官方给的例子报错是咋回事呢？STC89-90xx Series MCU IO Demo
//
//由于P0口为开漏模式,所以需要外接10K左右的上拉电阻才可以正常测试
//对于STC90C5xAD/STC9LEC5xAD系列,P4口的地址为 0C0H
//
//P4.5默认为ALE引脚,需要使用ISP下载软件将它编程为P4.5口才可正常测试
//
#include "reg51.h"
sbit P00 = P0^0;
sbit P01 = P0^1;
sbit P02 = P0^2;
sbit P03 = P0^3;
sbit P04 = P0^4;
sbit P05 = P0^5;
sbit P06 = P0^6;
sbit P07 = P0^7;
sbit P10 = P1^0;
sbit P11 = P1^1;
sbit P12 = P1^2;
sbit P13 = P1^3;
sbit P14 = P1^4;
sbit P15 = P1^5;
sbit P16 = P1^6;
sbit P17 = P1^7;
sbit P20 = P2^0;
sbit P21 = P2^1;
sbit P22 = P2^2;
sbit P23 = P2^3;
sbit P24 = P2^4;
sbit P25 = P2^5;
sbit P26 = P2^6;
sbit P27 = P2^7;
sbit P30 = P3^0;
sbit P31 = P3^1;
sbit P32 = P3^2;
sbit P33 = P3^3;
sbit P34 = P3^4;
sbit P35 = P3^5;
sbit P36 = P3^6;
sbit P37 = P3^7;
sfr P4 = 0xC0;
sbit P40 = P4^0;
sbit P41 = P4^1;
sbit P42 = P4^2;
sbit P43 = P4^3;
//sfr P4 = 0xc0; //STC90C5xAD/STC9LEC5xAD系列
void delay()
{
int i, j;
for (i=0; i<1000; i++)
for (j=0; j<500; j++);
}
void main()
{
P10 = 0;
delay();
P10 = 1;
P11 = 0;
delay();
P11 = 1;
P12 = 0;
delay();
P12 = 1;
P13 = 0;
delay();
P13 = 1;
P14 = 0;
delay();
P14 = 1;
P15 = 0;
delay();
P15 = 1;
P16 = 0;
delay();
P16 = 1;
P17 = 0;
delay();
P17 = 1;
P30 = 0;
delay();
P30 = 1;
P31 = 0;
delay();
P31 = 1;
P32 = 0;
delay();
P32 = 1;
P33 = 0;
delay();
P33 = 1;
P34 = 0;
delay();
P34 = 1;
P35 = 0;
delay();
P35 = 1;
P36 = 0;
delay();
P36 = 1;
P37 = 0;
delay();
P37 = 1;
P20 = 0;
delay();
P20 = 1;
P21 = 0;
delay();
P21 = 1;
P22 = 0;
delay();
P22 = 1;
P23 = 0;
delay();
P23 = 1;
P24 = 0;
delay();
P24 = 1;
P25 = 0;
delay();
P25 = 1;
P26 = 0;
delay();
P26 = 1;
P27 = 0;
delay();
P27 = 1;
P00 = 0;
delay();
P00 = 1;
P01 = 0;
delay();
P01 = 1;
P02 = 0;
delay();
P02 = 1;
P03 = 0;
delay();
P03 = 1;
P04 = 0;
delay();
P04 = 1;
P05 = 0;
delay();
P05 = 1;
P06 = 0;
delay();
P06 = 1;
P07 = 0;
delay();
P07 = 1;
P40 = 0;
delay();
P40 = 1;
P41 = 0;
delay();
P41 = 1;
P42 = 0;
delay();
P42 = 1;
P43 = 0;
delay();
P43 = 1;
while (1)
{
P1 = 0x00;
delay();
P1 = 0xff;
P3 = 0x00;
delay();
P3 = 0xff;
P2 = 0x00;
delay();
P2 = 0xff;
P0 = 0x00;
delay();
P0 = 0xff;
P4 = 0x00;
delay();
P4 = 0xff;
}
}
--------------------------------------------------------------------------
linking...
