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CR300 GPS Communication problem

Nicolas Jun 12, 2021 03:39 PM


I'm trying to establish communication between a CR300 (new and last OS update) and a GPS (NMEA 0183 V3.01: GGA, GSA, GSV, RMC, VTG - 9600 bps) with this simple code.:


   Scan (1,Sec,0,0)     

   GPS (latitude_a,COMC1_RX,C2,LOCAL_TIME_OFFSET*3600,100,nmea_sentence(1),9600)    

As you can imagine, it doesn't work (tested with or without a PPS signal), I get NAN for all the frames coming from the GPS.

On the oscilloscope, I have a PPS signal of 3.3 V at 1 Hz as well as the data frame from the GPS (@ 5V). The data frame is approximately 910ms (always less than 1000ms).

The PPS parameter always return approx. 550 ms (that it is transmitted on C2, SE1, ...)), i don't understand.

On the terminal (7: COM RX), I have no data

I don't know what to test anymore. Please, do you have an idea ?

Thank you,


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