I.MX 8P Creates a USB Composite using HID Gadget and UAC Gadget fail.

[ZenJeams]

Hi NXP Team,

I try to create a USB Composite using the 1 HID Gadget ( hid.usb0) and 4 UAC Gadgets (uac2.usb0、uac2.usb1、uac2.usb2、uac2.usb3)  drivers already in  Real-time Edge Yocto Project. 

When I configured the fourth UAC Gadget, I found a prompt error.

Errors in log:

root@imx8mp-lpddr4-evk:~# sh usb_gadget.sh start
Start usb gadget
mkdir functions/hid.usb0
mkdir functions/uac2.usb0
mkdir functions/uac2.usb1
mkdir functions/uac2.usb2
mkdir functions/uac2.usb3
[ 893.821612] ep->claimed = 2
[ 893.821784] configfs-gadget gadget: in_epnum=0,out_epnum= 0
[ 893.821790] ep->claimed = 1
[ 893.821792] ep->claimed = 2
[ 893.821795] configfs-gadget gadget: in_epnum=0,out_epnum= 0
usb_gadget.sh: line 118: echo: wr[ 893.821798] ep->claimed = 1
ite error: No such device[ 893.821800] ep->claimed = 2
[ 893.821801] ep->claimed = 4

[ 893.822097] configfs-gadget gadget: in_epnum=0,out_epnum= 0
[ 893.822101] ep->claimed = 1
[ 893.822102] ep->claimed = 2
[ 893.822104] ep->claimed = 4
[ 893.822105] ep->claimed = 6
[ 893.822107] configfs-gadget gadget: in_epnum=0,out_epnum= 0
[ 893.822110] ep->claimed = 1
[ 893.822111] ep->claimed = 2
[ 893.822113] ep->claimed = 4
[ 893.822114] ep->claimed = 6
[ 893.822115] ep->claimed = 8
[ 893.822427] configfs-gadget gadget: in_epnum=0,out_epnum= 0
[ 893.822434] ep->claimed = 1
[ 893.822435] ep->claimed = 2
[ 893.822437] ep->claimed = 4
[ 893.822438] ep->claimed = 6
[ 893.822440] ep->claimed = 8
[ 893.822441] ep->claimed = 10
[ 893.822444] configfs-gadget gadget: in_epnum=0,out_epnum= 0
root@imx8mp-lpddr4-evk:~# [ 893.822447] ep->claimed = 1
[ 893.822448] ep->claimed = 2
[ 893.822450] ep->claimed = 4
[ 893.822451] ep->claimed = 6
[ 893.822452] ep->claimed = 8
[ 893.822453] ep->claimed = 10
[ 893.822455] ep->claimed = 12
[ 893.826713] configfs-gadget gadget: in_epnum=0,out_epnum= 0
[ 893.826725] ep->claimed = 1
[ 893.826727] ep->claimed = 2
[ 893.826729] ep->claimed = 4
[ 893.826730] ep->claimed = 6
[ 893.826732] ep->claimed = 8
[ 893.826733] ep->claimed = 10
[ 893.826735] ep->claimed = 12
[ 893.826737] ep->claimed = 14
[ 893.826739] configfs-gadget gadget: afunc_bind:1113 Error!
[ 893.828520] udc 38100000.usb: failed to start g1: -19

It is possible that the system does not have enough endpoints to allocate? What can I do to meet my project requirements?

[Rita_Wang]

Are you using NXP EVK board or the board you design yourself? Which version BSP are you using? Have you already run the proper steps?

[ZenJeams]

Using  NXP IMX8M Plus  LPDDR4 EVK with  Real-time Edge V2.5 Image.

Here is my config shell script:

#!/bin/sh

UDC_USB=$(ls /sys/class/udc)

do_start() {

    # Mount configfs

    # mount -t configfs none /sys/kernel/config

    mkdir -m 0770 /sys/kernel/config/usb_gadget/g1

    cd /sys/kernel/config/usb_gadget/g1

    # Setting English strings

    echo 0x0300 > bcdUSB

    echo 0x0101 > idProduct

    echo 0x17EF > idVendor

    # USB 1.1: 0x0110

    # USB 2.0: 0x0200, USB 2.1: 0x0210, USB 2.5: 0x0250

    # USB 3.0: 0x0300, USB 3.1: 0x0310, USB 3.2: 0x0320

    # echo 0x0210 > /sys/kernel/config/usb_gadget/g1/bcdUSB

    mkdir "strings/0x409"

    echo "0123456789ABCDEF" > "strings/0x409/serialnumber"

    echo "Lenovo" > "strings/0x409/manufacturer"

    echo "Intelligent Spkeaker" > "strings/0x409/product"

    echo "0xEF" > bDeviceClass

    echo "0x02" > bDeviceSubClass

    echo "0x01" > bDeviceProtocol

    mkdir "configs/c.1"

    echo 120 > "configs/c.1/MaxPower"

    mkdir "configs/c.1/strings/0x409"

    echo "Conf 1" > "configs/c.1/strings/0x409/configuration"

