Hi changyul,
Not sure whether you’re replying to myself or Ignas here. I believe that MAC changes whether we are writing to the SXT (transmit) registers or SXR (receive) registers, so not whether it is channel 0 or channel 1. This is discussed a bit more in this post.
The code you have shown here is identical (aside from the comments) to what Ignas wrote earlier in the thread, so I suspect it should be fine. Setting MAC to 1 and then disabling the DC corrector will disable the DC corrector in the receive chain. Setting MAC to 2 and then disabling the DC corrector will do it for the transmit chain. So the code you have there should disable the DC corrector in both the transmit and receive, but I suspect for one of the channels.
Take the above with a grain of salt as I by no means know what I am talking about!
EDIT: I was slightly incorrect in what I said above, see Ignas’ post below: