main.c

ATMEL AT91RM9200开发板配套光盘上的全部示例程序

//*----------------------------------------------------------------------------
//*         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           : main.c
//* Object              : main application written in C
//* Creation            : JPP   16/Nov/2002
//*
//*----------------------------------------------------------------------------

// Include Standard files 
#include "include/AT91M42800A.h"
#include "include/lib_AT91M42800A.h"
#include "eb42.h"

/* Global variables */
#define SPEED 		(MCKKHz/100)
unsigned int LedSpeed = SPEED *100 ;


const int led_mask[8]= {LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8};

//*--------------------------------------------------------------------------------------
//* 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(AT91C_BASE_PIOB) & SW1_MASK) == 0 )
    {
        if ( LedSpeed > SPEED ) LedSpeed -=SPEED ;
    }
    if ( (AT91F_PIO_GetInput(AT91C_BASE_PIOB) & SW3_MASK) == 0 )
    {
        if ( LedSpeed < MCK ) 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()
{
    int i;
    // First, enable the clock of the PIOB
    AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<<AT91C_ID_PIOB ) ;

    // then, we configure the PIOB Lines corresponding to LED1 to LED8
    // to be outputs. No need to set these pins to be driven by the PIOB because it is GPIOB pins only.
    AT91F_PIO_CfgOutput( AT91C_BASE_PIOB, LED_MASK ) ;

    // Clear the LED's. On the EB55 we must apply a "1" to turn off LEDs
    AT91F_PIO_SetOutput( AT91C_BASE_PIOB, LED_MASK ) ;

    //* Loop forever
    for (;;)
    {
        //* Once a Shot on each led
		for ( i=0 ; i < 8 ; i++ )
        {
	    AT91F_PIO_ClearOutput( AT91C_BASE_PIOB, led_mask[i]) ;
	    wait();
	    AT91F_PIO_SetOutput( AT91C_BASE_PIOB, led_mask[i] ) ;
	    wait();
        }

        //* Once a Shot on each led
        for ( i=7 ; i >= 0 ; i-- )
        {
	    AT91F_PIO_ClearOutput( AT91C_BASE_PIOB, led_mask[i]) ;
	    wait();
	    AT91F_PIO_SetOutput( AT91C_BASE_PIOB, led_mask[i] ) ;
	    wait();
        }
    }
	
}