Event Router, Arm, Register nicht beschreibbar

void atkeyb_init(void)

{

  inpt = kb_buffer;// Initialize buffer

  outpt = kb_buffer;

        DWORD regVal;

        static DWORD test, mu,du,er;

  atkeyb_buffcnt = 0;

  GPIO2_DR&=~(1<<KEYB_DATA_PIN);     //input

        GPIO2_DR &=~(1<<KEYB_CLOCK_PIN);   //Input

  //KEYB_DATA_PORT&=~(1<<KEYB_DATA_PIN);

        //TO-DO: Setting up event....

        ER_APR &= ~(1<<3);  // active LOW -> falling edge 

        ER_ATR |=(1<<3); // event is latched-

        SFSP2_7 = (1<<1)|(1<<2)|(1<<3); //Function 2: EXT3 ;Used Pull up

        SFSP2_6 = (1<<2)|(1<<3);        //use intern pullup

        ER_INT_CLR = 0x3FFFFFF;  // Clear all Interrupt-Flags

        ER_MASK_CLR = 0x3FFFFFF; //Clear all masks

        install_irq( EVT_INT, (void *)EXT_INT_3_Handler, 0x0A );

        EnableIntReq_IRQ( EVT_INT, ACTIVE_LOW, 0x0A );

        ER_MASK_SET |= (1<<3);  //activate EXT_Int 3 

        regVal = ER_PEND;

        mu=ER_APR;

        du=ER_MASK_SET;

        er=ER_MASK_CLR;

        flag.ascii=1;

        return;

}