Question

KEIL用C语言加入PUSH，POP

单片机高手们，KEIL用C语言加入PUSH，POP，怎么做？最好给个例子

Answer 1

在keil C51中，直接调用库函数：
＃include<intrins.h> // 其中包含了对部分汇编指令的调用申明

_nop_(); // 产生一条NOP指令
_push_(acc); // 产生一条push指令

以下是intrins.h的内容
/*--------------------------------------------------------------------------
INTRINS.H

Intrinsic functions for C51.
Copyright (c) 1988-2004 Keil Elektronik GmbH and Keil Software, Inc.
All rights reserved.
--------------------------------------------------------------------------*/

#ifndef __INTRINS_H__
#define __INTRINS_H__

extern void _nop_ (void);
extern bit _testbit_ (bit);
extern unsigned char _cror_ (unsigned char, unsigned char);
extern unsigned int _iror_ (unsigned int, unsigned char);
extern unsigned long _lror_ (unsigned long, unsigned char);
extern unsigned char _crol_ (unsigned char, unsigned char);
extern unsigned int _irol_ (unsigned int, unsigned char);
extern unsigned long _lrol_ (unsigned long, unsigned char);
extern unsigned char _chkfloat_(float);
extern void _push_ (unsigned char _sfr);
extern void _pop_ (unsigned char _sfr);

#endif

Answer 2

#include<stdio.h>
int r;
extern add (int, int *);
main()
{
int i,j;
int a[6];

printf("six numbers:");
for(i=1;i<=6;i++)
{
scanf ("%d",&a[i]);
}
for(i=1;i<=6;i++)
{
add(a[i],&r);
a[i]=r;
}
for(i=1;i<=6;i++)
{
printf ("result is:%d\n",a[i]);
}

}

public _add:far
.model small
.code
_add proc
push bp
mov bp,sp
mov ax,[bp+4]
add ax,5
mov di,[bp+6]
mov [di],ax
POP bp
ret
_add endp
end