seveibar/am3352-dev-board-4layer-dogbone

scripts/via_travel.py

"""Measure used barrel travel without guessing unspecified inner-layer depths."""
def via_travel(path, layers, thickness):
    # A graph may represent a plated barrel as a star. Collapse intermediate
    # graph nodes at one XY site to the layers on which the route enters/leaves.
    collapsed=[]
    i=0
    while i<len(path):
        j=i+1
        while j<len(path) and path[j][:2]==path[i][:2]:j+=1
        collapsed.append(path[i])
        if path[j-1][2]!=path[i][2]:collapsed.append(path[j-1])
        i=j
    coefficients={layer:0 for layer in layers}
    sequence=[collapsed[0][2]] if collapsed else []
    for a,b in zip(collapsed,collapsed[1:]):
        if a[2]==b[2]:continue
        shallow,deep=sorted((a[2],b[2]),key=layers.index)
        coefficients[deep]+=1
        coefficients[shallow]-=1
        sequence.append(b[2])
    known=all(coefficients[l]==0 for l in layers[1:-1])
    return {'layerSequence':sequence,'depthCoefficients':coefficients,
            'verticalLengthMm':round(coefficients[layers[-1]]*thickness,6) if known else None}