Port what had got it right how always go wrong

CodePudding user response:

My suggestion: 1. The closed software, uprooted port to reconnect. 2. Press the reset button on the arduino; 3. Check the procedure if there is a missing punctuation or parentheses; 4. Copy the error to the baidu to see whether there is a solution; 5. Each time you upload to compile error free upload again, each operation only once, don't try so hard,