djc
Advanced Member level 1
Hello,
I wrote a program for interfacing 4*4 matrix keypad with PIC18f4520 using mikrocPro for pic, which is as follows,
I have declared ROW as output and Column as input. Initial voltage on column pins is 5V so when any key is pressed that column pins gets grounded and has 0V. I am checking the same using
"if(COL0 == 0)" condition, However somehow this condition is always failing. I checked the hardware. It is perfectly fine. But don't know whats the issue with software. It is not checking the given condition for any of the ROW and Column. Can somebody guide me what could be the isue.
Regards
Dheeraj
I wrote a program for interfacing 4*4 matrix keypad with PIC18f4520 using mikrocPro for pic, which is as follows,
Code:
#include <math.h>
#define ROW0 PORTB.B1 //o/p
#define ROW1 PORTB.B3
#define ROW2 PORTB.B5
#define ROW3 PORTB.B7
#define COL0 RB0_bit //i/p
#define COL1 RB2_bit
#define COL2 RB4_bit
#define COL3 RB6_bit
#define Select_DS PORTD.B7
#define Select_Clk PORTD.B6
#define Data_DS PORTD.B5
#define Data_Clk PORTD.B4
#define Test PORTD.B0 //Pin 19
#define TIMER_START_VALUE 250 //230,200,255,500
#define TIMER_START_VALUE_1 250 //210,160,254,255
#define adjust 1000//500,1000
unsigned char i=0,j=0,k=0,m=0,FND_0=0,FND_1=0,FND_2=0,FND_3=0,FND_4=0,FND_5=0,FND_6=0,FND_7=0,FND_8=0,FND_9=0;
bit bulb;
unsigned int num[10] = {39578,65215,6939,23067,32318,23130,6746,65178,6682,23066};
unsigned int alpha[26]= {15898,53779,39898,53907,7002,16218,39514,15934,54227,38867,15854,39934,48812,48316,
39578,16154,39066,15642,23130,63443,39614,45038,44222,60909,63469,52171};
unsigned int num_2[17]= {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
unsigned int Data=0,quotient=0 ;
unsigned char binaryNumber[20];
void Key_Detect(unsigned int Data){
quotient = Data;
i=1;
//j=0;
while(quotient>0){
binaryNumber[i++]= quotient % 2;
quotient = quotient / 2;
}
for(i=i;i<17;i++)
{
binaryNumber[i] = 0;
}
//i--;
//for(j = i-1;j>=0;j--){
while(i!=0){
Data_DS = binaryNumber[i];
Data_Clk = 1;
Delay_us(1);
Data_Clk = 0;
//Delay_us(2);
i--;
};
Data_Clk = 1;
Delay_us(1);
Data_Clk = 0;
//Delay_ms(1000);
//}
}
//void Key_Detect_2(int Data) {
void Key_Detect_2() {
for(i=17;i>0;i--){
Data_DS = num_2[i];
Data_Clk = 1;
Delay_us(1);
Data_Clk = 0;
//Delay_us(2);
//i--;
//Delay_ms(1000);
}
}
void select_fun(){
Select_Clk = 1;
Delay_us(1);
Select_DS = 0;
Select_Clk = 0;
/*Delay_ms(adjust);*/
//Delay_ms(adjust);
}
void disp_clr(){
Select_DS = 1;
Delay_us(1);
for(k=0;k<7;k++){
select_fun();
//Key_Detect(num[0]);
//Delay_ms(400);
}
select_fun();
Key_Detect_2();
Delay_ms(2);
select_fun();
Key_Detect_2();
select_fun();
Key_Detect_2();
select_fun();
Key_Detect_2();
select_fun();
Key_Detect_2();
select_fun();
Key_Detect_2();
select_fun();
Key_Detect_2();
select_fun();
Key_Detect_2();
select_fun();
Key_Detect_2();
select_fun();
Key_Detect_2();
}
void interrupt(){
if(INTCON.TMR0IF){
TMR0L = TIMER_START_VALUE;
TMR0H = TIMER_START_VALUE_1;
TMR0IF_bit = 0;
}
Select_DS = 1;
Delay_us(1);
for(k=0;k<7;k++){
select_fun();
//Key_Detect(num[0]);
//Delay_ms(400);
}
select_fun();
Key_Detect(num[FND_0]);
Delay_ms(2);
select_fun();
Key_Detect(num[FND_1]);
Delay_ms(2);
select_fun();
Key_Detect(num[FND_2]);
Delay_ms(2);
select_fun();
Key_Detect(num[FND_3]);
Delay_ms(2);
select_fun();
Key_Detect(num[4]);
Delay_ms(2);
select_fun();
Key_Detect(num[5]);
Delay_ms(2);
select_fun();
Key_Detect(num[6]);
Delay_ms(2);
select_fun();
Key_Detect(num[7]);
Delay_ms(2);
select_fun();
Key_Detect(num[8]);
Delay_ms(2);
select_fun();
Key_Detect(num[9]);
Delay_ms(2);
//select_fun();
//Key_Detect(alpha[1]);
//disp_clr();
//Test = ~Test;
//TMR0L = TIMER_START_VALUE;
//TMR0H = TIMER_START_VALUE_1;
}
void main() {
TRISD = 0x00; /*//PortD as output*/
PORTD = 0x00; /*//Initial value*/
TRISB = 0x55;
PORTB = 0x00;
INTCON = 0xa0; /*//0xc0;*/
TMR0ON_bit = 0; /*//Stop timer 0 during set up*/
T08BIT_bit = 0; /*// Enable 16 bit timer*/
T0CS_bit = 0; /*// use internal clock to trigger timer to count*/
PSA_bit = 0; /*// Use the prescaler to slow the timer down*/
T0PS0_bit = 0; //1 /*//for 16 bit timer 1/4 of clock freq 001*/
T0PS1_bit = 1; //0
T0PS2_bit = 0; //0
TMR0L = TIMER_START_VALUE;
TMR0H = TIMER_START_VALUE_1;
TMR0ON_bit = 1; //start the timer
while(1){
//Test=1;
disp_clr();
ROW0 = 0;
ROW1 = 1;
ROW2 = 1;
ROW3 = 1;
//Delay_ms(5);
//FND_1=1;
//Test = ~Test;
if(COL0==0){
Delay_ms(1);
FND_1=1;
/*do
{
Delay_ms(1);
FND_1=1;
Test =~Test;
}while(COL0!=1);*/
}
if(COL1==0){
do
{
Delay_ms(1);
FND_2=2;
Test = 0;
}while(COL1!=1);
}
if(COL2==0){
do
{
Delay_ms(1);
FND_3=3;
Test =0;
} while(COL2!=1);
}
/*ROW0 = 1;
ROW1 = 0;
ROW2 = 1;
ROW3 = 1;
Delay_ms(5);
if(COL0==0){
do
{
Delay_ms(1);
}while(COL0!=1);
FND_4=4;
}
if(COL1==0){
do
{
Delay_ms(1);
}while(COL1!=1);
FND_5=5;
}
if(COL2==0){
do
{
Delay_ms(1);
} while(COL2!=1);
FND_6=6;
}
ROW0 = 1;
ROW1 = 1;
ROW2 = 0;
ROW3 = 1;
Delay_ms(5);
if(COL0==0){
do
{
Delay_ms(1);
}while(COL0!=1);
FND_7=7;
}
if(COL1==0){
do
{
Delay_ms(1);
}while(COL1!=1);
FND_8=8;
}
if(COL2==0){
do
{
Delay_ms(1);
} while(COL2!=1);
FND_9=9;
}
ROW0 = 1;
ROW1 = 1;
ROW2 = 1;
ROW3 = 0;
if(COL1==0){
do
{
Delay_ms(1);
}while(COL1!=1);
FND_0=0;
}
if(COL2==0){
do
{
Delay_ms(1);
}while(COL2!=1);
bulb = 1;
}*/
disp_clr();
};
}I have declared ROW as output and Column as input. Initial voltage on column pins is 5V so when any key is pressed that column pins gets grounded and has 0V. I am checking the same using
"if(COL0 == 0)" condition, However somehow this condition is always failing. I checked the hardware. It is perfectly fine. But don't know whats the issue with software. It is not checking the given condition for any of the ROW and Column. Can somebody guide me what could be the isue.
Regards
Dheeraj
