实现开发板三盏灯点亮熄灭

本文主要是介绍实现开发板三盏灯点亮熄灭，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

实现开发板三盏灯点亮熄灭

typedef struct {volatile unsigned int MODER;   // 0x00volatile unsigned int OTYPER;  // 0x04volatile unsigned int OSPEEDR; // 0x08volatile unsigned int PUPDR;   // 0x0Cvolatile unsigned int IDR;     // 0x10volatile unsigned int ODR;     // 0x14volatile unsigned int BSRR;    // 0x18volatile unsigned int LCKR;    // 0x1C volatile unsigned int AFRL;    // 0x20 volatile unsigned int AFRH;    // 0x24volatile unsigned int BRR;     // 0x28volatile unsigned int res;volatile unsigned int SECCFGR; // 0x30}gpio_t;#define  GPIOE  (0x50006000)
#define  GPIOF   (0x50007000)

• 三盏灯逻辑 kbuf[0]：表示操作哪一盏灯 kbuf[1]：表示操作灯的状态
• kbuf[0] = 1==> 操作LED1 ==> kbuf[1] = 1 点亮 kbuf[1] = 0 熄灭
• kbuf[0] = 2 ==> 操作LED2 ==> kbuf[1] = 1 点亮 kbuf[1] = 0 熄灭
• kbuf[0] = 3 ==> 操作LED3 ==> kbuf[1] = 1 点亮 kbuf[1] = 0 熄灭

 

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uacce.h>
#include <linux/io.h>
#include "myled.h"#define CNAME "myled"
unsigned int major = 0;
char kbuf[100] = "";unsigned int *rcc_virt = NULL;
gpio_t *gpioe_virt = NULL;
gpio_t *gpiof_virt = NULL;#define LED1_ON (gpioe_virt->ODR |= (0x1 << 10))
#define LED1_OFF (gpioe_virt->ODR &= (~(0x1 << 10)))
#define LED2_ON (gpiof_virt->ODR |= (0x1 << 10))
#define LED2_OFF (gpiof_virt->ODR &= (~(0x1 << 10)))
#define LED3_ON (gpioe_virt->ODR |= (0x1 << 8))
#define LED3_OFF (gpioe_virt->ODR &= (~(0x1 << 8)))gpio_t gpio;int myled_open(struct inode *inode, struct file *file)
{printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);return 0;
}
ssize_t myled_write(struct file *file, const char __user *ubuf, size_t size, loff_t *loffs)
{int ret;printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);if (size > sizeof(kbuf))size = sizeof(kbuf);ret = copy_from_user(kbuf, ubuf, size);if (ret){printk("copy from user is error\n");return -EIO;}switch (kbuf[0]){case 1:if (kbuf[1] == 1){LED1_ON;}else{LED1_OFF;}break;case 2:if (kbuf[1] == 1){LED2_ON;}else{LED2_OFF;}break;case 3:if (kbuf[1] == 1){LED3_ON;}else{LED3_OFF;}break;default:break;}return size;
}
int myled_close(struct inode *inode, struct file *file)
{printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);return 0;
}const struct file_operations fops = {.open = myled_open,.write = myled_write,.release = myled_close,
};static int __init demo_init(void)
{// 注册字符设备驱动major = register_chrdev(0, CNAME, &fops);if (major < 0){printk("register chrdev is error\n");return -EIO;}printk("major = %d\n", major);rcc_virt = ioremap(RCC_MP_AHB4ENSETR, 4);if (rcc_virt == NULL){printk("ioremap rcc is error\n");return -EIO;}gpioe_virt = ioremap(GPIOE, sizeof(gpio));if (gpioe_virt == NULL){printk("ioremap gpioe moder is error\n");return -EIO;}gpiof_virt = ioremap(GPIOF, sizeof(gpio));if (gpiof_virt == NULL){printk("ioremap gpiof is error\n");return -EIO;}*rcc_virt |= (0x3 << 4);gpioe_virt->MODER &= (~(0x3 << 20));gpioe_virt->MODER |= (0x1 << 20);gpioe_virt->ODR |= (0x1 << 10);gpiof_virt->MODER &= (~(0x3 << 20));gpiof_virt->MODER |= (0x1 << 20);gpiof_virt->ODR |= (0x1 << 10);gpioe_virt->MODER &= (~(0x3 << 16));gpioe_virt->MODER |= (0x1 << 16);gpioe_virt->ODR |= (0x1 << 8);return 0;
}
static void __exit demo_exit(void)
{iounmap(gpiof_virt);iounmap(gpioe_virt);iounmap(rcc_virt);// 注销字符设备驱动unregister_chrdev(major, CNAME);
}
module_init(demo_init);
module_exit(demo_exit);
MODULE_LICENSE("GPL");

#ifndef __MYLED_H__
#define __MYLED_H__typedef struct {volatile unsigned int MODER;   // 0x00volatile unsigned int OTYPER;  // 0x04volatile unsigned int OSPEEDR; // 0x08volatile unsigned int PUPDR;   // 0x0Cvolatile unsigned int IDR;     // 0x10volatile unsigned int ODR;     // 0x14volatile unsigned int BSRR;    // 0x18volatile unsigned int LCKR;    // 0x1C volatile unsigned int AFRL;    // 0x20 volatile unsigned int AFRH;    // 0x24volatile unsigned int BRR;     // 0x28volatile unsigned int res;volatile unsigned int SECCFGR; // 0x30}gpio_t;#define RCC_MP_AHB4ENSETR 0x50000A28
// #define GPIOE_MODER 0x50006000
// #define GPIOE_ODR 0x50006014#define  GPIOE   (0x50006000)
#define  GPIOF   (0x50007000)#endif

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>int main(int argc, char const *argv[])
{char buf[128] = "";int fd = -1;fd = open("/dev/myled", O_RDWR);if (fd == -1){perror("open is error");exit(1);}// buf[0]=1 led1 buf[0]=2 led2 buf[0]=3 led3//  buf[1]=0灭  buf[1]=1亮while (1){buf[0] = 1;buf[1] = 1;write(fd, buf, sizeof(buf));sleep(1);buf[1] = 0;write(fd, buf, sizeof(buf));sleep(1);buf[0] = 2;buf[1] = 1;write(fd, buf, sizeof(buf));sleep(1);buf[1] = 0;write(fd, buf, sizeof(buf));sleep(1);buf[0] = 3;buf[1] = 1;write(fd, buf, sizeof(buf));sleep(1);buf[1] = 0;write(fd, buf, sizeof(buf));sleep(1);}close(fd);return 0;
}

这篇关于实现开发板三盏灯点亮熄灭的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---