Error: L6218E: Undefined symbol main (referred from entry9a.o).
Error: L6218E: Undefined symbol main (referred from rtentry2.o).
新手建立keil工程文件时出现main未定义出现上述错误;
1.如果main函数书写时出错,把main写mian,会出现
Error: L6218E: Undefined symbol main (referred from rtentry2.o).改回来即可;