Reducing flash0 usage #76
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flash0 の 96k 制限にあたりつつあるので、小手先の削減案です。
fft.h の sin_table は使用量の割に、1スイープにつき1回しか実行されない IFFT のためのもので、あまりパフォーマンスがあがらないテーブルです。これを削除して普通に sin/cos 関数を呼びます。
(もしくは caldata の flash 領域を最適化する必要があるのかもしれません)