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P
ProgBoy
Visitor II
February 23, 2025
Question

Unstable logical state on every I/O pin

  • February 23, 2025
  • 2 replies
  • 1643 views

Hi Everybody! 

I confronts a very interesting problem at my project. Details above:

Hardware: NUCLEOG071RB

Attached the IOC configuration. Control the SPI CS pin by software. I got small 4-8us signal spikes all  GPIO, SPI, I2S pins. SPI and I2S powered by DMA. 

I tried connect serially 33K resistor with less success. The 3.3V power line is stable. Jumper wire length 10 cm. 

Any idea what I did wrong? pics2.png

 

pics1.png

 

2 replies

AScha.3
AScha.3
Super User
February 23, 2025

Hi,

>Any idea what I did wrong? 

How about your ground connections ? (spikes on all lines = typical for bad/long/indirect ground connection)

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TDK
TDK
February 23, 2025

Looks like all glitches are positive-going pulses. Is your logic level set to 3.3 V and not 1.65 V? You can filter out glitches on each channel.

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