本文共 4826 字，大约阅读时间需要 16 分钟。

20150223 IMX257 BEEP驱动程序实现

2015-02-23 李海沿

和我们今天上午编写的LED驱动程序一样，此处我们实现一个beep蜂鸣器的鸣叫驱动程序

我们知道我们蜂鸣器的引脚由 GPIO1_26控制的，所以我们此处只需要将前面led驱动程序的相关引脚修改为GPIO1_26 就可以了

（和前面几乎一样，LED驱动程序参考：）

1.确定相关寄存器基址

确定IOMUX地址 0x43fa_c000 0x43fa_ffff

GPIO1的地址 0x53fc_c000 0x53fc_ffff

MUX_CTL寄存器偏移地址 0x011c

PAD-CTL 寄存器偏移 0x0314

GPIO寄存器偏移地址

2.编译测试

本驱动程序亲测成功：

附上驱动程序代码：

1 #include
   
      2 #include
    
       3 #include
     
        4 #include
      
         5 #include
       
          6 #include
        
          7 #include
         
           8 #include
          
            9 #include
           
             10 #include
            
              11 #include
             
               12 #include
              
                13 #include 
               
                 14 15 #define Driver_NAME "beep_dev" 16 #define DEVICE_NAME "beep_dev" 17 18 static int major = 0; 19 20 //auto to create device node 21 static struct class *drv_class = NULL; 22 static struct class_device *drv_class_dev = NULL; 23 24 //beep 25 //寄存器基址; 26 static unsigned long mem_iomux; 27 static unsigned long mem_gpio1; 28 static unsigned long base_iomux; //iomux基址 0X 43FA C000 - 0X 43FA FFFF 29 static unsigned long base_gpio1; //gpio3 0X 53FC C000 - 0X 53FC FFFF 30 // MUX_CTL模式选择 配置寄存器 31 #define MUX_CTL (*(volatile unsigned long *)(base_iomux + 0x011c)) 32 // PAD_CTL GPIO常用功能设置 33 #define PAD_CTL (*(volatile unsigned long *)(base_iomux + 0x0314)) 34 // GPIO DR 数据寄存器 DR 35 #define DR_GPIO1 (*(volatile unsigned long *)(base_gpio1 + 0x0000)) 36 // GPIO GDIR 方向控制寄存器 GDIR 37 #define GDIR_GPIO1 (*(volatile unsigned long *)(base_gpio1 + 0x0004)) 38 39 40 static int key_open(struct inode *inode, struct file *file) 41 { 42 printk("<0>function open!\n\n"); 43 return 0; 44 } 45 46 static int key_read(struct file *filp, char __user *buff, size_t count, loff_t *offp) 47 { 48 return 0; 49 } 50 51 static ssize_t key_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos) 52 { 53 printk("<0>function write!\n\n"); 54 return 1; 55 } 56 57 static int key_release(struct inode *inode, struct file *filp) 58 { 59 printk("<0>function write!\n\n"); 60 return 0; 61 } 62 63 static int key_ioctl(struct inode *inode,struct file *flip,unsigned int command,unsigned long arg) 64 { 65 printk("<0>function ioctl!\n\n"); 66 return 0; 67 } 68 static struct file_operations key_fops = { 69 .owner = THIS_MODULE, /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */ 70 .open = key_open, 71 .read = key_read, 72 .write = key_write, 73 .release= key_release, 74 .ioctl = key_ioctl, 75 }; 76 77 void gpio_addr(void){ 78 printk("<0>addr base_iomux : %x \n",base_iomux); 79 printk("<0>addr base_gpio1 : %x \n",base_gpio1); 80 printk("<0>addr MUX_CTL : %x \n",&MUX_CTL); 81 printk("<0>addr PAD_CTL : %x \n",&PAD_CTL); 82 printk("<0>addr GDIR_GPIO1 : %x \n",&GDIR_GPIO1); 83 printk("<0>addr DR_GPIO1 : %x \n",&DR_GPIO1); 84 } 85 86 void beep_on_off(void){ 87 ssleep(1); 88 DR_GPIO1 |= (0x01 << 26); //将GPIO1_26置1 89 ssleep(1); 90 DR_GPIO1 &= ~(0x01 << 26); //将GPIO1_26清零 91 ssleep(1); 92 DR_GPIO1 |= (0x01 << 26); //将GPIO1_26置1 93 ssleep(1); 94 DR_GPIO1 &= ~(0x01 << 26); //将GPIO1_26清零 95 ssleep(1); 96 DR_GPIO1 |= (0x01 << 26); //将GPIO1_26置1 97 ssleep(1); 98 DR_GPIO1 &= ~(0x01 << 26); //将GPIO1_26清零 99 ssleep(1);100 DR_GPIO1 |= (0x01 << 26); //将GPIO1_26置1101 ssleep(1);102 DR_GPIO1 &= ~(0x01 << 26); //将GPIO1_26清零103 ssleep(1);104 DR_GPIO1 |= (0x01 << 26); //将GPIO1_26置1105 ssleep(1);106 DR_GPIO1 &= ~(0x01 << 26); //将GPIO1_26清零107 }108 109 static int __init key_irq_init(void)110 {111 printk("<0>\nHello,this is %s module!\n\n",Driver_NAME);112 //register and mknod113 major = register_chrdev(0,Driver_NAME,&key_fops);114 drv_class = class_create(THIS_MODULE,Driver_NAME);115 drv_class_dev = device_create(drv_class,NULL,MKDEV(major,0),NULL,DEVICE_NAME); /*/dev/key_query*/116 117 //IO端口申请 ioremap 可以直接通过指针来访问这些地址118 base_iomux = ioremap(0x43FAC000,0xFFF);119 base_gpio1 = ioremap(0x53FCC000,0xFFF);120 121 //MUX_CTL122 MUX_CTL &= ~(0x07 << 0); 123 MUX_CTL |= (0X05 << 0); //设置为ALT5 GPIO1_26 BEEP124 //PAD_CTL125 PAD_CTL &= ~(0x01<<13 | 0x01<<3 | 0x03<<1 | 0x01<<0); //1.8v 不需要上拉下拉 CMOS输出 slew rate126 //GDIR_GPIO1 配置为输出模式127 GDIR_GPIO1 &= ~(0x01 << 26); 128 GDIR_GPIO1 |= (0x01 << 26); //配置为输出模式 129 130 //DR_GPIO1 配置为输出0 点亮ERR_LED131 DR_GPIO1 &= ~(0x01 << 26); //将GPIO1_26清零132 DR_GPIO1 &= ~(0x01 << 26); //将GPIO1_26清零133 gpio_addr();134 beep_on_off();135 return 0; 136 }137 138 static void __exit key_irq_exit(void)139 {140 gpio_addr();141 printk("<0>\nGoodbye,%s!\n\n",Driver_NAME);142 beep_on_off();143 144 unregister_chrdev(major,Driver_NAME);145 device_unregister(drv_class_dev);146 class_destroy(drv_class);147 148 //释放IO端口149 iounmap(base_iomux);150 iounmap(base_gpio1);151 }152 153 154 /* 这两行指定驱动程序的初始化函数和卸载函数 */155 module_init(key_irq_init);156 module_exit(key_irq_exit);157 158 /* 描述驱动程序的一些信息，不是必须的 */159 MODULE_AUTHOR("Lover雪儿");160 MODULE_VERSION("0.1.0");161 MODULE_DESCRIPTION("IMX257 key Driver");162 MODULE_LICENSE("GPL");
               
              
             
            
           
          
         
        
       
      
     
    
   

View Code

转载地址：https://ciellee.blog.csdn.net/article/details/82599459 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！