（驱动）简单定时器编写练习（2014/8/23）

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/*定时点亮LED然后定时熄灭*/#include <linux/init.h>#include <linux/module.h>#include <linux/fs.h>#include <linux/delay.h>#include <linux/jiffies.h>#include <linux/timer.h>#include <asm/uaccess.h>#include <asm/io.h>volatile unsigned long virt,phys = 0xe0200280;volatile unsigned long *GPJ2CON,*GPJ2DAT;struct timer_list time1;struct timer_list time2;static void init(void){virt = (unsigned long)ioremap(phys,0x8);GPJ2CON = (unsigned long *)(virt + 0x00);GPJ2DAT = (unsigned long *)(virt + 0x04);*GPJ2CON &= 0xffff0000;*GPJ2CON |= 0x00001111;*GPJ2DAT |= 0x0f;}static void led1(unsigned long data)//点亮LED{ *GPJ2DAT &= 0xf0;}static void led2(unsigned long data)//熄灭LED{*GPJ2DAT |= 0x0f;}static __init int test_init(void){init();

setup_timer(&time1,led1,NULL);time1.expires = jiffies + 1000;add_timer(&time1);  //定时器启动，等待触发。setup_timer(&time2,led2,NULL);        time2.expires = jiffies + 2000;        add_timer(&time2);return 0;}static __exit void test_exit(void){}module_init(test_init); module_exit(test_exit);  MODULE_LICENSE("GPL");MODULE_AUTHOR("henry");MODULE_DESCRIPTION("This is test demo");

在kernel/drivers/char下的Kconfig里面添加

config LED_TIME
tristate "LED TIME"
default y

在kernel/drivers/char下的Makefile里面添加

obj-m += led-time.o

在kernel下编译：$ make menuconfig

$ make modules

把 led-time.ko下载到开发板上：

$ tftp -g -r led-time.ko 192.168.x.x

装载模块：$ insmod led-time.ko

卸载模块：$ rmmod led-time.ko

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