I am unable to get the I2S signals from the beaglebone. Below are the things I did.
1. I first disabled the HDMI audio as described here <https://github.com/beagleboard/linux/issues/101>. 2. I am using the P9.31 (SCLK), P9.28 (Data0) and P9.29(FSX/WS). Running sudo /opt/scripts/tools/version.sh gives the following. debian@beaglebone:/boot$ sudo /opt/scripts/tools/version.sh [sudo] password for debian: git:/opt/scripts/:[1aa73453b2c980b75e31e83dab7dd8b6696f10c7] eeprom:[A335BNLT00C02315BBBK4ACD] model:[TI_AM335x_BeagleBone_Black] dogtag:[BeagleBoard.org Debian Image 2018-10-07] bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2018.09-00002-g0b54a51eee]:[location: dd MBR] kernel:[4.14.71-ti-r80] nodejs:[v6.14.4] uboot_overlay_options:[enable_uboot_overlays=1] uboot_overlay_options:[uboot_overlay_addr0=/lib/firmware/BB-BONE-AUDI-02.dtbo] uboot_overlay_options:[disable_uboot_overlay_audio=1] uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo] uboot_overlay_options:[enable_uboot_cape_universal=1] pkg check: to individually upgrade run: [sudo apt install --only-upgrade <pkg>] pkg:[bb-cape-overlays]:[4.4.20180928.0-0rcnee0~stretch+20180928] pkg:[bb-wl18xx-firmware]:[1.20180517-0rcnee0~stretch+20180517] pkg:[kmod]:[23-2rcnee1~stretch+20171005] pkg:[librobotcontrol]:[1.0.3-git20181005.0-0rcnee0~stretch+20181005] pkg:[firmware-ti-connectivity]:[20170823-1rcnee1~stretch+20180328] groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal i2c bluetooth netdev cloud9ide gpio pwm eqep admin spi tisdk weston-launch xenomai] cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet] dmesg | grep pinctrl-single [ 1.107553] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568 dmesg | grep gpio-of-helper [ 1.119437] gpio-of-helper ocp:cape-universal: ready END 1. Running perl /opt/scripts/device/bone/show-pins.pl gives the following. debian@beaglebone:/boot$ perl /opt/scripts/device/bone/show-pins.pl P8.25 / eMMC d0 0 U7 fast rx up 1 mmc 1 d0 mmc@481d8000 (pinmux_emmc_pins) P8.24 / eMMC d1 1 V7 fast rx up 1 mmc 1 d1 mmc@481d8000 (pinmux_emmc_pins) P8.05 / eMMC d2 2 R8 fast rx up 1 mmc 1 d2 mmc@481d8000 (pinmux_emmc_pins) P8.06 / eMMC d3 3 T8 fast rx up 1 mmc 1 d3 mmc@481d8000 (pinmux_emmc_pins) P8.23 / eMMC d4 4 U8 fast rx up 1 mmc 1 d4 mmc@481d8000 (pinmux_emmc_pins) P8.22 / eMMC d5 5 V8 fast rx up 1 mmc 1 d5 mmc@481d8000 (pinmux_emmc_pins) P8.03 / eMMC d6 6 R9 fast rx up 1 mmc 1 d6 mmc@481d8000 (pinmux_emmc_pins) P8.04 / eMMC d7 7 T9 fast rx up 1 mmc 1 d7 mmc@481d8000 (pinmux_emmc_pins) P8.19 8 U10 fast rx down 7 gpio 0.22 ocp/P8_19_pinmux (pinmux_P8_19_default_pin) P8.13 9 T10 fast rx down 7 gpio 0.23 ocp/P8_13_pinmux (pinmux_P8_13_default_pin) P8.14 10 T11 fast rx down 7 gpio 0.26 ocp/P8_14_pinmux (pinmux_P8_14_default_pin) P8.17 11 U12 fast rx down 7 gpio 0.27 ocp/P8_17_pinmux (pinmux_P8_17_default_pin) P8.12 12 T12 fast rx down 7 gpio 1.12 ocp/P8_12_pinmux (pinmux_P8_12_default_pin) P8.11 13 R12 fast rx