Hello All,

I am quite new to C programming for microcontrollers.
As I can make out, there is a big difference in writing a program in Turbo C and writing a program for 8051 or any other microcontroller, as the Memory is the main constrain.

I have a small doubt about static local variable & global variable.

I ahve made a surch on 8052 for "Static local Variables"
and found many results but somehow they confused me more :-(

the links are
http://www.8052.com/forum/read.phtml?id=34575
http://www.8052.com/forum/read.phtml?id=33249
http://www.8052.com/forum/read.phtml?id=33225
http://www.8052.com/forum/read.phtml?id=9800
http://www.8052.com/forum/read.phtml?id=8228


I have a function in which I check for a certain error condition and if that error is there for 7 consicutive cycles then only I acknowledge it as an error for my system.
Here for counting the consicutive occurences of the error I am using a counter variable (fail_count)
and I am incrementing it whenever I get an error cycle.

In my system of controlling a fuel flow I have to control many things
(
The system consists of --
Control Board --
AT89C52 Based main controller Board

Display Boards --
16+16 - 1" LCD digits driven by using 7211 Display Driver

Keyboard --
20Key Keyboard

Keypad Display --
20 Charactor LCD with Backlight

Optical Pulser --
3 Optical sensors

Relay Board --
2 Solenoid relays and 1 main motor relay
)

As much as I can makeout both static local as well as global will solve my problem of having a counter for counting number of error-cycles only
But please tell me what will be benifitail -
If I make the variable fail_count
as static local variable or
as global variable.

I am using a KEIL PK51 tool & I would like to know the possibilities of the global variable's value getting altered, which is not expected.

I think, I am confused totally, please help.

Sachin