How to sequentially read from multiple ADC pins?

[hari911]

Hi,

I have gone through the saadc example program supplied along with SDK15. But the issue is that, the example features a single channel ADC read. I tried to modify this example program but whenever i try to change the ADC channel, it hits a hard fault.

My requirement is to read 2 ADC channels, (say AN0 and AN1) every 10 mSec.

Thanks and regards,

Hari

[Jørgen Holmefjord]

Hi,

Do you want to sequentially read the two channels manually, or do you want to use the scan mode in SAADC peripheral to sample both channels for you?

For second alternative, you can reference this example on our GitHub. If you want to implement sequential read, you simply need to change the analog input of the channel after each read.

Please provide more details on what error you are getting.

Best regards,
Jørgen

[hari911]

Hi  Jørgen Holmefjord,

I have gone through the GitHub ecample that you have provided and now i got the multi channel ADC section working.

Now i am trying to integrate the ADC program to HID mouse example and it builds without any error. Here I included the ADC initialization after all other initializations in the BID example program.

But when control executes "saadc_sampleing_event_init();" I get a "<error> app: Fatal error" in RTT Viewer.

What could be causing this error?

Is it something related to timer?

Thanks and regards,
Hari

[Jørgen Holmefjord]

I do not know what you are doing inside saadc_sampleing_event_init, but you need to debug the application and find which function is returning an error, and what the returned error code is.

[hari911]

Hi  Jørgen Holmefjord,

Thanks for the your time and support which I really appreciate.

I was on that program and sorted out the issue. As suspected, bot HID and ADC was using same timer instance and that caused all the fuzz.

Once again thanks a lot.

Hari