今天下午我那个小板子搭接完毕，烧录了一片2051，上电后电机仅仅是前后颤动。。。。没有直接启动运行。
正在查找原因。。。。。。做过这个实验的朋友也指点一下好吗？
程序如下：
/*
* stepper.c
* sweeping stepper's rotor cw and cww 400 steps
* copyright (c) 1999 by w.sirichote
*/
#include c:\mc51\8051io.h /* include i/o header file */
#include c:\mc51\8051reg.h
register unsigned char j,flag1,temp;
register unsigned int cw_n,ccw_n;
unsigned char step[8]={0x80,0xc0,0x40,0x60,0x20,0x30,0x10,0x90}
#define n 400
/* flag1 mask byte
0x01 run cw()
0x02 run ccw()
*/
main()
{
flag1=0;
serinit(9600);
disable(); /* no need timer interrupt */
cw_n = n; /* initial step number for cw */
flag1 |=0x01; /* initial enable cw() */
while(1){
{
tick_wait(); /* wait for 10ms elapsed */
energize(); /* round-robin execution the following tasks every 10ms */
cw();
ccw();
}
}
}
cw(){
if((flag1&0x01)!=0)
{
cw_n--; /* decrement cw step number */
if (cw_n !=0)
j++; /* if not zero increment index j */
else
{flag1&=~0x01; /* disable cw() execution */
ccw_n = n; /* reload step number to ccw counter */
flag1 |=0x02; /* enable cww() execution */
}
}
}
ccw(){
if((flag1&0x02)!=0)
{
ccw_n--; /* decremnet ccw step number */
if (ccw_n !=0)
j--; /* if not zero decrement index j */
else
{flag1&=~0x02; /* disable ccw() executon */
cw_n = n; /* reload step number to cw counter */
flag1 |=0x01; /* enable cw() execution */
}
}
}
tick_wait(){ /* cputick was replaced by simpler asm code 10ms wait */
asm" jnb tcon.5,*"; /* wait for tf0 set */
asm" clr tcon.5"; /* clear tf0 for further set */
asm" orl th0,#$dc"; /* reload th0 with $dc, tl0 = 0 */
}
energize(){
p1 = step[(j&0x07)]; /* only step 0-7 needed */
}
