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fb · 2023-04-28

I'm using a 1280x800 pixel display with 72 MHz pixel clock, and an external SDRAM. Sometimes I see glitches like this, where parts of the image is horizontally displaced:https://www.youtube.com/watch?v=_pluyvL0PvIThe SDRAM is the IS42S32200L with 32 ...

fb · 2021-06-18

I have a project with a STM32H7 part generated with CubeMX, but I want to copy the code to RAM after reset and then run it from RAM, because I want to change the flash where the code is running. How can I do this?I noticed there is a linker file STM3...

fb · 2021-04-02

I think the article here:https://community.st.com/s/article/FAQ-DMA-is-not-working-on-STM32H7-devicesis wrong. In solution 3 it invalidate D-cache before reception. This doesn't make sense, it has to invalidate the D-cache after reception.

fb · 2021-03-25

I'm using this code to read from a flash chip with quad SPI: // send read command and read page data OSPI_RegularCmdTypeDef sCommand; memset(&sCommand, 0, sizeof(sCommand)); sCommand.OperationType = HAL_OSPI_OPTYPE_COMMON_CFG; sCommand.FlashId = ...

fb · 2021-03-25

I've implemented a hello world project, by just using the default settings with CubeMX for the NUCLEO-H723ZG board, then disabling ethernet and USB-to-go, and then adding a yellow LED blink code. Full project and generated code, for STM32CubeIDE:http...

fb · 2023-06-23

Sure, start here:https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-section-function-attributethen read about how the GCC linker works, and for the details, read the startup assembly code.

fb · 2023-04-28

Yes, I'm sure it is 1280x800. Sorry for the bad mobile phone recording.

fb · 2023-04-28

According to the application note, the highest pixel clock with STM32H757 and SDRAM with 32 bit is 150 MHz, for 16 bit mode. So the 72 MHz I'm using is not on the edge, as expected.The line length is also a multiple of 128, so it can do all reads wit...

fb · 2023-04-28

Thanks, do you have a link to the app note?I don't think it is on the edge, because 100 MHz with 32 bit data interface means a little bit less than 3.2 Gbit/s, if burst mode is used. And 16 bit with 72 MHz needs only 1.1 Gbit/s. And it wouldn't expla...

fb · 2021-07-15

Meanwhile I solved the problem with a macro:#define RAMCODE attribute ((long_call, section (".data")))For every function that needs to be in RAM, I just use this macro in front of the function:RAMCODE HAL_StatusTypeDef FLASH_EraseSector(uint8_t secto...

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display glitch with STM32H757

How to run code in RAM?

"DMA is not working on STM32H7 devices" article is wrong

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