网站推广都有哪些,问答系统网站建设,网站备案 太烦,作图网站都有哪些1.实验目的 编写LED灯的驱动#xff0c;在应用程序中编写控制LED灯亮灭的代码逻辑实现LED灯功能的控制#xff1b; 2.LED灯相关寄存器分析 LED1-PE10 LED1亮灭#xff1a; RCC寄存器[4]-1 0X50000A28 GPIOE_MODER[21:20]-01 (输出) 0X50006000 GPIOE_ODR[10]-在应用程序中编写控制LED灯亮灭的代码逻辑实现LED灯功能的控制 2.LED灯相关寄存器分析 LED1-PE10 LED1亮灭 RCC寄存器[4]-1 0X50000A28 GPIOE_MODER[21:20]-01 (输出) 0X50006000 GPIOE_ODR[10]-1(输出高电平) 0输出低电平0X50006014 LED2-PF10 LED2亮灭 RCC寄存器[5]-1 0X50000A28 GPIOE_MODER[21:20]-01 (输出) 0X50006000 GPIOE_ODR[10]-1(输出高电平) 0输出低电平0X50006014 LED3-PE8 LED3亮灭 RCC寄存器[4]-1 0X50000A28 GPIOE_MODER[17:16]-01 (输出) 0X50006000 GPIOE_ODR[8]-1(输出高电平) 0输出低电平0X50006014 GPIOE_OTYPER默认为00 GPIOE_PUPDR默认为0 GPIOE_OSPEEDR默认为00 3.编写代码
---Makefile---工程管理文件
modname?demo
arch?arm
ifeq ($(arch),arm)
KERNELDIR: /home/ubuntu/FSMP1A/linux-stm32mp-5.10.61-stm32mp-r2-r0/linux-5.10.61 #编译生成ARM架构
else
KERNELDIR:/lib/modules/$(shell uname -r)/build #编译生成X86架构
endifPWD:$(shell pwd) #模块化编译文件路径
all:make -C $(KERNELDIR) M$(PWD) modules
clean:make -C $(KERNELDIR) M$(PWD) cleanobj-m:$(modname).o---head.h---头文件
#ifndef __HEAD_H__
#define __HEAD_H__typedef struct
{unsigned int MODER;unsigned int OTYPER;unsigned int OSPEEDR;unsigned int PUPDR;unsigned int IDR;unsigned int ODR;
}gpio_t;//LED1和LED3寄存器地址
#define LED1_ADDR 0x50006000
#define LED2_ADDR 0x50007000
#define LED3_ADDR 0x50006000
#define RCC_ADDR 0x50000A28#endif
---mychrdev.c---驱动程序
#include linux/init.h
#include linux/module.h
#include linux/fs.h
#include linux/uaccess.h
#include linux/io.h
#include head.h
#includelinux/device.hchar kbuf[128] {0};
unsigned int major;
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
unsigned int *vir_rcc;struct class *cls;
struct device *dev;//封装操作方法
int mycdev_open(struct inode *inode, struct file *file)
{printk(%s:%s:%d\n,__FILE__,__func__,__LINE__);return 0;
}ssize_t mycdev_read(struct file *file, char *ubuf, size_t size, loff_t *lof)
{int ret;if(size sizeof(kbuf)){size sizeof(kbuf);}ret copy_to_user(ubuf,kbuf,size);if(ret){printk(copy_to_user err\n);return -EIO;}return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{unsigned long ret;if(size sizeof(kbuf)){size sizeof(kbuf);}ret copy_from_user(kbuf,ubuf,size);if(ret){printk(copy_from_user err\n); return -EIO; }switch(kbuf[0]){case 1:if(kbuf[1] 1) //开灯vir_led1-ODR | (0x1 10);else if(kbuf[1] 0) //关灯vir_led1-ODR (~(0x1 10));break;case 2:if(kbuf[1] 1) //开灯vir_led2-ODR | (0x1 10);else if(kbuf[1] 0) //关灯vir_led2-ODR (~(0x1 10));break;case 3:if(kbuf[1] 1) //开灯vir_led3-ODR | (0x1 8);else if(kbuf[1] 0) //关灯vir_led3-ODR (~(0x1 8));break;default:printk(输入错误\n); }return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{printk(%s:%s:%d\n,__FILE__,__func__,__LINE__);return 0;
