xirq0.c

ADuC7020/26是ADI模拟公司开发的ARM7TDMI内核

/*********************************************************************

 Author        : ADI - Apps            www.analog.com/MicroConverter

 Date          : Sept. 2005

 File          : XIRQ0.c

 Hardware      : Applicable to ADuC702x rev H or I silicon
                 Currently targetting ADuC7026.

 Description   : Complement port 3 in a loop.
				 When XIRQ0 is pressed, complement P4.2	
		
*********************************************************************/

#include <ADuC7026.h>					// 	Include ADuC7026 Header File

void IRQ_Handler(void) __irq;			//	IRQ Funtion Prototype 
void delay(int);
										// 	Memory function macro 
int main (void)  {

	IRQEN = XIRQ0_BIT;					//	Enable XIRQ0 in IRQEnable 


	GP4DAT = 0x04000000;				//	Configure P4.2 as output
	GP3DAT = 0xff000000;				//	Configure port 3 as output

	while(1)
	{
		GP3DAT ^= 0x00ff0000;	   		// 	Complement Port 3
		delay(10000);					//	Delay to make blink visible
	}
                   
	return 0 ;
}

/********************************************************************/
/*                                                                  */
/*		Interrupt Service Rountine									*/
/*                                                                  */
/********************************************************************/

void IRQ_Handler() __irq
{
	GP4DAT ^= 0x00040000;				// Complement P4.2
	while(GP0DAT & 0x00010){}			// wait for XIRQ to be low again
	return ;
}

void delay (int length)
{
	while (length >=0)
    	length--;
}