【驱动开发】控制stm32mp157a开发板三盏灯的亮灭

编写应用程序控制三盏灯的亮灭

head.h：

#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;//LED灯的寄存器地址
#define LED1_ADDR 0X50006000
#define LED2_ADDR 0X50007000
#define LED3_ADDR 0X50006000
#define RCC_ADDR 0X50000A28#endif

demo.c：

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include "head.h"
#include <linux/device.h>char kbuf[128] = {};
unsigned int major;
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
// 定义指针指向映射后的虚拟内存
unsigned int *vir_rcc;// 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)
{printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);int ret;ret = copy_to_user(ubuf, kbuf, size);if (ret){printk("copy_to_user filed\n");return -EIO;}return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);int ret;ret = copy_from_user(kbuf, ubuf, size);if (ret){printk("copy_from_user filed\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;
}
// 定义操作方法结构体对象
struct file_operations fops = {.open = mycdev_open,.read = mycdev_read,.write = mycdev_write,.release = mycdev_close,
};
static int __init mycdev_init(void)
{// 注册字符设备驱动major = register_chrdev(0, "mychrdev", &fops);if (major < 0){printk("字符设备驱动注册失败\n");return major;}printk("注册字符设备驱动成功major=%d\n", major);// 进行寄存器的地址映射vir_led1 = ioremap(LED1_ADDR, sizeof(gpio_t));if (vir_led1 == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_led2 = ioremap(LED2_ADDR, sizeof(gpio_t));if (vir_led2 == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_led3 = ioremap(LED3_ADDR, sizeof(gpio_t));if (vir_led3 == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_rcc=ioremap(RCC_ADDR,4);if(vir_rcc == NULL){printk("物理内存映射失败%d\n",__LINE__);return -EFAULT;} printk("寄存器内存映射成功\n");// 寄存器初始化(*vir_rcc) |= (0x3 << 4); // GPIOE控制器时钟使能// 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;
}
static void __exit mycdev_exit(void)
{// 取消内存映射iounmap(vir_led1);iounmap(vir_led2);iounmap(vir_rcc);// 注销字符设备驱动unregister_chrdev(major, "mychrdev");return 0;
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

test.c：

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char const *argv[])
{char buf[128] = {0};int fd = open("/dev/mychrdev", O_RDWR);if (fd < 0){printf("打开设备文件失败\n");return -1;}printf("打开设备文件成功\n");while (1){printf("请输入要控制的灯：1(LED1) 2(LED2) 3(LED3)  >>>\n");printf("请输入您要进行的操作：1(开灯) 0(关灯)       >>>\n");printf("请输入控制灯的两个字符  >>> ");fgets(buf, sizeof(buf), stdin);    //在终端读一个字符串buf[strlen(buf) - 1] = '\0';write(fd, buf, sizeof(buf));       //将数据传递给内核}close(fd);return 0;
}