About frackers

frackers · 2024-08-01

Using a stm32f303RE Nucleo board which has 4 (independent ?) ADC blocks.I'm trying to read a single channel from each of the 4 ADC under DMA simultaneously triggered from the same timer update event but I'm only getting about 30-40% of the data I'm a...

frackers · 2021-08-10

I've read the Release Notes and they say nothing about any bugs that may have been fixed going from STemwin 5.40 to 5.44 (for example the memory leak in GUI_GIF_DrawEx).Does such a document exist, if so can someone post a link to it please?Cheers

frackers · 2021-07-01

A year ago I had a lot of grief getting the JPEG peripheral working - came down to memory regions! Now I want to improve the quality by changing from JPEG_420_SUBSAMPLING to JPEG_444_SUBSAMPLING but I get random hard faults .Is it possible the jpeg ...

frackers · 2021-02-18

If I try to encode blocks of colour using the hardware JPEG encode in an F7 from a BMP image (screen memory in this case) they fail if the colour is pure (e.g. all red, all blue) and they come out different shades of green.By experiment, I have found...

frackers · 2020-11-03

I've tried both Eclipse and the VSCode Cortex debug plugin to set a conditional watchpoint but both fail (break every access irrespective of value). This I guess is due to OpenOCD not supporting the multiple compare registers in the DWT that are requ...

frackers · 2024-08-08

6.12 crashes when opening an existing 6.11.1 project on Linux Debian Jessie (8). Works OK on Ubuntu Jammy Jellyfish (22.04). Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "com.teamdev.jxbrowser.browser.Browser.m...

frackers · 2024-08-02

Solved - silly typo had the memory array for the 4 DMA channels the 'wrong way round' !!

frackers · 2024-08-02

Further information:Each of the 4 ADC blocks read the same values (+/- 5 counts) even though 2 out of the 4 have their inputs grounded.They are supposed to be reading a 40KHz sinewave signal but it looks like I have nearly 100% crosstalk between ADCs...

frackers · 2021-01-19

Check that the memory you use for the DMA buffers is accessible to the JPG block. I had 6 months of grief finding this out on an F7 as by default only the first 128k is in the correct cache region

frackers · 2020-11-03

Rather than 'Blue Pill', take a look at 'Black Pill' which has a choice of f401 or f411. Make sure to get the latest V3 PCBs, there are a lot of sellers flogging off older versions.BTW: The last Blue Pills I got had fake f103 on them - took a lot of ...

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Short read from multiple ADCs under DMA

Is there a changelog for 5.40 => 5.44 NOT Release Notes

Hardware JPEG Encoder at better than JPEG_420_SUBSAMPLING

F7 hardware jpeg encoding colour failure

Conditional data watchpoint with debugger or DWT

Re: STM32CubeMX 6.12.0 released

Re: Short read from multiple ADCs under DMA

Re: Short read from multiple ADCs under DMA

Re: JPEG encoding issue when using DMA on STM32H7B3

Re: Newbie Question: STM32F103 or newer equivalent for new project?