Hello. I am following the below post and trying to play audio on PCM5102A I2S board, connected to PocketBeagle header.
https://e2e.ti.com/support/processors/f/791/t/458085?Suggestion-for-improving-the-Sitara-Linux-Audio-DAC-Example I am using the official Debian image (with PCM5102A driver eneabled). So far (according to dmesg output) the drivers are initialized and newly created ALSA output device can be seen. >[ 1.553224] asoc-simple-card sound: ASoC: binding davinci-mcasp.0-pcm5102a-hifi >[ 1.662191] asoc-simple-card sound: pcm5102a-hifi 48038000.mcasp mapping ok >[ 1.666676] asoc-simple-card sound: ASoC: no DMI vendor name! >[ 1.697221] ALSA device list: >[ 1.697236] #0: I2S slave playback The problem is, trying 'aplay', but no sound on I2S device. The header pins are listed as follows in dtb. 0x190 0x8 /* P1.36 mcasp0_aclkx */ 0x194 0x8 /* P1.33 mcasp0_fsx */ 0x198 0x8 /* P2.32 mcasp0_axr0 */ I examined the pins with osilloscope, but I think there is no signal there. (Looks like P1.36 left open, P1.33, P2.32 pulled down to GND without signal?) I think there are at least two points I should look into next, but I am not sure how to. 1) mcasp0 driver is it working? 2) pinmux functioning so that I am seeing mcasp pins on P1.36/P1.33/P2.34 physical pins? Sorry I am new to pinmuxing. Maybe looking into some debugfs files I can be sure my pinmux definitions are working as expected? FYI. Here are lines containing mcasp from debugfs: /sys/kernel/debug/pinctrl/pinctrl_handles: >device: 48038000.mcasp current state: default > state: default > type: MUX_GROUP controller pinctrl-single group: mcasp0_pins (313) function: mcasp0_pins (313) /sys/kernel/debug/pinctrl/pinctrl-maps >device 48038000.mcasp >state default >type MUX_GROUP (2) >controlling device 44e10800.pinmux >group mcasp0_pins >function mcasp0_pins /sys/kernel/debug/pinctrl/44e10800.pinmux/pingroups: >group: mcasp0_pins >pin 100 (PIN100) >pin 101 (PIN101) >pin 102 (PIN102) /sys/kernel/debug/pinctrl/44e10800.pinmux/pinmux-functions: >function: mcasp0_pins, groups = [ mcasp0_pins ] /sys/kernel/debug/pinctrl/44e10800.pinmux/pinmux-pins: >pin 100 (PIN100): 48038000.mcasp (GPIO UNCLAIMED) function mcasp0_pins group mcasp0_pins >pin 101 (PIN101): 48038000.mcasp (GPIO UNCLAIMED) function mcasp0_pins group mcasp0_pins >pin 102 (PIN102): 48038000.mcasp (GPIO UNCLAIMED) function mcasp0_pins group mcasp0_pins -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/0d6f5674-57ae-448a-9cd4-8bb8327e0ab3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
