test-8led.c

父子进程实现

/*********************************************************************
* File：		test-8led.c
* Author：	
* Desc：		
* History：	
*				Original version, 2005.4 Embest
*********************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <linux/i2c.h>
#include <linux/fcntl.h>
#include "test-8led.h"

/* control code */
#define I2C_SET_DATA_ADDR	0x0601
#define I2C_SET_BUS_CLOCK	0x0602

/*------------------------------------------------------------------------------------------*/
/*	 								global variables										*/
/*------------------------------------------------------------------------------------------*/
unsigned char digit[] ={0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xF6};	// 0 ~ 9		

int main(int argc, char** argv)
{
	int i, j, fd, idx;
	char ch;
	static char *driver = "/dev/i2c/0";

	printf(" 8-segment LEDs Test Example Base on Linux.\n");
	printf(" Please Look at 8-segment LED...\n");
	/* open device */
	fd = open(driver, O_RDWR);
	if(fd < 0)
	{
		printf("device open fail\n");
		return -1;
	}
	/* set zlg7290 slave address */
	ioctl(fd, I2C_SLAVE_FORCE, ZLG_SLAVE_ADDR);
	/* set i2c bus clock 250KHz */
	ioctl(fd, I2C_SET_BUS_CLOCK, 250*1000);

	/* display all segment */
	ch = 0xff;
	for(j=0; j<8; j++)
	{
		/* zlg7290 inner register access address */
		ioctl(fd, I2C_SET_DATA_ADDR, REG_Dis7-j);
		write(fd, &ch, 1);
	}
	sleep(2);

	/* display digit */
	for(i=0; i<10; i++)
	{
		for(j=0; j<8; j++)
		{
			idx = (i + j + 1) % sizeof(digit);
			/* zlg7290 inner register access address */
			ioctl(fd, I2C_SET_DATA_ADDR, REG_Dis7-j);
			write(fd, &digit[idx], 1);
		}
		sleep(1);
	}
	sleep(2);

	/* turn off all segment */
	ch = 0x00;
	for(j=0; j<8; j++)
	{
		/* zlg7290 inner register access address */
		ioctl(fd, I2C_SET_DATA_ADDR, REG_Dis7-j);
		write(fd, &ch, 1);
	}
	printf(" end.\n");
	close(fd);

	return 0;
}