Study the following software example which shows data sharing between an ISR and the background main task.

1) Is this software prone to data corruption due to a shared data bug?

2) If yes, explain the problem using an example.

3) How would you resolve this?

static int iMinutes, iSeconds; //global variables

Void main (void) {

int TotalSeconds;

iSeconds = 0;

iMinutes = 0;

while(TRUE)

{

TotalSeconds = (iMinutes * 60) + iSeconds;

!! Print TotalSeconds onto serial port.

} }

void interrupt vTimeUpdate(void) //Timer ISR which runs every one second {

!! ISR book keeping, clearing flag, scheduling next interrupt, etc.

iSeconds++;

if (iSeconds>59)

{ iSeconds = 0;

iMinutes++;

}

}

static int iMinutes, iSeconds; Iglobal variables Void main (void) int TotalSeconds; iSeconds 0 iMinutes-0 while(TRUE) TotalSeconds (iMinutes 60)+iSeconds !! Print TotalSeconds onto serial port. void interrupt vTimeUpdate(void) /Timer ISR which runs every one second !! ISR book keeping, clearing flag, scheduling next interrupt, etc iSeconds++; if (iSeconds>59) [iSeconds 0: iMinutes++