This is my first attempt at understanding how serial communication on pi work, so I am testing this code:
''' UART communication on Raspberry Pi using Pyhton http://www.electronicwings.com ''' import serial from time import sleep ser = serial.Serial ("/dev/ttyS0", 115200) #Open port with baud rate while True: received_data = ser.read() #read serial port sleep(0.03) data_left = ser.inWaiting() #check for remaining byte received_data += ser.read(data_left) print (received_data) #print received data ser.write(received_data) #transmit data serially
I connected my pi ( pi 3) via usb-ttl converter to my PC ( windows). On windows I started putty and on pi I executed the above code.
It works but only in one direction. That is I can send any data from PC to the pi, but whatever I am typing on pi is not at all appearing on PC (putty). What can be done to make this duplex communication possible? (Note: I can send serial data both ways via putty, so I understand there is no issue with serial hardware)
ls -l /dev/ttys0 crw-rw---- 1 root dialout 4, 64 Mar 7 23:14 /dev/ttyS0 stty </dev/ttyS0 stty: 'standard input': Input/output error stty -F /dev/ttyS0 -a stty: : /dev/ttyS0 Input/output error