zynq下usb gadget模拟网口、U盘、串口

usb gadget 十分好用，可以模拟成网口、U盘、串口等。本文主要讲述如何将 usb gadget 模拟成网口、U盘、串口。

平台

主控芯片 ： XC7Z020
内核版本 ：Linux zynq 4.14.0-xilinx

配置

所需配置模块在内核 Device Drivers → USB support → USB Gadget Support 下，使用 usb gadget 时，将 zynq 作为外围设备，为从。

配置成网口

#!/bin/sh

do_start() {
	insmod libcomposite.ko 
	insmod u_ether.ko 
	insmod usb_f_rndis.ko 
	
	mount -t configfs none /sys/kernel/config
	
	mkdir /sys/kernel/config/usb_gadget/g1
	cd /sys/kernel/config/usb_gadget/g1
	
	echo "0x1d6b" > idVendor
	echo "0x0104" > idProduct
	
	echo "0x200" > bcdUSB
	echo "0xEF" > bDeviceClass
	echo "0x02" > bDeviceSubClass
	echo "0x01" > bDeviceProtocol
	echo "0x0100" > bcdDevice
	
	mkdir -p strings/0x409
	echo "0" > strings/0x409/serialnumber
	echo `uname -r` > strings/0x409/manufacturer
	echo `hostname -s` > strings/0x409/product
	
	# Config
	mkdir configs/c.1
	mkdir -p configs/c.1/strings/0x409
	echo "Config 1: RNDIS" > configs/c.1/strings/0x409/configuration
	echo 250 > configs/c.1/MaxPower
	echo 0xC0 > configs/c.1/bmAttributes
	
	mkdir functions/rndis.0
	# Windows extension to force RNDIS config
	echo "1" > os_desc/use
	echo "0xbc" > os_desc/b_vendor_code
	echo "MSFT100" > os_desc/qw_sign
	
	mkdir -p /functions/rndis.0/os_desc/interface.rndis
	echo "RNDIS" > functions/rndis.0/os_desc/interface.rndis/compatible_id
	echo "5162001" > functions/rndis.0/os_desc/interface.rndis/sub_compatible_id
	
	# Set up the rndis device only first
	ln -s functions/rndis.0 configs/c.1
	ln -s configs/c.1 os_desc
	
	echo "ci_hdrc.0" > UDC
	
	ifconfig usb0 192.168.7.100
	ifconfig usb0 up
}

do_stop() {
	# 卸载usb网口
	cd /sys/kernel/config/usb_gadget/g1
	echo "" > UDC
	rm os_desc/c.1/
	rm configs/c.1/rndis.0/
	rmdir configs/c.1/strings/0x409/
	rmdir configs/c.1/
	rmdir functions/rndis.0/
	rmdir strings/0x409/
	cd ..
	rmdir g1/
	 
	rmmod u_ether.ko 
	rmmod usb_f_rndis.ko
	rmmod libcomposite.ko
}

case $1 in
    start)
        echo "Start usb gadget"
        do_start 
        ;;
    stop)
        echo "Stop usb gadget"
        do_stop
        ;;
    *)
        echo "Usage: $0 (stop | start)"
        ;;
esac

配置成U盘

#!/bin/sh

do_start() {
	insmod  libcomposite.ko
	insmod usb_f_mass_storage.ko
	dd bs=1M count=16 if=/dev/zero of=/tmp/lun0.img
	mount -t configfs none /sys/kernel/config
	mkdir /sys/kernel/config/usb_gadget/g1
	cd /sys/kernel/config/usb_gadget/g1
	echo "0x200" > bcdUSB
	echo "0x100" > bcdDevice
	echo "0x03FD" > idVendor
	echo "0x0500" > idProduct
	
	mkdir -p strings/0x409
	echo "0" > strings/0x409/serialnumber
	echo `uname -r` > strings/0x409/manufacturer
	echo `hostname -s` > strings/0x409/product
	
	mkdir -p  functions/mass_storage.0
	
	mkdir -p configs/c.1
	echo 120 > configs/c.1/MaxPower
	
	 mkdir -p   functions/mass_storage.0/lun.0
	echo /tmp/lun0.img > functions/mass_storage.0/lun.0/file
	echo 1 > functions/mass_storage.0/lun.0/removable
	ln -s functions/mass_storage.0 configs/c.1
	echo "ci_hdrc.0" > UDC
}

do_stop() {
	# 卸载USB  U盘
	cd /sys/kernel/config/usb_gadget/g1
	echo "" > UDC
	rm configs/c.1/mass_storage.0/
	rmdir configs/c.1/
	rmdir functions/mass_storage.0/
	rmdir strings/0x409/
	cd ..
	rmdir g1/
	
	rmmod usb_f_mass_storage.ko
	rmmod libcomposite.ko
}

case $1 in
    start)
        echo "Start usb gadget"
        do_start 
        ;;
    stop)
        echo "Stop usb gadget"
        do_stop
        ;;
    *)
        echo "Usage: $0 (stop | start)"
        ;;
esac

配置成串口

#!/bin/sh

do_start() {
	insmod libcomposite.ko
	insmod u_serial.ko
	insmod usb_f_serial.ko
	insmod usb_f_acm.ko 
	mount -t configfs none /sys/kernel/config
	mkdir /sys/kernel/config/usb_gadget/g1
	cd /sys/kernel/config/usb_gadget/g1
	echo "0x200" > bcdUSB
	echo "0x100" > bcdDevice
	echo "0x03FD" > idVendor
	echo "0x0500" > idProduct
	
	mkdir -p strings/0x409
	echo "0" > strings/0x409/serialnumber
	echo `uname -r` > strings/0x409/manufacturer
	echo `hostname -s` > strings/0x409/product
	
	mkdir -p functions/acm.gs0
	
	mkdir -p configs/c.1
	echo 120 > configs/c.1/MaxPower
	ln -s functions/acm.gs0 configs/c.1/
	echo "ci_hdrc.0" > UDC
}

do_stop() {
	# 卸载USB串口
	cd /sys/kernel/config/usb_gadget/g1
	echo "" > UDC
	rm configs/c.1/acm.gs0/
	rmdir configs/c.1/
	rmdir functions/acm.gs0/
	rmdir strings/0x409/
	cd ..
	rmdir g1/
	
	rmmod u_serial.ko
	rmmod usb_f_serial.ko
	rmmod usb_f_acm.ko 
	rmmod libcomposite.ko
}

case $1 in
    start)
        echo "Start usb gadget "
        do_start 
        ;;
    stop)
        echo "Stop usb gadget"
        do_stop
        ;;
    *)
        echo "Usage: $0 (stop | start)"
        ;;
esac

参考

https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt

https://github.com/STMicroelectronics/meta-st-openstlinux/blob/openstlinux-5.4-dunfell-mp1-20-06-24/recipes-bsp/tools/usbotg-gadget-config/stm32_usbotg_eth_config.sh

https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842272/Zynq+Linux+USB+Device+Driver