down 7 gpio 1.13 ocp/P8_11_pinmux (pinmux_P8_11_default_pin) P8.16 14 V13 fast rx down 7 gpio 1.14 ocp/P8_16_pinmux (pinmux_P8_16_default_pin) P8.15 15 U13 fast rx down 7 gpio 1.15 ocp/P8_15_pinmux (pinmux_P8_15_default_pin) P9.15 16 R13 fast rx down 7 gpio 1.16 ocp/P9_15_pinmux (pinmux_P9_15_default_pin) P9.23 17 V14 fast rx down 7 gpio 1.17 ocp/P9_23_pinmux (pinmux_P9_23_default_pin) P9.14 18 U14 fast rx down 7 gpio 1.18 ocp/P9_14_pinmux (pinmux_P9_14_default_pin) P9.16 19 T14 fast rx down 7 gpio 1.19 ocp/P9_16_pinmux (pinmux_P9_16_default_pin) P9.11 28 T17 fast rx down 7 gpio 0.30 ocp/P9_11_pinmux (pinmux_P9_11_default_pin) P9.13 29 U17 fast rx down 7 gpio 0.31 ocp/P9_13_pinmux (pinmux_P9_13_default_pin) P9.12 30 U18 fast rx down 7 gpio 1.28 ocp/P9_12_pinmux (pinmux_P9_12_default_pin) P8.26 31 V6 fast rx down 7 gpio 1.29 ocp/P8_26_pinmux (pinmux_P8_26_default_pin) P8.21 / eMMC clk 32 U9 fast rx up 2 mmc 1 clk mmc@481d8000 (pinmux_emmc_pins) P8.20 / eMMC cmd 33 V9 fast rx up 2 mmc 1 cmd mmc@481d8000 (pinmux_emmc_pins) P9.15 34 T13 fast rx up 7 gpio 2.00 P8.18 35 V12 fast rx down 7 gpio 2.01 ocp/P8_18_pinmux (pinmux_P8_18_default_pin) P8.07 36 R7 fast rx down 7 gpio 2.02 ocp/P8_07_pinmux (pinmux_P8_07_default_pin) P8.08 37 T7 fast rx down 7 gpio 2.03 ocp/P8_08_pinmux (pinmux_P8_08_default_pin) P8.10 38 U6 fast rx down 7 gpio 2.04 ocp/P8_10_pinmux (pinmux_P8_10_default_pin) P8.09 39 T6 fast rx down 7 gpio 2.05 ocp/P8_09_pinmux (pinmux_P8_09_default_pin) P8.45 / hdmi / sysboot 0 40 R1 fast 0 lcd d0 0-0070 (nxp_hdmi_bonelt_pins) P8.46 / hdmi / sysboot 1 41 R2 fast 0 lcd d1 0-0070 (nxp_hdmi_bonelt_pins) P8.43 / hdmi / sysboot 2 42 R3 fast 0 lcd d2 0-0070 (nxp_hdmi_bonelt_pins) P8.44 / hdmi / sysboot 3 43 R4 fast 0 lcd d3 0-0070 (nxp_hdmi_bonelt_pins) P8.41 / hdmi / sysboot 4 44 T1 fast 0 lcd d4 0-0070 (nxp_hdmi_bonelt_pins) P8.42 / hdmi / sysboot 5 45 T2 fast 0 lcd d5 0-0070 (nxp_hdmi_bonelt_pins) P8.39 / hdmi / sysboot 6 46 T3 fast 0 lcd d6 0-0070 (nxp_hdmi_bonelt_pins) P8.40 / hdmi / sysboot 7 47 T4 fast 0 lcd d7 0-0070 (nxp_hdmi_bonelt_pins) P8.37 / hdmi / sysboot 8 48 U1 fast 0 lcd d8 0-0070 (nxp_hdmi_bonelt_pins) P8.38 / hdmi / sysboot 9 49 U2 fast 0 lcd d9 0-0070 (nxp_hdmi_bonelt_pins) P8.36 / hdmi / sysboot 10 50 U3 fast 0 lcd d10 0-0070 (nxp_hdmi_bonelt_pins) P8.34 / hdmi / sysboot 11 51 U4 fast 0 lcd d11 0-0070 (nxp_hdmi_bonelt_pins) P8.35 / hdmi / sysboot 12 52 V2 fast 0 lcd d12 0-0070 (nxp_hdmi_bonelt_pins) P8.33 / hdmi / sysboot 13 53 V3 fast 0 lcd d13 0-0070 (nxp_hdmi_bonelt_pins) P8.31 / hdmi / sysboot 14 54 V4 fast 0 lcd d14 0-0070 (nxp_hdmi_bonelt_pins) P8.32 / hdmi / sysboot 15 55 T5 fast 0 lcd d15 0-0070 (nxp_hdmi_bonelt_pins) P8.27 / hdmi 56 U5 fast down 0 lcd vsync 0-0070 (nxp_hdmi_bonelt_pins) P8.29 / hdmi 57 R5 fast down 0 lcd hsync 0-0070 (nxp_hdmi_bonelt_pins) P8.28 / hdmi 58 V5 fast down 0 lcd pclk 0-0070 (nxp_hdmi_bonelt_pins) P8.30 / hdmi 59 R6 fast down 0 lcd oe/acb 0-0070 (nxp_hdmi_bonelt_pins) P9.22 / spi boot clk 84 A17 fast rx down 7 gpio 0.02 ocp/P9_22_pinmux (pinmux_P9_22_default_pin) P9.21 / spi boot in 85 B17 fast rx down 7 gpio 0.03 ocp/P9_21_pinmux (pinmux_P9_21_default_pin) P9.18 / spi boot out 86 B16 fast rx down 7 gpio 0.04 ocp/P9_18_pinmux (pinmux_P9_18_default_pin) P9.17 / spi boot cs 87 A16 fast rx down 7 gpio 0.05 ocp/P9_17_pinmux (pinmux_P9_17_default_pin) P9.42a 89 C18 fast rx down 7 gpio 0.07 ocp/P9_42_pinmux (pinmux_P9_42_default_pin) P9.20 / cape i²c sda 94 D18 fast rx up 3 i²c 2 sda ocp/P9_20_pinmux (pinmux_P9_20_default_pin) P9.19 / cape i²c scl 95 D17 fast rx up 3 i²c 2 scl ocp/P9_19_pinmux (pinmux_P9_19_default_pin) P9.26 96 D16 fast rx down 7 gpio 0.14 ocp/P9_26_pinmux (pinmux_P9_26_default_pin) P9.24 97 D15 fast rx down 7 gpio 0.15 ocp/P9_24_pinmux (pinmux_P9_24_default_pin) P9.31 / hdmi audio clk 100 A13 fast rx down 7 gpio 3.14 ocp/P9_31_pinmux (pinmux_P9_31_default_pin) P9.29 / hdmi audio fs 101 B13 fast rx down 7 gpio 3.15 ocp/P9_29_pinmux (pinmux_P9_29_default_pin) P9.30 102 D12 fast rx down 7 gpio 3.16 ocp/P9_30_pinmux (pinmux_P9_30_default_pin) P9.28 / hdmi audio data 103 C12 fast rx down 7 gpio 3.17 ocp/P9_28_pinmux (pinmux_P9_28_default_pin) P9.42b 104 B12 fast rx down 7 gpio 3.18 ocp/P9_92_pinmux (pinmux_P9_92_default_pin) P9.27 105 C13 fast rx down 7 gpio 3.19 ocp/P9_27_pinmux (pinmux_P9_27_default_pin) P9.41 106 D13 fast rx down 7 gpio 3.20 ocp/P9_91_pinmux (pinmux_P9_91_default_pin) P9.25 / audio osc 107 A14 fast rx down 7 gpio 3.21 ocp/P9_25_pinmux (pinmux_P9_25_default_pin) P9.41 / jtag emu3 109 D14 fast rx down 7 gpio 0.20 ocp/P9_41_pinmux (pinmux_P9_41_default_pin) 1. I have hooked my beaglebone's i2s signals to a logic analyzer and use aplay to play a .wav file as shown below. debian@beaglebone:~/UnoExampleTracks$ aplay 001_Sweeper.wav When I try playing the track, I get the following errors and no signals on the i2s bus: debian@beaglebone:~/UnoExampleTracks$ aplay 001_Sweeper.wav ALSA lib confmisc.c:767:(parse_card) cannot find card '0' ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1246:(snd_func_refer) error evaluating name ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default aplay: main:788: audio open error: No such file or directory Below is the kernel version I am using: debian@beaglebone:~/UnoExampleTracks$ uname -a Linux beaglebone 4.14.71-ti-r80 #1 SMP PREEMPT Fri Oct 5 23:50:11 UTC 2018 armv7l GNU/Linux Also, when I run aplay -l, I get the following: debian@beaglebone:~/UnoExampleTracks$ aplay -l aplay: device_list:270: no soundcards found... My intent is to connect a pcm5102 DAC module to the i2s lines and go from there. Before moving to the pcm5102, I decided it would be a good idea to first get the i2s bus up and running. Could someone please provide insights o what I may be doing wrong. -- 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/76a210cd-bb53-451f-8234-1cb3ebaa87e1%40googlegroups.com.
