Use a dedicated logic probe or 10:1 oscilloscope probes. They will put less load on the circuit.
SPI is normally pretty strong against that kind of influence. Show us your circuit, please. There may be another problem.
Use a dedicated logic probe or 10:1 oscilloscope probes. They will put less load on the circuit.
SPI is normally pretty strong against that kind of influence. Show us your circuit, please. There may be another problem.