Config raspberry pi to communicated with serial port

Problem description

树莓派的串口原来已被占用，配置释放之后才能使用它来进行串口通信。

SerialPort of RP has already been used，need to release the serial port for other communication.

Solution

首先将 /boot/cmdline.txt里面的

First, find the line below in file “/boot/cmdline.txt”

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

.改成 .change to the line below

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

这样移除所有与ttyAMA0之间的关联

Then it releases the relation between ttyAMA0 and serial port.

之后进入文件 /etc/inittab In the end, fine file /etc/inittab

注释掉最后一句 Comment the line below:

#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100