key_drv.c

atmel at89c51snd1c mp3芯片方案源码

#include "config.h"                         /* lib configuration header */
#include "key_drv.h"                        /* Keyboard driver definition */
#include "modules\song\song_drv.h" 
#include "lib_mcu\lcd\lcd_drv.h" 
#include "lib_mcu\timer\timer_drv.h"
#include "lib_mcu\ide\ide_drv.h"
#include "modules\mass\usb_task.h" 
#include "modules\file\fat.h" 
#include "lib_mcu\remote\remote_drv.h"



extern  bdata   bit     gl_key_press;       /* TRUE when a key is decoded */
extern   Byte    gl_key;                    /* value of the key pressed */
Byte    key_int;

static  void    kbd_set_prio (Byte);
static  void    kbd_install (void);




///////////////////////////////////////////////////////////////////////////////////
void kbd_init (void)
{
  #if KBD_EXIT_PD
  Kbd_enable_pd_exit();         /* enable keyboard Power-Down exit */
  kbd_set_prio(KBD_PRIO);
  #endif
  Kbd_disable_int(); 
  gl_key_press = FALSE;
//  Kbd_enable_int();
  kbd_install();
}



///////////////////////////////////////////////////////////////////////////////////
void kbd_install (void)
{
//  KBSTA = KBSTA;                  /* dummy read for clearing pending interrupt */
  key_int = 0;
  #if KBD_EXIT_PD
 // Kbd_enable_int();             /* enable or re-enable the kbd interrupt */
  Kbd_unmask_int();
  Kbd_low_int(); 
  #endif
}



///////////////////////////////////////////////////////////////////////////////////
#if KBD_EXIT_PD
void kbd_set_prio (Byte priority)
{
  if ((priority == 1) || (priority == 3))     /* set LSB priority bit */
  {
    IPL1 |=  MSK_EKB;
  }
  if ((priority == 2) || (priority == 3))     /* set MSB priority bit */
  {
    IPH1 |= MSK_EKB;
  }
}
#endif




///////////////////////////////////////////////////////////////////////////////////
Byte kbd_decode(void)
{
    Byte key;
    //key_int = KBSTA;

    switch (key_int & 0x0f)
    {
	  case KEY_0:
	         gl_key_press = TRUE;
	         key = KEY_0;
	         kbd_install();
			 return (key);
      break;

	  case KEY_1:
	         gl_key_press = TRUE;
	         key = KEY_1;
			 kbd_install();
			 return (key);
      break;

	  case KEY_2:
	         gl_key_press = TRUE;
	         key = KEY_2;
			 kbd_install();
			 return (key);
      break;

	  case KEY_3:
		     gl_key_press = TRUE;
	         key = KEY_3;
			 kbd_install();
			 return (key);
      break;

	  default :
		     gl_key_press = FALSE;
		     key = NO_KEY;
		     kbd_install();
			 return(0);
      break;
	}
}

                      
///////////////////////////////////////////////////////////////////////////////////
#if KBD_EXIT_PD
Interrupt(kbd_int (void), IRQ_KBD)
{
//  key_int = KBSTA;
//  Kbd_disable_int();              /* disable interrupt */
  //T0_start();
}
#endif



///////////////////////////////////////////////////////////////////////////////////