About JohnS

JohnS · 2022-04-18

I'm working on a system that requires the ability to do an Over The Air (OTA) upgrade. It's on a TouchGFX project, and the MCU is a 64K internal flash so the project exists on the QSPI flash in Memory Mapped Mode (MMM). I learned MMM is read only, ...

JohnS · 2022-03-18

I have a STM32F7xx MCU connected to a Winbond W25Q01. The datasheet says the chip will run up to 133MHz. If I set the MCU clock to 108MHz and the quadspi clock prescaler to 0 so that they are running at the same frequency, the chip initializes and c...

JohnS · 2022-04-26

With some help from a very smart friend I was able to get to the bottom of what was happening and the very strange behavior I was seeing. I commented repeatedly that it was behaving as though I was talking to one QSPI in my program, and the other one...

JohnS · 2022-04-25

So I've got some odd behavior I can't explain, would like to get the community's thoughts:I am able to incorporate the chip into my project, and when I connect to it I am able to program and read data from it. I can shut off the board and read data ...

JohnS · 2022-04-22

I just got hardware in hand, so hopefully this goes smoothly... for once. If you have a chance to test or have any additional tips, please let me know. I hope to share details of what works with the community soon.

JohnS · 2022-04-18

Thank you for your responses and being willing to look into it further. My MCU is F7 family, specifically STM32F750N8H6.

JohnS · 2022-04-08

SOLVED I also had to set CSHT to 6 cycles, but the real big change was I found that it was able to run at 108Mhz when the processor was at 216Mhz when "Sample Shifting Half Cycle" was enabled. I believe that this also explains why it would run at ...

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How do I initilize two QSPI flash chips but only place one in Memory Mapped Mode?

[SOLVED] How can I fix frequency sensitivity in QUADSPI communication?

Re: How do I initilize two QSPI flash chips but only place one in Memory Mapped Mode?

Re: How do I initilize two QSPI flash chips but only place one in Memory Mapped Mode?

Re: How do I initilize two QSPI flash chips but only place one in Memory Mapped Mode?

Re: How do I initilize two QSPI flash chips but only place one in Memory Mapped Mode?

Re: [SOLVED] How can I fix frequency sensitivity in QUADSPI communication?