Keil c51 common error warning prompt information-EEWORLD

Collect

1. Warning 280:'i':unreferenced local variable

This indicates that no access operation is performed on the local variable i in the function.

Solution: Eliminate the declaration of the i variable in the function.

2. Warning 206:'Music3':missing function-prototype

This means that the Music3() function has not been declared or has not been declared externally, so it cannot be called by other functions.

The solution is to write the statement void Music3(void) at the beginning of the program as a declaration. If it is a function of other files, it should be written as extern void Music3(void), that is, as an external declaration.

3. Compling: C:\8051\MANN.C

Error:318:can't open file 'beep.h'

Description: During the compilation of the C:\8051\MANN.C program, main.c used the instruction #include "beep.h", but it could not find it.

Solution Write an include file called beep.h and save it in the working directory of c:\8051.

4. Compiling: C:\8051\LED.C

Error 237:'LedOn':function already has a body

Description: The LedOn() function name is defined repeatedly, that is, there are two or more identical function names.

Solution: Fix one of the function names so that the function names are independent.

5. ***WARNING 16:UNCALLED SEGMENT,IGNORED FOR OVERLAY PROCESS

SEGMENT: ?PR?_DELAYX1MS?DELAY

This shows that the DelayX1ms() function will occupy program memory space even if it is not called by other functions.

The solution is to remove the DelayX1ms() function or use conditional compilation #if …#endif to keep the function and not compile.

6. ***WARNING 6 :XDATA SPACE MEMORY OVERLAP

FROM : 0025H

TO: 0025H

Explanation: The 0025H address of the external data ROM is repeatedly defined.

Solution: The definition of external data ROM is as follows

Pdata unsigned char XFR_ADC _at_0x25 The name of the XFR_ADC variable is 0x25. Please check if it is

Is there any other variable name defined at 0x25? Correct it.

7． WARNING 206:'DelayX1ms': missing function-prototype

C:\8051\INPUT.C

Error 267:'DelayX1ms ':requires ANSI-style prototype C:\8051\INPUT.C

This means that the DelayX1ms function is called in the program but the function is not defined, that is, the program content or function is not written.

Defined but not declared.

Solution: After writing the content of DelayX1ms, you must also declare it or make an external declaration in delay.h

The included file is declared as external for other functions to call.

8. ***WARNING 1:UNRESOLVED EXTERNAL SYMBOL

SYMBOL:MUSIC3

MODULE:C:\8051\MUSIC.OBJ(MUSIC)

***WARNING 2:REFERENCE MADE TO UNRESOLVED EXTERNAL

SYMBOL:MUSIC3

MODULE:C:\8051\MUSIC.OBJ(MUSIC)

ADDRESS:0018H

This means that the MUSIC function is called in the program but the extension C of the function is not added to the project file.

Prj compiles and links.

Solution: Set the MUSIC3 function in MUSIC C and add MUSIC C to the project file.

9 . ***ERROR 107:ADDESS SPACE OVERFLOW

SPACE: DATA

SEGMENT: _DATA_GOUP_

LENGTH: 0018H

***ERROR 118: REFERENCE MADE TO ERRONEOUS EXTERNAL

SYMBOL: VOLUME

MODULE: C:\8051\OSDM.OBJ (OSDM)

ADDRESS: 4036H

The address range of the data storage space is 0~0x7f.

If the storage mode is set to SMALL, local variables will be temporarily stored in working registers R2~R7.

If the number of temporary data in the data type space exceeds 0x7f, the address will be insufficient.

Solution: Change the public variable defined as data type to idata type.

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