七、荔枝派Nano USB转虚拟串口实现

柔情只为你懂 2024-04-19 16:26 68阅读 0赞

在文章开始,首先感谢一下 [https://whycan.cn][https_whycan.cn] 的晕哥的指导。除了本身荔枝派的坑之外，本人技术能力有限，在获得了其很多技术上面指导后才实现USB转虚拟串口及USB上的RNDIS的实现，所以非常感谢，顺便帮其推一下他的BBS  [https://whycan.cn][https_whycan.cn] 。

下面开始正式内容

一、配置Linux内核

make ARCH=arm menuconfig

如图所示

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70][]

二、编译内核及安装驱动

可以使用以下脚本文件

#! /bin/bash 
    ##编译内核
    make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -j8
    ##安装脚本驱动脚本
    rm -rf ./output
    ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- make modules_install INSTALL_MOD_PATH=`pwd`/output/

编译及安装结果如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 2][]

\*\*\*注意

在进行驱动安装的时候，会发现未能生成  modules.dep.bin, modules.dep 这两个文件，参考链接

[http://blog.chinaunix.net/uid-10386087-id-2959091.html][http_blog.chinaunix.net_uid-10386087-id-2959091.html]

![format_png][]

找到了原因：原来是编译环境没有 **depmod**命令文件

通过一下命令将编译环境安装软件即可

sudo apt-get install module-init-tools

三、打包并更新镜像到设备

再次附上我的打包脚本

#! /bin/bash 
    rm -rf ./output
    mkdir ./output
    cd ./output
     
    OUT_FILENAME="flashimg.bin"
     
    UBOOT_FILE=../u-boot/u-boot-sunxi-with-spl.bin
    KERNEL_DIR=../linux
    KERNEL_MODULES_DIR=$KERNEL_DIR/output/*
    DTB_FILE=$KERNEL_DIR/arch/arm/boot/dts/suniv-f1c100s-licheepi-nano.dtb
    KERNEL_FILE=$KERNEL_DIR/arch/arm/boot/zImage
    ROOTFS_FILE=../buildroot/output/images/rootfs.tar
    SPEC_FILE=./custom/*
    SCRIPTES=./scripts/*.sh
     
    dd if=/dev/zero of=$OUT_FILENAME bs=1M count=16
    dd if=$UBOOT_FILE of=$OUT_FILENAME bs=1K conv=notrunc
    dd if=$DTB_FILE of=$OUT_FILENAME bs=1K seek=1024  conv=notrunc
    dd if=$KERNEL_FILE of=$OUT_FILENAME bs=1K seek=1088  conv=notrunc
     
    mkdir rootfs
    tar xf $ROOTFS_FILE -C ./rootfs
     
    #cp -r $KERNEL_MODULES_DIR rootfs/target/ 
    cp -r $KERNEL_MODULES_DIR rootfs/usr/
    cp -r $SPEC_FILE rootfs/
     
    # add some custom modify
    #for f in $SCRIPTES; do
    #	ROOTFS_PATH=./rootfs bash "$f" -H
    #done
     
    fakeroot mkfs.jffs2 -s 0x100 -e 0x10000 --pad=0xAF0000 -r rootfs -o rootfs.img -D rootfs
    fakeroot mkfs.jffs2 -s 0x100 -e 0x10000 --pad=0x400000 -o jffs2.img -D overlay
     
    dd if=rootfs.img of=$OUT_FILENAME  bs=1K seek=5184  conv=notrunc
    dd if=jffs2.img of=$OUT_FILENAME bs=1M seek=12 conv=notrunc
     
    rm -rf rootfs rootfs.img jffs2.img

四、设备更新后重启

通过命令加载usb转串口驱动

modprobe g_serial

附上我的启动及加载驱动的log信息

U-Boot 2018.01-05679-g013ca45-dirty (Sep 14 2019 - 09:15:39 +0800) Allwinner Technology
    
