I'm having trouble with this index selectable filter schematic. Bob helped me make a pulse counter that will count up to a value, and once it reaches it, the next pin toggle it starts at 0 and it counts up again, and is reset via another pin. The counter works, as does the reset.
I hooked it to an index selectable filter. The filter works, toggling through the different filters associated with the index. But when the counter reaches it's terminal count and goes to 0 on the next pin toggle, the index filter stays on the last one (filter 4 in this example). If I toggle again (to 1) it then goes to filter 1 and behaves normally until it starts at 0 again. It always skips the 0 filter unless I reset it.
I think there is some funky timing thing going on, but I can't capture it with the readback function, the counter looks good.
I'm testing this with the 1701EZ board with white noise on the input and a spectrum analyzer on the output, so I can see the filters as they change..
I'd love some debug advice on how to fix this.
thanks a lot,