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stdio.c 7.11 KiB
/**
* @file stdio.c
* @brief Low level implementation of standard I/O functions
*/
/*******************************************************************************
* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
*
* $Date: 2018-12-18 21:37:22 +0000 (Tue, 18 Dec 2018) $
* $Revision: 40072 $
*
******************************************************************************/
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
/* Device and Board specific includes */
#include "mxc_config.h"
#include "mxc_sys.h"
#include "board.h"
#include "uart.h"
/**
* Address of the UART registers for the console output.
* @note CONSOLE_UART must be defined in board.h.
*/
#define MXC_UARTn MXC_UART_GET_UART(CONSOLE_UART)
/**
* UART FIFO Address for the console UART.
* @note CONSOLE_UART must be defined in board.h.
*/
#define UART_FIFO MXC_UART_GET_FIFO(CONSOLE_UART)
/* Compiler Specific Includes */
/* GCC */
#if defined ( __GNUC__ )
#include <unistd.h>
#include <sys/stat.h>#endif /* __GNUC__ */
/* Keil MDK Compiler */
#if defined ( __CC_ARM )
#include <time.h>
#include <rt_misc.h>
#pragma import(__use_no_semihosting_swi)
struct __FILE { int handle; };
FILE __stdout;
FILE __stdin;
/**
* Integer to store the last character read from the FILE using fgetc().
* Only valid if fgetc() was the last function called on the stream.
*/
int g_lastChar = 0;
/**
* Global variable set to TRUE if fgetc() was previously called, false otherwise.
* This variable is necessary for implementing __backspace(FILE *f) in the MDK microlib.
*/
int g_readChar = 0;
#endif /* __CC_ARM */
/* Defines - Compiler Specific */
#if defined ( __ICCARM__ )
#define STDIN_FILENO 0 /**> Definition of stdin */
#define STDOUT_FILENO 1 /**> Definition of stdout */
#define STDERR_FILENO 2 /**> Definition of stderr */
#define EBADF -1 /**> Error code for EBADf */
#endif /* __ICCARM__ */
/* The following libc stub functions are required for a proper link with printf().
* These can be tailored for a complete stdio implementation.
* GNUC requires all functions below. IAR & KEIL only use read and write.
*/
#if defined ( __GNUC__ )
int _open(const char *name, int flags, int mode)
{
return -1;
}
int _close(int file)
{
return -1;
}
int _isatty(int file)
{
return -1;
}
int _lseek(int file, off_t offset, int whence)
{
return -1;
}
int _fstat(int file, struct stat *st)
{
return -1;
}
#endif /* __GNUC__ */
/* Handle IAR and ARM/Keil Compilers for _read/_write. Keil uses fputc and
fgetc for stdio */
#if defined (__ICCARM__) || defined ( __GNUC__ )
#if defined ( __GNUC__ ) // GNUC _read function prototype
int _read(int file, char *ptr, int len)
{
unsigned int n;
#elif defined ( __ICCARM__ ) // IAR Compiler _read function prototype
int __read(int file, unsigned char *ptr, size_t len){
size_t n;
#endif /* */
int num = 0; // count of number received.
switch (file)
{
case STDIN_FILENO:
for (n = 0; n < len; n++) {
*ptr = UART_ReadByte(MXC_UARTn); // read a byte.
UART_WriteByte(MXC_UARTn,*ptr); // echo the byte.
if (*ptr == '\r') { // check for end of line.
*ptr = '\n';
num++;
ptr++;
break;
} else {
ptr++;
num++;
}
}
break;
default:
errno = EBADF;
return -1;
}
return num;
}
/* newlib/libc printf() will eventually call write() to get the data to the stdout */
#if defined ( __GNUC__ )
// GNUC _write function prototype
int _write(int file, char *ptr, int len)
{
int n;
#elif defined ( __ICCARM__ ) // IAR Compiler _read function prototype
// IAR EW _write function prototype
int __write(int file, const unsigned char *ptr, size_t len)
{
size_t n;
#endif /* __GNUC__ */
switch (file) {
case STDOUT_FILENO:
case STDERR_FILENO:
for (n = 0; n < len; n++) {
if (*ptr == '\n') {
UART_WriteByte(MXC_UARTn,'\r');
}
UART_WriteByte(MXC_UARTn,*ptr++);
}
break;
default:
errno = EBADF;
return -1;
}
return len;
}
#endif /* ( __ICCARM__ ) || ( __GNUC__ ) */
/* Handle Keil/ARM Compiler which uses fputc and fgetc for stdio */
#if defined ( __CC_ARM )
int fputc(int c, FILE *f)
{ if(c != '\n') {
UART_WriteByte(MXC_UARTn,c);
} else {
UART_WriteByte(MXC_UARTn,'\r');
UART_WriteByte(MXC_UARTn,'\n');
}
return 0;
}
int __backspace(FILE *f)
{
if (g_readChar)
return g_lastChar;
else
return EOF;
}
int fgetc(FILE *f)
{
g_lastChar = (int)UART_ReadByte(MXC_UARTn); /* Read the byte and save it to global for backspace */
g_readChar = 1; /* set global to indicate g_lastChar is valid. */
return g_lastChar;
}
int ferror(FILE *f)
{
g_readChar = 0;
return EOF;
}
void _ttywrch(int c)
{
if(c != '\n') {
UART_WriteByte(MXC_UARTn,c);
} else {
UART_WriteByte(MXC_UARTn,'\r');
UART_WriteByte(MXC_UARTn,'\n');
}
}
void _sys_exit(int return_code)
{
while(1); /* endless loop for embedded micro */
}
#endif /* __CC_ARM */