idea6410的蜂鸣器驱动（非PWM）

//--------------------------------------------------------------------------------------------

// 作者：longtian635241（longtian_huang@urbetter.com）

// 论坛ID：idea6410

// 版权：idea6410

// 平台：友坚idea6410开发板

// 发布日期：2012-11-22

// 最后修改：2012-11-22

//

//----------------------------------------------------------------------------------------------





1、驱动源码：

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/fs.h>

#include <linux/init.h>

#include <linux/miscdevice.h>

#include <linux/delay.h>

#include <asm/uaccess.h>

#include <linux/device.h>

#include <linux/cdev.h>

#include <asm/irq.h>

#include <mach/gpio.h>

#include <mach/map.h>

#include <mach/regs-gpio.h>

#include <plat/gpio-cfg.h>

#include <mach/hardware.h>

#include <linux/io.h>



#define BUZZER_MAJOR 240

#define S3C64XX_GPFCON (S3C64XX_GPF_BASE + 0x00)

#define S3C64XX_GPFDAT (S3C64XX_GPF_BASE + 0x04)

#define BUZZER_NAME "6410buzzer"

int buzzer_open(struct inode *inode, struct file *filp)

{

unsigned int tmp;

tmp = readl(S3C64XX_GPFCON);

tmp = (tmp & ~(0xc0000000)|(0x40000000)); //set the GPIO output mode

writel(tmp, S3C64XX_GPFCON);

printk("$$$$$$$$$$$buzzer_open$$$$$$$$$\n");

return 0;

}



ssize_t buzzer_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos)

{

printk("$$$$$$$$$$buzzer_read$$$$$$$$$\n");

return count;

}





ssize_t buzzer_write(struct file *filp, char __user *buf, size_t count, loff_t *f_pos)

{

char mbuf[10];

unsigned int tmp;

copy_from_user(mbuf,buf,count);



switch(mbuf[0])

{

case 0:

tmp = readl(S3C64XX_GPFDAT);

tmp |= (0x8000);

writel(tmp, S3C64XX_GPFDAT);

break;

case 1:

tmp = readl(S3C64XX_GPFDAT);

tmp &= ~(0x8000);

writel(tmp, S3C64XX_GPFDAT);

break;

default:

break;

}



printk("$$$$$$$$$$buzzer_write$$$$$$$$$\n");

return count;

}



int buzzer_release(struct inode *inode, struct file *filp)

{

printk("$$$$$$$$$$buzzer_release$$$$$$$$$\n");

return 0;

}



struct file_operations my_fops = {

.owner = THIS_MODULE,

.open = buzzer_open,

.read = buzzer_read,

.write = buzzer_write,

.release = buzzer_release,

};

static struct class *buzzer_class;

static int buzzer_init(void)

{

int rc;

printk("Test buzzer dev\n");

rc = register_chrdev(BUZZER_MAJOR, "BUZZER_NAME", &my_fops);

if(rc < 0)

{

printk("register %s dev error\n", "BUZZER_NAME");

return -1;

}

printk("$$$$$$$$$ register buzzer dev OK\n");

buzzer_class = class_create(THIS_MODULE, BUZZER_NAME);

if(IS_ERR(buzzer_class))

{

printk( " register class falid!\n","BUZZER_NAME");

return -1;

}

//创建一个设备节点，设备名为BUZZER_NAME，即:6410buzzer

device_create(buzzer_class, NULL, MKDEV(BUZZER_MAJOR, 0), NULL, BUZZER_NAME);



return 0;

}





static void buzzer_exit(void)

{

unregister_chrdev(BUZZER_MAJOR, "BUZZER_NAME");

device_destroy(buzzer_class, MKDEV(BUZZER_MAJOR, 0));

class_destroy(buzzer_class);

printk("Good Bye!\n");

}



MODULE_LICENSE("GPL");

module_init(buzzer_init);

module_exit(buzzer_exit);

