CC1310: Sampling 3 channels using ADCBuf

Damian Miller

Part Number: CC1310

Hi,

I am trying to work out the best way of sampling three channels synchronously. As I have come to understand you can only use ADCBuf to sample one channel at a time, in which case this is not overly useful to me since I need to perform some DSP on the synchronised values. Alternatively I can use a timer to generate a regular interrupt then call on a SW interrupt to measure the ADC channels using the ADC functionality, but I feel this may require too many resources and be subject to jitter given the other tasks I am running.

Is there a way of using the ADCBuf to continuously sample three ADC channels in the CC1310?

BR
Damo

over 3 years ago

0 Elin W over 3 years ago

TI__Genius 14845 points

Hi Damian,

If you want to sample multiple ADC channels I'd recommend you use the Sensor Controller which will perform ADC readings for you and dump the results to the main CPU. This means that you don't have to worry about callback and timer delays in the RTOS as the Sensor Controller is its own processor.

If you want to use the ADCBuf driver, you can perform a series of ADC readings by using an array of "conversions", you just need to remember that it will do them one by one. A third option is to use the "normal" ADC driver and perform multiple conversions following each other.

Thanks,
Elin

0 Damian Miller over 3 years ago in reply to Elin W

Prodigy 30 points

Thankyou Elin for you post.

Is there a link to any source available as an example of how to use the Sensor Controller? This sounds like it would be the best option. I have implemented an approach using a Timer to generate a SWI to perform my sampling but there is just too much jitter, due to that it is also running a high-speed communications stack, introducing measurement errors, even after applying filtering.

BR
Damian

0 YiKai Chen over 3 years ago in reply to Damian Miller

Guru 735455 points

You can refer to Sensor Controller SimpleLink Academy.

0 Elin W over 3 years ago in reply to Damian Miller

TI__Genius 14845 points

Hi Damian,

Yes, as YK mentions you can use Sensor Controller Studio and use the Sensor Controller Studio SLA to get started. I'd also recommend you to read the SCS documentation.

Thanks,
Elin

Sub-1 GHz

Sub-1 GHz forum

CC1310: Sampling 3 channels using ADCBuf