I hooked up the ex/!ex wires and tried the 8 different combinations of sin+/sin- and cos+/cos- while streaming "poscnt" and manually turning the shaft. No luck, it was all zeros
I think I'll just bite the bullet and buy a cheapo ebay scope; I don't think I'll need a ton of bandwidth. From what I understand, with none of the resolver leads connected, I should be seeing a voltage on the ex/!ex outputs (normally 3.6 Vpp centered around 2.5V but I don't have the board docs in front of me rn so cant calculate actual voltage at the pins). Then, connecting the leads, I should be seeing sinusoidal outputs on the sin+/sin- and cos+/cos- leads, and due to their names I'm assuming the cos one lags 90deg behind the sin signal.
I've got the heat sink, cap "sandwhich", battery, etc. all ready, they're just waiting for a resolver to start testing