* mcasp0_fsx */
			P9_31_pinmux { status = "disabled"; }; /* mcasp0_ahclk */
			P9_30_pinmux { status = "disabled"; }; /* mcasp0_axr0 */
		};
	};

(or actually a subset thereof, the above are the ones set by the Bela cape overlay).

Great that it works for you and thanks for sharing your instructions.

giuliomoro Hello, as mentioned in the other thread, with the help of BB image maintaner Robert Nelson, we figured out that in order to get the codec recognized, disabled pinmux was:

                __overlay__ {
                        P1_29_pinmux { status = "disabled"; };
                        P1_33_pinmux { status = "disabled"; };
                        P1_36_pinmux { status = "disabled"; };
                        P2_02_pinmux { status = "disabled"; };
                        P2_30_pinmux { status = "disabled"; };
                        P2_32_pinmux { status = "disabled"; };
                };

However, my issues with voltage errors in dmesg still prevail. I'm gonna try the @ksmith197 's suggestion and try another dts.