Low qspi clock frequency in ExtMem_Boot

DDi S.1 · ‎2025-05-12

I noticed that any example created with touchGfx for the STM32H750B-DK demo board uses the ExtMem_Boot bootLoader that uses a 400Mhz clock instead of 480Mhz, but the strangest thing is that it uses a QSPI clock of only 50Mhz, when from the memory datasheet it could reach 120Mhz.

mƎALLEm · ‎2025-06-11

Hello,

You need also to insure the GPIOs used by the QuadSPI are in high or very high speed mode:

AN4760:

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