DCA1000EVM: How to capture raw data frame by frame from DCA1000EVM

I fllow the post to real-time capture rarw data by DCA1000EVM:

https://e2e.ti.com/support/sensors/f/1023/t/826017

and use the example code in

'C:\ti\mmwave_studio_02_00_00_02\mmWaveStudio\Clients\AR1xController\api.h'

The example code shows:

int8_t path[20] = "D:\\adc_data_DCA.bin";
retVal = StartRecordData(path, 1);
// TODO: Handle return error value of above API call

// To stop the capture
retVal = StopRecordData();

in order to record data, I insert sleep() function between start and stop,

but It can't guarantee that I capture data frame by frame.

e.g. I use sleep(20000), I can capture approximately 99.7 frame data rather than 99 frame or 100 frame.

So I want to know there is an api or a way to guarantee that I capture data frame by frame,

or I need drop the decimal part in post progress.