S3C2440 external interrupt response register setting method

If the following settings are not followed, the interrupt will not be executed or the next interrupt will not be entered.

/*Interrupt suspension setting, this process is added to the main function and loaded at startup*/

void Eint_wait()

{

   rSRCPND=rSRCPND; //Interrupt pending register clear

   rINTPND=rINTPND; //Interrupt source pending register clear

   rEINTPEND|=0x1<<13; //External interrupt pending register, Eint pending interrupt

   rSRCPND=BIT_EINT8_23; //Interrupt source pending register corresponding position 1 waiting for interrupt

   rINTPND=BIT_EINT8_23; //Interrupt pending register corresponding position 1 waiting for interrupt

}

/*End of interrupt suspend setup*/

/*The following is the processing procedure when responding to an interrupt, which is the function in the pISR pointer*/

void __irq Eint_Isr(void)

{

   if(rEINTPEND == (1<<13)) //When judging whether Eint13 has a response, execute as follows

   {

     rGPBDAT=0x0<<6; //led6 is on

     delay(10000); //Description: Since the edge triggering method is used, the edge process will be completed after the button is pressed. After completion, the else processing will be immediately entered and the light will be turned off. The naked eye may not be able to see it. In order to see the effect, the LED needs to be on for a while!

     rEINTPEND=(1<<13); //Set the interrupt suspend register Eint13 to 1 and wait for the next interrupt to arrive. If the next interrupt is not set, the program cannot enter.

   }

   else //When it is not Eint13, execute as follows

   {

     rGPBDAT=0x1<<6;

     rEINTPEND=(1<<13); //Set the interrupt suspend register Eint13 to 1 and wait for the next interrupt to arrive. If the next interrupt is not set, the program cannot enter.

   }

}

The above two parts are important contents of simplified interrupt processing, which can be used by modifying rGPBDAT and rEINTPEND according to the output pin. Other settings are not explained here.