2、测试源码

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <termios.h> //POSIX 终端控制定义

#include <unistd.h> //Unix 标准函数定义

#include <stdlib.h>

#define DEVICE "/dev/6410buzzer"

static int getch(void) //定义函数在终端上获得输入，并把输入的量（int）返回

{

struct termios oldt,newt; //终端结构体struct termios

int ch;

if (!isatty(STDIN_FILENO)) { //判断串口是否与标准输入相连

fprintf(stderr, "this problem should be run at a terminal\n");

exit(1);

}

// save terminal setting

if(tcgetattr(STDIN_FILENO, &oldt) < 0) { //获取终端的设置参数

perror("save the terminal setting");

exit(1);

}

// set terminal as need

newt = oldt;

newt.c_lflag &= ~( ICANON | ECHO ); //控制终端编辑功能参数ICANON 表示使用标准输入模式；参数ECH0 表示显示输入字符

if(tcsetattr(STDIN_FILENO,TCSANOW, &newt) < 0) { //保存新的终端参数

perror("set terminal");

exit(1);

}

ch = getchar();

// restore termial setting

if(tcsetattr(STDIN_FILENO,TCSANOW,&oldt) < 0) { //恢复保存旧的终端参数

perror("restore the termial setting");

exit(1);

}

return ch;

}

int main(void)

{

int fd, i;

char buf[10] = {0, 1};

fd = open(DEVICE, O_RDWR);

if(fd < 0)

{

printf("Open /dev/6410buzzer file error\n");

return -1;

}



while(1)

{

char key;

key = getch();

if(key=='0') //输入字符0即退出

break;

write(fd, &buf[0], 1);

usleep(10000);

write(fd, &buf[1], 1);

usleep(10000);

}

close(fd);

return 0;

}

3:、编译进内核linux-3.6.6的配置：

为了和pwm-beeper对照所以我把他放在了：Y:\linux-3.6.6\drivers\input\misc目录下，本来本驱动是字符驱动，你可以放在drivers\char目录下！

a、修改Kconfig

config INPUT_PWM_BEEPER

tristate "PWM beeper support"

#add by hcm

# select H***E_PWM

depends on H***E_PWM

help

Say Y here to get support for PWM based beeper devices.

If unsure, say N.

To compile this driver as a module, choose M here: the module will be

called pwm-beeper.

#add by hcm

config INPUT_PWM_6410BEEPER

tristate "PWM 6410beeper support"

depends on H***E_PWM

help

this is buzzer driver for s3c6410

Say Y here to get support for PWM based beeper devices.

If unsure, say N.

To compile this driver as a module, choose M here: the module will be

called pwm-beeper.

b、修改makefile

#add by hcm

obj-$(CONFIG_INPUT_PWM_6410BEEPER) += pwm-6410beeper.o

c、make menuconfig

System Type --->

| | [*] MMU-based Paged Memory Management Support | |

| | ARM system type (Samsung S3C64XX) ---> | |

| | *** Boot options *** | |

| | [*] S3C Reboot on decompression error | |

| | [*] Force UART FIFO on during boot process | |

| | (0) S3C UART to use for low-level messages | |

| | (0) Number of additional GPIO pins | |

| | (0) Space between gpio banks | |

| | [ ] ADC common driver support | |

| | [*] PWM device support

Input device support --->

[*] Miscellaneous devices --->

| | < > User level driver support | |

| | < > PCF8574 Keypad input device | |

| | < > PWM beeper support | |

| | <*> PWM 6410beeper support | |

| | < > Rotary encoders connected to GPIO pins

d、编译pwm-test.c

arm-linux-gcc -o pwm-test pwm-test.c

拷贝进系统运行即可听到声音！

[root@urbetter /]# ./pwm-test1

$$$$$$$$$$$buzzer_open$$$$$$$$$

$$$$$$$$$$buzzer_write$$$$$$$$$

$$$$$$$$$$buzzer_write$$$$$$$$$

$$$$$$$$$$buzzer_release$$$$$$$$$（0退出）