nrf5340 multiple GPIOTE channels assigned same pin

[kpreiss]

In the nRF5340 user manual section 7.14.3, there is a note regarding assigning the same pin on more than one GPIOTE channel can result in unpredictable behavior.  We have implemented logic capturing the rising and falling edges of a tach signal using a single pin on two GPIOTE channels triggering a timer capture on two different capture channels and it appeared to work ok.

Are there specific timing conditions where unpredictable behavior may occur?  For example, does unpredictable behavior occur if the rising and falling edges occur within TBD usec?

 

Thanks,

Kurt

[ovrebekk]

Hi Kurt

We have never seen problems when connecting two GPIOTE channels to the same pin in input (event) mode. 

It is mainly if you connect multiple GPIOTE channels in output (task) mode that you will get unpredictable behavior. 

Best regards
Torbjørn