About DetlefS

DetlefS · 2024-03-27

Hi, I use CubeIDE 12 and compile and load my code with the the green and white 'run debug' button at the top. That works fine but at the end some file from the project pops up and the editor is focus away from the sourcefile to that file. Where/how c...

DetlefS · 2023-12-04

Hi,I use a STM32F767 Nucleo-144 board with a STM32F767ZIT6 processor.With CubeIDE I configure SPI1 as I2S1 input and pump the data via DMA2/Stream0 in a short 8x16Bit circular buffer. The clock of the SPI1 is at ~ 3MHz .I set up the HAL_I2S_RxHalfCp...

DetlefS · 2023-07-11

Hi, for a STM32F303RE I configured a pin as an ADC input. I want to use the pullup/pulldown resistors as a voltage divider for an offset voltage. I tried to switch on both in ADC mode, that did not work. Everything is fine with the pin configured as ...

DetlefS · 2024-03-27

Hi, ok, good to know. I only update to a newer version if I'm forced to. Clicking away an unwanted file is too weak a force to update  .THXCheersDetlef

DetlefS · 2023-12-07

I stopped SysTick and the jitter was still present. Something is responsible for the jitter, that is very true.The screenshot will tell you about the 95238Hz.CheersDetlef

DetlefS · 2023-12-06

>> Why shouldnt I generate the square wave in the I2S?>You mean, in the I2S interrupt? Exactly because there are many possible sources of jitter.Yes, but what source causes the 330ns jitter?>> The calculated number of counts only works in 'up' mode, ...

DetlefS · 2023-12-06

>> And what is the cause of that jitter?This was my question. I dunno.Why shouldnt I generate the square wave in the I2S? Syncronicity is forced.I now use a syncronous timer pwm. That raised some issues as well. The calculated number of counts only ...

DetlefS · 2023-12-06

>>Why would you miss a bit with hardware I2S?I do not miss a bit. I do not see phase jumps, I see phase jitter.>>Using Cube/HAL in a timing constrained application is never a good idea.I've come to the same conclusion.THX Cheers Detlef

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Some files popping up

Interrupt Service Routine Jitter

ADC and pullup/pulldown

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