Can I directly write in memory-mapped mode over QSPI of STM32H7 to NOR Flash

[JJ.Lin]

Hi,

Can I directly write in memory-mapped mode over QSPI of STM32H7 to NOR Flash?

Thanks!

[mƎALLEm]

Dear @JJ.Lin​ ,

According to the AN4760  "Quad-SPI interface on STM32 microcontrollers and microprocessors" :

Page 23:

"The Memory-mapped mode is used in below cases:

• For reading operations.

• To use external Quad-SPI Flash memory like an internal memory, so any AHB master can read data autonomously.

• For code execution from external Quad-SPI Flash memory"

Page 22:

"In case of an erase or programming operation, the Indirect mode has to be used and all the operations have to be handled by software."

Page 22:

"The Indirect mode is used in below cases:

• For reading, writing or erasing operations.

• If there is no need for AHB masters to access autonomously the Quad-SPI memory (available in Memorymapped mode).

• For all the operations to be performed through the QUADSPI data registers using CPU or using DMA.

• To configure the Quad-SPI Flash memory."

SofLit