@fsergeys said in Changing the GPS frequency and configuring which NMEA sentences the gps posts.:
GALILEO and GALILEO Full satellites
Do you know what the difference between the two is? Also I wonder what is the default configuration for the tracking system?
I think the application note regardig I2c mentions to perform a dummy write after each command prior to get back to reading see my example here:
https://forum.pycom.io/topic/2442/pytrack-and-gps-balloon-mode/3
and the sequence chart in the application note:
http://www.quectel.com/UploadImage/Downlad/Quectel_L76-L_I2C_Application_Note_V1.0.pdf <- requires login.
and here is the code to perform checksum testing yourself:
requires the sentence to be a bytes object.
def _checksum(self, sentence):
l = sentence[0]
for c in sentence[1:]:
l = l ^ c
return l
def _test_checksum(self, sentence):
if self._checksum(sentence[1:-3]) == int(sentence[-2:], 16):
return True
return False
