嵌入式实训-LED显示+文件系统定制实验报告

LED显示控制+文件系统定制系名：专业：指导教师：姓名：学号：班级：组员：科目：二○一年月目录一、设计任务和技术要求:.二、器件介绍……………三、设计代码：………………………….四、设计结果：..五、系统评价：.六、心得体会：.一、设计任务和技术要求:编写LED驱动程序，驱动程序采用手动定义设备名称〔自己姓名拼音_led〕和主设备号，设备号必须是系统尚未使用的设备号编写对应驱动的makefile文件将驱动程序编译成模块，并实现模块的加载及卸载编写驱动测试程序，要求运行该测试程序后，能够对led设备翻开成功与否做出判断；能够显示led控制菜单项选择项〔至少2个控制选项〕，例如，选择“1〞，led等循环点亮；选择“2〞，指定led1灯点亮编写对应测试程序的makefile文件文件系统定制要求：制作文件系统类型为yaffs的文件系统；文件系统启动时显示小组成员信息；文件系统启动时需要按提示输入用户名信息；文件系统成功挂载后,通过串口传送刚刚编写的led控制程序，并运行该led控制程序，要求能够按照规定的控制方式实现led灯的控制二、设计代码程序清单：应用程序测试leds_test.c如下：#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<sys/ioctl.h>#defineIOCTL_LED_ON1#defineIOCTL_LED_OFF5#defineIOCTL_LED_RUN3voidusage(char*exename){ printf("Usage:\n"); printf("%s<led_no><on/off>\n",exename); printf("led_no=1,2,3or4\n");}intmain(intargc,char**argv){ unsignedintled_no; intfd=-1;unsignedintcount=10; if(argc>3||argc==1) gotoerr; fd=open("/dev/cylled",0);//翻开设备 if(fd<0){ printf("Can'topen/dev/fdwled,\n"); return-1; } if(argc==2){ if(!strcmp(argv[1],"run")) { ioctl(fd,IOCTL_LED_RUN,count);//运行跑马灯}else{ gotoerr; } } if(argc==3){ led_no=strtoul(argv[1],NULL,0)-1;//操作哪个LED？ if(led_no>3) gotoerr; if(!strcmp(argv[2],"on")){ ioctl(fd,IOCTL_LED_ON,led_no);//点亮 }elseif(!strcmp(argv[2],"off")){ ioctl(fd,IOCTL_LED_OFF,led_no);//熄灭 }else{ gotoerr; } } close(fd); return0;err:按键驱动：/*

*linux/drivers/char/mini210_buttons.c

*

*Thisprogramisfreesoftware;youcanredistributeitand/ormodify

*itunderthetermsoftheGNUGeneralPublicLicenseversion2as

*publishedbytheFreeSoftwareFoundation.

*/

#include<linux/module.h>

#include<linux/kernel.h>

#include<linux/fs.h>

#include<linux/init.h>

#include<linux/delay.h>

#include<linux/poll.h>

#include<linux/irq.h>

#include<asm/irq.h>

#include<asm/io.h>

#include<linux/interrupt.h>

#include<asm/uaccess.h>

#include<mach/hardware.h>

#include<linux/platform_device.h>

#include<linux/cdev.h>

#include<linux/miscdevice.h>

#include<mach/map.h>

#include<mach/gpio.h>

#include<mach/regs-clock.h>

#include<mach/regs-gpio.h>

#defineDEVICE_NAME"buttons"

structbutton_desc{

intgpio;

intnumber;

char*name;

structtimer_listtimer;

};

staticstructbutton_descbuttons[]={

{S5PV210_GPH2(0),0,"KEY0"},

{S5PV210_GPH2(1),1,"KEY1"},

{S5PV210_GPH2(2),2,"KEY2"},

{S5PV210_GPH2(3),3,"KEY3"},

{S5PV210_GPH3(0),4,"KEY4"},

{S5PV210_GPH3(1),5,"KEY5"},

{S5PV210_GPH3(2),6,"KEY6"},

{S5PV210_GPH3(3),7,"KEY7"},

};

staticvolatilecharkey_values[]={

'0','0','0','0','0','0','0','0'

};

staticDECLARE_WAIT_QUEUE_HEAD(button_waitq);

staticvolatileintev_press=0;

staticvoidmini210_buttons_timer(unsignedlong_data)

{

structbutton_desc*bdata=(structbutton_desc*)_data;

intdown;

intnumber;

unsignedtmp;

tmp=gpio_get_value(bdata->gpio);

/*activelow*/

down=!tmp;

printk("KEY%d:%08x\n",bdata->number,down);

number=bdata->number;

if(down!=(key_values[number]&1)){

key_values[number]='0'+down;

ev_press=1;

wake_up_interruptible(&button_waitq);

}

}

staticirqreturn_tbutton_interrupt(intirq,void*dev_id)

{

structbutton_desc*bdata=(structbutton_desc*)dev_id;

mod_timer(&bdata->timer,jiffies+msecs_to_jiffies(40));

returnIRQ_HANDLED;

}

staticintmini210_buttons_open(structinode*inode,structfile*file)

