Hello everybody.
I'm french, so sorry for my english.
First, thanks for all gentlemens who will help me.
I follow a formation about programmation microcontroleur 8051's family.
First I have studied the microcontroleur himself, after I have made a lot of programs in assembleur with Keil, and no problem.
After I have learn the langage C, and I have made a lot of program on my computer for the computer, and now I try to made the same previous program that I have created in assembleur but in langage C, always with Keil, and I have a problem.
The problem is that the hyperterminal diplay :
"Serial number : 1’˜ž¤ª"
instead of display "Serial number : 111111".
The problem is when the program call the fonction VERIFTI(), the veriable unite is lost!!!! Why ?????
Do you have an idea?
My microcontroleur is an NXP P89V51RD2BN
Please look at my program:
#include <REG51.H> void VERIFRI()reentrant; void VERIFTI()reentrant; data unsigned char cent; data unsigned char diz; data unsigned char unite; void Led_chenillard() { SM0=0; //UART en mode 1 SM1=1; //UART en mode 1 SM2=0; //Gestion multiprocesseur inactive REN=1; //Reception active TMOD=0x20; //Config Timer 1 en mode 2 et mode temporisateur TH1=255; //56000 Bauds TR1=1; //Active le timer 1 TI=1; SBUF=0x0C; //Efface écran VERIFTI(); //Vérifie si l'envoie au PC est terminé SBUF='S'; VERIFTI(); SBUF='e'; VERIFTI(); SBUF='r'; VERIFTI(); SBUF='i'; VERIFTI(); SBUF='a'; VERIFTI(); SBUF='lk'; VERIFTI(); SBUF=' '; VERIFTI(); SBUF='n'; VERIFTI(); SBUF='u'; VERIFTI(); SBUF='m'; VERIFTI(); SBUF='b'; VERIFTI(); SBUF='e'; VERIFTI(); SBUF='r'; VERIFTI(); SBUF=' '; VERIFTI(); SBUF=':'; VERIFTI(); SBUF=' '; VERIFTI(); unite='1'; SBUF=unite; VERIFTI(); SBUF=unite; VERIFTI(); SBUF=unite; VERIFTI(); SBUF=unite; VERIFTI(); SBUF=unite; VERIFTI(); SBUF=unite; VERIFTI(); FIN: goto FIN; } void VERIFRI()reentrant { DEBUT: if (RI==0) { goto DEBUT; } else { RI=0; } } void VERIFTI()reentrant { DEBUT: if (TI==0) { goto DEBUT; } else { TI=0; } }
Please don't fight the programming language by writing C code as if you were still writing in assembler. Forget about the "goto" keyword until you are already able to write C programs fluently. And even then consider pretending that the language doesn't have any "goto" keyword.
void VERIFRI()reentrant { DEBUT: if (RI==0) { goto DEBUT; } else { RI=0; } }
void VERIFRI() reentrant { while (RI == 0) ; RI = 0; }
Another thing - why do you want VERIFRI() to be reentrant? That's a very costly keyword intended for special needs.
And finally - limit the use of all-capitals symbol names for #define'd symbols, to follow the accepted C language naming conventions.
Ok thanks, I will try your answer.
The frequency of the quartz is 11.0592MHz
My answer isn't a solution to your problem. It's just a solution to trying to the C programming language to write "assembler" code.
High-level languages did get loop and conditional constructs just so that people would not need to use jumps.