main.c

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//*----------------------------------------------------------------------------
//*         ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//  DISCLAIMER:  THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
//  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
//  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
//  DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
//  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
//  OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
//  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
//  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
//  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//*----------------------------------------------------------------------------
//* File Name           : main.c
//* Object              : main application written in C
//* Creation            : JPP   16/Sep/2005
//*----------------------------------------------------------------------------

// Include Standard files
#include "project.h"


/* Global variables */
#define      SPEED 		( AT91B_MAIN_OSC /1000)
unsigned int LedSpeed = SPEED *20 ;
const int led_mask[AT91B_NB_LEB]= {AT91B_LED1, AT91B_LED2, AT91B_LED3, AT91B_LED4};

//*--------------------------------------------------------------------------------------
//* Function Name       : change_speed
//* Object              : Adjust "LedSpeed" value depending on SW1 and SW2 are pressed or not
//* Input Parameters    : none
//* Output Parameters   : Update of LedSpeed value.
//*--------------------------------------------------------------------------------------
void change_speed ( void )
{//* Begin
    if ( (AT91F_PIO_GetInput(AT91D_BASE_PIO_SW) & AT91B_SW1) == 0 )
    {
        if ( LedSpeed > SPEED ) LedSpeed -=SPEED ;
    }
    if ( (AT91F_PIO_GetInput(AT91D_BASE_PIO_SW) & AT91B_SW3) == 0 )
    {
        if ( LedSpeed < AT91B_MAIN_OSC ) LedSpeed +=SPEED ;
    }
}//* End

//*--------------------------------------------------------------------------------------
//* Function Name       : wait
//* Object              : Software waiting loop
//* Input Parameters    : none. Waiting time is defined by the global variable LedSpeed.
//* Output Parameters   : none
//*--------------------------------------------------------------------------------------
void wait ( void )
{//* Begin
    unsigned int waiting_time ;
    change_speed () ;
    for(waiting_time = 0; waiting_time < LedSpeed; waiting_time++) ;
}//* End

//*--------------------------------------------------------------------------------------
//* Function Name       : Main
//* Object              : Software entry point
//* Input Parameters    : none.
//* Output Parameters   : none.
//*--------------------------------------------------------------------------------------
int main()
{//* Begin
    int i;
    // First, enable the clock of the PIO
       AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1 << AT91C_ID_PIOA ) ;

    // then, we configure the PIO Lines corresponding to LED1 to LED4
    // to be outputs. No need to set these pins to be driven by the PIO because it is GPIO pins only.
       AT91F_PIO_CfgOutput( AT91D_BASE_PIO_LED, AT91B_LED_MASK ) ;

    // Clear the LED's. On the EB55 we must apply a "1" to turn off LEDs
       AT91F_PIO_SetOutput( AT91D_BASE_PIO_LED, AT91B_LED_MASK ) ;
    // Clear the LED's. On the EB55 we must apply a "1" to turn off LEDs
       AT91F_PIO_ClearOutput( AT91D_BASE_PIO_LED, AT91B_LED_MASK ) ;

    // Loop forever
    for (;;)
    {
        // Once a Shot on each led
	for ( i=0 ; i < AT91B_NB_LEB ; i++ )
        {
	    AT91F_PIO_ClearOutput( AT91D_BASE_PIO_LED, led_mask[i]) ;
	    wait();
	    AT91F_PIO_SetOutput( AT91D_BASE_PIO_LED, led_mask[i] ) ;
	    wait();
        }// End for
        // Once a Shot on each led
        for ( i=(AT91B_NB_LEB-1) ; i >= 0 ; i-- )
        {
	    AT91F_PIO_ClearOutput( AT91D_BASE_PIO_LED, led_mask[i]) ;
	    wait();
	    AT91F_PIO_SetOutput( AT91D_BASE_PIO_LED, led_mask[i] ) ;
	    wait();
        }
    }// End for
}//* End