Basically I am trying to grab GPS data and display it on a serial LCD screen.

The input device is running at 56K, which is a GPS. ( I know, higher than normal, but thats what this chip outputs).

Its TTL( the GPS), so thats the desire to use the LPC936, I don't have to change to RS232 levels.

The output from the GPS is standard NMEA data, so its not like I need to control any of the RF on it, meaning less usage of the micro controller.

Basically, I want the microcontroller to read one of the messages coming in from the GPS, extract the Lat/Lon, and then be able to send the messages to a serial display. The serial display requires me to put the output in a special, non sophisticated format, but it comes out to about 2K of hex numbers. the only kind of calculation I do is for the Checksum, and thats a modulo 256 and then I just add 14 to it.

The display ALSO runs at 56K, and has return messages that let me know if it accepts the data packet ( but its possible that these could be ignored).
I figured I could run the display off the UART, and bitbang the gps.


I have thought about the I2C interface, and was about ready to go that way. I have implemented an interface to I2C in C before ( a windows computer), but I am unsure how different it will be. Maybe the SPI would be a little more straightforward?