How to store more sampling data in the external mode of C2000 launchpad

Question

I want to store more data in the scope to see the entire period of a sine wave ,which means I need at least the 0.02s period of data to do so, but as the sampling rate is limited to 20HZ, so can we store the data of the whole period?

Answer 1

The 20 Hz Rate setting is the minimum refresh rate to get a new set of data.  It does not have to do with the sample times of the data set itself.  The minimum sample time is defined by the Discretization Step Size when generating code.

There are two approaches you can use to capture more data.  You can use the two approaches at the same time:

1. Increase the Target buffer size.  This is set in the Coder Options + Target + External Mode tab as shown below. I also copied the help description of this parameter.
2. Increase the Decimation setting in the Coder Options + External Mode tab.  The same total number of samples is recorded but the results are downsampled.  For example with a decimation setting of 1 and N samples, data1=[k0,k1,k2,k3,...kN] and a setting of 3 is data3=[k0,k3,k6,...kN*3].

 

Comments

Thank U ,hero!!!!

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