zlg7290.c

zlg7290的linux下的驱动

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>                                /* 文件操作 */
#include <sys/ioctl.h>				  /* ioctl()函数 */
#include "i2c.h"                                  /* I2C 命令 */

#define	 I2C_ADDR 	0x70                          /* zlg7290从机地址 */
int fd;


int zlg7290_getkey(unsigned short *key);
int zlg7290_sndcmd(unsigned char dat1, unsigned char dat2);
void zlg7290_disp(unsigned char *buf, unsigned char num);



int main()
{
    int ret,i;
    unsigned char buf[9];
    unsigned short key;
   
	fd = open("/dev/i2c/0", O_RDWR);              /* 打开设备 */
    if(fd == -1)
    {
        printf("Can't open I2C device!\n");
        exit(-1);
    } 

    ret = ioctl(fd, I2C_TENBIT, 0);               /* 指定从机地址为7bit */
    if (ret != 0)
    {
    	printf("Can't set I2C address bit number.\n");
    	close(fd);
    	exit(-1);
    }
 
    ret = ioctl(fd, I2C_SLAVE, I2C_ADDR >> 1);    /* 设置从机地址,7位地址,须右移1位*/
    if (ret != 0)
    {
    	printf("Can't set I2C slave device address.\n");
    	close(fd);
    	exit(-1);
    }

	/* 设置I2C总线频率小于30KHz */
	ret = ioctl(fd, I2C_S3C2410_SET_SPEED, 3);	  /* 3为I2C总线频率分频值 */  
	if (ret != 0)
	{
		printf("Can't set I2C speed.\n");	
		close(fd);
		exit(-1);
	}
	
	/* 读取I2C总线频率 */	
    ret = ioctl(fd, I2C_S3C2410_GET_SPEED, &i);
  	if (ret != 0)
  	{
		printf("Can't read I2C speed.\n");
		close(fd);	
		exit(-1);  		
  	}
   	printf("I2C Speed is:%dKHz\n", i);

    // S3C2410A //
    buf[7] = 0x05;
    buf[6] = 0x03;
    buf[5] = 0x0C;
    buf[4] = 0x02;
    buf[3] = 0x04;
    buf[2] = 0x01;
    buf[1] = 0x00;
    buf[0] = 0x0A;

	/* 显示 S3C2410A */
    zlg7290_disp(buf, 8);						
 	    
    for (;;)
    {
        if (zlg7290_getkey(&key) != 0)					/* 读取按键键值 */
        {
        	printf("Read key value fail\n");
        	exit(-1);	
        }
        
        if (zlg7290_sndcmd(0x70, 1<<(key - 1)) != 0)	/* 闪烁 */
        {
        	printf("Display fail\n");
        	exit(-1);
        }
        
        usleep(1000);
     }

    close(fd); 
    return 0;
}


/*********************************************************************************************************
** Function name: zlg7290_getkey
** Descriptions:  get the key value from zlg7290
**                从zlg7290取得按键键值	
** Input: 		  unsigned short *key:  the gotten key value
** Output: 		  0 : OK   -1: fail 
** Created by:    Ming Yuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
int zlg7290_getkey(unsigned short *key)
{
    unsigned char temp[2];

    temp[0] = 1;
    temp[1] = 0;
    if (write(fd, temp, 1) != 1)				/* 发送子地址 */
    	return -1;
    	
	if (read(fd, temp, 2) != 2)					/* 读取键值 */
		return -1;
	
	*key = temp[0] + (temp[1] * 256);
	
	return 0;
}


/*********************************************************************************************************
** Function name: zlg7290_sndcmd
** Descriptions:  send command to zlg7290
**                向zlg7290发送命令
** Input: 		  unsigned char dat1: command word 1
				  unsigned char dat2: command word 2
** Output: 		  0 : OK   -1: fail 
** Created by:    Ming Yuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
int zlg7290_sndcmd(unsigned char dat1, unsigned char dat2)
{
    unsigned char temp[3];

    temp[0] = 0x07;
    temp[1] = dat1;
    temp[2] = dat2;
   
    if (write(fd, temp, 3) != 3)
    	return -1;
    	
    usleep(1000);
    return 0;
}

/*********************************************************************************************************
** Function name: zlg7290_disp
** Descriptions:  control zlg7290 to driver led
**                控制zlg7290驱动led
** Input: 		  unsigned char *buf: display buffer
				  unsigned char num: display number
** Output: 		  NULL
** Created by:    Ming Yuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void zlg7290_disp(unsigned char *buf, unsigned char num)
{
    unsigned char i;
    unsigned char temp[3];

    for(i=0; i<num; i++)
    {
        temp[0] = 0x07;
        temp[1] = 0x60+i;
        temp[2] = *buf;
        buf++;
        write(fd, temp, 3);
        usleep(5000);
    }
}


/**************************************************************************
**                            End Of File
**************************************************************************/