}struct file_operations fops{.openmycdev_open,.readmycdev_read,.writemycdev_write,.releasemycdev_close,
};//相关寄存器地址映射及初始化
int all_led_init(void)
{//相关寄存器的内存映射vir_led1ioremap(LED1_ADDR,sizeof(gpio_t));if(vir_led1 NULL){printk(物理内存映射失败%d\n,__LINE__);return -ENOMEM;}vir_led2ioremap(LED2_ADDR,sizeof(gpio_t));if(vir_led2 NULL){printk(物理内存映射失败%d\n,__LINE__);return -ENOMEM;}vir_led3 vir_led1;vir_rccioremap(RCC_ADDR,4);if(vir_rcc NULL){printk(物理内存映射失败%d\n,__LINE__);return -ENOMEM;}printk(寄存器内存映射成功\n);//硬件寄存器的初始化(*vir_rcc) | (0x3 4);//LED1vir_led1-MODER (~(0x3 20));vir_led1-MODER | (0x1 20);vir_led1-ODR (~(0x1 10));//LED2vir_led2-MODER (~(0x3 20));vir_led2-MODER | (0x1 20);vir_led2-ODR (~(0x1 10));//LED3vir_led3-MODER (~(0x3 16));vir_led3-MODER | (0x1 16);vir_led3-ODR (~(0x1 8));printk(寄存器初始化成功\n);return 0;
}//入口函数
static int __init mycdev_init(void)
{major register_chrdev(0,mychrdev,fops);if(major 0){printk(字符设备驱动注册失败\n);return major;}printk(字符设备驱动注册成功:major%d\n,major);//寄存器映射及初始化all_led_init();//向上提交目录cls class_create(THIS_MODULE,mychrdev);if(IS_ERR(cls)){printk(向上提交目录失败\n);return -PTR_ERR(cls);}printk(向上提交目录成功\n);//向上提交设备节点信息int i;for(i0; i3; i){dev device_create(cls,NULL,MKDEV(major,i),NULL,mychrdev%d,i);if(IS_ERR(dev)){printk(向上提交设备节点信息失败\n);return -PTR_ERR(dev);}}printk(向上提交设备节点信息成功\n);return 0;
}//出口函数
static void __exit mycdev_exit(void)
{//销毁设备节点信息int i;for(i0; i3; i){device_destroy(cls,MKDEV(major,i));}//销毁目录信息class_destroy(cls);//取消物理内存的映射iounmap(vir_led1);iounmap(vir_led2);iounmap(vir_rcc);//字符设备驱动注销unregister_chrdev(major,mychrdev);
}//声明
//入口函数地址
module_init(mycdev_init);
//出口函数地址
module_exit(mycdev_exit);
//遵循的GPL协议
MODULE_LICENSE(GPL);
---test.c---应用程序测试程序
#include stdio.h
#include sys/types.h
#include sys/stat.h
#include fcntl.h
#include unistd.h
#include stdlib.h
#include string.hint main(int argc,char const *argv[])
{char buf[128]{0};int fd open(/dev/mychrdev0,O_RDWR);if(fd 0){printf(设备文件打开失败\n);exit(-1);}while(1){printf(第一个字符1(LED1) 2(LED2) 3(LED3)\n);printf(第二个字符1(开灯)0(关灯)\n);printf(输入控制灯的两个字符 );fgets(buf,sizeof(buf),stdin);buf[strlen(buf)-1] \0;//像设备文件中写write(fd,buf,sizeof(buf));}close(fd);return 0;
} 4.测试
