My target Platform is IMX7 and IMXRT1050, both adapted Buildroot, it works very well but audio function is always failed using PDM microphone, it seems very strange when I search no any post or project, it's a good cost down way but why no anyone to do it?
I adapted simple-audio-card driver as following setting:
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "OnboardIM69D130";
simple-audio-card,format = "pdm";
simple-audio-card,bitclock-master = <&cpu_dai>;
simple-audio-card,frame-master = <&cpu_dai>;
simple-audio-card,widgets =
"Microphone", "Mic Jack";
simple-audio-card,routing =
"MIC_IN", "Mic Jack";
cpu_dai: simple-audio-card,cpu {
sound-dai = <&sai1>;
system-clock-frequency = <2400000>;
dai-tdm-slot-num = <1>;
dai-tdm-slot-width = <16>;
};
simple-audio-card,codec {
sound-dai = <&dummy_codec>;
};
};
and dmesg has no error but also no generate any ALSA devices, please someone can give me directions, thanks!
Wig
