When set as Auto, the component will chose the most optimal sense clock source in the following priority:
1. You can try calculating in this order and try to figure out the best fit.
2. Or, you can use CapSense_GetParam(CapSense_BTN0_SNS_CLK_SOURCE_PARAM_ID, &value) after calling CapSense_Start() to read the sense clock source
Please refer Access and Modify CapSense Register Map in Firmware – KBA2226674 to know how to access the CapSense data structure.
Thank you for your answer.
I can confirm which clock source is selected using the API.