retarget.c

altera epxa1的例子程序

/*
* 	This provides implementations of _sys_exit(), _ttywrch() and ___stackheap(), which are
*	the bare minimum required to enable use of the ARM C libraries. Only some of the
*	functionality of the libraries is available, for example any call to printf will cause
*	a linker error as the libraries do not know how to output the characters.
*
*	Please see Chapter 4 of the ARM Developer Suite Tools guide for more information
*
*	Author:	Paul
*	=========================================================
*
* 	This is based opon the embed/rom example supplied with the ARM Developer Suite, so
*	it's partly
*
* 	Copyright (C) ARM Limited, 1999. All rights reserved.
*
*	and partly
*
* 	Copyright (c) Altera Corporation 2000.
* 	All rights reserved.
*
*/

#include <stdio.h>
#include <rt_misc.h>
#include "serial.h"

//struct __FILE { int handle;   /* Add whatever you need here */};
//FILE __stdout;

void _sys_exit(int return_code)
{

label:  goto label; /* endless loop */
}

void _ttywrch(int ch)
{
	/*
	*	This function is supposed to output a character to the console
	*	given that we don't have one, we can't really do very much
	*/
    char tempch = ch;
    sendchar( &tempch );
}

int fputc(int ch, FILE *f)
{
    /* Place your implementation of fputc here */
    /* e.g. write a character to a UART, or to the debugger console with SWI WriteC */

    char tempch = ch;
    sendchar( &tempch );
    return ch;
}

int fgetc(FILE *f)
{
    /* Place your implementation of fgetc here */
    /* e.g. read a character from a UART */

    char ch;
    ch = receivechar();
    // echo ???
    sendchar((char *)&ch);

    return (int)ch;
}



__value_in_regs struct __initial_stackheap __user_initial_stackheap(
        unsigned R0, unsigned SP, unsigned R2, unsigned SL)
{
	
	 
    extern unsigned int Image$$COND_BIN_ARRAY$$Limit;

    struct __initial_stackheap config;

    /* Start the Heap at the end of the zero initialised data */
    config.heap_base = (unsigned int)&Image$$COND_BIN_ARRAY$$Limit;
    config.stack_base = SP;

    return config;
}