test-key.c

来自「uClinux 环境下按键的驱动程序及相应的用户开发的简单实例。还有Makefi」· C语言 代码 · 共 62 行

/*********************************************************************
* File：		test-key.c
* Author：	
* Desc：		
* History：	
*********************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <linux/i2c.h>
#include <linux/fcntl.h>
#include "zlg7290.h"


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


int main(int argc, char** argv)
{
	int cx, cy, fd;
	char key;

	/* open device */
	fd = open("/dev/i2c0", O_RDWR);
	/* set zlg7290 slave address */
	ioctl(fd, I2C_SLAVE_FORCE, ZLG_SLAVE_ADDR);
	/* set i2c bus clock 16KHz */
	ioctl(fd, I2C_SET_BUS_CLOCK, 16*1000);

	printf("press 4:5 to exit keyboard test...\n");
	for(;;)
	{
		/* zlg7290 inner register access address */
		ioctl(fd, I2C_SET_DATA_ADDR, REG_Sys);
		read(fd, &key, 1);

		/* check key pressed */
		if(key & 0x01)
		{
			/* zlg7290 inner register access address */
			ioctl(fd, I2C_SET_DATA_ADDR, REG_Key);
			/* read key value */
			read(fd, &key, 1);
			if(key > 0)
			{
				/* adjust base zero */
				cx = ((key-1) % 8) + 1; cy = ((key-1) / 8) + 1;
				printf("row %d : col %d : Value = %d\n", cy, cx, key);
				if(cy == 4 && cx == 5)
					break;
			}
		}
	}
	close(fd);

	return 0;
}