    # HID

    echo "mkdir functions/hid.usb0"

    mkdir functions/hid.usb0

    echo 1 > functions/hid.usb0/protocol

    echo 1 > functions/hid.usb0/subclass

    echo 8 > functions/hid.usb0/report_length

    cat /home/root/Audio/hid_report_desc > functions/hid.usb0/report_desc

    ln -s functions/hid.usb0 configs/c.1

    # uac2.usb0

    echo "mkdir functions/uac2.usb0"

    mkdir functions/uac2.usb0

    #Speaker

    echo 0 > functions/uac2.usb0/c_chmask

    echo 2 > functions/uac2.usb0/c_ssize

    echo 16000 > functions/uac2.usb0/c_srate

    #MIC

    echo 0x01> functions/uac2.usb0/p_chmask

    echo 2 > functions/uac2.usb0/p_ssize

    echo 16000 > functions/uac2.usb0/p_srate

    ln -s functions/uac2.usb0 configs/c.1

    # uac2.usb1

    echo "mkdir functions/uac2.usb1"

    mkdir functions/uac2.usb1

    ## Speaker

    echo 0 > functions/uac2.usb1/c_chmask

    echo 2 > functions/uac2.usb1/c_ssize

    echo 96000 > functions/uac2.usb1/c_srate

    ## MIC

    echo 0x01> functions/uac2.usb1/p_chmask

    echo 2 > functions/uac2.usb1/p_ssize

    echo 96000 > functions/uac2.usb1/p_srate

    ln -s functions/uac2.usb1 configs/c.1

    # uac2.usb2

    echo "mkdir functions/uac2.usb2"

    mkdir functions/uac2.usb2

    ## Speaker

    echo 0 > functions/uac2.usb2/c_chmask

    echo 2 > functions/uac2.usb2/c_ssize

    echo 16000 > functions/uac2.usb2/c_srate

    ## MIC

    echo 0x01  > functions/uac2.usb2/p_chmask

    echo 2   > functions/uac2.usb2/p_ssize

    echo 16000 > functions/uac2.usb2/p_srate

    ln -s functions/uac2.usb2 configs/c.1

    # uac2.usb3

    echo "mkdir functions/uac2.usb3"

    mkdir functions/uac2.usb3

    ## Speaker

    echo 0x01 > functions/uac2.usb3/c_chmask

    echo 2 > functions/uac2.usb3/c_ssize

    echo "adaptive" > functions/uac2.usb3/c_sync

    echo 48000 > functions/uac2.usb3/c_srate

    ## MIC

    echo 0   > functions/uac2.usb3/p_chmask

    echo 2   > functions/uac2.usb3/p_ssize

    echo 48000 > functions/uac2.usb3/p_srate

    ln -s functions/uac2.usb3 configs/c.1

    #Binding USB Device Controller

    echo "$UDC_USB" > UDC

}

do_stop() {

        cd /sys/kernel/config/usb_gadget/g1

        echo "" > UDC

        rm configs/c.1/hid.usb0

        rm configs/c.1/uac2.usb0

        rm configs/c.1/uac2.usb1

        rm configs/c.1/uac2.usb2

        rm configs/c.1/uac2.usb3

        #rm configs/c.1/acm.gs0

        #rm configs/c.1/mass_storage.0

        rmdir configs/c.1/strings/0x409

        rmdir configs/c.1/

        rmdir functions/hid.usb0/

        rmdir functions/uac2.usb0/

        rmdir functions/uac2.usb1/

        rmdir functions/uac2.usb2/

        rmdir functions/uac2.usb3/

        #rmdir functions/acm.gs0/

        #rmdir functions/mass_storage.0/

        rmdir strings/0x409

        cd ..

        rmdir g1/

}

case $1 in

    start)

        echo "Start usb gadget"

        do_start

        ;;

    stop)

        echo "Stop usb gadget"

        do_stop

        ;;

    *)

        echo "Usage: $0 (stop | start)"

        ;;

esac