Flash memory frequency using QSPI is too slow.

[peter81]

The stm32h747 controls Flash memory using qspi.

Flash is using mt25ql256.

Write and Read actions have been confirmed.

​But the frequency doesn't come out like a data sheet in flash memory.

The speed of the QSPI clock is around 1.25Mhz.

QSPI  ClockPrescaler  : 2

The frequency does not come out like a flash memory data sheet.

I want to know what the problem is, please help me!!

[Tesla DeLorean]

Unpack the clocks as the MCU sees them.

  printf("\n\nCore=%d, %d MHz\n", SystemCoreClock, SystemCoreClock / 1000000);
  printf("HCLK=%d\n", HAL_RCC_GetHCLKFreq());
  printf("APB1=%d\n", HAL_RCC_GetPCLK1Freq());
  printf("APB2=%d\n", HAL_RCC_GetPCLK2Freq());

Likely not running with the bus clocks you think it is.

Check the clock initialization code doesn't fail, either HSE or PLL failing to come ready would be my guess.