Problem with the analog input acquisition in labview fpga 8.5.1 and CRIO

[srikrishnaNF]

 Hello all,

   I am using NI CRIO 9104 RT controller with 9014 FPGA chassis.I am using an Analog input module 9205.My problem is with the acquisition.I am using a

function generator which generates some sine wave of -1 to 1 ,5hz to125khz sine signal and i have connected to 9205 in rse mode.In FPGA vi i had placed the I/O node and placed an indicator(data type FXP).If i connect the i/o node to a chart or graph,i am not able to see the output.?How this problem can bbe solved

Next i had placed a FIFO in DMA transfer mode of depth 1023 which will accept the U32 datatype,so i did some manipulation as mentioned in a tutorial.

Now in RT VI i am reading the same data from the buffer in U32 and doing the reverse manipulation i am able to view the data.Now the problem is ..if i am

increasing the frequency of the input signal,the data is completly lost ?How can i overcome this problem...

thanks in advance,

srikrishna.J

Analysis Engineer,

Neurofocus

[MathBoda]

Difficult to see where is the problem ....

Be sure you are doing a good RT system by grabing reference design examples

Don't forget to specify the DMA FIFO size in the RT code

Doesn't matter the size of the DMA size under the FPGA project explorer.

Upload your code, You will get answers...

Mathieu