本人真实小白，网上找到的两相四线步进电机程序，想用的单片机型号STC 89R52C,用keil4编译后出现警告如下。
SYMBOL: ?C_START MODULE: STARTUP.obj (?C_STARTUP) *** WARNING L2: REFERENCE MADE TOUNRESOLVED EXTERNAL SYMBOL: ?C_START MODULE: STARTUP.obj (?C_STARTUP) ADDRESS: 000DH Program Size: data=9.0 xdata=0 code=15 creating hex file from "步进1"... "步进1" - 0Error(s), 2 Warning(s).
源程序如下： #include"reg52.h" #include"INTRINS.H" #include<absacc.h> #include<math.h> #define uint unsigned int #define uchar unsigned char
void check_addr(void); /*地址核对*/
uchar code slave_addr[4]={00,01,02,255}; /*从机地址*/ uchar idata T0low, T0high,common_count,input_order,cmd_in_permit,interval; uchar sent_ok,speed_change,start_up,start_end,address_true,i;
uint y1;
uint code add[100]={60006,62771,63693,64154,64430,64614,64746,64845, 64922,64983,65033,65075,65111,65141,65167,65190,65211,65229,65245,65260, 65273,65285,65296,65306,65315,65323,65331,65339,65345,65352,65358,65363, 65368,65373,65378,65382,65387,65390,65394,65398,65401,65404,65407,65410, 65413,65416,65418,65421,65423,65425,65428,65430,65432,65434,65435,65437, 65439,65441,65442,65444,65445,65447,65448,65450,65451,65452,65453,65455, 65456,65457,65458,65459,65460,65461,65462,65463,65464,65465,65466,65467, 65468,65469,65469,65470,65471,65472,65472,65473,65474,65475,65475,65476, 65477,65477,65478,65478,65479,65480,65480,65481};
sbit P2_0=P2^0; /*作输入步进电机的脉冲信号发送口*/ sbit P2_2=P2^2; /*作输入步进电机的旋转方向信号发送口*/ sbit P1_0=P1^0; /*作串口输出信号的使能口,P1_0=0时接通串口,输出信号*/ sbit WD=P1^7; /*看门狗*/
main() { P2_0=0; P2_2=0; /*步进电机的旋转方向待试验后确定*/ P1_0=1; /*开机时需要关断,串口发送功能,需要时再接通*/ WD=1; /*看门狗先为1，电平翻转为喂狗*/ i=0; common_count=0; cmd_in_permit=0; input_order=0; interval=0; address_true=1; speed_change=0; start_up=0; start_end=0; sent_ok=0; //允许发送 EA=1; /*开放总中断*/ TMOD=0x21; TH1 = 0xFD; //波特率9600 TL1 = 0xFD; SCON = 0xd0; //设定串行口工作方式 PCON &= 0x00; //波特率不倍增 SM2=1; TR1=1; ES=1; //启动定时器1
T2MOD=00; T2CON=0x00; RCAP2H=0xEE; //赋T2的预置值0xA600,25MS，0xB800，20MS,0xCA00， //15MS,0xDC00,10MS,0xEE00,5MS RCAP2L=0x00; TR2=1; //启动定时器 ET2=1; //打开定时器2中断 do { if(address_true==1) { address_true=0; check_addr(); } if(start_up==1&&start_end==0) //第一次启动 { y1=add[common_count]; T0high=(uchar)(y1>>8); /*取y1的高8位*/ T0low=(uchar)(y1&0x00ff); /*取y1的低8位*/ TR0=1; ET0=1; /*允许T/C0中断*/ start_end=1; } if(speed_change==1) { if(interval>=0&&interval<=0x63) { if(interval>common_count) {common_count=common_count+1; } if(interval<common_count) {common_count=common_count-1; } } speed_change=0; } if(sent_ok==1) { sent_ok=0; P1_0=0; for(i=0;i<=20;i++){_nop_();}
TI=0;SBUF=T0high; while(TI==0);TI=0; TI=0; SBUF=T0low; while(TI==0);TI=0;
P1_0=1; for(i=0;i<=20;i++) {_nop_();}
SM2=1; } } while(1); }
void timer0(void)interrupt 1 using 3 { P2_0=~P2_0; y1=add[common_count]; T0high =(uchar)(y1>>8); /*取y1的高8位*/ T0low = (uchar)(y1&0x00ff); /*取y1的低8位*/ TH0=T0high; /*高8位T0high送定时器0的TH0*/ TL0=T0low; /*低8位T0low送定时器0的TL0*/ } void timer2(void)interrupt 5 using 2 { TF2=0; /*T2溢出中断需软件清0*/ speed_change=1; //速度可以改变标示，以便主程序处理 WD=!WD; /*MAX813喂狗*/ }
void inte_SERIAL() interrupt 4 using 1 /*串口0中断服务子程序*/ { uchar key_in; key_in=0; if(RI) }
特请大侠指教，错误在哪里；如何修改？
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