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How to use 30Mhz clock on SPI SCK.

Question asked by arbitrer on Jul 8, 2015
I'm using stm32f429. I have configured my system core clock to 160Mhz and I use the APB2 clock divider as 4, which gives me 40Mhz to my SPI4 peripheral ,
I want to use my SPI peripheral at 30Mhz, since the SPI core clock is 40 when I divide it using the prescalars the frequency's that i'll get 40,20,10,....
I can't change the core clock from160Mhz and the SPI peripheral.
So is there any way to set 30Mhz on my SPI4 without changing core clock and APB2 clock divider value.