1. You are given the following code that accesses GPIO Port A. Explain the port macro definition by explaining what each part of the definition means or does, i.e., each keyword and symbol used.

#define PA (*((volatile unsigned long *)0x400043FC)); data = PA;

2. Complete the wait3() function below so that it is equivalent to wait() and wait2().

#define PA (*((volatile unsigned long *)0x400043FC)); void wait(void){ while((PA&0x20)==0){}; } void wait2(void){ while(((*((volatile unsigned long *)0x400043FC))&0x20)==0){}; }

void wait3(void){ volatile unsigned long *pt;

pt = ______________________;

while(_____________________){}; }