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| #!/usr/bin/env python
# serial_port_loopback.py
# Will also work on Python3.
# Serial port testing for a RaspberryPi.
from __future__ import print_function
import serial
test_string = "Testing 1 2 3 4".encode('utf-8')
#test_string = b"Testing 1 2 3 4" ### Will also work
port_list = ["/dev/serial0", "/dev/ttyAMA0", "/dev/serial1", "/dev/ttyS0"]
for port in port_list:
try:
serialPort = serial.Serial(port, 9600, timeout = 2)
serialPort.flushInput()
serialPort.flushOutput()
print("Opened port", port, "for testing:")
bytes_sent = serialPort.write(test_string)
print ("Sent", bytes_sent, "bytes")
loopback = serialPort.read(bytes_sent)
if loopback == test_string:
print ("Received", len(loopback), "valid bytes, Serial port", port, "working \n")
else:
print ("Received incorrect data", loopback, "over Serial port", port, "loopback\n")
serialPort.close()
except IOError:
print ("Failed at", port, "\n") |
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