    CPU:   Allwinner F Series (SUNIV)
    Model: Lichee Pi Nano
    DRAM:  32 MiB
    MMC:   SUNXI SD/MMC: 0
    SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB
    *** Warning - bad CRC, using default environment
    
    Setting up a 800x480 lcd console (overscan 0x0)
    In:    serial@1c25000
    Out:   serial@1c25000
    Err:   serial@1c25000
    Net:   No ethernet found.
    starting USB...
    No controllers found
    Hit any key to stop autoboot:  0
    SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB
    device 0 offset 0x100000, size 0x4000
    SF: 16384 bytes @ 0x100000 Read: OK
    device 0 offset 0x110000, size 0x400000
    SF: 4194304 bytes @ 0x110000 Read: OK
    ## Flattened Device Tree blob at 80c00000
       Booting using the fdt blob at 0x80c00000
       Loading Device Tree to 80e5f000, end 80e63f3e ... OK
    
    Starting kernel ...
    
    [    0.000000] Booting Linux on physical CPU 0x0
    [    0.000000] Linux version 4.15.0-rc8-licheepi-nano+ (root@dfd87b076607) (gcc version 7.2.1 20171011 (Linaro GCC 7.2-2017.11)) #10 Thu Sep 19 21:41:09 CST 2019
    [    0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
    [    0.000000] CPU: VIVT data cache, VIVT instruction cache
    [    0.000000] OF: fdt: Machine model: Lichee Pi Nano
    [    0.000000] Memory policy: Data cache writeback
    [    0.000000] random: fast init done
    [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 8128
    [    0.000000] Kernel command line: console=ttyS0,115200 panic=5 rootwait root=/dev/mtdblock3 rw rootfstype=jffs2
    [    0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
    [    0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
    [    0.000000] Memory: 22672K/32768K available (6144K kernel code, 240K rwdata, 1420K rodata, 1024K init, 246K bss, 10096K reserved, 0K cma-reserved, 0K highmem)
    [    0.000000] Virtual kernel memory layout:
    [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    [    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
    [    0.000000]     vmalloc : 0xc2800000 - 0xff800000   ( 976 MB)
    [    0.000000]     lowmem  : 0xc0000000 - 0xc2000000   (  32 MB)
    [    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
    [    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
    [    0.000000]       .text : 0x(ptrval) - 0x(ptrval)   (7136 kB)
    [    0.000000]       .init : 0x(ptrval) - 0x(ptrval)   (1024 kB)
    [    0.000000]       .data : 0x(ptrval) - 0x(ptrval)   ( 241 kB)
    [    0.000000]        .bss : 0x(ptrval) - 0x(ptrval)   ( 247 kB)
    [    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
    [    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
    [    0.000051] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
    [    0.000121] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
    [    0.000764] Console: colour dummy device 80x30
    [    0.000859] Calibrating delay loop... 203.16 BogoMIPS (lpj=1015808)
    [    0.070243] pid_max: default: 32768 minimum: 301
    [    0.070571] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
    [    0.070621] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
    [    0.072118] CPU: Testing write buffer coherency: ok
    [    0.073939] Setting up static identity map for 0x80100000 - 0x80100058
    [    0.076646] devtmpfs: initialized
    [    0.083516] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
    [    0.083593] futex hash table entries: 256 (order: -1, 3072 bytes)
    [    0.083880] pinctrl core: initialized pinctrl subsystem
    [    0.086135] NET: Registered protocol family 16
    [    0.087530] DMA: preallocated 256 KiB pool for atomic coherent allocations
    [    0.089467] cpuidle: using governor menu
    [    0.116649] SCSI subsystem initialized
    [    0.116999] usbcore: registered new interface driver usbfs
    [    0.117191] usbcore: registered new interface driver hub
    [    0.117412] usbcore: registered new device driver usb
    [    0.117881] pps_core: LinuxPPS API ver. 1 registered
    [    0.117909] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
    [    0.117983] PTP clock support registered
    [    0.118491] Advanced Linux Sound Architecture Driver Initialized.
    [    0.120137] clocksource: Switched to clocksource timer
    [    0.149319] NET: Registered protocol family 2
    [    0.151038] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
    [    0.151122] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
    [    0.151180] TCP: Hash tables configured (established 1024 bind 1024)
    [    0.151536] UDP hash table entries: 256 (order: 0, 4096 bytes)
    [    0.151602] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
    [    0.152124] NET: Registered protocol family 1
