Raspberry Pi uses UART serial port and serial device communication

Raspberry Pi Hardware version:

Second-generation B +

Raspberry Pi System version

[Email protected] @raspberrypi: ~# Lsb_release-ano LSB modules is available. Distributor ID:RaspbianDescription:Raspbian Gnu/linux 8.0 (Jessie) Release:8.0codename:jessie

Modified files: vim/boot/cmdline.txt

Change it to the following [email protected]:~# cat/boot/cmdline.txtdwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype= Ext4 Elevator=deadline Fsck.repair=yes rootwait

Restart Raspberry Pi:

[Email protected]:~# reboot

Connect the Raspberry Pi serial port to the other serial devices.

Raspberry Pi Gnd-to-GND serial device

Raspberry Pi Txd---RXD serial device

Raspberry Pi Txd---RXD serial device

Use Pyserial[email protected]:~# apt-get install python-serial a character content "return " echo program, plus " return  "baud rate:9600[email protected]:~# vim python_serial.py# -*- coding:  utf-8 -*  import serial  import time  #  Open Serial   ser  = serial. Serial ("/dev/ttyama0",  9600)   def main ():      while  true:          #  get receive buffer characters            count = ser.inwaiting ()            if count != 0:               #  read content and Echo                recv = ser.read (count) + ".... return\n\n"           &Nbsp;   ser.write (recv)           #  Emptying the receive buffer           ser.flushinput ()            #  necessary software delay            Time.sleep (0.1)        if __name__ ==  ' __main__ ':       try:          main ()        except KeyboardInterrupt:           if ser != None:               ser.close ()   Run Program: [email protected]:~# python python_serial.py

Test diagram

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Raspberry Pi uses UART serial port and serial device communication