Sign in

Search adsp

Subscribe to adsp

adsp by Keywords

Discussion Groups

Discussion Groups | Analog Devices DSPs | encoder interface unit

Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).

Post a new Thread

encoder interface unit - Hany Ferdinando - Oct 21 8:30:00 2003

Hi all, I used 2199x Encoder Interface Unit to estimate the velocity of motor shaft. My idea is I generate 1ms interval of interrupt (using EIU loop timer) and read the counter value then reset it. I got strange result when I tried to calibrate the value. According to the manual, the value read from the register is 4 times the value from the encoder. Anyone has an idea about this phenomena? regards, Hany

(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )

Re: encoder interface unit - Steve Holle - Oct 21 14:28:00 2003

What they are saying, I think, is that the EIU counts the rising and falling edges of the Phase A and B signals. If you have a 128 cycle encoder you will actually read 512 counts per revolution.

At 02:30 AM 10/21/2003, Hany Ferdinando wrote:

Hi all,

I used 2199x Encoder Interface Unit to estimate the velocity of motor shaft. My
idea is I generate 1ms interval of interrupt (using EIU loop timer) and read
the counter value then reset it. I got strange result when I tried to calibrate
the value. According to the manual, the value read from the register is 4 times
the value from the encoder.

Anyone has an idea about this phenomena?

regards,
Hany _____________________________________
/groups.php3

-------------------------- Steve Holle Link Communications, Inc. 1035 Cerise Road Billings, Montana 59101-7378 406.245.5002 s...@link-comm.com --------------------------

(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )