keyboard.c

来自「ucos源码」· C语言 代码 · 共 181 行

/*********************************************************************************************
* File：	keyboard.c
* Author:	embest
* Desc：	keyboard source code
* History:	
*********************************************************************************************/

/*--- include files ---*/

#include "44b.h"
#include "44blib.h"
#include "includes.h"
#include "keyboard.h"


/*--- global variables ---*/

/* keyboard control address */

//#define	keyboard_base (*(volatile unsigned char *)(0x06000000))
volatile unsigned char *keyboard_base = (unsigned char *) 0x06000000;
/*--- function declare ---*/

void init_keyboard();

void KeyboardInt(void);

//void Eint4567Isr(void);

/*--- function code ---*/
/*********************************************************************************************
* name:		init_keyboard
* func:		init keyboard interrupt
* para:		none
* ret:		none
* modify:
* comment:		
********************************************************************************************/
void init_keyboard()
{
	/* enable interrupt */
	rINTMOD = 0x0;
	rINTCON = 0x1;
		
	/* set EINT1 interrupt handler */
	rINTMSK =~(BIT_GLOBAL|BIT_EINT1);
    pISR_EINT1 = (int)KeyboardInt;
  //  pISR_EINT4567 = (int)Eint4567Isr;
    
    /* PORT G */
    rPCONG  = 0xffff;					// EINT7~0
	rPUPG   = 0x0;						// pull up enable	    
	rEXTINT = rEXTINT|0x20;				// EINT1 falling edge mode
	
	rI_ISPC = BIT_EINT1;	// clear pending bit
	rEXTINTPND = 0xf;					// clear EXTINTPND reg
}
/*********************************************************************************************
* name:		Test_Keyboard
* func:		test keyboard
* para:		none
* ret:		none
* modify:
* comment:		
********************************************************************************************/
void Test_Keyboard()
{
	// init keyboard
	init_keyboard();
	Uart_Printf("\nPlease press one key on keyboard and look at LED ...");
	Uart_Printf("\nplease watch growth the qihuanyun self......:");
	// close keyboard
	// close_keyboard();
}




/*********************************************************************************************
* name:		KeyboardInt
* func:		keyboard interrupt handler function
* para:		none
* ret:		none
* modify:
* comment:		
********************************************************************************************/
void KeyboardInt(void)
{
	int value;
	rI_ISPC = BIT_EINT1;			// clear pending bit
	rEXTINTPND = 0xf;				// clear EXTINTPND reg
	
	value = key_read();
	if(value > -1)
		Digit_Led_Symbol(value);
		
	rI_ISPC = BIT_EINT1;			// clear pending bit
	rINTCON = 0x1;
}

/*********************************************************************************************
* name:		key_read
* func:		read key value
* para:		none
* ret:		key value, -1 -- error
* modify:
* comment:		
********************************************************************************************/
inline int key_read()
{
	int value;
	char temp;
	
	/* read line 1 */
	temp = *(&keyboard_base+0xfd);
	/* not 0xF mean key down */
	if(( temp & KEY_VALUE_MASK) != KEY_VALUE_MASK)
	{
		if( (temp&0x1) == 0 )
			value = 3;
		else if( (temp&0x2) == 0 )
			value = 2;
		else if( (temp&0x4) == 0 )
			value = 1;
		else if( (temp&0x8) == 0 )
			value = 0;
		return value;
	}
	
	/* read line 2 */
	temp = *(&keyboard_base+0xfb);
	/* not 0xF mean key down */
	if(( temp & KEY_VALUE_MASK) != KEY_VALUE_MASK)
	{
		if( (temp&0x1) == 0 )
			value = 7;
		else if( (temp&0x2) == 0 )
			value = 6;
		else if( (temp&0x4) == 0 )
			value = 5;
		else if( (temp&0x8) == 0 )
			value = 4;
		return value;
	}
	
	/* read line 3 */
	temp = *(&keyboard_base+0xf7);
	/* not 0xF mean key down */
	if(( temp & KEY_VALUE_MASK) != KEY_VALUE_MASK)
	{
		if( (temp&0x1) == 0 )
			value = 0xb;
		else if( (temp&0x2) == 0 )
			value = 0xa;
		else if( (temp&0x4) == 0 )
			value = 9;
		else if( (temp&0x8) == 0 )
			value = 8;
		return value;
	}
	
	/* read line 4 */
	temp = *(&keyboard_base+0xef);
	/* not 0xF mean key down */
	if(( temp & KEY_VALUE_MASK) != KEY_VALUE_MASK)
	{
		if( (temp&0x1) == 0 )
			value = 0xf;
		else if( (temp&0x2) == 0 )
			value = 0xe;
		else if( (temp&0x4) == 0 )
			value = 0xd;
		else if( (temp&0x8) == 0 )
			value = 0xc;
		return value;
	}
	
	return -1;
}