SPI Clock

[marco3]

Posted on October 05, 2016 at 19:34

I'm using SPI to get data from and ADC: I need fast acquisition so I'm using a STM32F4 board at 50MHz. Using a Logic software I noticed that the spi clock doesn't work at high frequency (50MHz), while it works at lower (16MHz). Why is that? I generate the code with CubeMX setting 50MHz in the Clock configuration tab. Did I miss something?

Thanks

[Tesla DeLorean]

Posted on October 05, 2016 at 20:16

And the AHB, APB1 and APB2 clocks are what?

I'm hard pressed to see you getting 16 MHz from a 50 MHz source, using integer dividers.

What are you looking at the signals with? Use a scope probe in 10x mode.

[marco3]

Posted on October 05, 2016 at 21:06

AHB, APB1 and APB2 are all 50MHz

[Tesla DeLorean]

Posted on October 05, 2016 at 22:22

Ok, you're not providing much detail to work with here...

[Walid FTITI_O]

Posted on October 06, 2016 at 12:24

Hi pirotta.marco, 

As Clive said , you are not providing many details about your application and issue. 

Try to add a code ( main function, system clock configuration , SPI configuration..)

Try to describe more the hardware you are using , the clock source, the connection you setup..

As much you provide details, as more you get help from forum.

-Hannibal-