之前安过CentOS的驱动，这篇是ubuntu的
绿联PL2303串口驱动下载
绿联USB转DB9,RS232串口线,Windows驱动下载地址
下载后解压有个linux目录，驱动需要根据内核进目录自行编译
hello@hello-ThinkServer-TS80X:/root$ uname -r5.15.0-46-generic
可以看到ubuntu的版本是5.15，但是目前文件夹最大版本是5.4.89，所以死马当活马医，用这个试试
cd 5.4.89_ok/make all
编译报错
root@hello-ThinkServer-TS80X:~/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok# make allmake -C /lib/modules/5.13.0-30-generic/build M=/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok modulesmake[1]: 进入目录“/usr/src/linux-headers-5.13.0-30-generic”CC [M] /root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok/pl2303.o/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok/pl2303.c:1109:17: error: initialization of ‘void (*)(struct tty_struct *, struct serial_struct *)’ from incompatible pointer type ‘int (*)(struct tty_struct *, struct serial_struct *)’ [-Werror=incompatible-pointer-types]1109 | .get_serial = pl2303_get_serial,| ^~~~~~~~~~~~~~~~~/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok/pl2303.c:1109:17: note: (near initialization for ‘pl2303_device.get_serial’)/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok/pl2303.c:1122:18: error: initialization of ‘void (*)(struct usb_serial_port *)’ from incompatible pointer type ‘int (*)(struct usb_serial_port *)’ [-Werror=incompatible-pointer-types]1122 | .port_remove = pl2303_port_remove,| ^~~~~~~~~~~~~~~~~~/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok/pl2303.c:1122:18: note: (near initialization for ‘pl2303_device.port_remove’)/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok/pl2303.c:622:13: warning: ‘pl2303_enable_xonxoff’ defined but not used [-Wunused-function]622 | static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)| ^~~~~~~~~~~~~~~~~~~~~/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok/pl2303.c:258:12: warning: ‘pl2303_update_reg’ defined but not used [-Wunused-function]258 | static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)| ^~~~~~~~~~~~~~~~~cc1: some warnings being treated as errorsmake[2]: *** [scripts/Makefile.build:281：/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok/pl2303.o] 错误 1make[1]: *** [Makefile:1879：/root/PL2303芯片驱动3.7/PL2303芯片驱动3.7/Linux/PL2303G_Linux_Driver_v1.0.6/5.4.89_ok] 错误 2make[1]: 离开目录“/usr/src/linux-headers-5.13.0-30-generic”make: *** [Makefile:4：all] 错误 2
报错主要有两处，是类型不匹配
第一个报错
pl2303.c:1109:17: error: initialization of ‘void (*)(struct tty_struct *, struct serial_struct *)’ from incompatible pointer type ‘int (*)(struct tty_struct *, struct serial_struct *)’ [-Werror=incompatible-pointer-types]
类型不兼容，改类型
修改914行
static int pl2303_get_serial(struct tty_struct *tty,
改成
static void pl2303_get_serial(struct tty_struct *tty,
第二个报错同理
pl2303.c:1122:18: error: initialization of ‘void (*)(struct usb_serial_port *)’ from incompatible pointer type ‘int (*)(struct usb_serial_port *)’ [-Werror=incompatible-pointer-types]
也是类型不兼容
修改433行
static int pl2303_port_remove(struct usb_serial_port *port)
改成
static void pl2303_port_remove(struct usb_serial_port *port)
重新用make all编译
有两个 return 0的报错
pl2303.c:439:9: error: ‘return’ with a value, in function returning void [-Werror=return-type]439 | return 0;pl2303.c:923:9: error: ‘return’ with a value, in function returning void [-Werror=return-type]923 | return 0;
将两个return 0;改成return;即可
重新用make all编译成功
拷贝编译模块
sudo cp pl2303.ko /lib/modules/$(uname -r)/kernel/drivers/usb/serial
编辑/etc/modules文件添加驱动名pl2303
sudo nano /etc/modules#添加内容pl2303#保存
最后重启
reboot
重启之后可以使用了
那么怎么判断usb串口驱动是否正常呢？
1.判断是否有/dev/ttyUSB* 设备 这个不能作为判断标准，接入usb设备后就能查到这个设备
2.判断dmesg | grep tty 是否输出usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0 这个也不能作为判断标准，接入usb后也会有这个
3.stty -F 测试收发 这个能作为判断标准
4.minicom程序测试收发 这个能作为判断标准
