High CPU Load

[thmang82]

Hi there, while using your decode code to write a node server running RFSwitch, I discovered with top that RFSwitch is using 50% CPU on my Pi Zero W.

Any chance to reduce the CPU usage?

I am not familiar with Go, so no idea if this is solely related to SPI, or if there is any way you can insert some tiny wait or so in the Go code ...

[thmang82]

I found a way to reduce the CPU load a bit:

in radio.go in mainLoop() add the following just before "} else if status == 0x60 {": time.Sleep(7 * time.Millisecond)

The line will let the main loop that process the data sleep a bit after every data processing (in case status == 0x10)

This are the tested settings:

• without sleep => 50% CPU on PiZeroW
• 5 ms works => 23% CPU on PiZeroW
• 7 ms works mostly, very sporadic re-sync, but no press lost at all => 18% CPU on PiZeroW
• 8 ms sporadic re-sync, still no real press lost => 16% CPU on PiZeroW
• 10 ms leads to re-syncs of the SPI channel