How does Raspberry pie communicate with Serial Devices using uart Serial Port
Raspberry pie how to use uart serial port to communicate with serial devices, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.
Raspberry pie hardware version: second generation B +
Raspberry pie system version
Root@raspberrypiroot@raspberrypi:~# lsb_release-aNo LSB modules are available.Distributor ID:RaspbianDescription:Raspbian GNU/Linux 8.0 (jessie) Release:8.0Codename:jessie
Modify the file: vim / boot/cmdline.txt
Change it to root@raspberrypi:~# cat / boot/cmdline.txtdwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait like this
Restart raspberry pie:
Root@raspberrypi:~# reboot
Connect the serial port of raspberry pie with other serial devices
Raspberry pie GND-- > GND serial port equipment
Raspberry pie TXD-- > RXD serial port equipment
Raspberry pie TXD-- > RXD serial port equipment
Use the pyserialroot@raspberrypi:~# apt-get install python-serial one-character content "return" echo program Add "return" baud rate: 9600root@raspberrypi:~# vim python_serial.py#-*-coding: utf-8-* import serial import time # Open serial port ser = serial.Serial ("/ dev/ttyAMA0" 9600) def main (): while True: # get the receive buffer character count = ser.inWaiting () if count! = 0: # read and echo recv = ser.read (count) + ".... return\ n\ n" ser.write (recv) # clear 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: root@raspberrypi:~# python python_serial.py test chart
This is the answer to the question about how raspberry pie uses the uart serial port to communicate with serial devices. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.
