using arduino nano spi interface can not write register correctly if there is no delay after cs pin is set to low ,when i add delayMicroseconds(250) ,it can write register correctly,Tsu.cs is 8 ns .why???
using arduino nano spi interface can not write register correctly if there is no delay after cs pin is set to low ,when i add delayMicroseconds(250) ,it can write register correctly,Tsu.cs is 8 ns .why???