Spurious CS glitches on CS line for imx6 SPI interface

[MikeS]

@alex.tx and @GlenM, I think the root cause of this issue might be the same as the root cause of this other topic, which is that the GPIO library is not thread-safe on the iMX6. More testing is required to confirm that.

Can SODIMM 184 be used as a GPIO in the Colibri iMX6DL?

@alex.tx I’m using WinCE image 1.8 and BSP version 2.6 I think I’ve found the root cause. I found that pin 184 behaves perfectly well if I set it or clear it using the GPIOconfig tool without having my firmware running. That made me believe that pin 184 can be used as a GPIO in the Colibri iMX6DL, as you just confirmed in your last message. On a hunch I wondered if the GPIO library is not thread-safe so I added a mutex to protect calls to Gpio_SetLevel() and Gpio_GetLevel(). Our firmware only …