基於mini2440的mp3播放器

基於mini2440開發板和MADPLAY，用聲卡，按鍵實現MP3功能，通過mini2440的6個按鍵實現開始，暫停，上一首，下一首，音量+，音量-的功能，而且可以順序播放和隨機播放。

 

按鍵平臺驅動

 

device

 

#include <linux/device.h>
#include <linux/string.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/gpio.h>

static struct resource button_resource[]=
{
    [0] = {
              .start = IRQ_EINT8,
              .end = IRQ_EINT8,
              .flags = IORESOURCE_IRQ,
          },
    [1] = {
              .start = IRQ_EINT11,
              .end = IRQ_EINT11,
              .flags = IORESOURCE_IRQ,
          },
    [2] = {
              .start = IRQ_EINT13,
              .end = IRQ_EINT13,
              .flags = IORESOURCE_IRQ,
          },
    [3] = {
              .start = IRQ_EINT14,
              .end = IRQ_EINT14,
              .flags = IORESOURCE_IRQ,
          },
    [4] = {
              .start = IRQ_EINT15,
              .end = IRQ_EINT15,
              .flags = IORESOURCE_IRQ,
          },
    [5] = {
              .start = IRQ_EINT19,
              .end = IRQ_EINT19,
              .flags = IORESOURCE_IRQ,
          },
};

struct platform_device *my_button;

static int __init platform_dev_init(void)
{
    int ret;

    my_button = platform_device_alloc("my_button", -1);

    platform_device_add_resources(my_button,button_resource,6);


    ret = platform_device_add(my_button);

    if(ret)
    {
        platform_device_put(my_button);
    }

    return ret;
}

static void __exit platform_dev_exit(void)
{
    platform_device_unregister(my_button);
}

module_init(platform_dev_init);
module_exit(platform_dev_exit);

MODULE_AUTHOR("zxf");
MODULE_LICENSE("GPL");

 

driver

 

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/platform_device.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/gpio.h>

#define DEVICE_NAME     "buttons"

struct button_irq_desc {
    int irq;
    int pin;
    int pin_setting;
    int number;
    char *name;
};

static struct button_irq_desc button_irqs [] = {
    {IRQ_EINT8 , S3C2410_GPG(0) ,  S3C2410_GPG0_EINT8  , 0, "KEY0"},
    {IRQ_EINT11, S3C2410_GPG(3) ,  S3C2410_GPG3_EINT11 , 1, "KEY1"},
    {IRQ_EINT13, S3C2410_GPG(5) ,  S3C2410_GPG5_EINT13 , 2, "KEY2"},
    {IRQ_EINT14, S3C2410_GPG(6) ,  S3C2410_GPG6_EINT14 , 3, "KEY3"},
    {IRQ_EINT15, S3C2410_GPG(7) ,  S3C2410_GPG7_EINT15 , 4, "KEY4"},
    {IRQ_EINT19, S3C2410_GPG(11),  S3C2410_GPG11_EINT19, 5, "KEY5"},
};
static volatile char key_values [] = {'0', '0', '0', '0', '0', '0'};

static DECLARE_WAIT_QUEUE_HEAD(button_waitq);

static volatile int ev_press = 0;


static irqreturn_t buttons_interrupt(int irq, void *dev_id)
{
    struct button_irq_desc *button_irqs = (struct button_irq_desc *)dev_id;
    int down;

    // udelay(0);
    down = !s3c2410_gpio_getpin(button_irqs->pin);

    if (down != (key_values[button_irqs->number] & 1)) { // Changed

	key_values[button_irqs->number] = '0' + down;

        ev_press = 1;
        wake_up_interruptible(&button_waitq);
    }

    return IRQ_RETVAL(IRQ_HANDLED);
}


static int s3c24xx_buttons_open(struct inode *inode, struct file *file)
{
    int i;
    int err = 0;

    for (i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++) {
	if (button_irqs[i].irq < 0) {
		continue;
	}
        err = request_irq(button_irqs[i].irq, buttons_interrupt, IRQ_TYPE_EDGE_BOTH,
                          button_irqs[i].name, (void *)&button_irqs[i]);
        if (err)
            break;
    }

    if (err) {
        i--;
        for (; i >= 0; i--) {
	    if (button_irqs[i].irq < 0) {
		continue;
	    }
	    disable_irq(button_irqs[i].irq);
            free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
        }
        return -EBUSY;
    }

    ev_press = 1;

    return 0;
}


static int s3c24xx_buttons_close(struct inode *inode, struct file *file)
{
    int i;

    for (i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++) {
	if (button_irqs[i].irq < 0) {
	    continue;
	}
	free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
    }

    return 0;
}


static int s3c24xx_buttons_read(struct file *filp, char __user *buff, size_t count, loff_t *offp)
{
    unsigned long err;

