STM32串口函数中尝试用scanf函数实现回显，但是编译出错，求帮忙。

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楼主 | 2019-11-14 12:16 | 只看该作者回帖奖励

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scanf, STM32串口, 编译, 函数, USART

int main(void)
{
      uint8_t Str[80] = {0};
      SZ_STM32_COMInit();

      while(1)
      {
               scanf(&quot;%s&quot;, Str);
            printf(&quot;\n\r 输入的字符串是: <%s>\n&quot;, Str);
      }
}
int fputc(int ch, FILE *f)
{
/* e.g. write a character to the USART */
USART_SendData(USART1, (uint8_t) ch);

/* Loop until the end of transmission */
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);

return ch;
}

int fgetc(FILE *f)
{
      int ch = 0;

while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);

ch = (int)USART1->DR & 0xFF;

putchar(ch); //回显

      return ch;
}
我是这样编写的，但是编译出错。
..\Output\STM32-DEMO.axf: Error: L6218E: Undefined symbol __vfscanf_char_file (referred from __0scanf.o).
..\Output\STM32-DEMO.axf: Not enough information to list image symbols.
..\Output\STM32-DEMO.axf: Finished: 1 information, 0 warning and 1 error messages.

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