本人真實小白，網上找到的兩相四線步進電機程序，想用的單片機型號STC 89R52C,用keil4編譯后出現警告如下。
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 "步進1"... "步進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); /*地址核對*/
uchar code slave_addr[4]={00,01,02,255}; /*從機地址*/ 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; /*作輸入步進電機的脈沖信號發送口*/ sbit P2_2=P2^2; /*作輸入步進電機的旋轉方向信號發送口*/ sbit P1_0=P1^0; /*作串口輸出信號的使能口,P1_0=0時接通串口,輸出信號*/ sbit WD=P1^7; /*看門狗*/
main() { P2_0=0; P2_2=0; /*步進電機的旋轉方向待試驗后確定*/ P1_0=1; /*開機時需要關斷,串口發送功能,需要時再接通*/ WD=1; /*看門狗先為1，電平翻轉為喂狗*/ 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; //允許發送 EA=1; /*開放總中斷*/ TMOD=0x21; TH1 = 0xFD; //波特率9600 TL1 = 0xFD; SCON = 0xd0; //設定串行口工作方式 PCON &= 0x00; //波特率不倍增 SM2=1; TR1=1; ES=1; //啟動定時器1
T2MOD=00; T2CON=0x00; RCAP2H=0xEE; //賦T2的預置值0xA600,25MS，0xB800，20MS,0xCA00， //15MS,0xDC00,10MS,0xEE00,5MS RCAP2L=0x00; TR2=1; //啟動定時器 ET2=1; //打開定時器2中斷 do { if(address_true==1) { address_true=0; check_addr(); } if(start_up==1&&start_end==0) //第一次啟動 { 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; /*允許T/C0中斷*/ 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送定時器0的TH0*/ TL0=T0low; /*低8位T0low送定時器0的TL0*/ } void timer2(void)interrupt 5 using 2 { TF2=0; /*T2溢出中斷需軟件清0*/ speed_change=1; //速度可以改變標示，以便主程序處理 WD=!WD; /*MAX813喂狗*/ }
void inte_SERIAL() interrupt 4 using 1 /*串口0中斷服務子程序*/ { uchar key_in; key_in=0; if(RI) }
特請大俠指教，錯誤在哪里；如何修改？
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