Read the CPU hits 100% in the FIFO usage

I have a PC in real-time with a card of RIO 7833R. I write the values that I read a microphone in a FIFO at a sampling rate of 4 kHz.The length of the FIFO is 2048. The PC in real-time, when I call 'FIFO read' function to read say 400 data samples, the use of CPU time real PC hits 100%. Why is it so? The function 'Read FIFO' is placed inside a while loop.

Thank you

Prashant

Hi Prashant,

Reading the FIFO is a method of querying, so if the number of elements specified to read are not available when the method is called, it queries the FPGA until they are.  This causes the CPU to 100% usage. You can find more information on this subject and a way around this here.

Tags: NI Software

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