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Fero · 2022-10-25

Hi there,I have encouraged a strange behavior inside newlib_lock_glue.c.On few devices the code does note execute correctly when the optimization is turned on.To me it looks like the optimization throw away the return and just continue evaluating. th...

Fero · 2022-01-31

Hi I am using FreeRTOS on STM32H7. For large data, I am using qspi attached and memory mapped external psram.Question is: what will happen if both task try to read/write to psram at the same time?Is there any cache or buffer in place?What if the sche...

Fero · 2020-09-09

Hi there, I trying to configure octospi on STM32H7A3 to work with LY68L6400 PSRAM via quadspi.I have followed AN505 and managed to init, write and read from the memory successfully in indirect mode.Now I am trying to map the PSRAM to memory. I can re...

Fero · 2022-02-02

Thank you for your answers. Good to know that is is safe to use it as normal memory.The problem was that I had wrong psram size set and therefore 0x90000000 and 0x90800000 shared same memory :tired_face: This caused to overwrite memory at 0x90000000 ...

Fero · 2021-03-26

I have it working now thanks to ST support:There is an errata for this, enable DQS during write operation in memory mapped modecmd.DQSMode = HAL_OSPI_DQS_ENABLE;The DQS should be enabled in memory mapped mode during write operations (DQSEin OCTOSPI_W...

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Compiler optimization does not produce correct code

Can FreeRTOS tasks access memory mapped qspi psram at the same time?

How to configure OctoSPI in Quad mode with PSRAM for memory mapped write access? Getting Hard Fault (FORCED, IMPRECISSERR) when write is attempted.

Re: Can FreeRTOS tasks access memory mapped qspi psram at the same time?

Re: How to configure OctoSPI in Quad mode with PSRAM for memory mapped write access? Getting Hard Fault (FORCED, IMPRECISSERR) when write is attempted.