uart-putchar.c

/*
 * Copyright (c) 2006, Swedish Institute of Computer Science
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
#include "contiki.h"
#include "dev/uart0.h"
#include "dev/uart1.h"
#include "dev/slip.h"
 
#include <string.h>
/*---------------------------------------------------------------------------*/
#define SLIP_END     0300
#undef putchar
/*---------------------------------------------------------------------------*/
int
putchar(int c)
{
#if SLIP_ARCH_CONF_ENABLED
  static char debug_frame = 0;
 
  if(!debug_frame) {            /* Start of debug output */
    UART_WRITEB(SLIP_END);
    UART_WRITEB('\r');     /* Type debug line == '\r' */
    debug_frame = 1;
  }
#endif /* SLIP_ARCH_CONF_ENABLED */
 
  /* Need to also print '\n' because for example COOJA will not show
     any output before line end */
  UART_WRITEB((char)c);
 
#if SLIP_ARCH_CONF_ENABLED
  /*
   * Line buffered output, a newline marks the end of debug output and
   * implicitly flushes debug output.
   */
  if(c == '\n') {
    UART_WRITEB(SLIP_END);
    debug_frame = 0;
  }
#endif /* SLIP_ARCH_CONF_ENABLED */
  return c;
}
/*---------------------------------------------------------------------------*/
#if defined(__GNUC__) && (__GNUC__ >= 9)
/* The printf() in newlib in GCC 9 from Texas Instruments uses the
 * "TI C I/O" protocol which is not implemented in GDB. The user manual
 * suggests overriding write() to redirect printf() output. */
int
write(int fd, const char *buf, int len)
{
  int i = 0;
  for(; i < len && buf[i]; i++) {
    putchar(buf[i]);
  }
  return i;
}
#endif
/*---------------------------------------------------------------------------*/