VGComBoard_3120_Demo/midware/utilities/printer.c

#include <LowLevelIOInterface.h>
#include "lpuart.h"

/******************************************************************************
*
* Copyright 1998-2017 IAR Systems AB.
*
* This is a template implementation of the "__write" function used by
* the standard library.  Replace it with a system-specific
* implementation.
*
* The "__write" function should output "size" number of bytes from
* "buffer" in some application-specific way.  It should return the
* number of characters written, or _LLIO_ERROR on failure.
*
* If "buffer" is zero then __write should perform flushing of
* internal buffers, if any.  In this case "handle" can be -1 to
* indicate that all handles should be flushed.
*
* The template implementation below assumes that the application
* provides the function "MyLowLevelPutchar".  It should return the
* character written, or -1 on failure.
*
******************************************************************************/ 

#pragma module_name = "?__write "

int MyLowLevelPutchar(int x)
{
  //comSendChar(COM1, x);
  LPUart_SendData(M0P_LPUART0, (uint8_t)x); //²éѯ·½Ê½·¢ËÍÊý¾Ý
  
  return x;

}

 size_t __write(int handle, const unsigned char * buffer, size_t size)
{
    /* Remove the #if #endif pair to enable the implementation */
#if 1

  size_t nChars = 0;

  if (buffer == 0)
  {
    /*
     * This means that we should flush internal buffers.  Since we
     * don't we just return.  (Remember, "handle" == -1 means that all
     * handles should be flushed.)
     */
    return 0;
  }

  /* This template only writes to "standard out" and "standard err",
   * for all other file handles it returns failure. */
  if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR)
  {
    return _LLIO_ERROR;
  }

  for (/* Empty */; size != 0; --size)
  {
    if (MyLowLevelPutchar(*buffer++) < 0)
    {
      return _LLIO_ERROR;
    }

    ++nChars;
  }

  return nChars;

#else

  /* Always return error code when implementation is disabled. */
  return _LLIO_ERROR;

#endif

}