about the steps of program ASM in C with Keil C.

HI

I have writen the next file,but it's wrong!
In the source group 1,there are three flies:test.c,
START900.A51 and C51S.LIB.
why.....?


//file name:test.c
#ifdef ASM unsigned long shiftR1(register unsigned long);
#else extern unsigned long shiftR1(register unsigned long);
#endif
#define ASM
#include<asm.h>
#include <Reg936.h>
void delay02s(acd) { #pragma ASM abcd: mov r6,#40 abcc: mov r5,#255 djnz r5,$ djnz r6,abcc djnz r7,abcd #pragma ENDASM }

void main( void)
{ unsigned char ab,acd; P0M1=0xff; P0M2=0xff; ab=1; acd=128; while(1) { if(ab==128) { P0=~acd; ab=128; acd/=2; delay02s(acd); } if(acd==128) { P0=~ab; acd=128; ab*=2; delay02s(ab/2); } if((ab==128)&&(acd==1)) { ab=1; acd=128; } }
}
How can I program ASM in C,or include other .asm programme or files?