    if (!ev_press) {
	if (filp->f_flags & O_NONBLOCK)
	    return -EAGAIN;
	else
	    wait_event_interruptible(button_waitq, ev_press);
    }

    ev_press = 0;

    err = copy_to_user(buff, (const void *)key_values, min(sizeof(key_values), count));

    return err ? -EFAULT : min(sizeof(key_values), count);
}

static unsigned int s3c24xx_buttons_poll( struct file *file, struct poll_table_struct *wait)
{
    unsigned int mask = 0;
    poll_wait(file, &button_waitq, wait);
    if (ev_press)
        mask |= POLLIN | POLLRDNORM;
    return mask;
}


static struct file_operations dev_fops = {
    .owner   =   THIS_MODULE,
    .open    =   s3c24xx_buttons_open,
    .release =   s3c24xx_buttons_close,
    .read    =   s3c24xx_buttons_read,
    .poll    =   s3c24xx_buttons_poll,
};

static struct miscdevice misc = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = DEVICE_NAME,
	.fops = &dev_fops,
};



static int my_plat_probe(struct platform_device *dev)
{
    int ret,i;
    struct resource *button_resource;
    struct platform_device *pdev = dev;

    printk("platform dirver mach platfrom device.\n");

    for( i=0; i < 6; i++ )
    {
        button_resource = platform_get_resource(pdev,IORESOURCE_IRQ,i);
        if( button_resource == NULL )
        {
            return -ENOENT;
        }
        button_irqs[i].irq = button_resource->start;
    }
    ret = misc_register(&misc);
    if(ret)
    {
        return ret;
    }
    return 0;
}

static int my_plat_remove(struct platform_device *dev)
{
    printk("my platfrom button has removed.\n");
    misc_deregister(&misc);
    return 0;
}

struct platform_driver my_button =
{
    .probe = my_plat_probe,
    .remove = my_plat_remove,
    .driver =
    {
        .owner = THIS_MODULE,
        .name = "my_button",
    },
};

static int __init platform_drv_init(void)
{
    int ret;
    ret = platform_driver_register(&my_button);
    printk (DEVICE_NAME"\tinitialized\n");
    return ret;
}

static void __exit platform_drv_exit(void)
{
    platform_driver_unregister(&my_button);
}

module_init(platform_drv_init);
module_exit(platform_drv_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("FriendlyARM Inc.");

 

source

 

modulechoose.c

 

#include"../include/mp3.h"

int module_choose( int buttons_fd,char *buttons)
{
    int i = 0;
    int flag = 1;
    int choose = 7;
    enum module { ran, list, quit };
    while(flag)
    {
        char current_buttons[6];
        printf("\n\n\n\n\n\n\n\n\t\t\t  play moudle choose\n\n\n");
//	printf("\t\t\t      K1:singal\n");
	printf("\t\t\t      k1:random\n");
	printf("\t\t\t      k2:list\n");
	printf("\t\t\t      k3:poweroff\n\n\n\n\n\n\n");
	printf("please input:\n");
        if ( read(buttons_fd, current_buttons, sizeof ( current_buttons ) ) != sizeof ( current_buttons) )
        {
            perror("read buttons:");
            exit(1);
        }
	for ( i = 0; i < 6; i++)
	{
	    if ( buttons[i] != current_buttons[i] )
	    {
	         buttons[i] = current_buttons[i];
		 if( buttons[i] == '1')
		 {
		     goto over;
		 }
		 choose = i;
	    }
	}
	if( choose == 7)
	{
	    system("clear");
	    continue;
	}
        switch( choose )
	{
	    case    ran:
	               {
		           system("clear");
		           printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\tyou choose random moudle\n\n\n\n\n\n\n\n\n\n\n\n");
			   flag = 0;
                           sleep(1);
			   break;
		       }
            case   list:
	               {
		           system("clear");
			   printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\tyou chooose list moudle\n\n\n\n\n\n\n\n\n\n\n\n");
			   flag = 0;
			   sleep(1);
			   break;
		       }
            #if 0
            case   ran :
	               {
		           system("clear");
			   printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\tyou chooose random moudle\n\n\n\n\n\n\n\n\n\n\n\n");
			   flag = 0;
			   sleep(1);
			   break;
		       }
             #endif
            case   quit:
	               {
		           system("clear");
			   printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\tsee you!\n\n\n\n\n\n\n\n\n\n\n\n");
			   sleep(1);
			   close( buttons_fd );
			   exit(0);
		       }
            default    :
	               {
		           printf("press key error!\n");
			   sleep(1);
		       }
	}
    over:
	system("clear");
    }
    return choose;
}

