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/******************************************************************************
*Name: keydisled.c
*Desc: 按下一个按键，led0和串口终端显示该按键。运行该程序前，应使用insmod指令加载i2c.o驱动模块。
*Parameter:
*Return:
*Author: yoyoba([email protected])
*Date: 2010-9-19
*Modify: 2010-9-19
********************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <linux/i2c.h>
#include <linux/fcntl.h>
#include <sys/stat.h>
#include "test-8led.h"
#include <sys/types.h>
/* control code */
#define I2C_SET_DATA_ADDR 0x0601
#define I2C_SET_BUS_CLOCK 0x0602
unsigned char digit[] ={0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xF6,0xEE,0x3E,0x9C,0x7A,0x9E,0x8E};
char key_set(char ucChar)
{
switch(ucChar)
{
case 1:
case 2:
case 3:
case 4:
case 5:
ucChar-=1; break;
case 9:
case 10:
case 11:
case 12:
case 13:
ucChar-=4; break;
case 17:
case 18:
case 19:
case 20:
case 21:
ucChar-=7; break;
case 25: ucChar = 0xF; break;
case 26: ucChar = '+'; break;
case 27: ucChar = '-'; break;
case 28: ucChar = '*'; break;
case 29: ucChar = 0xFF; break;
default: ucChar = 0xFE; // error
}
return ucChar;
}
int main()
{
int fd,index=0;
char chon=0xff,choff=0x0,key=0;
printf("this is a example for 8-led,writed by youhaidong!\n");
if((fd=open("/dev/i2c/0",O_RDWR))==-1) /*打开i2c设备*/
{
printf("open led device FAILD!\n");
exit(1);
}
else
printf("open led device SUCCESS!\n");
ioctl(fd, I2C_SLAVE_FORCE, ZLG_SLAVE_ADDR); /*设置zlg7290从设备地址*/
ioctl(fd, I2C_SET_BUS_CLOCK, 250*1000); /*设置i2c总线时钟频率为250khz*/
while(1)
{
ioctl(fd,I2C_SET_DATA_ADDR,REG_Sys); //设置SystemReg寄存器的地址
read(fd,&key,1); //读取SystemReg寄存器的内容，放入key中
if(key&0x01) //SystemReg寄存器的值为1，这时才相应按键。
{
ioctl(fd, I2C_SET_DATA_ADDR, REG_Key); //设置key寄存器的地址
read(fd,&key,1); //从key寄存器读取按键的值
write(fd,&choff,1); //让led0熄灭
key=key_set(key); //把key寄存器的值转换为0-15
printf("the press key is %d\n",key);
ioctl(fd, I2C_SET_DATA_ADDR, REG_Dis0); //设置led0地址
index=(int)key; //该值为digit[]数组中的索引号
write(fd,&digit[index],1); //显示按键的值
}
}
printf("led example is over!\n");
return 0;
}
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