Bring blueberries, 2 tablespoons sugar, and 1 tablespoon water to a simmer in a small saucepan over medium-high; cook 8 minutes or until thickened. Stir in basil. Heat waffle iron to medium-high. Weigh or lightly spoon flour into a dry measuring cup; level with a knife. Combine flour, cornmeal, and baking powder in a bowl. Combine remaining 1 tablespoon sugar, buttermilk, and eggs in a bowl. Add flour mixture to buttermilk mixture, stirring until just combined. Coat waffle iron with cooking spray. Spoon 1/3 cup batter per waffle onto iron. Cook 4 minutes or until lightly browned; repeat with remaining batter. Serve with compote.