    [    0.153451] RPC: Registered named UNIX socket transport module.
    [    0.153492] RPC: Registered udp transport module.
    [    0.153508] RPC: Registered tcp transport module.
    [    0.153524] RPC: Registered tcp NFSv4.1 backchannel transport module.
    [    0.155823] NetWinder Floating Point Emulator V0.97 (double precision)
    [    0.157864] Initialise system trusted keyrings
    [    0.158461] workingset: timestamp_bits=30 max_order=13 bucket_order=0
    [    0.176767] NFS: Registering the id_resolver key type
    [    0.176855] Key type id_resolver registered
    [    0.176875] Key type id_legacy registered
    [    0.176998] jffs2: version 2.2. (NAND) (SUMMARY)  © 2001-2006 Red Hat, Inc.
    [    0.192747] Key type asymmetric registered
    [    0.192789] Asymmetric key parser 'x509' registered
    [    0.193016] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
    [    0.193051] io scheduler noop registered
    [    0.193069] io scheduler deadline registered
    [    0.193927] io scheduler cfq registered (default)
    [    0.193962] io scheduler mq-deadline registered
    [    0.193981] io scheduler kyber registered
    [    0.195157] sun4i-usb-phy 1c13400.phy: Couldn't request ID GPIO
    [    0.205354] suniv-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
    [    0.392536] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
    [    0.399726] console [ttyS0] disabled
    [    0.420008] 1c25000.serial: ttyS0 at MMIO 0x1c25000 (irq = 23, base_baud = 6250000) is a 16550A
    [    0.895013] console [ttyS0] enabled
    [    0.905808] panel-simple panel: panel supply power not found, using dummy regulator
    [    0.915365] SCSI Media Changer driver v0.25
    [    0.923594] m25p80 spi0.0: w25q128 (16384 Kbytes)
    [    0.928384] 4 ofpart partitions found on MTD device spi0.0
    [    0.933991] Creating 4 MTD partitions on "spi0.0":
    [    0.938806] 0x000000000000-0x000000100000 : "u-boot"
    [    0.946750] 0x000000100000-0x000000110000 : "dtb"
    [    0.954336] 0x000000110000-0x000000510000 : "kernel"
    [    0.962177] 0x000000510000-0x000001000000 : "rootfs"
    [    0.970638] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
    [    0.977178] ehci-platform: EHCI generic platform driver
    [    0.982805] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
    [    0.989036] ohci-platform: OHCI generic platform driver
    [    0.994794] usbcore: registered new interface driver usb-storage
    [    1.002050] i2c /dev entries driver
    [    1.060273] sunxi-mmc 1c0f000.mmc: base:0x15197b29 irq:19
    [    1.067921] usbcore: registered new interface driver usbhid
    [    1.073635] usbhid: USB HID core driver
    [    1.096444] NET: Registered protocol family 17
    [    1.101330] Key type dns_resolver registered
    [    1.108164] Loading compiled-in X.509 certificates
    [    1.124790] sun4i-drm display-engine: bound 1e60000.display-backend (ops 0xc0739e58)
    [    1.133736] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops 0xc073913c)
    [    1.141541] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
    [    1.148148] [drm] No driver support for vblank timestamp query.
    [    1.202352] Console: switching to colour frame buffer device 60x34
    [    1.225583] sun4i-drm display-engine: fb0:  frame buffer device
    [    1.232776] [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 0
    [    1.241942] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto supply vcc not found, using dummy regulator
    [    1.253805] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
    [    1.259636] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 1
    [    1.269777] hub 1-0:1.0: USB hub found
    [    1.273833] hub 1-0:1.0: 1 port detected
    [    1.280223] cfg80211: Loading compiled-in X.509 certificates for regulatory database
    [    1.297727] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
    [    1.304574] vcc3v3: disabling
    [    1.307556] ALSA device list:
    [    1.310596]   #0: Loopback 1
    [    1.314386] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
    [    1.323096] cfg80211: failed to load regulatory.db
    [    1.433256] random: crng init done
    [    3.584532] jffs2: notice: (1) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
    [    3.604606] VFS: Mounted root (jffs2 filesystem) on device 31:3.
    [    3.613302] devtmpfs: mounted
    [    3.621035] Freeing unused kernel memory: 1024K
    Starting syslogd: OK
    Starting klogd: OK
    Populating /dev using udev: [    9.620230] udevd[77]: starting version 3.2.7
    [    9.904435] udevd[77]: specified group 'kvm' unknown
    [   10.112047] udevd[78]: starting eudev-3.2.7
    done
    Initializing random number generator... done.
    Starting network: OK
    
