Providers of DPA funds typically do not have any stipulation regarding your past credit history. Many will require you to be a first time home buyer though, but check with the organization or institution that is providing those funds as they are the gate-keepers and rule makers when it comes down to that.
You will need to wait 2 years from the discharge date of your CH. 7 before you are eligible for an FHA loan to purchase a home however, so keep that in mind.
There are no additonal requirements regarding the BK for a DPA. You are good to go after the required waiting periods. Here is a quick rundown.