Two serial connexions on Intel Galileo Gen 1

Projects Networking, Protocols, and Devices
1

Hello folks :wink:

I'm the happy owner of an Intel Galileo Gen 1 board, and I wan't to begin with an easy example : redirect datas from GPS (NMEA frames received in UART in the RX/TX pins of my board) to the serial connexion inside the USB (to see it in gtkterm).

But I don't find out how to setup easily two serial connexion without using SoftwareSerial (which is not compatible with Intel Galileo Gen 1).
How can I do that ?

Léo

2

You might try putting some dummy program on the galileo that does not use the galileo serial port, then connect the GPS tx to the galileo tx pin (and connect the grounds). what ever is sent from the gps should be sent to the USB serial chip and to what ever is connected to the USB.

3

Hello :slight_smile:

I tried what you said but that doesn't works.
I pushed "blink" example, and I listen ttyACM0 using gtkterm, at 4800 bauds (NMEA) but nothing.

I'm using a GPS shield between NMEA and my Galileo.
I tried many things since yesterday :

  • GPS is working fine when alone (not connected to Galileo)
  • When the shield is connected to GPS but not Galileo, I can see my NMEA data on RX pin
  • When I plug the GPS shield, nothing on RX, like if Galileo pull the RX pin to GND.
  • I tried to connect my GPS shield RX pin (with datas) to the TX pin of the Galileo (in case le shield is wrong) but allways nothing.

Is that possible that my Galileo pull serial to 0 ?

Thanks for all

Léo

4

Hello again,

Here is an example of my problem, before connecting GPS TX pin to Galileo RX pin, I can read data on the GPS output (I'm using USB to serial converter), after connecting pins together (using switch), I can't read anything.

GalileoGPS.png
GalileoGPS.png667×689 108 KB

5

before connecting GPS TX pin to Galileo RX pin, I can read data on the GPS output (I'm using USB to serial converter). Is that possible that my Galileo pull serial to 0 ?

Does the gps output TTL or rs232? TTL pins (both tx and rx) should be at +5v with no communication taking place. Check yours with a multimeter. What is the galileo bus voltage when the gps is attached?