Sean Wang

1.Should I connect all Analog Discovery 2's ground to my development board? or one ground to be connected is ok? 2.I already sperate all wires connection, but the spike still appears. 3.Twist the signal wires with a ground wire. Did you mean this one? If so, can I do it with dupont line or it has to use special wire? And which side should I use twist wire? The Master side or oscilloscope side or both? By the way, I observe chip select line from oscilloscope and there is the noise on the ground(one ground on Analog Discovery 2 already connected to my device and all wires are separated).

I use CY8CKIT-059 as master and esp8266 as slave. Master can transmit data to slave via SPI correctly and there are the spikes no matter ground of Analog Discovery 2 is connected to the system.

I use Analog Discovery 2 to analyze SPI line and there is an abnormal spike during SS is set to low. How do I elimenate it?