TMS320C6654: Charting and decimation

LazyHD

Part Number: TMS320C6654

Hello,

I am sampling some signal and I need to collect 100,000 samples. Once the data is collected and processed I need to display it on an LCD (among other things).

The LCD resolution is 800x480px. So in order to show the data I believe I need to do some form of decimation to go from 100,000 to 800 on the maximum zoom-out level.

Is there a better way to approach the above ?
Should I use a FIR filter and pick the Nth element for decimation ?
In the DSP lib any function to implement decimation/downsampling ?

Hardware Summary:

TMS320C6654 with ADC input. LCD controller is external connected to the DSP using SPI.

Any optimization or tips are highly appreciated. Thanks

over 7 years ago

0 Yordan Kovachev over 7 years ago

TI__Guru**** 161600 points

Hi,

Could you share which Processor SDK RTOS are you planning to use?

Best Regards,
Yordan

0 LazyHD over 7 years ago in reply to Yordan Kovachev

Expert 1060 points

Yes, sorry about that.
I am using TI-RTOS for C665x. processor_sdk_rtos_c665x_5_02_00_10 to be specific.

0 Rahul Prabhu over 7 years ago

TI__Guru** 116830 points

Instead of decimation or down sampling, the other option is to window the samples and plot only the samples that appear in the window and then using a slider to plot the other samples.

We don`t have any decimation functions in DSPLIB. You might want to look for some open source library that provides this functionality:
dspguru.com/.../

Regards,
Rahul

0 LazyHD over 7 years ago in reply to Rahul Prabhu

Expert 1060 points

Thank you, I will look into the suggested library.
Windowing in the default mode, but then user can zoom in and out and that is where I will need decimation.

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TMS320C6654: Charting and decimation