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL:?C_START
MODULE:STARTUP.obj (?C_STARTUP)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL:?C_START
MODULE:STARTUP.obj (?C_STARTUP)
ADDRESS: 0155H
Program Size: data=9.0 xdata=0 code=343
---------------------------------------------
为什么官方给的例子会报警告呢？
项目里面是不是有“STARTUP.A51”文件？有的话删掉试试。 乘风飞扬 发表于 2024-4-27 11:58
项目里面是不是有“STARTUP.A51”文件？有的话删掉试试。
删掉了，也清除缓存了。重新编译还是报
linking...
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL:?C_STARTUP
MODULE:rda.obj (RDA)
Program Size: data=8.0 xdata=0 code=328
之前总共两个警告，删除后L2警告没有了，但是L1还是有，是不是和什么选项有关呢？ durongze 发表于 2024-4-27 12:13
删掉了，也清除缓存了。重新编译还是报
linking...
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
能否将你的项目打包发出来？ 这个是我的工程，帮我看下，谢谢 乘风飞扬 发表于 2024-4-27 12:17
能否将你的项目打包发出来？
compiling my_test.c...
assembling my_test.src...
linking...
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL:?C_STARTUP
MODULE:my_test.obj (MY_TEST)
Program Size: data=8.0 xdata=0 code=328
creating hex file from "my_test"...
"my_test" - 0 Error(s), 1 Warning(s). C51 COMPILER V9.01 MY_TEST 04/27/2024 12:27:20 PAGE 1
C51 COMPILER V9.01, COMPILATION OF MODULE MY_TEST
NO OBJECT MODULE REQUESTED
COMPILER INVOKED BY: F:\program\KeilC51\C51\BIN\C51.EXE my_test.c BROWSE DEBUG OBJECTEXTEND SRC(.\my_test.SRC)
line level source
1 /*------------------------------------------------------------------*/
2 /* --- STC MCU Limited ---------------------------------------------*/
3 /* --- STC89-90xx Series MCU IO Demo -------------------------------*/
4 /* --- Mobile: (86)13922805190 -------------------------------------*/
5 /* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
6 /* --- Tel: 86-0513-55012928,55012929,55012966----------------------*/
7 /* --- Web: www.STCMCU.com -----------------------------------------*/
8 /* --- Web: www.GXWMCU.com -----------------------------------------*/
9 /* If you want to use the program or the program referenced in the*/
10 /* article, please specify in which data and procedures from STC */
11 /*------------------------------------------------------------------*/
12
13 //
14 //由于P0口为开漏模式,所以需要外接10K左右的上拉电阻才可以正常测试
15 //对于STC90C5xAD/STC9LEC5xAD系列,P4口的地址为 0C0H
16 //
17 //P4.5默认为ALE引脚,需要使用ISP下载软件将它编程为P4.5口才可正常测试
18 //
19
20 #include "reg51.h"
21
22 sbit P00 = P0^0;
23 sbit P01 = P0^1;
24 sbit P02 = P0^2;
25 sbit P03 = P0^3;
26 sbit P04 = P0^4;
27 sbit P05 = P0^5;
28 sbit P06 = P0^6;
29 sbit P07 = P0^7;
30 sbit P10 = P1^0;
31 sbit P11 = P1^1;
32 sbit P12 = P1^2;
33 sbit P13 = P1^3;
34 sbit P14 = P1^4;
35 sbit P15 = P1^5;
36 sbit P16 = P1^6;
37 sbit P17 = P1^7;
38 sbit P20 = P2^0;
39 sbit P21 = P2^1;
40 sbit P22 = P2^2;
41 sbit P23 = P2^3;
42 sbit P24 = P2^4;
43 sbit P25 = P2^5;
44 sbit P26 = P2^6;
45 sbit P27 = P2^7;
46 sbit P30 = P3^0;
47 sbit P31 = P3^1;
48 sbit P32 = P3^2;
49 sbit P33 = P3^3;
50 sbit P34 = P3^4;
