Introduction - If you have any usage issues, please Google them yourself
In the use of general-purpose machines pc serial debugger, sending the characters can be displayed on the LCD screen, while single-chip microcomputer can receive loopback characters Note: program compiled, a warning prompt will appear, is due to have no function calls and have been a number of procedure calls a function, in this does not affect the experimental results, there is no need to care about suspense.