OpenWrt Forum Archive

Topic: Using GPIO as a PWM source...

The content of this topic has been archived on 5 Apr 2018. There are no obvious gaps in this topic, but there may still be some posts missing at the end.

Post #1
mrpacket
9 May 2006, 06:29

I was contemplating using the GPIO as a source to generate a Pulse Width Modulated Signal.  I am going to use this as a way of controlling some small DC motors..

Essentially a repeating string of bits.  ie  0,1,0,1,0,1,0,1,0,1,0 will be 50%, and 0,0,1,0,0,1 33% etc etc.

I was wondering how fast the GPIO can be operated? ie, how many transistions per second can you make it run..

ANyone got any ideas?

Post #2
TheRoDent
9 May 2006, 22:59

Well, the GPIO's can be twiddled fast enough to get a few hundred KB/s read speed from an SD-Card, so I think it should handle your application just fine.

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