GP3 FAQ

Frequently asked questions about the GP3, GP3-X, GP3-B, and all other GP3 variants.

What is the pin out of the TTLSER port on the GP3X board?
Pin 1 - RTS Pin 2 - CTS Pin 3 - RXD Pin 4 - TXD Power and ground are available on the pins near the A4 edge connector. Keep in mind these are lo...
Wed, 22 Jan, 2014 at 11:17 PM
Why does the hardware counter seem to miss the first count?
The underlying hardware counter insists on seeing one falling edge before it will count a rising edge by design. A common mistake when testing is to write s...
Wed, 22 Jan, 2014 at 11:18 PM
How do I get the best results from the A/D converter?
First, note that channels that are not connected to anything will pick up noise and read wildly varying random values, which are probably not 0! Secon...
Wed, 22 Jan, 2014 at 11:19 PM
How do I build the gp3lib files into a Linux shared library?
Easy. First make sure the DEMO symbol in gp3lib.c is set to 0. This disables the main function. Then issue: gcc -fPIC -g -c gp3linux.c gcc...
Wed, 22 Jan, 2014 at 11:20 PM
How can I use the GP3 under Linux?
Download the Linux library from the main GP3 page (http://www.awce.com/gp3.htm). When you unzip the file you'll find several .c and .h files along with...
Wed, 22 Jan, 2014 at 11:22 PM
How can I use the GP3 with Java?
Java's serial port support has a checkered history, with Sun not putting a lot of effort into the javax.comm library. Because of that, there is a commu...
Wed, 22 Jan, 2014 at 11:25 PM
My GP3 doesn't seem to work. What could be wrong?
 Unlike previous GP3 models, the newest GP3A requires a pin on the board to be jumpered differently depending on the operating mode you want (as covered in ...
Wed, 22 Jan, 2014 at 11:26 PM
How do I connect the program select pin?
That depends. When you first build the board, we suggest connecting the pin to +5V. This will run the self test (the LED will blink 10 times, pause, a...
Wed, 22 Jan, 2014 at 11:27 PM