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; } }
The variable unite is use only at line :
D:0008H SYMBOL UNITE?040
but I note that there is a ?040. Why ?
It's so easy in assembleur why is it so difficult in C ? However, the C language is a high level language.
The problem, I think, is that the variable "unite" is not stock at the good place, and I think that there is, somewhere in Keil, a place to define this, because in assembleur we define this emplacement, for example (MOV 33h, #01Fh), bot not in C, and I don't know how Keil define this automatically.
When we create a software on a PC, windows define automatically the place where variables are stock in the RAM, but maybe with microcontroleur it works diferently.
Are you OK with me ?