Triangle Wave Generation in NP PXIe-7821R FPGA

I am a novice and I have only recently started to learn about LabVIEW and NI PXIes.

In my lab we have a NI PXIe-1078 (Chasis), NI PXIe-8840, NI PXIe-7821R and NI PXIe-6723. I am trying to generate a 1kHz triangle wave using NI PXIe-7821R. But I the VI placed in the NI PXIe-7821R does not support any triangle wave vi. The only waveform vi available are sine wave and square wave vi in the FPGA control menu. 

The added requirement is that I do not want to generate a triangle waveform (waveform data or dynamic data) but I just want to get the triangle waveform in the form of double data.

How can I generate a 1kHz wave in this case?