About David George

David George · 2024-12-11

HelloI have a custom board with a STM32H730 and SD Card connected to the SDMMC peripheral, quad lines. I'm using the FatFs file system as added in CubeMX.My question is why does the file write rate drop after the first file (open/write/close) unless ...

David George · 2024-10-30

If you're still not seeing any "ITM printf()" output in the SWV ITM Data Console and you've checked the following;the SWO signal is connected to the ST Linkprovided a _write() function that calls ITM_SendChar()ticked Enable Port 0 in Seral Wire Viewe...

David George · 2024-04-11

Hello allI know there have been plenty of posts about TouchGFX not providing the full set of display rotation options usually found in other GUI systems such as emWin (0, 90, 180, 270 degrees). But I wanted to ask ST / TouchGFX if there any plans to ...

David George · 2024-04-05

Hello allI have a STM32H730 project on a custom board.I have two W25Q16JW 2MB Flash connected to the OctalSPI in Dual-Quad mode.I have created a Flashloader ".stdlr" for my external Flash - its all working great in Cube Programmer and I can erase/pro...

David George · 2018-02-16

Posted on February 16, 2018 at 15:53I have a problem with an STM32F767 on a custom board with SDRAM and NAND SLC memory connected to the FMC.The NAND is 8 bit, the SDRAM is 32bit, so only the [D0:D7] signals are shared between the SDRAM and the NAND...

David George · 2024-12-11

Hi.The times quoted include the f_mount() and f_unmount() times.However actual f_mount() and f_unmount() times are fast (<1ms). This is around 643ms for the 20 x 1kB writes.for ( i=0; i<20; i++ ) { f_mount(), f_open(), f_write(), f_close(), f_unlin...

David George · 2024-12-11

Hi,Have tried 2 x f_write() with 512 bytes of data each time, output is..File 20 x 512 Byte Write with mount/unmount each time.> elapsed time = 643 msFile 20 x 512 Byte Write with one mount/unmount.> elapsed time = 3522 msStill takes significantly lo...

David George · 2024-10-30

Hi, it wasn't meant to be post for help, I just wanted to raise the point that the TRACE clock frequency is often overlooked in posts about SWV not working in CubeIDE. Hopefully of help to someone in the future.

David George · 2024-04-18

The display controller I'm currently using (ST7789V) does not have a HDIR or VDIR hardware pin.But you got me thinking, I noticed the ST7789V does have a "RGB to RAM" mode (instead of sending the RGB data directly to the display shift register as I w...

David George · 2024-04-11

The registers you are talking about (Row, Column address increment control) are only used when transferring display data from the internal display RAM in the display controller. The display data in this internal RAM is usually sent using a slower I2C...

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FatFs on an SD Card - Write speed drops unless I unmount/mount each time I open a file.

SWV Not Working - tried everything, then check the TRACE Clock source!

TouchGFX Display Orientation Setting - 0/90/180/270 degrees?

Debugging Flash Bootloader and External Flash Application - Can't Set Breakpoint

SMT32F7; FMC with SDRAM & NAND Problem.

Re: FatFs on an SD Card - Write speed drops unless I unmount/mount each time I open a file.

Re: FatFs on an SD Card - Write speed drops unless I unmount/mount each time I open a file.

Re: SWV Not Working - tried everything, check the TRACE Clock source!

Re: TouchGFX Display Orientation Setting - 0/90/180/270 degrees?

Re: TouchGFX Display Orientation Setting - 0/90/180/270 degrees?