[Jython-users] Jython read/write serial port

[James K. <jwk...@gm...>]

I want to bring ASCII into WIN-10 running Jython 2.7 on a com port from my
Arduino. I send *Axxxx to the Arduino and it replies with -Axxxx. This code
works solid when tested with the Arduino IDE serial monitor.

Jim K.
Houston TX

Using Jython code (below) written in Netbeans IDE -- I send "*ATest/n" out
the port and get back the correct decimal values that represent the ASCII
table.

Question 1 -- I have to use the time.sleep(2.0) statements or the outStream
won't be sent. Why? & how to fix it correctly.

Question 2 -- I tried to use readline() but the compiler says it doesn't
exist.

Question 3 -- how do I properly convert the read() byte data to ASCII? &
how can I get the SIZE of inStream

///////////// code ///////////////////////////
import sys, socket, gnu.io
import gnu.io.RXTXPort as RXTX
import time

__author__ = "jwkel"
__date__ = "$Oct 20, 2020 3:16:32 PM$"

if __name__ == "__main__":
    print "Hello World"
    # Here's a listing to demonstrate serial port connection
    # with Jython and the RXTX module.
    # Much more needs to be done to make it a useful
    # program but it demonstrates the key points
    # to make a connection!
    # Hope this helps anyone just starting out on a similar project.

    # Graham

    #Jython.py Serial Port connection with RXTX
    print "inport"
    #Open port COM5
    portId=gnu.io.CommPortIdentifier.getPortIdentifier("COM5")
    serialPort=portId.open("Demo1",2000)        #(Name,delay)

    #Set port parameters

serialPort.setSerialPortParams(9600,RXTX.DATABITS_8,RXTX.STOPBITS_1,RXTX.PARITY_NONE)
    print "set port"
    #Open input & output streams
    outStream=serialPort.getOutputStream()
    inStream=serialPort.getInputStream()
    time.sleep(2.0)
    #Define some output and write it to the serial port
    toOutput="*ATest\n"
    outStream.write(toOutput)
    outStream.flush()
    time.sleep(2.0)

    s =''
    for num in range(7):
        s = inStream.read()
        print s
    #s = inStream.read()
    #print s

    #Close inStream, outStream before closing the port itself
    outStream.close()
    inStream.close()
    serialPort.close()
    print "end Hello World"

///////////////// Netbeans output window //////////////////
Hello World
inport
set port
45 (-) I added the ASCII chr for reference
65 (A)
84 (T)
101 (e)
115 (s)
116 (t)
10 (/n)
end Hello World