{

intirq;

inti;

interr=0;

for(i=0;i<ARRAY_SIZE(buttons);i++){

if(!buttons[i].gpio)

continue;

setup_timer(&buttons[i].timer,mini210_buttons_timer,

(unsignedlong)&buttons[i]);

irq=gpio_to_irq(buttons[i].gpio);

err=request_irq(irq,button_interrupt,IRQ_TYPE_EDGE_BOTH,

buttons[i].name,(void*)&buttons[i]);

if(err)

break;

}

if(err){

i--;

for(;i>=0;i--){

if(!buttons[i].gpio)

continue;

irq=gpio_to_irq(buttons[i].gpio);

disable_irq(irq);

free_irq(irq,(void*)&buttons[i]);

del_timer_sync(&buttons[i].timer);

}

return-EBUSY;

}

ev_press=1;

return0;

}

staticintmini210_buttons_close(structinode*inode,structfile*file)

{

intirq,i;

for(i=0;i<ARRAY_SIZE(buttons);i++){

if(!buttons[i].gpio)

continue;

irq=gpio_to_irq(buttons[i].gpio);

free_irq(irq,(void*)&buttons[i]);

del_timer_sync(&buttons[i].timer);

}

return0;

}

staticintmini210_buttons_read(structfile*filp,char__user*buff,

size_tcount,loff_t*offp)

{

unsignedlongerr;

if(!ev_press){

if(filp->f_flags&O_NONBLOCK)

return-EAGAIN;

else

wait_event_interruptible(button_waitq,ev_press);

}

ev_press=0;

err=copy_to_user((void*)buff,(constvoid*)(&key_values),

min(sizeof(key_values),count));

returnerr?-EFAULT:min(sizeof(key_values),count);

}

staticunsignedintmini210_buttons_poll(structfile*file,

structpoll_table_struct*wait)

{

unsignedintmask=0;

poll_wait(file,&button_waitq,wait);

if(ev_press)

mask|=POLLIN|POLLRDNORM;

returnmask;

}

staticstructfile_operationsdev_fops={

.owner=THIS_MODULE,

.open=mini210_buttons_open,

.release=mini210_buttons_close,

.read=mini210_buttons_read,

.poll=mini210_buttons_poll,

};

staticstructmiscdevicemisc={

.minor=MISC_DYNAMIC_MINOR,

.name=DEVICE_NAME,

.fops=&dev_fops,

};

staticint__initbutton_dev_init(void)

{

intret;

ret=misc_register(&misc);

printk(DEVICE_NAME"\tinitialized\n");

returnret;

}

staticvoid__exitbutton_dev_exit(void)

{

misc_deregister(&misc);

}

module_init(button_dev_init);

module_exit(button_dev_exit);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("FriendlyARMInc.");程序cylled.c如下〔基于实验11的代码进行更改〕：#include<linux/kernel.h>#include<linux/module.h>#include<linux/miscdevice.h>#include<linux/fs.h>#include<linux/types.h>#include<linux/moduleparam.h>#include<linux/slab.h>#include<linux/ioctl.h>#include<linux/cdev.h>#include<linux/delay.h>#include<mach/gpio.h>#include<mach/regs-gpio.h>#include<plat/gpio-cfg.h>#defineDEVICE_NAME"cylled"#defineLED_MAJOR222#defineIOCTL_LED_ON1#defineIOCTL_LED_OFF5#defineIOCTL_LED_RUN3%定义三个宏#defineLED_NUM ARRAY_SIZE(led_gpios)staticintled_gpios[]={ S5PV210_GPJ2(0), S5PV210_GPJ2(1), S5PV210_GPJ2(2), S5PV210_GPJ2(3),};staticlongmini210_leds_ioctl(structfile*filp,unsignedintcmd,unsignedlongarg){ inti; intj; switch(cmd) { caseIOCTL_LED_RUN:%定义RUN，用了两个for循环。 for(i=0;i<arg;i++) { for(j=0;j<4;j++) { gpio_set_value(led_gpios[j],0); msleep(100); gpio_set_value(led_gpios[j],1); } } break; caseIOCTL_LED_ON: if(arg>LED_NUM) { return-EINVAL; } gpio_set_value(led_gpios[arg],0); break; caseIOCTL_LED_OFF: if(arg>LED_NUM) { return-EINVAL; } gpio_set_value(led_gpios[arg],1); break; default: return-EINVAL; } return0;}staticstructfile_operationsmini210_led_dev_fops={ .owner =THIS_MODULE, .unlocked_ioctl=mini210_leds_ioctl,};staticint__initmini210_led_dev_init(void){ intret; inti; for(i=0;i<LED_NUM;i++) { ret=gpio_request(led_gpios[i],"LED"); if(ret) { printk("%s:requestGPIO%dforLEDfailed,ret=%d\n",DEVICE_NAME,led_gpios[i],ret); returnret; } s3c_gpio_cfgpin(led_gpios[i],S3C_GPIO_OUTPUT); gpio_set_value(led_gpios[i],1); } ret=register_chrdev(LED_MAJOR,DEVICE_NAME,&mini210_led_dev_fops); if(ret<0) { printk("%scan'tregi