Keypad and DT's Instant Interrupts

[mister_e]

using the previous but changing KEYPAD_ROW or KEYPAD_COL number it always work for me. Yeah, even a 1X1 keypad work... wooohoo how handy it is

Now, using a TIMER0 interrupt and DT-INT14, it looks like

<font color="#000000">    @       __CONFIG _XT_OSC &amp; _LVP_OFF
    
    <font color="#000080">INCLUDE </font>&quot;C:\PBP_PROG\INCLUDE_ROUTINES\KeyPad.bas&quot;
    <font color="#000080">INCLUDE </font>&quot;c:\PBP_PROG\EASYPIC4\LCD4.bas&quot;  
    <font color="#000080">INCLUDE </font>&quot;C:\PBP_PROG\INCLUDE_ROUTINES\DT_INTS-14.bas&quot;
    <font color="#000080">INCLUDE </font>&quot;C:\PBP_PROG\INCLUDE_ROUTINES\ReEnterPBP.bas&quot;            
    
    <font color="#000080">DEFINE </font>KEYPAD_ROW 4 	 <font color="#008000">' 4 ROW keypad
    </font><font color="#000080">DEFINE </font>KEYPAD_ROW_PORT PORTB <font color="#008000">' ROW port = PORTB
    </font><font color="#000080">DEFINE </font>KEYPAD_ROW_BIT 4 	 <font color="#008000">' ROW0 = PORTB.4
    </font><font color="#000080">DEFINE </font>KEYPAD_COL 3 	 <font color="#008000">' 4 COL keypad
    </font><font color="#000080">DEFINE </font>KEYPAD_COL_PORT PORTB <font color="#008000">' COL port = PORTB
    </font><font color="#000080">DEFINE </font>KEYPAD_COL_BIT 1 	 <font color="#008000">' COL0 = PORTB.0
    </font><font color="#000080">DEFINE </font>KEYPAD_DEBOUNCEMS 20  <font color="#008000">' debounce delay = 20 50 mSec
    </font><font color="#000080">DEFINE </font>SCAN_ONCE 1
    
    
<font color="#000080">ASM
INT_LIST  macro    
        INT_Handler   TMR0_INT,  _TMR0Interrupt,   PBP,  yes
    endm
    INT_CREATE               
ENDASM
    
    </font>OPTION_REG=%00000100    	 <font color="#008000">' Enable weak-pull ups
</font>                            	 <font color="#008000">' Prescaler assigned to Timer0
</font>                            	 <font color="#008000">' rate 1:32

    </font>ByteA <font color="#000080">VAR BYTE
    </font>TMR0IF <font color="#000080">VAR </font>INTCON.2
    
    <font color="#000080">PAUSE </font>500
    <font color="#000080">LCDOUT </font>$FE,1,&quot;PRESS ANY KEY&quot;

    @ INT_ENABLE  TMR0_INT

Start:
    <font color="#000080">IF </font>ByteA <font color="#000080">THEN 
        LCDOUT </font>$FE,$C0,<font color="#000080">REP </font>&quot; &quot;\2,$FE,$C0, <font color="#000080">DEC </font>ByteA
        <font color="#000080">ENDIF
    GOTO </font>Start
    

TMR0Interrupt:
    @ READKEYPAD _ByteA
    TMR0=0
    @ INT_RETURN

and it's still working.

do a I/O test with LEDs and push button to see if there's any faulty.

KEYPAD_COL 3 really set the KeyPAd to 3 column, DEFINE KEYPAD_COL_BIT 1 will imply you're connected to PORTB.1, PORTB.2, PORTB.3

same for rows, DEFINE KEYPAD_ROW 4, 4 rows, DEFINE KEYPAD_ROW_BIT 4, so PORTB.4, PORTB.5, PORTB.6 and PORTB.7.