【新手学习】ARM11 linux下流水灯程序的实现--欢迎高手朋友们指教 linux, 程序, 新手, 流水, 高手

七瓣雪

上周买了块OK6410的开发板，仿照他们给的LED程序写了一个流水灯的程序。感兴趣的朋友们可以多来交流，一起学习。也请坛里的高手朋友多多指教，让我更快进步O(∩_∩)O


//#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <asm/irq.h>
#include <mach/gpio.h>
#include <plat/regs-gpio.h>
#include <plat/gpio-cfg.h>
#include <mach/hardware.h>
#include <linux/io.h>

#define DEVICE_NAME "leds"
#define LED_MAJOR 231


static unsigned long led_table [] = {
       S3C64XX_GPM(0),
       S3C64XX_GPM(1),
       S3C64XX_GPM(2),
       S3C64XX_GPM(3),
};

static unsigned int led_cfg_table [] = {
S3C64XX_GPM_OUTPUT(0),
S3C64XX_GPM_OUTPUT(1),
S3C64XX_GPM_OUTPUT(2),
S3C64XX_GPM_OUTPUT(3),
};

static int s3c6410_leds_ioctl(
struct inode *inode,  
struct file *file,  
unsigned int cmd,  
unsigned long arg)
{
unsigned long tmp;
switch(cmd) {
case 0:
case 1:
if (arg > 4) {
return -EINVAL;
}
tmp = __raw_readl(S3C64XX_GPMDAT);
if(cmd)
tmp &= (~(1<<arg));
else
tmp |= (1<<arg);
__raw_writel(tmp,S3C64XX_GPMDAT);
// gpio_set_value(led_table[arg], !cmd);
return 0;
default:
return -EINVAL;
}
}


static struct file_operations s3c6410_leds_fops = {
.owner = THIS_MODULE,
.ioctl = s3c6410_leds_ioctl,
};

static struct cdev cdev_leds;
struct class * my_class;

static int __init s3c6410_leds_init(void)
{
int ret;
unsigned long tmp;
int i;
dev_t devno;
printk(KERN_NOTICE "enter s3c6410_leds_init\n");


devno = MKDEV(LED_MAJOR,0);

ret = register_chrdev_region(devno,1,DEVICE_NAME);
ret = 0;
if(ret<0)
{
printk(KERN_NOTICE "can not register led device");
return ret;
}

cdev_init(&cdev_leds,&s3c6410_leds_fops);
cdev_leds.owner = THIS_MODULE;

ret =cdev_add(&cdev_leds,devno,1);
if(ret)
{
printk(KERN_NOTICE "can not add leds device");
return ret;
}

my_class = class_create(THIS_MODULE,"my_class");
if(IS_ERR(my_class))
{
printk("Err: Failed in creating class\n");
return -1;
}

device_create(my_class,NULL,MKDEV(LED_MAJOR,0),NULL,DEVICE_NAME);

//gpm0-3 pull up
tmp = __raw_readl(S3C64XX_GPMPUD);
tmp &= (~0xFF);
tmp |= 0xaa;
__raw_writel(tmp,S3C64XX_GPMPUD);

//gpm0-3 output mode
tmp = __raw_readl(S3C64XX_GPMCON);
tmp &= (~0xFFFF);
tmp |= 0x1111;
__raw_writel(tmp,S3C64XX_GPMCON);

//gpm0-3 output 0
tmp = __raw_readl(S3C64XX_GPMDAT);
tmp |= 0x10;
__raw_writel(tmp,S3C64XX_GPMDAT);

//printk("S3C64XX_GPMCON is %x\n",__raw_readl(S3C64XX_GPMCON));
//printk("S3C64XX_GPMDAT is %x\n",__raw_readl(S3C64XX_GPMDAT));
//printk("S3C64XX_GPMPUD is %x\n",__raw_readl(S3C64XX_GPMPUD));

printk(DEVICE_NAME " initialized\n");

return 0;
}

static void __exit s3c6410_leds_exit(void)
{
cdev_del(&cdev_leds);

unregister_chrdev_region(MKDEV(LED_MAJOR,0),1);

printk(KERN_NOTICE "s3c2440_leds_exit\n");
}


module_init(s3c6410_leds_init);
module_exit(s3c6410_leds_exit);

MODULE_LICENSE("GPL");

int main(void)
{
int on=1;
int led;
int fd;

fd = open("/dev/leds",0);
if(fd<0)
{
perror("open device leds");
exit(1);
}

printf("leds test show.press ctrl+c to exit\n");
while(1)
{
for(led=0;led<4;led++)
{
ioctl(fd,on,led);
usleep(60000);
}
on = !on;
}
close(fd);
return 0;
}



PS：
图片是在飞凌的技术论坛截的图，原版的可以在www.witech.com.cn里看。

七瓣雪

自己来顶！！