tinyusb/hw/bsp/printf_retarget.c

/**************************************************************************/
/*!
    @file     printf_retarget.c
    @author   hathach (tinyusb.org)

    @section LICENSE

    Software License Agreement (BSD License)

    Copyright (c) 2013, hathach (tinyusb.org)
    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 copyright holders 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 COPYRIGHT HOLDERS ''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 COPYRIGHT HOLDER 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.

    This file is part of the tinyusb stack.
*/
/**************************************************************************/

#include "board.h"

#if CFG_PRINTF_TARGET != PRINTF_TARGET_SEMIHOST

#if CFG_PRINTF_TARGET == PRINTF_TARGET_UART
  #define retarget_getchar()     board_uart_getchar()
  #define retarget_putchar(c)    board_uart_putchar(c);
#elif CFG_PRINTF_TARGET == PRINTF_TARGET_SWO
  volatile int32_t ITM_RxBuffer;  // keil variable to read from SWO
	#define retarget_getchar()     ITM_ReceiveChar()
	#define retarget_putchar(c)    ITM_SendChar(c)
#else
	#error Target is not implemented yet
#endif

//--------------------------------------------------------------------+
// LPCXPRESSO / RED SUITE
//--------------------------------------------------------------------+
#if defined __CODE_RED

#if CFG_PRINTF_TARGET == PRINTF_TARGET_SWO
  #error author does not know how to retarget SWO with lpcxpresso/red-suite
#endif

// Called by bottom level of printf routine within RedLib C library to write
// a character. With the default semihosting stub, this would write the character
// to the debugger console window . But this version writes
// the character to the UART.
int __sys_write (int iFileHandle, char *buf, int length)
{
  (void) iFileHandle;

  for (int i=0; i<length; i++)
  {
    if (buf[i] == '\n') retarget_putchar('\r');

    retarget_putchar( buf[i] );
  }

  return length;
}

// Called by bottom level of scanf routine within RedLib C library to read
// a character. With the default semihosting stub, this would read the character
// from the debugger console window (which acts as stdin). But this version reads
// the character from the UART.
int __sys_readc (void)
{
	return (int) retarget_getchar();
}

#elif defined __SES_ARM && 0
#include <stdarg.h>
#include <stdio.h>
#include "__libc.h"

int printf(const char *fmt,...) {
  char buffer[128];
  va_list args;
  va_start (args, fmt);
  int n = vsnprintf(buffer, sizeof(buffer), fmt, args);
  
  for(int i=0; i < n; i++)
  {
    retarget_putchar( buffer[i] );
  }

  va_end(args);
  return n;
}

int __putchar(int ch, __printf_tag_ptr ctx) 
{
  (void)ctx;
  retarget_putchar( (uint8_t) ch );
  return 1;
}

int __getchar()
{
  return retarget_getchar();
}

//--------------------------------------------------------------------+
// KEIL
//--------------------------------------------------------------------+
#elif defined __CC_ARM // keil

struct __FILE {
  uint32_t handle;
};

void _ttywrch(int ch)
{
  if ( ch == '\n' ) retarget_putchar('\r');

  retarget_putchar(ch);
}

int fgetc(FILE *f)
{
  return retarget_getchar();
}

int fputc(int ch, FILE *f)
{
  _ttywrch(ch);
  return ch;
}

//--------------------------------------------------------------------+
// IAR
//--------------------------------------------------------------------+
#elif defined __ICCARM__ // TODO could not able to retarget to UART with IAR

#if CFG_PRINTF_TARGET == PRINTF_TARGET_UART
#include <stddef.h>

size_t __write(int handle, const unsigned char *buf, size_t length)
{
  /* Check for the command to flush all handles */
  if (handle == -1) return 0;

  /* Check for stdout and stderr (only necessary if FILE descriptors are enabled.) */
  if (handle != 1 && handle != 2) return -1;

  for (size_t i=0; i<length; i++)
  {
    if (buf[i] == '\n') retarget_putchar('\r');

    retarget_putchar( buf[i] );
  }

  return length;
}

size_t __read(int handle, unsigned char *buf, size_t bufSize)
{
  /* Check for stdin (only necessary if FILE descriptors are enabled) */
  if (handle != 0) return -1;

  size_t i;
  for (i=0; i<bufSize; i++)
  {
    uint8_t ch = board_uart_getchar();
    if (ch == 0) break;
    buf[i] = ch;
  }

  return i;
}

#endif

#endif

#endif // CFG_PRINTF_TARGET != PRINTF_TARGET_SEMIHOST