MegaSquirt Expansion Board Assembly Guide

The test code is quite simple, toggle an input bit and the correspond output bit toggles.

Download the test code by clicking this link

The test code is arranged by input pin on J13 and output pin on J12, so

J13 pin 1 toggles J12 pin 1,
J13 pin 2 toggles J12 pin 2,
.......
J13 pin 7 toggles J12 pin 7

The 3 un-buffered inputs are active low in the test code as the internal pull up resistors have been enabled on the 908.

The test code is verified and works. If you open the .asm file you will see the 20 or so lines of code that make this go. This is a good file for users to start writing custom code from as all the original variables are still included and it assembles/links ok.

Links:

Introduction,
Hardware,
Assembly Guide (this page),
DigiKey BOM Ordering page,