gateware: generic SGPIOInterface, simpler capture mgmt, fix resampler bugs #1639
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This does not fix #1629 for me. I can get the spectrum to invert by repeatedly adjusting the sample rate. It sometimes gets into a state where crossing a decimation threshold (usually at 2.5 Msps) reliably flips the spectrum for a while. This may have been random, but it seemed like it was easier to reproduce the problem after changing the starting sample rate from 2.5 Msps to 20 Msps in the flowgraph. |
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Simplified the filter architecture by using an adder tree for obtaining the final sum of the subfilters (vs systolic array). Previously, no backpressure (always_ready=True) worked fine but otherwise we lost samples.
Prevent loosing track of the IQ time-multiplexing state within the FIR filter.
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Also fixes #1629