Let's get started!
In this sentence "get started" means that "to begin or start".But as far as I know "get + v-ing" has that meaning too .Such as in the following examples :
We have to get moving now.
It's getting dark.
So can we use "get+past participle" to mean "to begin or start" ? or "get started" is just an exception ? I mean can I say
I have to get written.
instead of
I have to get writing.