Quadrature output(dsPIC)

Hi Can anybody help me out with the problem below. i am supposed to create standard quadrature o/p (2 or 3 oututs, A B and RM) from PWM or outputcompare pins of a dsPIC 30F3010 or dsPIC 30f3011 The preferred frequency could be in the range of 1Mhz or a bit lesser. The timing parameters for these outputs will be obtained to 2 Inputcapture modules in the dsPIC from the outside analogue world. Can we create this output at good resolution (around 0.1um resolution) when the linear change is around 1m/s? dsPIC is running at 30Mhz Fcy

Many thanks

Sandeep

Can anybody help me out please!!

I am not sure I understand what you are trying to do.

Do you want to

1. simulate quadrature output - generate quadrature A/B output signals?

1. Read

- two quadrature encoders

- linear change 1 m/s

- 1 MHz sample rate

- interpolate changes to 0.1 m/s

- simulate quadrature A/B outputs from the interpolated 0.1 m/s

To figure out how to simulate quadrature outputs, look at and understand the methods for decoding quadrature encoder decoding in software. There are software encoder algorithms either in a Microchip application note or a posting on piclist.

Try using google or your favorite search engine to search on "software quadrature encoder decoding"