Hi everyone,

I'm looking for someone with solid STM32F4 experience who can help me debug and verify a simple but problematic ADC-to-DAC signal path on an STM32F407VGT6.

The project:

MCU: STM32F407VGT6

ADC input: ADC3 on PA3

DAC output: DAC1 on PA4

Sampling rate: 100 kHz

ADC and DAC use DMA

Timer-triggered ADC sampling

No EQ, filters, or other audio processing in the current test

The problem:

The input signal passes through the system, but the DAC output contains occasional short glitches or spikes. Grounding the ADC input makes the glitches disappear or become unnoticeable. Changing the compiler optimization level also changes their frequency.

I've already tested different buffer configurations and DMA arrangements. Some changes improve the result, but I haven't identified the root cause.

What I'm looking for:

Is there an experienced STM32 developer who can review my existing code, identify the underlying problem, and help produce a reliable, verified implementation?

I'm particularly interested in checking:

ADC triggering and DMA timing

DMA buffer handling and data alignment

ADC-to-DAC sample transfer

Possible race conditions or missed samples

Any other potential source of the glitches

I can provide my current main.c, stm32f4xx_hal_msp.c, and stm32f4xx_it.c, along with oscilloscope observations and details of the tests I've performed.

I'm not looking for random code changes or guesses. I'd like to identify the actual cause and verify the solution through testing.

If you have relevant STM32F4, DMA, or embedded audio experience, I'd appreciate your help.

Thank you!

Hi everyone,

I'm learning embedded systems and I want to practice on real hardware.

I'm looking for used parts, not new ones.

What I need:

- STM32 boards — Blue Pill, Black Pill, Nucleo, Discovery, anything

- Sensors — temperature, humidity, IMU/accelerometer, ultrasonic, IR,

light, gas, pressure

- Extras if you have them — ST-Link programmer, USB-TTL adapter,

breadboard, jumper wires

Used and old is fine. Bent pins, no box, no cable — no problem.

I only need the boards to work.

I'm in [Your City], UAE. I can pick up locally or pay for shipping.

Tell me what you have and your price. If you have a box of old parts

sitting around, I'm happy to take it.

Please comment or DM me. Thanks!

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I have been wondering who does that to a person and how do I defibulate the microchip? This happned in 2024.

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[https://github.com/Engineer-By-Mistake/test\\_lfr\](https://github.com/Engineer-By-Mistake/test_lfr)

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I checked boot0, boot1 both are tied to 10k pull down nRST is pulled up with 10k

I tried with both HSE and LSE. Same behaviour.

It only boots once when I use SWD to flash after power cycle its dead.

When i upload through DFU it's doesn't boot even once.

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The schematic is also referenced from pixracer fmuV4.

I am a newbie here, please shared some light.

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Hi there

I am building a simple PLC using a Backpill board, development scenario includes:
PLC power supply (regulated 5v)
On board USB for console
STLInk V2 dongle for programming

PLC Power suplly i tied to 5V blackpíll rail thoruh a schottky to not compete with usb power (USB power as per WeAct diagram has its own diode for same purpose)

When only USB is connected everything goes roght: run, debug, (i.e. 411 chip flashing is OK) but as soon as I connect also PLC supply, programmer gets all 1s from read operation...
I ve checked loop grounding, st link speeds and all mos-likely electrical factprs (alse reduces programmer speed) but nothing changes.

Any suggestion ????