xirq0.c

最新版IAR FOR ARM（EWARM）5.11中的代码例子

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

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

 Date          : October 2006

 File          : XIRQ0.c

 Hardware      : Applicable to ADuC7020/ADuC7024/ADuC7026
                 Currently targetting the ADuC7024

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


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

#include <Analogdevices/ioaduc7024.h>             //    Include ADuC7024 Header File
#include <intrinsics.h>


__irq __arm void IRQ_Handler(void);       // IRQ Function Prototype


void delay(int);


// IMPORTANT - The amount of stack spaces allocated for the IRQ stack is
//             defined by __ICFEDIT_size_irqstack__ in the linker script file. 
//             If you add additional function calls or additional local 
//             variables then you should verify that __ICFEDIT_size_irqstack__ 
//             is still sufficiently large to prevent overflow of the stack and 
//             corruption of data
//             All default exception handlers (except reset) are defined as weak 
//             symbol definitions.
//             If a handler is defined by the application it will take precedence.
__irq __arm void IRQ_Handler(void)                      //      IRQ Handler
{
   GP4DAT ^= 0x04040000;            //      Complement P4.2
   while(GP0DAT & 0x00010){}        //      wait for XIRQ to be low again
   return ;
}

// IMPORTANT - The amount of stack spaces allocated for the FIQ stack is
//             defined by __ICFEDIT_size_fiqstack__ in the linker script file. 
//             If you add additional function calls or additional local 
//             variables then you should verify that __ICFEDIT_size_fiqstack__ 
//             is still sufficiently large to prevent overflow of the stack and 
//             corruption of data
//             All default exception handlers (except reset) are defined as weak 
//             symbol definitions.
//             If a handler is defined by the application it will take precedence.
__fiq __arm void FIQ_Handler(void)                 //      fiq Handler
{
   // Replace this while (1) code with a proper handler for the fiq source
   while (1);  
}

int main (void)
{

   IRQEN = XIRQ0_BIT;            // Enable XIRQ0 in IRQEnable

   GP0CON = 0x00;
   GP4DAT = 0x04000000;          // Configure P4.2 as output
   GP3DAT = 0xff000000;          // Configure port 3 as output

#ifdef USE_REMAP   // Have RAM at 0x0 instead of flash?
    REMAP = 0x1;
#endif

   __enable_interrupt();                           //      Enable interrupts
   while(1)
   {
      GP3DAT ^= 0x00ff0000;            //    Complement Port 3
      delay(900000);          // Delay to make blink visible
   }
}



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