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Push-Button Interrupt

 
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Baesy



Joined: 06 Nov 2009
Posts: 4

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Push-Button Interrupt
PostPosted: Thu Mar 25, 2010 6:16 am     Reply with quote
Hello

I work with the PIC16F883 and I have a problem. By the inputs RB5 and RB6 I have two pushbuttons with pull-down resistors. Now I want to have two interrupt routines, one for the input RB5 and one for the input RB6. I wrote the following code, but it doesn't work.
Code:

#fuses HS, NODEBUG, NOBROWNOUT, NOPROTECT, MCLR, NOPUT, NOFCMEN, WDT
#fuses NOLVP, NOWRT, NOIESO, NOCPD,

#use delay (clock=8000000)

//Funktions-Prototypen
void InitPorts (void);
void InitTimer0 (void);
void InitTasterInt (void);
void InitADC (void);
void ReadADC (void);

//Globale Variabeln
unsigned char Lautsprecher = 0;
                     

void main (void)
{
    
  InitPorts();
  InitTasterInt();


  while(1)
  {
 
  }//while(1) 
}


/****************************************************/
/* InitPorts
/****************************************************/
void InitPorts (void)
{
  SET_TRIS_A(0x2F); //Eingänge und Ausgänge definieren
  SET_TRIS_B(0x00);
  SET_TRIS_C(0xCF);
}


/****************************************************/
/* Interrupt vom RB5: Einlese-Taster
/****************************************************/
#INT_RB5
void InterruptTasterRB5 (void)
{
   while(1);
}

/***************************************************/
/* Interrupt vom RB6: Taster Neue Kiste
/***************************************************/
#INT_RB6
void InterruptTasterRB6 (void)
{
   while(1);
}


/*****************************************************/
/* InitTasterInt
/*****************************************************/
void InitTasterInt (void)
{
  ENABLE_INTERRUPTS(GLOBAL); 
  ENABLE_INTERRUPTS(INT_RB5);
  ENABLE_INTERRUPTS(INT_RB6);
}

Could somebody help me please.

PS: Sry for my english, I'm a young swiss student. :-D
turantus



Joined: 25 Mar 2010
Posts: 4

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PostPosted: Thu Mar 25, 2010 11:41 am     Reply with quote
Maybe the watchdog resetting you all time?
mbge5amw



Joined: 13 Dec 2004
Posts: 15
Location: Yorkshire, UK

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PostPosted: Mon Mar 29, 2010 8:44 am     Reply with quote
Quote:
SET_TRIS_B(0x00);


TRIS needs to be set high on a pin for it to be read as an input.

I am also not sure if the way you have the switch wired would work,it may eb worth checking the voltage on the input pin.
Not sure if you can drive a low input with a weak pull down resistor, I've always been taught that TTL circuits should have a weak pull up and a strong pull down. i.e. your push button goes to ground and your resistor (1k to 10k would be fine) goes to VCC.

Andy
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