We are trying to configure the NI USB-6229 to supply a digital output as well as to perform analog acquisitions at a fixed interval. The attached diagram loosely depicts what we are trying to accomplish.
We would like to generate a non-uniform digital waveform that drives a digital output. The source of the waveform is a digital FIFO of “N” 1-bit samples. The samples are clocked out to digital output “DO” at 1Khz. The clock source MUST be a hardware timer as the timing must be reasonably accurate. The digital output FIFO would be filled before the 1Khz clock was started and would be configured to wrap-around once the FIFO pointer had reached the last sample.
We would also like to use the same clock source to trigger ADC acquisitions which would then feed into another FIFO that can be read by the LabView VI. Ideally we’d like to configure 3 ADCs in the same fashion. However, it would suffice to know how to wire up the first ADC.
All of the timing-specific control must be inside the ‘6229 as the PC cannot keep up with this data rate. The PC should be able to read data out of the output FIFO before it fills.
