Matrix Keypad routine

[mpardinho]

keypad complied 100%,
but in terminal i receive many keys without press any key

my test:

Include "modedefs.bas"
INCLUDE "KeyPad.bas"  

DEFINE KEYPAD_ROW        4        ' 4 ROW keypad       
DEFINE KEYPAD_ROW_PORT   PORTB    ' ROW port = PORTB
DEFINE KEYPAD_ROW_BIT    4        ' ROW0 = PORTB.4
DEFINE KEYPAD_COL        3        ' 3 COL keypad
DEFINE KEYPAD_COL_PORT   PORTB    ' COL port = PORTB
DEFINE KEYPAD_COL_BIT    1        ' COL0 = PORTB.1
DEFINE KEYPAD_DEBOUNCEMS 200      ' debounce delay = 200 mSec
DEFINE KEYPAD_AUTOREPEAT 0        ' use auto-repeat feature 

Serial_Saida       Var     PORTC.2           'Pic 13  - >  Max232   10       
myvar                    var byte

Inicio:
    @ READKEYPAD _myvar
    Serout Serial_Saida, T2400, [#myvar, 13, 10] 
goto Inicio

Terrminal:

Received: 15
Received: 15
Received: 1
Received: 3
Received: 15
Received: 15
Received: 3
Received: 2
Received: 3
...... withou press any key

[mister_e]

seems you forgot to add external pull-ups....

i don't know wich pic you are using but try

OPTION_REG.7=0

[mpardinho]

i use 16f628a with pull-ups ..... for test

in circuit row and col have voltage around 0,5 to 3,5v (oscillating ... i don't know why)

than i press one button, 2 pins have 0,0v

[Ioannis]

Hi. While testing Steve's routine, I get many fatal errors. The attached Screen Capture gives the state. Steve if you can have a look...

Includes are OK about names and paths.

Ioannis

[mister_e]

Ioannis,
You have to compile with MPASM, not PM.

mpardinho,
You probably miswired something. with your exact program it works fine here. Also.. there's no PORTC on PIC16F628 but you should already know that.

i used this line for my config fuses

@   __CONFIG  _INTRC_OSC_NOCLKOUT & _MCLRE_OFF  &  _LVP_OFF & _WDT_OFF & _PWRTE_ON  & _BODEN_ON

Did you tried with OPTION_REG.7=0 without resistor?

wich value of pull-up?

[Ioannis]

Ioannis,
You have to compile with MPASM, not PM.

Ohh! dear....

Thanks,
Ioannis

[charudatt]

Hello Steve,

Any idea in getting your code to work (compile) with PM. ?

That would be a big help.

thank you for the shareing the code.

regards