Unable to read data from w25q64 using stm32h7b0vbt6

[Mohammadreza-Azizi]

Hi. I'm trying to read data from W25Q64 flash memory.

These are my connections:

And these are my SPI and RCC and GPIO settings:

And these are my functions and main code:

Using W25Q_ReadID function, i could read device ID.

But i can't read data stored on device using W25Q_Read.

these are my result that i think they're wrong:

what's wrong with my code or configurations?

[TDK · Accepted solution]

> these are my result that i think they're wrong

Why? You haven't written anything, so what are you expecting to read out?

A proper test would be to erase a block, verify it reads back 0xFF, then write to it, and verify it read out the same as you wrote.

You only reading 20 bytes, so it's irrelevant what RxData[341] is.

85 in hex is 0x55. Probably that's what you wrote there and the code is working fine.

[Mohammadreza-Azizi]

Dear @TDK thanks for your helpful suggestion. that was true and it works.

[Mohammadreza-Azizi]

Dear @TDK i have another problem. when i erase and write the chip and after that i read the chip, i read my written data.

But after that, when i just read the chip it shows 0xff

why?