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Original question:

[FAQ] Inductive sensing FAQ - Frequently asked questions

LDC1614EVM: Set Data Streaming Sample Rate

6092301
Prodigy 10 points
Part Number: LDC1614EVM


Hello,

I'm controlling the LDC1614EVM using a python script and want to be able to control the Data Streaming Sample Rate.

In the Sensing Solutions EVM GUI Under Data Streaming you have the following options:

- EVM output Rate (Infinity ms = 0.0Hz)

- Add sample to graph every (x) ms

Is this controlled at the GUI side or is the Sample rate lowered on the MSP430 side?

I'm using `4c 05 01 00 06 01 00 01 04 30 2a 90`  to start the data stream, but when changing the sample rate there is no change in the command. In the EVM GUI I'm able to get 400pts/s using python I only get 100pts/s so I looks like the sample rate is lower.

It also looks like the FAQ is incomplete. For example If I enable channel 2 on the configuration page it sends: `4c 13 01 00 04 2a 1b a2 0c 60` and read register start with `4c 12` and not `4c 14` as described in the FAQ.

  • 0
    TI__Expert 3665 points

    Hi 6092301,

    Thanks for reaching out, The New Data Sample Rate allows the user to choose when new data is added to the graph. Selecting EVM Output Rate will display data on the graph as fast as is available from the EVM. This should not be confused with the actual sampling rate of the device on the EVM which could be different. The Add sample to graph every ... ms will add a new sample to the graph at the specified rate.