Reading encoder using PRU

GoogleGroups
1

Hi everyone,

My project requires reading an encoder pulse (1,000,000+ counts/sec) and pulsing a laser (or not) in response to that count. I was wondering if anyone has a way to read in the encoder counts from the eQEP into the PRU in a manner that results in little latency. I am leaning towards using an interrupt associated eQEP0 but I am not quite sure how to implement this. Any help would be greatly appreciated.

CJ

2

No change! In order to use the eQEP in the PWMSS, you have to go over OCP port with at least 3 cycles latency. The latency may get bigger, it depends on the trafic → not realtime.

I see a chance to realize the task by counting by the PRU eCAP module or directly by a PRU-GPIO-IN, and controlling the laser by a PRU-GPIO-OUT.

BR