I need help converting a piece of Java into python

Question

Following Java code creates a message I can write to an arduino serial port to control a robotic arm:

public static byte[] uArmMessage(short armRot, short armStr, short armHt, short handAng, boolean ctlData){
   byte[] msg ={(byte)0xFF,(byte)0xAA,(byte)((armRot>>8) 0xFF),
      (byte)(armRot&0xFF),(byte)((armStr>>8)&0xFF),
      (byte)(armStr&0xFF),(byte)((armHt>>8)&0xFF),
      (byte)(armHt&0xFF),(byte)((handAng>>8)&0xFF),
      (byte)(handAng&0xFF),(byte)(ctlData ? 1 : 2)};
   return msg;
}

I need help writing this function in python. If someone could explain to me how exactly i get the output from this function into an arduino I would also really appreciate it!

if it is any help I have a PDF that explains the Communication Protocol being used.

if this is not the place for this kind of question, could someone reefer me to somewhere more fitting?

Doesn't look simple to me. And SO isn't a code writing service. — Malik Brahimi, Jun 29 '15 at 18:28
You should have a look [here](https://stackoverflow.com/questions/8730927/convert-python-long-int-to-fixed-size-byte-array) — Cory Kramer, Jun 29 '15 at 18:30

Joran Beasley · Answer 1 · 2015-06-29T18:42:48.070

1

msg =[0xFF,0xAA,((armRot>>8)& 0xFF),
      (armRot&0xFF),((armStr>>8)&0xFF),
      (armStr&0xFF),((armHt>>8)&0xFF),
      (armHt&0xFF),((handAng>>8)&0xFF),
      (handAng&0xFF),(1 if ctlData else 2)];

s = serial.Serial("COM5",9600)
s.write("".join(map(chr,msg)))

basically it was just a matter of remove all the (Byte) and replaceing {} with [] ....

edited Jun 29 '15 at 18:42

answered Jun 29 '15 at 18:32

Joran Beasley

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I need help converting a piece of Java into python

1 Answers1