cdc串口如何配置

问题描述

/etc/init.d/S41adb_mtp脚本实现了开机的MTP和ADB实现，现在想加入cdc串口，做了如下修改 (用# * new标注了)：

#!/bin/sh
#set -x
#adb.exe device
#adb.exe shell
g1="/sys/kernel/config/usb_gadget/g1"
case "$1" in
  start)
    modprobe libcomposite
    modprobe usb_f_fs
    modprobe usb_f_acm     # *new add
    #modprobe usb_f_acm.ko  usb_f_rndis.ko

    test -d /sys/kernel/config || mkdir /sys/kernel/config
    mount -t configfs none /sys/kernel/config
    mkdir "${g1}" && cd "${g1}"


    echo 0x29F1 > idVendor  #canaan
    echo 0x0105 > idProduct
    echo 0x0100 > bcdDevice
    echo 0x0200 > bcdUSB

    mkdir strings/0x409
    echo 0123456789ABCDEF > strings/0x409/serialnumber
    echo "canaan" > strings/0x409/manufacturer
    echo "k_linux" > strings/0x409/product

    mkdir configs/c.1
    mkdir configs/c.1/strings/0x409
    echo "Conf 1" > configs/c.1/strings/0x409/configuration
    #echo 120 > configs/c.1/MaxPower


    mkdir -p ${g1}/functions/acm.usb0     # *new add
    ln -s ${g1}/functions/acm.usb0 ${g1}/configs/c.1/acm.usb0        # *new add
    # mkdir -p ${g1}'/functions/rndis.usb0'
    # ln -s ${g1}/functions/rndis.usb0 ${g1}/configs/c.1/rndis.usb0

    # mkdir -p ${g1}'/functions/acm.0'
    # ln -s ${g1}/functions/acm.0  ${g1}/configs/c.1/acm.0

    # *new add CDC and close MTP
    # mkdir -p ${g1}'/functions/ffs.mtp'
    # ln -s ${g1}/functions/ffs.mtp ${g1}/configs/c.1/ffs.mtp
    # mkdir -p  /dev/usb-ffs/mtp
    # mount -t functionfs mtp  /dev/usb-ffs/mtp


    mkdir -p ${g1}'/functions/ffs.adb'
    ln -s ${g1}/functions/ffs.adb ${g1}/configs/c.1/ffs.adb
    mkdir -p /dev/usb-ffs/adb
    mount -o uid=2000,gid=2000 -t functionfs adb /dev/usb-ffs/adb
    cd /root/ && adbd &
    
    # wait adbd functionfs ready
    sleep 3
    # umtprd &     # *new add close MTP
    # cd / && sleep 1 && echo "91500000.usb" > ${g1}/UDC &
    cd / && sleep 1 && echo "91500000.usb" > ${g1}/UDC # remove &
    ;;
  stop)
    # 1. 先停止进程
    killall adbd 2>/dev/null
    # killall umtprd 2>/dev/null# *new add close MTP

    # 2. 解绑 UDC（最先清理硬件绑定）
    if [ -e "${g1}/UDC" ]; then
      echo "" > "${g1}/UDC" 2>/dev/null
    fi

    # 3. 删除 function 链接
    rm -f "${g1}/configs/c.1/ffs.adb" 2>/dev/null
    # rm -f "${g1}/configs/c.1/ffs.mtp" 2>/dev/null     # *new add
    rm -f "${g1}/configs/c.1/acm.usb0"     # *new add
    
    # 4. 卸载 functionfs
    umount /dev/usb-ffs/adb 2>/dev/null
    # umount /dev/usb-ffs/mtp 2>/dev/null     # *new add

    # 5. 删除 function
    rmdir "${g1}/functions/ffs.adb" 2>/dev/null
    # rmdir "${g1}/functions/ffs.mtp" 2>/dev/null     # *new add
    rmdir "${g1}/functions/acm.usb0" 2>/dev/null     # *new add

    # 6. 删除 config/strings 目录
    rmdir "${g1}/configs/c.1/strings/0x409" 2>/dev/null
    rmdir "${g1}/configs/c.1" 2>/dev/null
    rmdir "${g1}/strings/0x409" 2>/dev/null

    # 7. 删除 gadget
    cd / && rmdir "${g1}" 2>/dev/null

    # 8. 等待 USB 连接完全断开
    sleep 1

    # 9. 卸载模块（先卸载功能模块，再卸载 composite）
    rmmod usb_f_acm 2>/dev/null     # *new add
    rmmod usb_f_fs 2>/dev/null
    rmmod libcomposite 2>/dev/null

    # 10. 卸载 configfs
    umount /sys/kernel/config 2>/dev/null

    echo "USB gadget stopped"
    ;;
  restart|reload|force-reload)
    echo "Error: argument '$1' not supported" >&2
    exit 3
    ;;
  *)
    echo "Usage: adbd start|stop" >&2
    exit 3
    ;;
esac

上电时win方能够识别到串口，串口助手也能打开，但是echo -e "hello\r\n" > /dev/ttyGS0不能发送数据，卡一会没有任何输出，热插拔后该串口也不再显示了

硬件板卡

庐山派

软件版本

CanMV-K230_LCKFB_linux_v1.1_nncase_v2.11.0_ed3b7dcf.img