 

songdir.c

#include "../include/mp3.h"

dl * dircreate()
{
    DIR *mydir;
    dl *head = NULL;
    dl *last = NULL;
    struct dirent *myitem;
    mydir = opendir("./song/");
    while( ( myitem = readdir(mydir) ) != NULL )
    {
        if( ( strcmp(myitem->d_name,".") == 0 ) || ( strcmp(myitem->d_name,"..") == 0) )
	{
	    continue;
	}
        dl *p = (dl *)malloc(sizeof(dl));
	if( head == NULL)
	{
	    strcpy(p->name,myitem->d_name);
	    head = p;
	    head->front = NULL;
	    head->frev = head;
	    last = p;
	}
	else
	{
	    strcpy(p->name,myitem->d_name);
	    last->frev = p;
	    p->front = last;
	    last = p;
	    last->frev = head;
	}
    }
    head->front = last;
    closedir(mydir);
    return head;
}

void print( dl *head )
{
    dl *p = head;
    printf("mp3 has the song list: ");
    while( p->frev != head )
    {
        printf( "%s ", p->name );
	p = p->frev;
    }
    printf("%s\n",p->name);
}

 

disp.c

 

#include "../include/mp3.h"

void disp( dl *p, char *state, dl *head, int moudle) 
{
    system("clear");
   printf("\n\n\n\t\t******************* MP3 Player *******************\n");
    printf("\n\t\t\tk1 start\t\tk5 stop\n\n");
    printf("\n\t\t\tk3 next \t\tk6 front\n\n");
    printf("\n\t\t\tk2 up   \t\tk4 down \n\n");
    printf("the current state is: %s\n\n",state);
    print(head);
    if( moudle == 1 )
    {
        printf("\nthe current play moudle is: list\n");
    }
    else
    {
        printf("\nthe current play moudle is: random\n");
    }
    printf("\nthe current song is:  %s \n",p->name);
    if( moudle == 1 )
    {
        printf("\nthe next song is:     %s\n",p->frev->name);
    }
    printf("\n\nwait the choose:\n");
}

 

function.c

 

#include"../include/mp3.h"

void function( int buttons_fd, dl *p, char *buttons, int moudle)
{
    char state[5];
    char current_buttons[6];
    int MIX_FD = open("/dev/mixer", O_WRONLY);
    int value = 50;
    int iLevel;
    int iLeft = 0;
    int iRight = 0;
    iLeft = iRight = value;
    iLevel = (iRight << 8) + iLeft;
    ioctl(MIX_FD, MIXER_WRITE(SOUND_MIXER_VOLUME), &iLevel);
    int i = 0;
    int choose = 7;
    strcpy( state,"stop");
    char cmd[30];
    int flag = 0;
    enum fun { start, up, next, down, stop, front };
    pid_t pid = 0;
    dl *head = p;
    int shmid;

    if( (  shmid = shmget( IPC_PRIVATE, sizeof(dl), 0777 ) ) < 0 )
    {
        perror("fail to shmget");
	exit(-1);
    }
    dl *shmaddr;
    shmaddr = (dl *)shmat( shmid,NULL,0);
    memcpy(shmaddr,head,sizeof(dl));
    shmaddr->flag = 0;
    while(1)
    {
        disp( p, state, head, moudle);
	over:
        if ( read(buttons_fd, current_buttons, sizeof ( current_buttons ) )     != sizeof ( current_buttons) )
	{
	    perror("read buttons:");
	    exit(-1);
	}
	if( shmaddr->flag == 1)
        {
	    p = shmaddr;
            shmaddr->flag = 0;
	}
	for ( i = 0; i < 6; i++)
	{
	    if ( buttons[i] != current_buttons[i] )
	    {
	        buttons[i] = current_buttons[i];
	        if( buttons[i] == '1')
	        {
	            goto over;
		}
		choose = i;
	    }
	}
        