51 sbit P35 = P3^5;
52 sbit P36 = P3^6;
53 sbit P37 = P3^7;
54
55 sfr P4 = 0xC0;
C51 COMPILER V9.01 MY_TEST 04/27/2024 12:27:20 PAGE 2
56 sbit P40 = P4^0;
57 sbit P41 = P4^1;
58 sbit P42 = P4^2;
59 sbit P43 = P4^3;
60
61
62 //sfr P4 = 0xc0; //STC90C5xAD/STC9LEC5xAD系列
63
64 void delay()
65 {
66 1 int i, j;
67 1
68 1 for (i=0; i<1000; i++)
69 1 for (j=0; j<500; j++);
70 1 }
71
72
73 void main()
74 {
75 1 P10 = 0;
76 1 delay();
77 1 P10 = 1;
78 1 P11 = 0;
79 1 delay();
80 1 P11 = 1;
81 1 P12 = 0;
82 1 delay();
83 1 P12 = 1;
84 1 P13 = 0;
85 1 delay();
86 1 P13 = 1;
87 1 P14 = 0;
88 1 delay();
89 1 P14 = 1;
90 1 P15 = 0;
91 1 delay();
92 1 P15 = 1;
93 1 P16 = 0;
94 1 delay();
95 1 P16 = 1;
96 1 P17 = 0;
97 1 delay();
98 1 P17 = 1;
99 1
100 1 P30 = 0;
101 1 delay();
102 1 P30 = 1;
103 1 P31 = 0;
104 1 delay();
105 1 P31 = 1;
106 1 P32 = 0;
107 1 delay();
108 1 P32 = 1;
109 1 P33 = 0;
110 1 delay();
111 1 P33 = 1;
112 1 P34 = 0;
113 1 delay();
114 1 P34 = 1;
115 1 P35 = 0;
116 1 delay();
117 1 P35 = 1;
C51 COMPILER V9.01 MY_TEST 04/27/2024 12:27:20 PAGE 3
118 1 P36 = 0;
119 1 delay();
120 1 P36 = 1;
121 1 P37 = 0;
122 1 delay();
123 1 P37 = 1;
124 1
125 1 P20 = 0;
126 1 delay();
127 1 P20 = 1;
128 1 P21 = 0;
129 1 delay();
130 1 P21 = 1;
131 1 P22 = 0;
132 1 delay();
133 1 P22 = 1;
134 1 P23 = 0;
135 1 delay();
136 1 P23 = 1;
137 1 P24 = 0;
138 1 delay();
139 1 P24 = 1;
140 1 P25 = 0;
141 1 delay();
142 1 P25 = 1;
143 1 P26 = 0;
144 1 delay();
145 1 P26 = 1;
146 1 P27 = 0;
147 1 delay();
148 1 P27 = 1;
149 1
150 1 P00 = 0;
151 1 delay();
152 1 P00 = 1;
153 1 P01 = 0;
154 1 delay();
155 1 P01 = 1;
156 1 P02 = 0;
157 1 delay();
158 1 P02 = 1;
159 1 P03 = 0;
160 1 delay();
161 1 P03 = 1;
162 1 P04 = 0;
163 1 delay();
164 1 P04 = 1;
165 1 P05 = 0;
166 1 delay();
167 1 P05 = 1;
168 1 P06 = 0;
169 1 delay();
170 1 P06 = 1;
171 1 P07 = 0;
172 1 delay();
173 1 P07 = 1;
174 1
175 1 P40 = 0;
176 1 delay();
177 1 P40 = 1;
178 1 P41 = 0;
179 1 delay();
C51 COMPILER V9.01 MY_TEST 04/27/2024 12:27:20 PAGE 4
180 1 P41 = 1;
181 1 P42 = 0;
182 1 delay();
183 1 P42 = 1;
184 1 P43 = 0;
185 1 delay();
186 1 P43 = 1;
187 1
188 1 while (1)
189 1 {
190 2 P1 = 0x00;
191 2 delay();
192 2 P1 = 0xff;
193 2
194 2 P3 = 0x00;
195 2 delay();
196 2 P3 = 0xff;
197 2
198 2 P2 = 0x00;
199 2 delay();
200 2 P2 = 0xff;
201 2
202 2 P0 = 0x00;
203 2 delay();
204 2 P0 = 0xff;
205 2
206 2 P4 = 0x00;
207 2 delay();
208 2 P4 = 0xff;
209 2 }
210 1 }
211
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 328 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE.0 WARNING(S),0 ERROR(S)
-------------------------------------------------------
好奇怪啊，软件界面有警告提示，链接日志里好像又没有。。。。 警告没事程序能正常运行就没问题 my_test.c文件右键选择“Options for file...”
点击选择框，让这两个选项变灰就可以：
soma 发表于 2024-4-27 12:37
警告没事程序能正常运行就没问题
{:titter:} 最可怕的是潜在问题啊， {:funk:}
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