Unable to read proper value of AI Signals

[Prince17]

Hi,

I have created a FPGA Personality custom IO project in veristand. But I'm unable to read the correct value of AI Channels.

Steps that I've followed:

1. Created the LabVIEW FPGA Project (as per the defined template)

2. Generated the bitfile.

3. Coded the fpgaconfig file where I have defined the IOs.

4. Loaded this file under FPGA in the Veristand.

I'm able to control the AO but the values of the AI channels are not correct. For eg, It should read constant 5V but instead of it's reading a complete different signal. Image of the signal is attached for the reference.

Kindly help me out if there is something that I'm missing or points that should be added.

[Jiri_K]

Typically the issue is in the scaling in FPGA config file

https://zone.ni.com/reference/en-XX/help/372846M-01/veristandmerge/creating_custom_fpga_configuratio...

Understanding Scale and Offset

[Prince17]

At the moment, I have placed the following script in the config file:

<FXPI32>
     <Name>Hydraulic Oil Temperature (6.0)</Name>
     <Description>Analog input channel AI0 on the NI-9205 in Slot 1.1.</Description>
     <Category>Input\Analog_Voltage</Category>
     <Unit>Volts</Unit>
     <Symbol>AI</Symbol>
     <FXPWL>20</FXPWL>
     <FXPIWL>5</FXPIWL>
</FXPI32>

Is there anything missing in this? Meanwhile I can study the article you have provided.

Thanks a lot.

[Jiri_K · Accepted solution]

9205 should go with 26/5

<FXPI32>
<Name>AI0</Name>
<Description>Analog input channel AI0 on 9205 Module.</Description>
<Category>Input\Analog</Category>
<Unit>Volts</Unit>
<Symbol>AI</Symbol>
<FXPWL>26</FXPWL>
<FXPIWL>5</FXPIWL>
</FXPI32>

I suggest to install https://github.com/NIVeriStandAdd-Ons/NI-VeriStand-FPGA-Project-Tool if you didn't. There are examples for some of the modules...

~Jiri