Platform: Demo images, i.MX8MPlus EVK
Some customer need test ffs gadget function on i.MX8MPlus EVK.
Here is demo for ffs test, please connect EVK and Ubuntu PC before test.
Test script:
#!/bin/sh
# Setup the device (configfs)
modprobe libcomposite
mkdir -p config
mount none config -t configfs
cd config/usb_gadget/
mkdir g1
cd g1
echo 0x1fc9 >idVendor
echo 0x0146 >idProduct
mkdir strings/0x409
echo 12345 >strings/0x409/serialnumber
echo "Signal 11" >strings/0x409/manufacturer
echo "Test" >strings/0x409/product
mkdir configs/c.1
mkdir configs/c.1/strings/0x409
echo "Config1" >configs/c.1/strings/0x409/configuration
# Setup functionfs
mkdir functions/ffs.usb0
ln -s functions/ffs.usb0 configs/c.1
cd ../../../
mkdir -p ffs
mount usb0 ffs -t functionfs
cd ffs
ffs-test 64 & # from the Linux kernel, with mods!
sleep 3
cd ..
# Enable the USB device
echo 38100000.usb > config/usb_gadget/g1/UDC
EVK log
root@imx8mpevk:~# ./test2.sh
[ 17.859597] file system registered
ffs-test: dbg: ep0: writing descriptors (in v2 format)
ffs-test: dbg: ep0: writing strings
ffs-test: dbg: ep1: starting
ffs-test: dbg: ep2: starting
ffs-test: dbg: ep1: starts
ffs-test: dbg: ep0: starts
ffs-test: dbg: ep2: starts
Event BIND
Event ENABLE
Ubuntu PC log:
lzm@lzm-GL552VW:~$ lsusb -D /dev/bus/usb/001/008
Device: ID 1fc9:0146 NXP Semiconductors Test
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x1fc9 NXP Semiconductors
idProduct 0x0146
bcdDevice 6.01
iManufacturer 1 Signal 11
iProduct 2 Test
iSerial 3 12345
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0020
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 Config1
bmAttributes 0x80
(Bus Powered)
MaxPower 2mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 5 Source/Sink
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 1
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 0x0016
bNumDeviceCaps 2
USB 2.0 Extension Device Capability:
bLength 7
bDescriptorType 16
bDevCapabilityType 2
bmAttributes 0x0000010e
BESL Link Power Management (LPM) Supported
BESL value 256 us
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x00
wSpeedsSupported 0x000f
Device can operate at Low Speed (1Mbps)
Device can operate at Full Speed (12Mbps)
Device can operate at High Speed (480Mbps)
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 1
Lowest fully-functional device speed is Full Speed (12Mbps)
bU1DevExitLat 0 micro seconds
bU2DevExitLat 0 micro seconds
Device Status: 0x0001
Self Powered
