reading and logging binary data on serial port

[katesfb]

Hi,
I have a project to log raw binary GPS data (from a ublox GPS reciever) to a file for later post processing. The receiver puts out raw GPS data message packets (not the NMEA sentences - these have been disabled). The problem i am having is that when i read and log the data to a file the resulting binary file is not the same as the data that i read from. For example if read and log using a terminal program like "cutecom" it works fine so there is obviously something wrong with my code.

The following code simply reads a byte into an array and then logs it to a file as a test:

import serial
import time
import pickle

def setupSerial(GPSPort):
    ser = serial.Serial(port=GPSPort,baudrate=115200,bytesize=8,parity='N',stopbits=1,xonxoff=0,rtscts=0)
    print(ser)               #testing

    return ser

GPSPort="/dev/ttyUSB0"
ser = setupSerial(GPSPort)
newFileBytes=[]

for x in range(1000):
    y = ser.inWaiting()
    print(y)
    if y > 0:
        z=ser.read()
        print(z)
        newFileBytes.append(z)

with open("~/GPSBinTest.ubx","wb") as mypicklefile:
    pickle.dump(newFileBytes, mypicklefile)

Can anybody see what i am doing wrong here.

Any help is much appreciated.

Cheers.

[Larz60+]

how are you reading the data back in?
it should be like:

with open("~/GPSBinTest.ubx", 'rb') as fp:
    newdata = pickle.load(fp)

[katesfb]

Anybody......?

---

Hi,
Sorry Larz60+ i didnt see your reply so thanks.
Anyway i dont know quite what you mean, binary data isnt being loaded from the file it is coming from a GPS receiver connected to the serial port, the data is read into a byte array until 1000 bytes have been read (should it be 512 bytes?). Then it is dumped to a binary file. But the dumped file will not convert in RTKLib so something is wrong with the way i am logging the binary data to the file.

Any help you can give is much appreciated.

Cheers.