External ADC and BLE not able to work together

[SK]

Hi Everyone, 

I am having this issue where i am not able to get ADC and BLE working together. 

I am using external ADC and i am using BLE app uart as the base to develop my application. I am using Segger IDE, SDK version 14.20 and SD v5.0

If i use ADC module as it is without BLE, it is working perfectly well. Channel multiplexing works fine too. 

If i use BLE to send dummy data, that works fine too. Problem comes when i try to use these two together. I notice that reading from the ADC itself is sometimes incorrect and its always that the AD count reaches maximum of 32768. 

Only thing that we changed in the HW design was to remove external 32kHz crystal. So, i am using internal RC as my clock source. Could this be a source of problem? 

Please let me know. Let me know if you require more information. 

Thank you.

[awneil]

What debugging have you done to find out what's happening?

As it's an external ADC, you must have interface lines that you can look at - are they still behaving correctly ... ?

SK said:

Only thing that we changed in the HW design was to remove external 32kHz crystal. So, i am using internal RC as my clock source. Could this be a source of problem? 

Surely, you could easily answer that by re-running your code that just has the ADC without the BLE - does it still work?

[SK]

Well, i am trying to isolate the issue.. not getting to anything. Yes, i have run the ADC without the BLE and it works.

ADC is utilizing SPI master interface and that is also running alright to me.