ubuntu 下使用串口工具(呕心沥血整理调试成功)
ubuntu 下使用串口工具
1.安装
sudo apt-get install minicom
2.查看所有串口
ls /dev/tty*
3.连接串口线，查看正在使用的串口。
grep tty
4.修改minicom配置。
sudo minicom -s
选择Serial port setup
这里重要的是以下几个选项：
A 设置使用哪个串口设备（因为一台电脑上的串口可能不止一个），注意这里输入的是ttyS0
E 设置波特率、数据位、奇偶校验位、停止位，这里依次是115200，8，N，1
F 这个选项的含义，在下不知，但是网上众多人都说此项必须选成no，否则可能不能通信
5.打开串口查看日志。
sudo minicom
6.dmesg | grep tty
ls /dev/tty*
[ 0.234657] printk: console [tty0] enabled
[ 1.085899] 00:01: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[ 5.663858] usb 1-6: pl2303 converter now attached to ttyUSB0
7.查看USB转串驱动
首先看自己的Ubuntu 版本是否自带了U转串驱动，倘若没有，这种方法对你的系统还不适用。执行命令#lsmod | grep usbserial，如果能打印出上边的信息，证明此版本的Ubuntu操作系统自带有U转串驱动（U转串芯片是PL2303）。
lsmod |grep usbserial
lsmod |grep usbserial
usbserial 49152 3 pl2303
lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 067: ID 413c:2113 Dell Computer Corp.
Bus 001 Device 040: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 001 Device 068: ID 1bcf:0053 Sunplus Innovation Technology Inc.
Bus 001 Device 002: ID 148f:7601 Ralink Technology, Corp. MT7601U Wireless Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
8.退出
按下ctrl-a x 或者ctrl-a q可以退出minicom
可能是当前用户没有root权限。
ubuntu12.04使用USB转串口时出现权限不够问题，如下
Unable to open serial port /dev/ttyUSB0
权限不够
解决办法：
通过增加udev规则来实现。步骤如下：
创建文件/etc/udev/rules.d/70-ttyusb.rules
在文件内增加一行
KERNEL=="ttyUSB[0-9]*", MODE="0666"
如果没有权限，执行
cd /etc/udev
sudo chmod 777 -R /udev
boe@boe-OptiPlex-5060:/etc/udev/rules.d$ dmesg | tail
[296995.945244] pl2303 ttyUSB0: error sending break = -19
[296995.945466] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
[296995.945636] pl2303 1-6:1.0: device disconnected
[297013.708243] usb 1-6: new full-speed USB device number 46 using xhci_hcd
[297013.861200] usb 1-6: New USB device found, idVendor=067b, idProduct=2303, bcdDevice= 3.00
[297013.861205] usb 1-6: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[297013.861208] usb 1-6: Product: USB-Serial Controller
[297013.861211] usb 1-6: Manufacturer: Prolific Technology Inc.
[297013.863788] pl2303 1-6:1.0: pl2303 converter detected
[297013.864673] usb 1-6: pl2303 converter now attached to ttyUSB0
连接成功的信息
boe@boe-OptiPlex-5060:~$ dmesg | tail
[ 420.459331] pl2303 1-6:1.0: pl2303 converter detected
[ 420.460374] usb 1-6: pl2303 converter now attached to ttyUSB0
[ 420.732315] usb 1-12: new low-speed USB device number 7 using xhci_hcd
[ 420.885943] usb 1-12: New USB device found, idVendor=1bcf, idProduct=0053, bcdDevice= 0.72
[ 420.885948] usb 1-12: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 420.885951] usb 1-12: Product: USB Optical Mouse
[ 420.892797] input: USB Optical Mouse Keyboard as /devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.0/0003:1BCF:0053.0004/input/input19
[ 420.952743] input: USB Optical Mouse Mouse as /devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.0/0003:1BCF:0053.0004/input/input20
[ 420.953088] input: USB Optical Mouse Consumer Control as /devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.0/0003:1BCF:0053.0004/input/input21
[ 420.953330] hid-generic 0003:1BCF:0053.0004: input,hidraw2: USB HID v1.10 Keyboard [USB Optical Mouse ] on usb-0000:00:14.0-12/input0