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#!/usr/bin/ruby -w
TARGET_FREQ = ARGV.shift.to_f
NATIVE_FREQ = 50.0
CLOCK_WIDTH = 5
best = nil
best_mult = nil
best_div = nil
1.upto(2**CLOCK_WIDTH) do | mult |
1.upto(2**CLOCK_WIDTH) do | div |
new = NATIVE_FREQ * mult / div
if not best or (new - TARGET_FREQ).abs < (best - TARGET_FREQ).abs or ((new - TARGET_FREQ).abs == (best - TARGET_FREQ).abs and (mult + div) < (best_mult + best_div))
best = new
best_mult = mult
best_div = div
end
end
end
error = (best - TARGET_FREQ).abs / TARGET_FREQ
$stdout.write("Closest I can get is #{best}: *#{best_mult} /#{best_div} (#{(error * 100).round}% error)\n")
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