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Sending commands to PIC using Pyserial

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Hello all,

I am attempting to send commands to the firmware on my PIC18F4550 (usb port) microcontroller using Pyserial. If I open Hyperterminal, I can send the following commands and it works beautifully:

set_dac(0,1500, 0)

Then I went to Python with Pyserial, and nothing happens. I get no errors, but at the same time the board does not respond to the input, and python prints no output.

Here is my code:

import serial

ser = serial.Serial(7 )
ser.timeout = 2
ser.write('set_ dac(0,1500,0)\r report_smu(1)\r ')
reply = ser.read(7)
print reply

7 = COM8
The timeout I put in just so that it wouldn't sit there forever. I should be reading something in this time.
I only included \r because this is all the firmware looks for. But just for trial and error sake, I tried \n , \n\r , and \r\n just to be sure.

The electronics on the board do not matter -- as I said, it works with Hyperterminal. There seems to be an issue with my code.

I receive no errors when I execute my code, either.

I appreciate any insight to this problem whatsoever! :)

Mar 20 '08 #1
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