13.1 linux命令行查看控制串口（uart)全攻略

linux命令行查看控制串口（uart)全攻略

本文主要内容：
1 串口启动驱动打印
2 sys目录下的串口信息
3 proc目录下的串口信息
4 etc目录下的串口信息
5 dev目录下的串口信息
6 stty控制具体的串口
7 命令行控制串口读写
8 串口数据解析

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1 串口启动信息

root@am62xx-evm:~# dmesg | grep ttyS*
[    0.000000] Kernel command line: console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000 root=PARTUUID=c879998c-02 rw rootfstype=ext4 rootwait
[    1.137367] printk: console [ttyS2] disabled
[    1.141819] 2800000.serial: ttyS2 at MMIO 0x2800000 (irq = 27, base_baud = 3000000) is a 8250
[    1.150590] printk: console [ttyS2] enabled
[    2.752842] systemd[1]: Created slice system-getty.slice.
[    2.783395] systemd[1]: Created slice system-serial\x2dgetty.slice.

2 sys目录下的串口信息

root@am62xx-evm:~# ls /sys/class/tty/ -al
total 0
drwxr-xr-x  2 root root 0 Feb 24 04:5