【在线等！】ARM 硬件重定向printf问题

只看该作者 · 2013-6-16 11:10

【问题描述】ARM硬件重定向后，单个用底层IO函数SendChar(ch)连续输出字符都可以，用printf("abcdefgh\n")，只打印出了ab，请问高人是什么问题啊，在线等，跪求解决方法!!
【代码】

#include "../../common/drivers.h"



#pragma import(__use_no_semihosting_swi)





/*----------------------------------------------------------------------------

  external functions

 *----------------------------------------------------------------------------*/



struct __FILE 

{

      int32 handle;                 // Add whatever you need here 

};

FILE __stdout;

FILE __stdin;



/*----------------------------------------------------------------------------

  SendChar

  Write character to Serial Port.

 *----------------------------------------------------------------------------*/

int SendChar (int ch)  {



  //while (UARTGetLineStatus(g_pUART0, UART_标志寄存器_THR_EMPTY) == RESET);

  UARTSendData(g_pUART0, (uint8)(ch & 0xFF));



  return (ch);

}





/*----------------------------------------------------------------------------

  GetKey

  Read character to Serial Port.

 *----------------------------------------------------------------------------*/

int32 GetKey (void)  {



  while (UARTGetLineStatus(g_pUART0, UART_标志寄存器_DATA_READY) == RESET);



  return ((int)UARTRecvData(g_pUART0));

}



/*----------------------------------------------------------------------------

  fputc

 *----------------------------------------------------------------------------*/

int fputc(int ch, FILE *f) {

  return (SendChar(ch));

}



/*----------------------------------------------------------------------------

  fgetc

 *----------------------------------------------------------------------------*/

int fgetc(FILE *f) {

  return (SendChar(GetKey()));

}



/*----------------------------------------------------------------------------

  _ttywrch

 *----------------------------------------------------------------------------*/

void _ttywrch(int ch) {

 SendChar (ch);

}



/*----------------------------------------------------------------------------

  ferror

 *----------------------------------------------------------------------------*/

int32 ferror(FILE *f) {

                              // Your implementation of ferror

  return EOF;

}



/*----------------------------------------------------------------------------

  _sys_exit

 *----------------------------------------------------------------------------*/

void _sys_exit(int return_code) {

label:  goto label;           // endless loop

}