hi there, i have struct with the problem.in the multiplexing of the 7-segment display. as i complited the 7-segment display multiplexing. prog.is working properly. but when i moved to the next some advance step it give's the above msg. i think the problem is in the variable passing between function. because as i try to pass the local data to globle side
can any one explain me the passing the value's between two function. the function returning the value is in the main function and the function which recive's the value is out of the main function the function which recive's the value is out of the main function is the part of the interrupt routine the function which sending or returning the value is the part of main function
her is the full code with warnning
#include<reg52.h> #include<define.h> #include<intrins.h> /*function declaration*/ void blink(void); void disp_wait(void); void disp_inc_wait(void); void sft_wait(void); void disp(unsigned int a); void blink(void); unsigned int go (void); /*************************/ unsigned char number_code[10] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; unsigned int i,j,k,l,a; unsigned int sft;// = 1; /* interrupt setting (routine)*/ void TMR_0(void) interrupt 1 { TF0 = 0; TR0 = 0; TH0 = 0xAA; disp(a); TL0 = 0x00; TR0 = 1; } void disp(unsigned int a) { sft = a; DECOD1 = 0;/**** 7-segment 1st display *******/ DECOD2 = 0; DECOD3 = 0; P0 = number_code[i]; if(sft != 1) {disp_wait();} blink(); DECOD1 = 1;/*** 7-segment 2nd display *******/ DECOD2 = 0; DECOD3 = 0; P0 = number_code[j]; if(sft != 2) {disp_wait();} blink(); DECOD1 = 0;/* 7-segment 3rd display ****/ DECOD2 = 1; DECOD3 = 0; P0 = number_code[k]; if(sft != 3) {disp_wait();} blink(); DECOD1 = 1;/** 7-segment 4th display *****/ DECOD2 = 1; DECOD3 = 0; P0 = number_code[l]; if(sft != 4) {disp_wait();} blink(); } /***dly routine's*************/ void disp_wait() { unsigned int w1 = 0; unsigned int w2 = 0; for(w1 = 1;w1<=2;w1++) { for(w2 = 1;w2<=200;w2++) {} } } void disp_inc_wait() { unsigned int w1 = 0; unsigned int w2 = 0; for(w2 = 1;w2 <=60;w2++) { for(w1 = 1;w1 <=800;w1++) { _nop_(); } } } void sft_wait() { unsigned int w1 = 0; unsigned int w2 = 0; for(w2 = 1;w2 <=100;w2++) { for(w1 = 1;w1 <=800;w1++) {_nop_();} } } /****blink char(dly)******/ void blink() { unsigned int w1 = 0; unsigned int w2 = 0; for(w2 = 1; w2<=20; w2++) { sft_wait(); } } /****** main prog******/ void main() { P0 = 0x3f; /* initial port setting */ P1 = 0xff; P2 = 0xf8; P3 = 0xff; IE = 0x82;/*timer and interrept setting */ TMOD = 0x01; TH0 = 0xAA; TL0 = 0x00; TR0 = 1; while(1) { unsigned int go();WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS } } unsigned int go() { /*shift key press identification ****/ if(KEY2_SFT == 0) { sft++; sft_wait(); KEY2_SFT = 1; if(sft > 4) {sft = 1;} } /* opration on shift char ***/ switch(sft) { case 1: /****** 7-segment 1st *******/ if(KEY1_INC == 0) { i++; if(i > 9) {i = 0;} disp_inc_wait(); KEY1_INC = 1; } break; case 2: if(KEY1_INC == 0) /* 7-segment 2nd */ { j++; if(j > 9) {j = 0;} disp_inc_wait(); KEY1_INC = 1; } break; case 3: if(KEY1_INC == 0)/* 7-segment 3rd ***/ { k++; if(k > 9) {k = 0;} disp_inc_wait(); KEY1_INC = 1; } break; case 4: if(KEY1_INC == 0)/* 7-segment 4th */ { l++; if(l > 9) {l = 0;} disp_inc_wait(); KEY1_INC = 1; } break; } a = sft; return(a); }
Why do you think it's associated with that particular line?
This is a Linker warning - that's why it begins with an 'L' It is not related to a specific 'C' source line!
The full text of the message looks like this: http://www.keil.com/support/man/docs/lx51/lx51_l16.htm
Or this: http://www.keil.com/support/man/docs/bl51/bl51_l16.htm
You have omitted to post the important bit - which is the segment-name
The segment-name tells you what it is that the Linker thinks is uncalled...
i m very very thank full to you for guiding me. as problem is solved fully(no error by changing the type defn and warnning by giving or alloting the returned value to other variable and from that varible the value is collected at the other end ) this help's me alot but not able to give the output as i required i have to think in other way again thank's for u r help
"i have to think in other way again "
I think you need to take a step back and review the basics of programming in 'C'