About LCE

LCE · 2025-03-20

Heyho, just checked the build analyser in STM32CubeIDE for my L031 project and found "impure_data" in the RAM list.Can anyone please explain what that is? Google didn't really help... Just curious, RAM size is not a problem for this project (32kB fla...

LCE · 2025-03-18

Heyho,I have some custom miniature PCBs here, the unholy combination of a super-high-impedance-low-noise amplifier (going to a low noise audio input with 24bit ADC, spectra below from that one) and a STM32L031 on another PCB.Both circuits share the s...

LCE · 2025-03-04

Heyho,I'm currently using a GPIO on a STM32L031 for a custom 1-wire interface, which means it's switching all the time between input and output mode (open drain).So far I have learned that the EXTI interrupt only works with GPIOs in input mode.My que...

LCE · 2025-02-06

Hello ST,is there a document showing identical peripherals between STM32 MCUs / MPUs / types / families ?It would be really helpful before switching to another MCU / MPU to have an overview.Especially for the non-HAL users.Best would be evaluations l...

LCE · 2024-10-16

Heyho,I'm using the H733 (custom board) / H735 (eval kit) with Infineon's HyperRAM S70KL1281 / S70KL1282 at 100 MHz for some time now, all working great, except for one thing that is very annoying:the data throughput from / to HyperRAM seems to depen...

LCE · 2025-03-21

Then compare the function Do_Reverb() to your FIR filter concerning execution time. I'm pretty sure that the cause for the glitches is the setting of the I2S buffer pointers by the interrupts:- the processing starts in main loop with the data ready f...

LCE · 2025-03-20

So, what I said in the first post, the H7 is not made for that.50k cycles is just too many, but maybe you can optimize your code, maybe using integer math is good enough.But do you at least get out what you put in without any processing?

LCE · 2025-03-20

No specific problem description (means: no source code), so only general advice possible:do not only "hear" sound, check with scope and audio analyser (some freeware PC audio stuff is usually good enough)do not input complex audio, start with sine on...

LCE · 2025-03-20

> also some "uncommitted" IOs ...... with at least some testpoint / pad for debugging via GPIO & scope.

LCE · 2025-03-20

In general:do not think of "GND" / 0V as the magic zero-impedance return path, it is neverkeep all switched signals as short as possible, that's even more important for switched high currents - and don't forget the GND/0V return path (e.g. for a swit...

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What is impure_data?

STM32L031 noisy, even in reset

GPIO & EXTI: switching between input & output

Overview identical peripherals between STM32 MCUs / MPUs / types / families

H7 OCTOSPI HyperRAM data throughput changing with compilation

Re: STM32H743 realtime audio processing with DSP

Re: STM32H743 realtime audio processing with DSP

Re: STM32H743 realtime audio processing with DSP

Re: PCB Critiques

Re: PCB Critiques