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STM32F7 QSPI Erase and Write (with DMA) Too Slow

Question asked by Benjun Liu on Jun 7, 2018

Hi, all,

 

I have already implemented the configuration of QSPI working in QUAD mode, and DMA2. I want to ready and write about 15M Byte data with QSPI flash. The time cost for reading data is about 2s. However, the time cost for erasing 15M Byte is about 28s, and writing is about 38s. Is there any way to improve the speed performance for writing and erasing?

Because it seems that the speeds for writing and reading are unbelievably different.

 

stm32f746 qspislow

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