WirelessLink

一、安装CH340驱动
1.查看ubuntu系统自带的驱动

$ ls /lib/modules/$(uname -r)/kernel/drivers/usb/serial
aircable.ko cypress_m8.ko garmin_gps.ko iuu_phoenix.ko metro-usb.ko opticon.ko quatech2.ko ti_usb_3410_5052.ko visor.ko
ark3116.ko digi_acceleport.ko io_edgeport.ko keyspan.ko mos7720.ko option.ko safe_serial.ko upd78f0730.ko whiteheat.ko
belkin_sa.ko empeg.ko io_ti.ko keyspan_pda.ko mos7840.ko oti6858.ko sierra.ko usb_debug.ko wishbone-serial.ko
ch341.ko f81232.ko ipaq.ko kl5kusb105.ko mxuport.ko pl2303.ko spcp8x5.ko usbserial.ko xsens_mt.ko
cp210x.ko f81534.ko ipw.ko kobil_sct.ko navman.ko qcaux.ko ssu100.ko usb-serial-simple.ko
cyberjack.ko ftdi_sio.ko ir-usb.ko mct_u232.ko omninet.ko qcserial.ko symbolserial.ko usb_wwan.ko

可以看到含有ch341.ko文件，系统自带的版本比较老，删除掉：

$ cd /lib/modules/$(uname -r)/kernel/drivers/usb/serial
sudo rm -rf ch341.ko

2.下载驱动

链接：http://www.wch.cn/download/CH341SER_LINUX_ZIP.html

解压后得到以下3个文件：

ch34x.c Makefile  readme.txt

3.查询操作系统的发行编号

$ uname -r 

5.4.0-94-generic

https://elixir.bootlin.com/linux/v5.4.94/source/drivers/usb/serial/ch341.c

根据查询到的操作系统的发行编号，打开对应的版本，复制所有内容替换ch34x.c内容。

4.编译源程序
cd切换至下载的文件夹，make编译源码，生成ch34x.ko文件：

$ make
make -C /lib/modules/5.8.0-55-generic/build M=/home/jiki/Downloads/CH341SER_LINUX
make[1]: 进入目录“/usr/src/linux-headers-5.8.0-55-generic”
AR /home/jiki/Downloads/CH341SER_LINUX/built-in.a
CC [M] /home/jiki/Downloads/CH341SER_LINUX/ch34x.o
MODPOST /home/jiki/Downloads/CH341SER_LINUX/Module.symvers
CC [M] /home/jiki/Downloads/CH341SER_LINUX/ch34x.mod.o
LD [M] /home/jiki/Downloads/CH341SER_LINUX/ch34x.ko
make[1]: 离开目录“/usr/src/linux-headers-5.8.0-55-generic”

注：编译需要安装gcc与make。

5.复制ch34x.ko文件

复制ch34x.ko文件至系统默认驱动文件夹：sudo cp ch34x.ko /lib/modules/$(uname -r)/kernel/drivers/usb/serial

$ sudo cp ch34x.ko /lib/modules/$(uname -r)/kernel/drivers/usb/serial

$ ls /lib/modules/$(uname -r)/kernel/drivers/usb/serial

输入lsmod命令查看：

$ lsmod
Module Size Used by
ch34x 24576 0
usbserial 53248 1 ch34x
nls_iso8859_1 16384 2
nvidia_uvm 1019904 0
nvidia_drm 57344 13
nvidia_modeset 1228800 10 nvidia_drm

看到ch34x模块，至此ch34驱动安装完成，如果未看到，输入sudo depmod -a命令，重启一次电脑。

二、cutecom串口调试助手
1.安装cutecom串口调试助手
$ sudo apt install cutecom
2.测试
终端窗口输入命令启动cutecom

$ sudo cutecom

插入ch340设备，选择usb口，点击seting进行串口参数，再点击Open。