I’m working on the following equipment:
- Colibri Evaluation Board V3.2B
- iMX7D module
On this board, I have a Linux 4.1.35-v2.7b1 build with Yocto using version 2.7 of Toradex repo.
I’m doing test on SPI, using ecspi3. Its pins are the following:
- SODIMM 86: CS
- SODIMM 88: CLK
- SODIMM 90: MISO
- SODIMM 92: MOSI
I’m watching signals with an Oscilloscope. I can see that perturbations occured on all of the signal. Some of them are more than 2V. (On a 3.3V signal, it is quite important!!)
I can see perturbations even if SPI is not plugged to another device. So they must be comming from the Toradex board.
Does anybody got an idea on what could causes all the perturbation. And how can i remove or at least lower them.