    Welcome to Buildroot
    buildroot login: root
    Password:
    # modprobe g_serial
    [   39.439805] g_serial gadget: Gadget Serial v2.4
    [   39.444487] g_serial gadget: g_serial ready
    # [   39.847760] g_serial gadget: high-speed config #2: CDC ACM config
    [   39.853932] gs_console_connect: port num [0] is not support console

Win10端结果如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 3][]

\*\*\*注意 首次虚拟成功的时候，会发现没有USB转串口的驱动，需要通过 **zadig** 这个工具，将驱动安装上即可。

五、测试USB转虚拟串口

设备 -----> PC发送数据

echo "device send messge to PC" > /dev/ttyGS0

PC -----> 设备发送数据

1、在设备端先运行

cat /dev/ttyGS0

2、在PC端用串口工具发送消息 “ PC say hi to device!  ”

测试结果如下图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 4][]

六、将usb转串口作为console

1、开机增加加载usb转串口驱动

vi /etc/init.d/S10udev

通过vi编辑S10udev文件，并在文件中添加

modprobe g_serial

如图所示

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 5][]

2、在 /etc/inittab 文件中添加

ttyGS0::respawn:/bin/getty -L ttyGS0 57600 vt100

如图所示

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 6][]

保存后重启设备,待系统加驱动之后，就可以通过通过usb转串口登陆设备了。效果如下图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 7][]

以上的USB转串口的方法介绍到此。

再附上我的提问帖的地址 [https://whycan.cn/t\_2889.html][https_whycan.cn_t_2889.html]

最后，在此附上**zadig** 的下载地址

链接：[https://pan.baidu.com/s/1SDXyXqheE0KFSMX51y5fTg ][https_pan.baidu.com_s_1SDXyXqheE0KFSMX51y5fTg]  
提取码：i26h

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 8][]

[https_whycan.cn]: https://whycan.cn
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[http_blog.chinaunix.net_uid-10386087-id-2959091.html]: http://blog.chinaunix.net/uid-10386087-id-2959091.html
[format_png]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly93aHljYW4uY24vZmlsZXMvbWVtYmVycy8xNzQxL1FRMjAxOTA5MTgyMjI5MDkucG5n?x-oss-process=image/format,png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 5]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/3f650f46b3b74f93acd209d1a184e037.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 6]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/1f9877a180f544c0ad9033ce091b33c0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 7]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/f2639f5b8a9947a68bdac97724eb0d08.png
[https_whycan.cn_t_2889.html]: https://whycan.cn/t_2889.html
[https_pan.baidu.com_s_1SDXyXqheE0KFSMX51y5fTg]: https://pan.baidu.com/s/1SDXyXqheE0KFSMX51y5fTg%C2%A0
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjEyMDU3NjY2NA_size_16_color_FFFFFF_t_70 8]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/5595971d09c644d5935b4e71de480092.png