ubuntu 下使用串口工具
1.安裝
sudo apt-get install minicom
2.查看所有串口
ls /dev/tty*
3.連接串口線，查看正在使用的串口。
grep tty
4.修改minicom配置。
sudo minicom -s
選擇Serial port setup
這裏重要的是以下幾個選項：
A 設置使用哪個串口設備（因爲一臺電腦上的串口可能不止一個），注意這裏輸入的是ttyS0
E 設置波特率、數據位、奇偶校驗位、停止位，這裏依次是115200，8，N，1
F 這個選項的含義，在下不知，但是網上衆多人都說此項必須選成no，否則可能不能通信
5.打開串口查看日誌。
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轉串驅動
首先看自己的Ubuntu 版本是否自帶了U轉串驅動，倘若沒有，這種方法對你的系統還不適用。執行命令#lsmod | grep usbserial，如果能打印出上邊的信息，證明此版本的Ubuntu操作系統自帶有U轉串驅動（U轉串芯片是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
可能是當前用戶沒有root權限。
ubuntu12.04使用USB轉串口時出現權限不夠問題，如下
Unable to open serial port /dev/ttyUSB0
權限不夠
解決辦法：
通過增加udev規則來實現。步驟如下：
創建文件/etc/udev/rules.d/70-ttyusb.rules
在文件內增加一行
KERNEL=="ttyUSB[0-9]*", MODE="0666"
如果沒有權限，執行
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
連接成功的信息
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
