Update. Tried using the another GPS at 9600 baud and I now the LCD screen works. So it seems that the callbacks were coming to fast for the screen to keep up.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Update. Tried using the another GPS at 9600 baud and I now the LCD screen works. So it seems that the callbacks were coming to fast for the screen to keep up.
Thanks for your help.