(转）关于stm32报错Library reports error: __use_no_semihosting was requested

编译环境:KEIL5 

报错代码：Error: L6915E: Library reports error: __use_no_semihosting was requested, but _ttywrch was referenced

解决办法

找到usart.c文件中的_sys_exit函数

_sys_exit(int x) 
{ 
    x = x; 
} 

大约47行，在他后边加入

//__use_no_semihosting was requested, but _ttywrch was 
_ttywrch(int ch)
{
ch = ch;
}

即可解决问题！

转载至https://blog.youkuaiyun.com/r709651108/article/details/51790322