Unstable logical state on every I/O pin

[ProgBoy]

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? 

 

 

[AScha.3]

Hi,

>Any idea what I did wrong? 

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

[TDK]

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.