The interrupt service function is placed in a separate C file. How should the global variable array in the interrupt be defined?

werjufour

The interrupt service function is placed in a separate C file. How should the global variable array in the interrupt be defined? [Copy link]

 

The interrupt service function is placed in a separate C file. How should the global variable array in the interrupt be defined so that it can be used? This array is used in both the main program and the interrupt. After I define it, the compilation fails and the following error occurs: ADC1.o(.text+0xae): In function `_ADC1Interrupt': C:\Users\Administrator\Desktop\AD\ADC1.c:61: undefined reference to `ADCValue' I don't know what the reason is? The header file is as follows: #ifndef ADC1_H #define ADC1_H #define AINPUTS 0xffex //Analog inputs Set the multiplexed pin AN5 as the analog input pin. //#define AINPUTS 0xC0FF //Analog inputs Set the 6 multiplexed pins AN8~AN13 as analog input pins. /***Declare global variables****/ extern unsigned int ADCValue[6][32]; #endif The interrupt C source file is as follows: (other function settings are omitted, and the interrupt service function is given directly) #include
#include "ADC1.h" void __attribute__((interrupt,no_auto_psv)) _ADC1Interrupt(void) { int n,*BufPtr; char gNum; if(AD1CON2bits.BUFS) BufPtr=&ADC1BUF0; //The pointer points to the ADC1BUF0 unit, get the data in the lower 8-word buffer else BufPtr=&ADC1BUF8; //The pointer points to the ADC1BUF8 unit, get the data in the upper 8-word buffer for(n=0;n<6;n++) { ADCValue[n][gNum]=*BufPtr; //Transmit the collected data of 6 channels BufPtr++; } gNum++; if(gNum>=32)gNum=0; IFS0bits.AD1IF=0; //Clear interrupt flag }

lcofjp

You need to define the following array in a C file: unsigned int ADCValue[6][32]; before you can reference it in other files.

ienglgge

extern unsigned int ADCValue[6][32]; If the extern is removed and the compilation succeeds, the array is not defined.

werjufour

ienglgge posted on 2018-9-25 13:42 extern unsigned int ADCValue[6][32]; If you remove extern and the compilation passes, it means that the array is not defined.

Removing extern does not work either

werjufour

lcofjp posted on 2018-9-23 16:11 You need to define the following array in a C file: unsigned int ADCValue[6][32]; before you can reference it in other files

This array is also defined in the ADC1.C file. The main program has not used this array yet and the compilation fails

werjufour

ienglgge posted on 2018-9-25 13:42 extern unsigned int ADCValue[6][32]; If you remove extern and the compilation passes, the array is not defined.

Please help me take a good look @dcexpert

werjufour

Great Gods, please help me take a look, the program is in the attachment

dcexpert

You only defined extern unsigned int ADCValue[6][32]; this only means that this variable exists somewhere else in the system. You did not define the actual variable, so of course an error message will be prompted. You need to define an unsigned int ADCValue[6][32] in a C file.

ienglgge

werjufour posted on 2018-9-25 18:14 Removing extern doesn't work either

Removing extern doesn't work either, what's the hint? . Arrays can only be defined in one file, but can be extern in multiple files

dingzy_2002

PIC uses arrays in interrupts, but the compiler doesn't seem to support it, especially for 8-bit PIC microcontrollers.

邱海涛qht

Define unsigned int ADCvalue[6][32] in ADC.c file. Declare extern unsigned int ADCvalue[6][32] in ADC.h file.

tiankai001

Define unsigned int ADCvalue[6][32] in main.c file. Declare extern unsigned int ADCvalue[6][32] in ADC.c file.

tianle1010

The above is the orthodox way. Recommended.

lb057

The compiler does not support

tianle1010

Key points: The definition should be in the *.c file. The attached program you posted is in the *.h file. Delete "extern unsigned int ADCValue[6][32]; " in the *.h file. Change extern unsigned int ADCValue[6][32]; in the *.c file to unsigned int ADCValue[6][32] = {}; The OP needs to learn C language programming.