Digital touch Screen Combination lock

[astanapane]

Richard, thanks once again.

The final version will be under a 12V power supply. So there is no problem thinking about power consumption.

Physically the final version might have resistors to unused pins pulled to +5V.

At the moment i'm testing the circuit on breadboard for 3 days and there is no problem at all.

P.S.

/Henrik.

EDIT: One more thing: You're clearly reading PORTB which must mean you're using those five low bits as inputs, yet, at the top of the program you have TRISB = %00000000 which makes all of PORTB outputs...

So if you use for example the "if"

if LATB.0 = 0

that mean that we make the port as input? If that so, then what is the way to read the status of the port...."high" or "low" or even the value of the port?

In the mean time im reading the manual.

[richard]

So if you use for example the "if"

if LATB.0 = 0
that mean that we make the port as input? If that so, then what is the way to read the status of the port...."high" or "low" or even the value of the port?

combined with this continually showing up in your code


TRISA = %00000000 'use TRISA to specify which pin is (1 = input) and which (0 = output) (ALL pins are output)
TRISB = %00000000 'use TRISB to specify which pin is (1 = input) and which (0 = output) (RB7 PORTB.7 is the RX input pin of the EUART, the rest are output)
TRISC = %10000000 'use TRISC to specify which pin is (1 = input) and which (0 = output) (RC7 PORTC.7 is the RX input pin of the EUART, the rest are output)
'in PORTC the RC3 attached is an LED.

'------------------------------------------------------------------------|
'--------------------------- TRIS A B C ---------------------------------|
'------------------------------------------------------------------------|
' PORTA.7  PORTA.6  PORTA.5  PORTA.4  PORTA.3  PORTA.2  PORTA.1  PORTA.0 |
'  bit7     bit6     bit5     bit4     bit3     bit2     bit1     bit0   |
'   0        0        0        0        0        0        0        0     |
'------------------------------------------------------------------------|
'------------------------------------------------------------------------|
' PORTB.7  PORTB.6  PORTB.5  PORTB.4  PORTB.3  PORTB.2  PORTB.1  PORTB.0 |
'  bit7     bit6     bit5     bit4     bit3     bit2     bit1     bit0   |
'   0        0        0        0        0        0        0        0     |
'------------------------------------------------------------------------|
'------------------------------------------------------------------------|
' PORTC.7  PORTC.6  PORTC.5  PORTC.4  PORTC.3  PORTC.2  PORTC.1  PORTC.0 |
'  bit7     bit6     bit5     bit4     bit3     bit2     bit1     bit0   |
'   1        0        0        0        0        0        0        0     |

leads me to think there is fundamental lack of understanding here of pic i/o architecture
and the relation ship between ansel,port,lat and tris registers and their effect on
pin operations.

i would recommend a few led flashing exercises to become comfortable with i/o concepts

[astanapane]

Hi Richard,

i will try some LED blinks for sure.

many thanks.

[richard]

contrary to popular belief its a tricky subject

lesson 1 what happens here with and without the nop compiled in ? and why ?

;rmw test ,a led with a  270 ohm resistor in series to gnd placed each on pin a0 and a1
#CONFIG
  CONFIG  FOSC = INTIO67
  CONFIG  PLLCFG = OFF
  CONFIG  PRICLKEN = ON
  CONFIG  FCMEN = OFF
  CONFIG  IESO = OFF
  CONFIG  PWRTEN = ON
  CONFIG  BOREN = SBORDIS
  CONFIG  BORV = 190
  CONFIG  WDTEN = ON
  CONFIG  WDTPS = 32768
  CONFIG  CCP2MX = PORTC1
  CONFIG  PBADEN = OFF
  CONFIG  CCP3MX = PORTB5                                
  CONFIG  T3CMX = PORTC0
  CONFIG  HFOFST = ON
  CONFIG  P2BMX = PORTB5
  CONFIG  MCLRE = EXTMCLR
  CONFIG  STVREN = ON
  CONFIG  LVP = OFF
  CONFIG  XINST = OFF
  CONFIG  DEBUG = OFF
  CONFIG  CP0 = OFF
  CONFIG  CP1 = OFF
  CONFIG  CP2 = OFF
  CONFIG  CP3 = OFF
  CONFIG  CPB = OFF
  CONFIG  CPD = OFF
  CONFIG  WRT0 = OFF
  CONFIG  WRT1 = OFF
  CONFIG  WRT2 = OFF
  CONFIG  WRT3 = OFF
  CONFIG  WRTC = OFF
  CONFIG  WRTB = OFF
  CONFIG  WRTD = OFF
  CONFIG  EBTR0 = OFF
  CONFIG  EBTR1 = OFF
  CONFIG  EBTR2 = OFF
  CONFIG  EBTR3 = OFF
  CONFIG  EBTRB = OFF
#ENDCONFIG
'    DEFINE DEBUG_REG PORTB
'    DEFINE DEBUG_BIT 7      ;  if not used for pwr  
'    DEFINE DEBUG_BAUD 9600
'    DEFINE DEBUG_MODE 0  
'  ASM




    ANSELA = 0
    DEFINE OSC 64 
    OSCCON = $70
    OSCTUNE.6 = 1
    TRISA = %11111100 
led1 var lata.0
led2 var lata.1


loopy:
lata=0
led2 = !porta.1
;@ nop
led1 = porta.1


pause 3000
 
goto loopy