led_api.c

来自「arm汇编语言程序和一些实验代码」· C语言 代码 · 共 88 行

#include <stdio.h>

#include "led_api.h"

/* delay for about one second */
void delay(void)	
{
	int i, j;

	for( i=0; i<100; i++ )
		for ( j=0; j<65536; j++ )
			;
}

int led_init(void)
{
	led_open();
	return 0;
}

int led_on(int index)
{
	int i = 0;
	char led_status[4];

	for(i = 0; i < LED_NUM; i++)
		led_status[i] = (char)-1;

	led_status[index] = 1;
	led_write( led_status, 4 );	

	return 0;
}

int led_off(int index)
{
	int i = 0;
	char led_status[4];

	for(i = 0; i < LED_NUM; i++)
		led_status[i] = (char)-1;

	led_status[index] = 0;
	led_write( led_status, 4 );	

	return 0;
}

int led_running_horse(void)
{
	int i = 0;
	int index = 0;
	
	led_init();

	while(1)
	{
		led_off(0);
		led_off(1);
		led_off(2);
		led_off(3);

		index = i++ % 4;
		led_on(index);
		delay ();
	}
}

int led_two_blink(void)
{
	led_init();

	while(1)
	{
		led_on(0);
		led_on(1);
		led_off(2);
		led_off(3);
		delay();

		led_off(0);
		led_off(1);
		led_on(2);
		led_on(3);
		delay();
	}
}