	switch( choose )
	{
	    case start:
	              {
		          if( strcmp( state,"stop") == 0)
			  {
                              strcpy( state,"play");
			      if( flag == 1)
			      {
			          system("killall -CONT my_madplay &");
			      }
			      else
			      {
			          flag = 1;
			          pid = fork();
				  if(pid == 0)
				  {
				      while(1)
				      {
				         disp( p,state,head,moudle);
			                 sprintf(cmd,"my_madplay ./song/%s",                                                                   p->name);
			                  system(cmd);
					  sleep(1);
					  if( moudle == 1 )
					  {
					      p = p->frev;
					      p->flag = 1;
					     memcpy( shmaddr, p,sizeof(dl));
					  }
					  else
					  {
					      int n = rand()%3 + 1;
					      while( n-- )
					      {
					          p = p->frev;
					      }
					      p->flag = 1;
					     memcpy( shmaddr, p,sizeof(dl));
					  }
				      }
				  }
			      }
			  }
			  else
			  {
			      printf("the mp3 is already play!\n");
                              sleep(1);
			  }
			  system("clear");
			  break;
		      }
            case  stop:
	              {
		          if( strcmp( state, "stop" ) == 0)
			  {
			      printf("the mp3 current is stop!\n");
			      sleep(1);
			  }
			  else
			  {
			       strcpy( state,"stop");
			       system("killall -STOP my_madplay &");
			  }
			  break;
		      }
	    case front:
	              {
		          int n = rand()%3 + 1;
		          if( strcmp( state,"play") == 0 )
			  {
                              system("killall -9 my_madplay");
			      kill(pid,9);
			      if( moudle == 1)
			      {
			          p = p->front;
			      }
			      else
			      {
				  while(n--)
				  {
				      p = p->front;
				  }
			      }
                              pid = fork();
			      if( pid < 0 )
			      {
			          printf("fork error\n");
			      }
			      if( pid == 0 )
			      {
			          while(1)
				  {
				      disp( p,state,head, moudle);
				      memset( cmd, 0, 30);
                                      sprintf(cmd,"my_madplay ./song/%s ",                                                        p->name);
				      system(cmd);
				      sleep(1);
				      if( moudle == 1 )
				      {
				          p = p->front;
				      }
				      else
				      {
				          int n = rand()%3 + 1;
					  while(n--)
					  {
					      p = p->front;
					  }
				      }
				      p->flag = 1;
                                      memcpy( shmaddr, p, sizeof(dl) );
				  }
			      }
			  }
			  else
			  {
	                      if( flag == 1)
			      {
			          system("killall -9 my_madplay");
			          kill( pid, 9);
			          flag = 0;
			      }
			      if( moudle == 1)
			      {
			          p = p->front;
		              }
			      else
                              {
			          while(n--)
				  {
				      p = p->front;
				  }
			      }
			  }
			  break;
		      }
            case  next:
	              {
		          int n = rand()%3 + 1;
		          if( strcmp( state,"play") == 0)
			  {
			      system("killall -9 my_madplay");
                              kill( pid, 9);
			      if( moudle == 1)
			      {
			          p = p->frev;
			      }
			      else
			      {
			          while(n--)
				  {
				      p = p->frev;
				  }
			      }
			      pid = fork();
                              if( pid < 0 )
			      {
			          printf("press error!\n");
				  exit(-1);
			      }
			      if( pid == 0 )
			      {
			          while(1)
				  {
				      disp( p, state, head, moudle);
				      memset( cmd, 0, 30 );
			              sprintf(cmd,"my_madplay ./song/%s ",                                                    p->name);
				      system(cmd);
				      sleep(1);
				      if( moudle == 1 )
				      {
				          p = p->frev;
				      }
				      else
				      {
				          int n = rand()%3 + 1;
					  while(n--)
					  {
                                              p = p->frev;
					  }
				      }
				      p->flag = 1;
				      memcpy( shmaddr, p, sizeof(dl) );
				  }
			      }
			  }
			  else
			  {
			      if( flag == 1)
			      {
			          system("killall -9 my_madplay");
                                  kill( pid, 9);
				  flag = 0;
			      }
			      if( moudle == 1)
			      {
			          p = p->frev;
			      }
			      else
			      {
			          while(n--)
				  {
				      p = p->frev;
				  }
			      }
			  }
		          break;
		      }
	    case    up:
	              {
		          if( value < 100 )
			  {
			      value = value + 5;
			  }
			  iLeft = iRight = value;
			  iLevel = (iRight << 8) + iLeft;
			  ioctl(MIX_FD, MIXER_WRITE(SOUND_MIXER_VOLUME), 
			                                       &iLevel);
                          printf("voice up done\n");                                                  sleep(1);
		          break;
		      }
            case  down:
	              {
		          if( value > 0)
			  {
			      value = value - 5;
			  }
			  iLeft = iRight = value;
			  iLevel = (iRight << 8) + iLeft;
			  ioctl(MIX_FD, MIXER_WRITE(SOUND_MIXER_VOLUME),                                                                   &iLevel);
			  printf("voice down done\n");
			  sleep(1);
		          break;
		      }
            
            default   :
	              {
		          printf("press error\n");
			  sleep(1);
		      }
        }   
    }
}

main.c

 

#include "../include/mp3.h"

int main()
{
    int module = 0;
    dl *head;
    system("clear");
    int buttons_fd;
    buttons_fd = open("/dev/buttons", 0);
    if ( buttons_fd < 0 )
    {
        perror("open device buttons");
        exit(-1);
    }
    char buttons[6] = { '0', '0', '0', '0', '0', '0' };
    printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\tenjoy music\n\n\n\n\n\n\n\n\n\n\n\n");
    sleep(1);
    system("clear");
    module = module_choose( buttons_fd,buttons );
    head = dircreate();
    function( buttons_fd, head, buttons, module);
    return 0;
}