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1、LEDR1801K实验八LED驱动实验实验目的掌握字符设备驱动程序编写的框架:掌握设备驱动相关的知识；实验原理参考人课课件字符设备驱动程序框架.PPTK 硬件电路LED1LED1 OVDD SYS 3 3VLED2LED2 OVDD_SYS_3 3VLEDR1851KLED3LED3 OVDD SYS 3.3VLEDR19O1KLED4LED4OVDD_SYS_3.3VR1911KLED1LED2LED3LED4Xispl 2C0SCL/CA M_G PIO10/G P M 4_0Xispl2C0SDA/CAM_GPIO11/GPM4_1CA M_GP 1012/CAM_SP 11 _CLK/
2、G P M 4_2 CA M_G PIO13ZCA M_S PI1_n SS/G P M 4_3数据手册6.2.3.113 GPM4CONBase Address; 0x1100_0000Address = Base Address + 0x02E0f Reset Value = 0x0000 0000GPM4CON315:12RW0x0 = Input0x1 = Output0x2 = CAMJ2C1_SDA0x3 = CAM GPIC5130x4 = CAM_SPI1_nSS0x5 to OxE = Reserved0xF = EXTJNT1230x00GPM4CON211:8RW0x0
3、= Input0x1 = Output0x2 = CAM I2C1 SCL0x3 = CAM GPIO120x4 = CAM_SPI1_CLK0x5 to OxE = ReservedOxF = EXTJNT1220x00GPM4CON17:4RW0x0 = Input0x1 = Output0x2 = CAM I2C0 SDAOx3 = CAM-GPIO110x4 to OxE = ReservedOxF = EXTNT42 0x00NameBitTypoDescriptionReset ValueGPM4CON0【3:0RW0x0 = Input0x1 = Output0x2 = CAM
4、I2C0 SCL0x3 = CAMZGPIO100x4 to OxE = ReservedOxF = EXTJNT12(00x006.2.3.114 GPM4DAT Base Address: 0x1100_0000 Address = Base Address 0x02E4. Reset Value = 0x00NameBitTypoDescriptionRosot ValueGPM4DAT7:07：0RWXWhen you configure port as input port then corresponding bit is pin state. When configuring a
5、s output port then pin state should be same as corresp on ding bit. When the port is configured as functional pin. the undefined value will be read.0x00实验内容（1）应用层调用open方法打开设备文件时，四个led灯亮；close关闭文件时，灯灭。（2）应用层read时，读出LED亮灭的状态（一个字节）；（3）应用层write时，写入一个字节，字节的低4位控制灯的亮灭：如：二进制位：1111011111111011111111011111111
6、0表示第LED4灯亮 表示第LED3灯亮 表示第LED2灯亮 表示第LED!灯亮（4）驱动程序要能够自动建立设备文件（5）要求自己编写一个应用层的测试程序，在应用测试程序中，实现流水灯。配置编译内核General setup “(-xxxx) Local version - append to kernel release版本中加入自己的姓名拼音 样include #include 样include 挣include 样include 样include 样include 样include 挣include 編写硬件底层操作函数实现open,release,write,read创建一个 file
7、_operations 结构static iiit iiiit XXX_init(void)硬件寄存器映射申请设备号初始化cdev结构注册cdev结构创建 struct class创建device设备文件return 0;static void _exit XXX_exit(void)/雄销cdev结构注销设备号取消地址映射删除创建的device设备文件删除注册的classmodule_iiiit();module_iiiit();MODULE_LICENSE(.);要求手写实验报告（下周小课交）在实验报告中画出驱动层与应用层层次结构框图，源程序抄写在实验报告中!Leddrv：存include
8、 vlinux/modiile.h 存include 存include 存include 存include 存include 存include 存include 存include volatile unsigned long *vir_GPM4CON;volatile unsigned long *vir_GPM4DAT;static mt led_div_open(stmct inode *iinstnict file *fp)fi*vu_GPM4CON &=Oxffif;*vu_GPM4CON |= Oxllll;*vii_GPM4DAT &=Oxf;prmtk(Hall led on!i
9、T);return 0:static mt led_div_release(stnict inode *iiKStmct file *fp)fi*vuGPM4DAT |= Oxf;prmtk(Hall ledreturn 0:static unsigned char data=O:static ssize_t led_div_wnte(stmct file *fp5 const char _user *buf. size_t len. lofflt *offset) ficopy_fiom_user(&data、buf. 1);printk(,data=%dtl,data);*vii_GPM4
10、DAT = data;return 1;static ssize_t led_div_read(sti-uct file *fp, char _user *buf, size_t len, lofLt * offset)if(data&(l0) data = 1;else if(data&(11) data = 2; else if(data&(12) data = 3; else if(data&(13) data = 4; copy_to_user(buf, &data, 1);return 1;static stmct file_operations led_div_fops= owne
11、r=THIS MODULE. open = led_drv_open、.release = led_div_release, write = led_div_wfite, read = led_drv_read,； static stmct cdev *led_div-cdev;stmct class *led_class;static dev_t dev=0;static mt _uiit led_drv_imt(void)ivir_GPM4CON= ioremap(0x 110002e0. 8);vir GPM4DAT= vir GPM4CON+1;alloc_cliidev_region
12、(&dev, 0、1, Hled_deviceH);led_div_cdev = cdev_alloc();cdev_init(led_drv_cck; &hd_drv_fops);led div cdev-ownei-THIS MODULE:zcdev_add(led_div_cdev,dev, 1);led_class = class_create(THIS_MODULEJ,led_duH);/sys/clas&4ed_du7device_create(led_class, NULL. dev. NULL/,led_dev_fileH);/,7dev/led_dev_filenreturn
13、 0;static void _exit led_dnr_exit(void)fidevice_destiov(led_class? dev); class_destioy(led_class); cdev_del(led_div_cdev);umegister_cludev_region(dev, 1); iouimiap(vir_GPM4CON); module_init(led_div_init); module_exit(led_div_exit); MODULE_LICENSE(”GPLJ;Ledtest：存include 存include 存include 存include 存include mt mam(int argc, chai *aigv)imt i=0;unsigned char val = 1;unsigned char led_state=0;mt fd = open(,7dev/led_dev_file,O_RDVrR); sleep ；fbr(i=0;i12;i-H-)wiite(fd, &val,l);s
