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.:
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 ?