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irda problem

Altera_Forum
Honored Contributor II
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Hi, i'm trying to implement an IR interface with FPGA altera de2, cyclone ii. 

the IRDA ic is hsdl-3201. 

 

after looking with osciloscope, i realized that ir signal is modulated by 38khz pulse (with D.C about 90%) 

so i have built a clock with frequency ~38khz , so sampling at this rate to generate demodulated signal. 

 

after that, try to read the trasmit data and count the time the signal is high and low. it doesn't work  

and i guess there's something basic i don't do /understand.  

could someone advice plz.
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