Switches debounce and output to LCD in gcc

slacx — Sat, 12 Jan 2008 04:16:10 +0800

Hi all

I'm using this board from Atmel with proc ATMEGA169 and try to program the debouncing switch and output it to LCD but still no luck. I got blank screen on the LCD.

The program is simple:

Switch 1 - increase the number
Switch 2 - decrease the number
Switch 3 - switch 1 digit to the right

The program is like below:

CODE

[FONT=Courier]#include <avr/io.h>
#include <stdbool.h>
#include <avr/interrupt.h>
#include "LCD_Driver.h"
bool sw1_neu = true; //actual switch values
bool sw2_neu = true; //
bool sw3_neu = true; //
bool sw4_neu = true; //
bool sw1_alt = true; //old switch values
bool sw2_alt = true; //
bool sw3_alt = true; //
bool sw4_alt = true;

void anzeigemodul();
void LCD_Init();

unsigned char menuanzeige=0; //variable for the menu display
unsigned char xn = 0; //input-code[xn]
#define CN 10
signed char Eingabecode[CN]={5,1,1,1,1,1,1,1,1,1};

int main(void)
{
LCD_Init();
sei();

DDRC = 0xFF; //PORTC auf Ausgang schalten
PORTC = 0x00; //Alle Pins von PORTC auf null setzen

DDRA = 0xFF; //PORTA auf Ausgang schalten
PORTA = 0x00; //Alle Pins von PORTA auf null setzen

DDRD = 0xFF; //PORTD auf Ausgang schalten
PORTD = 0x00; //Alle Pins von PORTD auf null setzen

DDRG = 0xFF; //PORTG auf Ausgang schalten
PORTG = 0x00; //Alle Pins von PORTG auf null setzen

DDRE = 0x00; //PORTA auf Eingang schalten
PORTE = 0x00; //interne Pull-Up-Widerst�nde von PORTA deaktivieren

//Hauptprogramm (Endlosschleife)
while(1)
{

sw1_neu= PINE & (1<<7); //read PC0
sw2_neu= PINE & (1<<6); //read PC1
sw3_neu= PINE & (1<<5); //read PC2
sw4_neu= PINE & (1<<4); //read PC3

if((sw1_neu==0) && (sw1_alt==1)) //flank at s1 from 1 to 0?
{

Eingabecode[xn]++; //increment numerical value
if (Eingabecode[xn]>9) //bigger than 9?
{
Eingabecode[xn]=0; //set zero
}
anzeigemodul(); //refresh display
}
if((sw2_neu==0) && (sw2_alt==1)) //flank at s2 from 1 to 0?
{
Eingabecode[xn]--; //decrement numerical value
if (Eingabecode[xn]<0) //smaller than 0?
{
Eingabecode[xn]=9; //set zero
}
anzeigemodul(); //refresh display
}
if((sw3_neu==0) && (sw3_alt==1)) //flank at s3 from 1 to 0?
{
xn++; //switch 1 digit to the right
if (xn>(CN-1)) //bigger than CN-1?
{
xn=0; //set zero
}
anzeigemodul(); //refresh display
}

sw1_alt = sw1_neu; //"new data" gets written into "old data"
sw2_alt = sw2_neu;
sw3_alt = sw3_neu;
sw4_alt = sw4_neu;
}

return 0;
}

void anzeigemodul()
{
PORTG &= ~( (1<<PG0) | (1<<PG1) | (1<< PG2) | (1<<PG3) | (1<<PG4));//Intern pullUps lOW
DDRG |= (1<<DDG0) | (1<<DDG1) | (1<<DDG2) | (1<<DDG3) | (1<<DDG4); //PortG as Output (1)

PORTA &= ~( (1<<PA0) |(1<<PA1) |(1<<PA2) |(1<<PA3) |(1<<PA4) | (1<<PA5) | (1<< PA6) | (1<<PA7));//Intern pullUps lOW
DDRA |= (1<<DDA0) | (1<<DDA1) | (1<<DDA2) | (1<<DDA3) | (1<<DDA4) | (1<<DDA5) | (1<<DDA6) | (1<<DDA7);

PORTC &= ~( (1<<PC0) | (1<<PC1) | (1<< PC2) | (1<<PC3) | (1<<PC4) | (1<<PC5) | (1<<PC6) | (1<<PC7));//Intern pullUps lOW
DDRC |= (1<<DDC0) | (1<<DDC1) | (1<<DDC2) | (1<<DDC3) | (1<<DDC4) | (1<<DDC5) | (1<<DDC6) | (1<<DDC7);

PORTD &= ~( (1<<PD0) | (1<<PD1) | (1<< PD2) | (1<<PD3) | (1<<PD4) | (1<<PD5) | (1<<PD6) | (1<<PD7));//Intern pullUps lOW
DDRD |= (1<<DDD0) | (1<<DDD1) | (1<<DDD2) | (1<<DDD3) | (1<<DDD4) | (1<<DDD5) | (1<<DDD6) | (1<<DDD7);

unsigned char j; //local variable for for-loop

for(j=0;j<CN;j++) //writing the code on lcd
{
LCD_puts_f(Eingabecode[j]);
}
if(curser==0)
{
Eingabecode[xn]=curserwert; //return of the buffered value
}
}

The manual of this proc can get it here ATMEL

Anyone can help me??

Interrupt Service Routine

slacx — Sat, 10 Nov 2007 04:59:03 +0800

Hi all,

i want to add one interrupt in my program but i stuck with it using microproc 80535. Currently my program run smoothly with one interrupt timer(with 6 LEDs blinking at specific time). But i want to add one more condition in it so that if i push one button all the lights will go off but just one light will blinking(but still using the same timing with the main program). What interrupt should i choose? and where can I put it?

Thanks for any help.

Lowyat.NET: Latest topics by slacx

Switches debounce and output to LCD in gcc

Interrupt Service Routine