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Well it has been a long time coming so here is the embedded software design. RSS block diagramFigure 1. The Plan: The Arduino must send and receive information asynchronously, via the byte serial USB host connection, on Port 1. This connection It must receive and respond to the RSS_IOP commands It must send data to the RSS_IOP when something changes Basicly you need 1 Arduino Mega per tuner. It has lots of Digital I/O, and its cheap! The protocol must be easy and expandable for all typ ...
The Plan Part 3: Ok the interface card is now wired up and hooked to a computer so we get on checking the software switch states. So I hooked my arduino to my radio interface, added the jumpers and plugged in the interface cable and then generated a truth table from that data (see figures 1,  2). int frac[] = {20, 5, 8, 2, 16, 4, 1, 9, 10, 18 };   int huns[20][2] = { {13, 0}, {9, 108},{11, 109}, {5, 110}, {27, 111}, {16, 112}, {30, 113}, {2, 114}, {23, 115}, {8, 116}, {28, 117}, ...