#include #include #include using namespace std; typedef void (*fnptr)(void); #define IRQ *(fnptr*)(0x00000018)//The IRQ address in the exception vector addresses. #define INTMSK (*(volatile unsigned *)0X4A000008)//INTERRUPT MASK (INTMSK) REGISTER #define SRCPND (*(volatile unsigned *)0X4A000000) #define INTPND (*(volatile unsigned *)0X4A000010) #define GPGCON (*(volatile unsigned *)0x56000060)//buttons' interrupts portG #define GPGDAT (*(volatile unsigned *)0x56000064) #define GPGUP (*(volatile unsigned *)0x56000068) void _irs() ; /* 1 GPG0 - EINT8 2 GPG3 nSS1 EINT11 3 GPG5 SPIMISO1 EINT13 4 GPG6 SPIMOSI1 EINT14 5 GPG7 SPICLK1 EINT15 6 GPG11 TCLK1 EINT19*/ int main() { INTMSK =~(1<<5);//[5] 0 = Service available IRQ=_irs;//setting the IRQ handler GPG =(2|2<<6|2<<10|2<<12|2<<14|2<<22);//buttons' interrupts enabling configuration GPGUP =0; while (1);//catching the interrupts return 0; } void _irs(void){ clrscr(); int button=GPGDAT &(1|1<<3|1<<5|1<<6|1<<7|1<<11); switch (button){ 1 :printf("\n The 1st button is turned on") ; break ; 1<<3:printf("\n The 2nd button is turned on") ; break ; 1<<5:printf("\n The 3d button is turned on") ; break ; 1<<6:printf("\n The 4th button is turned on") ; break ; 1<<7:printf("\n The 5th button is turned on") ; break ; 1<<11:printf("\n The 6th button is turned on") ; break ; default :printf("\nPlease ,use only one button at the same time"); }; SRCPND =~(1<<5);//clearing to receive another valid request from the same source INTPND =~(1<<5); _asm SUBS PC,R14_irq,#4 _endasm }

IRS