SPI on F4

Limited support for STM32F4 Discovery, Nucleo and custom F4 boards
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Re: SPI on F4

Post by ag123 » Sat May 13, 2017 1:23 pm

f1 on APB2 runs at 72 mhz hence SPI would deliver 36 mhz if that's the case, while on f4 it is 42 mhz and 21 mhz on the spi bus that would seem a little 'strange' in the sense that it implies sd cards would run faster on f1. the 'secret' may be that 'ART' accelerator which possibly make some cycles zero wait states on F4 :lol:

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