Enabling 8 channels of SAADC and sending data via BLE in the most efficient way

RE: Enabling 8 channels of SAADC and sending data via BLE in the most efficient way

Masoumeh — Sat, 15 Jan 2022 11:10:40 GMT

No, the problem is the order of samples in the buffer swap. it means that I set the channel as [1 2 3 .. 8], somehow sometimes I get [3 4 5 ...1 2], or sth like that. I understand that others have the same problem and it can be solved using a PPI as described here. I added this solution but it seems the problem still exists.

RE: Enabling 8 channels of SAADC and sending data via BLE in the most efficient way

Stian Røed Hafskjold — Wed, 12 Jan 2022 13:45:54 GMT

Ok, nice. So the problem is that you don't know which channel the data is coming from?

RE: Enabling 8 channels of SAADC and sending data via BLE in the most efficient way

Masoumeh — Wed, 12 Jan 2022 10:06:01 GMT

Hi, I solve that problem. it was because of my t_ack. I had to set the t_ack as 3us to have 8 channels of ADC with 20kHz sampling. Now I have a new problem :). It seems that the order of data for each channel changes so I can not understand the order of data in some packets. I saw that other people have the same issue. What's the solution here?

RE: Enabling 8 channels of SAADC and sending data via BLE in the most efficient way

Stian Røed Hafskjold — Wed, 12 Jan 2022 09:11:38 GMT

Hi, I'm not sure if I understand the problem.

[quote user=""]I am getting the right value of adc but the frequency is not okay. for example, when I am sampling a 10 Hz signal, I receive a 20 Hz signal. [/quote]

Do you mean that you have a 100 ms sampling interval, but receive data over BLE every 50 ms? Is 50 ms the BLE connection interval?