arm fft, stm32F405RGT6, 6WS

-O2, debug level2.

encode 1200 (40mS frame)
1745799 : 10.39mS
decode
2292497 : 13.64mS

so, 2x speed of my other runs

let's run 5WS

encode 1200 (40mS frame)
1579922 : 9.4mS
decode
2073979 : 12.34mS

WOW the wait states hurt on the M4 !!!!






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