i am facing a wierd problem.. My MCU P89V51RD2BN resets during Execution... i am a college student and a beginner Here so i dont know the Advanced Programming methods i would also inform that..
i have a recursive function , a warning is issued by the compiler for the same. but....
earlier this was not a problem but since i have modified some of the Sub-Routines for 16Bit Data this Problem has come up, i need those functions to be 16 bit because of the limitation of the ALU i was earlier using 8bit and leaving most of the Task to Assumption which i cannot do so now..
i would also state that the Problem occurs in a fumction at a point when i call 2 functions in the same code, these themselves call around 5 sub-routines each but that wasnt a problem earlier (before i used the 16bit return type sub-routines).
now i found something in the manual stating reentrant Functions, but i really dont know how to use it
i used it like this
void Home_Screen_Instance() reentrant { ------------ } Do i need to use the keyword "reentrant" in the Function Decleration too? but that didnt help either but the compilers shows an error Home_Screen_Instance : redefinition. Target Not Created
this was the first of a kind problem that i encountered, my MCU is resetting itself for sure(i checked that with a dummy subroutine of blinking LED) and it is not because of the watchdog timer, i am sure about that too..
so whats the Problem here?
is the Stack overflowing??? or there is any other reason behind this? should i revert back to the 8bit versions of my subroutine (without any other choice)? is it because of the recursive nature of the function H0me_screen_instance?
Related Data:
The Program is Display intensive, i mean there are a lot of Strings to be displayed and they are stored beforehand in XDATA, message shown during sucessfull compilation, (still resets) Program Size: data 9.4 xdata 252 code 9514 creating hex-----blah blah blah---- 0 Error(s) 65 Warning(s)
I do know what you used the parameters for.
But the interesting question is why you think you need the parameter "BreakC".
yeah... i didnt realize that was actually taking extra work all the time, i really didnt require BreakC... ill define a constant for that, it would atleast reduce the number of parameters
here i got another problem, the code in between the Stars is being bypassed completely, i didnt understand it first but then i started inserting dummy routines in between codes and found out that the code (in Bold) is being completely bypassed every time.
Home_Screen() //Draws the Home Screen Keypad_Instance() //Has been already posted in this thread Check_Lock1() //Checks if the code entered is correct or not and opens the lock if true
void Start() { Lock_State = Closed; do { Home_Screen(); while(Keypad_Input() == False);// Wait for a key to be pressed. //******************************************************************************************* while(Lock_State == Closed) { Lock_Screen(); Keypad_Instance(5,2,8,0,'C'); // 5 character password at pos 2,8, Hidden and 'C' is the break Character Check_Lock1(); //Check the Password, if true then Lock_State=Open if(Lock_State == Open)// Lock is Open break; else { LCD_Cursor_XY(3,7); LCD_Text("RETRY !!!"); //on entering Wrong Password } } Main_Menu1_Instance(); //********************************************************************************************* }while(1); }
i didnt get it, why is this not working, Note: i tried implemnting the Code in italics in a do-While loop, but the same problem creeped up, this was not a problem when i had those recursive functions LOL ;P!!