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stm32 nucleo F401 官方例程print,wait() 函数死掉。

#include "mbed.h"

//------------------------------------

// Hyperterminal configuration

// 9600 bauds, 8-bit data, no parity

//------------------------------------

Serial pc(SERIAL_TX, SERIAL_RX);

DigitalOut myled(LED1);

int main() {

  int i = 1;

  pc.printf("Hello World !\n");

  while(1) {

     wait_ms(200);    改为这个函数可以正常运行。但是使用

wait(1);  程序就死在这里面。

      pc.printf("This program runs since %d seconds.\n", i++);

      myled = !myled;

  }

}