Safe & Sound @ E14-CLEWE @#8_GPS issues

RE: Safe & Sound @ E14-CLEWE @#8_GPS issues

cstanton — Mon, 05 Jun 2017 09:30:55 GMT

[mention:030052a2defd4db5905e641faba08f52:e9ed411860ed4f2ba0265705b8793d05] , what are the pin numbers you're actually connecting the GPS shield's RX and TX to on the MSP430?

According to a cursory search on the internet the hardware UART pins are 3.2(rx) and 3.3(tx) aka pins 3 and 4 on the Energia Pin map.

The secondary serial port is apparently shared with USB, so if you're using that one you won't see anything on the serial monitor.

If it's still not working then I'd suggest it's a baud rate issue.

RE: Safe & Sound @ E14-CLEWE @#8_GPS issues

mcb1 — Sun, 30 Apr 2017 03:21:18 GMT

Since the LCD was occupying the 3v and I had used the 5v successfully with the Arduino

Arduino inputs seem to be more tolerant to the wrong voltage.

Part of the troubleshooting for Arduino is to loop back D0 and D1 and see if the serial from your device is echoed.

While this is the 'other way' loop back is an important tool to use to verify something.

If you have a FTDI (USB to Serial) device it might be worth trying. Mine has the ability to switch to between 5v and 3v3, which makes it super useful.

Mark

RE: Safe & Sound @ E14-CLEWE @#8_GPS issues

jomoenginer — Thu, 27 Apr 2017 20:58:38 GMT

You might need to enable the pins with pull ups on the MSP432 to get them to work properly with the GPS device.

Check the pin numbers on the MSP432, but you should have something like:

pinMode(6, INPUT_PULLUP);
pinMode(5, INPUT_PULLUP);
pinMode(9, INPUT_PULLUP);

However, as is quite common when trying to use Arduino compatible shields, they are usually set for 5v where as other devices are 3.3v on the GPIO as i believe the MSP432 is. In this case, you can a level shifter from 5v to 3.3v between the MSP432 and the GPS board to convert between the two values.

In Energia, there should be an UART example for the MSP432 that you can use to test the com port functionality and use that as a baseline for the GPS.

RE: Safe & Sound @ E14-CLEWE @#8_GPS issues

dougw — Sun, 23 Apr 2017 03:36:37 GMT

Sounds like a proper nightmare. So simple nothing can go wrong, but it doesn't work.

If you can try looking at the signal coming from the GPS with a scope, you can figure out if the pins are connected correctly, whether the voltage is correct and what the baud rate is.

On the Launchpad, adjust your code to print every character that is received - don't wait for a CR or LF character. This should confirm if you have the correct receive pin configured.

If the character string is to short, it may indicate the baud rate is too low and vice versa.

I think all of my GPS devices work on 3.3V, but I know some others can work with 5V.

Maybe you can find a loop back test program and connect the TX to the Rx on the Launchpad to ensure the serial port is working.