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IWR1642: How to switch SOP (sense-on-power) mode ?

Part Number: IWR1642

It seems that SOP (sense-on-power) shall be controlled by external IC (ex. XDS110).

My understanding is that required sequence is as follows:

  - Set SOP mode (ex. flashing mode) with the external IC via serial.

  - Reset IWR 1642, then it can receive new flash image.

If we can control SOP without external ICs, and control it with software via serial I/F,

it will be very convenient for us. Please let us know the procedure if possible.