led_swing.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           : led_swing.c
//* Object              : Led Swing for the AT91EB40A
//*
//* 1.0 06/08/01  PF    : Creation
//*----------------------------------------------------------------------------
#ifndef AT91_DEBUG_NONE
#include <stdio.h>
#endif

#include "parts/r40008/lib_r40008.h"
#include "drivers/capture/capture.h"
#include "drivers/wait/wait.h"
#include "targets/eb40a/eb40a.h"

extern void wake_up_handler (void) ;

/* Global Variable */
WaitDesc wait_desc = { &TC0_DESC, 0, 0, WAIT_DELAY, wake_up_handler } ;

u_int LedSpeed = 50000 ;
u_int loop_count = 0 ;

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

//*----------------------------------------------------------------------------
//* Function Name       : change_speed
//* Object              : Adjust led speed depending on SW1 and SW3
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : none
//*----------------------------------------------------------------------------
void change_speed ( void )
//* Begin
{
    u_int status = at91_pio_read (&PIO_DESC) ;
    if (( status & SW1 ) == 0 )
    {
        if ( LedSpeed > 10000 ) LedSpeed -=1000 ;
    }
    if (( status & SW3 ) == 0 )
    {
        if ( LedSpeed < 2000000 ) LedSpeed +=1000 ;
    }
}
//* End


//*----------------------------------------------------------------------------
//* Function Name       : main
//* Object              : Main function of the led blink
//* Input Parameters    : none
//* Output Parameters   : True
//* Functions called    :
//*----------------------------------------------------------------------------
int main( void )
//* Begin
{
    int   i = 0 ;

    //* -- Set up PIO
    at91_pio_open ( &PIO_DESC, LED_MASK, PIO_OUTPUT ) ;
	at91_pio_write (&PIO_DESC, LED_MASK, LED_OFF ) ;
	


    //* Detect Master Clock
    wait_desc.mcki_khz = 66000 ;

    //* Loop forever
    for (;;)
    {
        //* Once a Shot on each led
		for ( i=0 ; i < 8 ; i++ )
        {
            change_speed () ;
            at91_pio_write (&PIO_DESC, led_mask[i], LED_ON ) ;
            wait_desc.period = LedSpeed ;
            at91_wait_open ( &wait_desc ) ;
            at91_pio_write (&PIO_DESC, led_mask[i], LED_OFF ) ;
        }

        //* Once a Shot on each led
        for ( i=7 ; i >= 0 ; i-- )
        {
            change_speed () ;
            at91_pio_write (&PIO_DESC, led_mask[i], LED_ON ) ;
            at91_wait_open ( &wait_desc ) ;
            at91_pio_write (&PIO_DESC, led_mask[i], LED_OFF ) ;
        }
    
#ifdef SEMIHOSTING
       printf ( "Loop %d\n", loop_count ) ;
#endif
        loop_count ++ ;
    }

    return(TRUE);
//* End
}