Classic/Legacy CodeWarriorのトピック56F8323 Quadrature Decoder Setup

56F8323 Quadrature Decoder Setup

v_dave — Sat, 02 Jun 2007 04:40:08 GMT

Hello All,

As you may have seen from some of my earlier posts I am working on a Motor Control project. I am using the 56F8323 and I plan to use the Quadrature Decoder module.

In section 12.1 of the 56F8300 Peripheral User Manual Rev 9 it states that the maximum count resolution is 4x the input signal. Does this mean it will work as a 4x Quad Decoder? i.e. if I have a decode wheel with 360 marks then in 4x mode it would count to 1440.

How do I set the Quad Decoder module to the different resolutions (1x, 2x, 4x)? I don't see any reference in chapter 12 or Chapter 16 Quad Timer. I also don't see any settings in the Bean when using CodeWarrior.

Does anyone have any good tips on how to set this up?

Re: 56F8323 Quadrature Decoder Setup

admin — Mon, 11 Jun 2007 15:35:39 GMT

QuadDecoder is a module changed internal state on the both edges (falling and raising) of two out-of-phase pulses. So its resulting resolution is 4.
If you need different resolutions you can use timers for counting external signals. For example - using Edge Count Mode - resulting resolution will be 2x. Using simple Count Mode - resolution will be 1x.

Re: 56F8323 Quadrature Decoder Setup

v_dave — Mon, 11 Jun 2007 23:33:31 GMT

Hello,

Thanks for the response.

My questions stems from using a Qudrature decoder module in a competitors MCU. With thiers you select 1x, 2x or 4x mode. so when I didn't see that option spelled out with the 56F8323 then I just wanted to make sure what mode is the default.