The serial is just for test purpose but now i will know it just does not work.
The sd reading must be my problem so... but i really do not know how reading another way but synchronize with my timer...
Why am i not able to write or read ports with this kind of libraries in ISR ? Is it a delay problem or worse ?
If there is not good and simple solutions i will need to copy libraries with advanced buffer/spi code and only change the timer before be able to test the change of pwm frequence. What a shame i cannot customize resolution of timer2 to use the previous projects. And prescale would slow and so be useless.
By the way if someone know well about pwm noise so it could spare me my noob tests.
Thank you all.