interrupt_eb42.c

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

//*----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : interrupt_eb42.c
//* Object              : Led Blinking for the AT91EB42, use interrupt
//*                       - PIO IRQ on SW4 TIOB
//*                       - IRQ0 on SW3
//*                       - FIQ on SW5
//*                       - SWIRQ
//*
//* 1.0 10/01/02 JPP    : Creation
//*----------------------------------------------------------------------------

#include    "parts/m42800/lib_m42800.h"
#include    "targets/eb42/eb42.h"
#include	"periph/timer_counter/lib_tc.h"


//*   Waiting time between LED1 and LED2
#define     WAIT_TIME       MCK

//* Global variable
int count_timer0_interrupt;
int count_timer1_interrupt;

// Use the Library Handler defined in file periph/pio/pio_irq/irq_pio.s
extern void pio_asm_irq_handler(void);
extern void irq0_asm_irq_handler(void);
extern void sw_asm_irq_handler(void);
extern void asm_fiq_init_handler(void);
extern void asm_fiq_handler(void);

extern int timer_init ( void );

//*----------------------------------------------------------------------------
//* Function Name       : aic_sotfware_interrupt
//* Object              : Sofware interup function
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : at91_pio_write
//*----------------------------------------------------------------------------
void aic_sotfware_interrupt(void)
{
    //* read the ouput state
    if ( (at91_pio_read ( &PIOB_DESC) & LED4 ) == LED4 )
    {
        at91_pio_write ( &PIOB_DESC, LED4, PIO_CLEAR_OUT );
    }
    else
    {
         at91_pio_write ( &PIOB_DESC, LED4, PIO_SET_OUT );
    }
}

//*----------------------------------------------------------------------------
//* Function Name       : pio_c_irq_handler
//* Object              : Irq Handler called by the irq_pio.s
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : at91_pio_read, at91_pio_write
//*----------------------------------------------------------------------------
void pio_c_irq_handler ( void )
{
int tmp;
    //* read the ouput state
    if ( (at91_pio_read ( &PIOB_DESC) & LED3 ) == LED3 )
    {
        at91_pio_write ( &PIOB_DESC, LED3, PIO_CLEAR_OUT );
    }
    else
    {
         at91_pio_write ( &PIOB_DESC, LED3, PIO_SET_OUT );
    }
    // enable the next PIO IRQ
    tmp = PIOB_DESC.pio_base->PIO_ISR ;
    //* while SW4 is push wait
    while ( ( at91_pio_read ( &PIOB_DESC) & SW4_MASK ) != SW4_MASK );
}

//*----------------------------------------------------------------------------
//* Function Name       : delay
//* Object              : Wait
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : none
//*----------------------------------------------------------------------------
void delay ( void )
{
    u_int    i ;
//* loop delay
    for ( i = 0 ;(i < WAIT_TIME/100 );i++ ) ;
}

//*----------------------------------------------------------------------------
//* Function Name       : main
//* Object              : Main function of the led blink
//* Input Parameters    : none
//* Output Parameters   : TRUE
//*----------------------------------------------------------------------------
int main( void )
//* Begin
{
    u_int   loop_count ;
//* Init
     loop_count = 0 ;
    //* define led at PIO output
    at91_pio_open ( &PIOB_DESC, LED_MASK, PIO_OUTPUT );

     //* Init LED state
    at91_pio_write ( &PIOB_DESC, LED_MASK, PIO_CLEAR_OUT );

    //* define switch SW4 at PIO input interupt PIO_OPENDRAIN_BIT
     at91_pio_open ( &PIOB_DESC, SW4_MASK, PIO_INPUT_IRQ_BIT );

    //* open external PIO interrupt
    at91_irq_open(PIOB_DESC.periph_id,5,AIC_SRCTYPE_INT_EDGE_TRIGGERED,pio_asm_irq_handler);

    //* open external IRQ interrupt
    at91_extirq_open(&IRQ0_DESC,4,AIC_SRCTYPE_INT_EDGE_TRIGGERED,irq0_asm_irq_handler);

    //* open external FIQ interrupt
    //init FIQ register by Software test
    at91_extirq_open(&FIQ_DESC,0,AIC_SRCTYPE_INT_EDGE_TRIGGERED,asm_fiq_init_handler);
    at91_irq_trig_cmd(FIQ_DESC.source_id,0);

    at91_extirq_open(&FIQ_DESC,0,AIC_SRCTYPE_INT_EDGE_TRIGGERED,asm_fiq_handler);

    //* Open the software interrupt on the AIC
    at91_irq_open ( SW_ID, 0, AIC_SRCTYPE_INT_EDGE_TRIGGERED, sw_asm_irq_handler ) ;

    //* Init timer interrupt
    timer_init();

    //* generate interrupt by software
    at91_irq_trig_cmd(SW_ID,0);

    at91_irq_trig_cmd(PIOB_DESC.periph_id,0);
    //* note no generate this funtion because this interrupt clear the timer interrupt
    //* at91_irq_trig_cmd(IRQ0_DESC.source_id,0);

for (;;)
    {
        at91_pio_write ( &PIOB_DESC, LED1, PIO_CLEAR_OUT );

        delay () ;

        at91_pio_write ( &PIOB_DESC, LED2, PIO_CLEAR_OUT );

        delay () ;
        at91_pio_write ( &PIOB_DESC, LED1, PIO_SET_OUT);

        delay () ;

        at91_pio_write ( &PIOB_DESC, LED2, PIO_SET_OUT );

        delay () ;

        loop_count ++ ;
        //* Set LED by software interrupt
        if (loop_count == 10)
        {
             loop_count=0;
             //* Software interrupt
             at91_irq_trig_cmd(SW_ID,0);
        }
    }
    return(TRUE);
//* End
}