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Help me for Scankey 3*4

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nguyenchituyen2801

Joined: 23 Nov 2007
Posts: 2

Help me for Scankey 3*4

Posted: Wed Jul 22, 2009 3:55 am

I have problem about scankey.
Sometimes I don't receiving key right, I adjust time delay I will result orther, why...?
I use "printf("%x",scan_code);"" for see var scan_code, I see it right from 1 to 9, but F1, F2, F3, up, down, F5, Clear is wrong.
My keypad:

Code:

________________________________
|7(F1) |8(up) |9(F2) |
|4(left) |5(F3) |6(right) |
|1(F4) |2(down) |3(F5) |
|shift |0 |enter(clear)|
|________________________________|

Help me soon.
thank, best regards

Code:

#include <C:\Program Files\PICC\Devices\16F876A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#FUSES PROTECT //Code protected from reads
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)

#byte INTCON = 0x0B
#bit Port_B_Enable = 0x0B.0

int8 scan_code=0;
int8 luu_scan_code=0;
int8 key_code=0;
int8 my_add=0;

//###############################################
int8 Scan_KeyPress()
{
scan_code=0xFF;
//look row
SET_TRIS_B( 0b00000111 );
Port_B_Enable = 0;
delay_cycles(25);
if(!input(PIN_B1)) bit_clear(scan_code, 0);
if(!input(PIN_B2)) bit_clear(scan_code, 1);
if(!input(PIN_B3)) bit_clear(scan_code, 2);
delay_cycles(25);
//look col
SET_TRIS_B( 0b1111000 );
Port_B_Enable = 1;
delay_cycles(25);
if(!input(PIN_B3)) bit_clear(scan_code, 3);
if(!input(PIN_B4)) bit_clear(scan_code, 4);
if(!input(PIN_B5)) bit_clear(scan_code, 5);
if(!input(PIN_B6)) bit_clear(scan_code, 6);
switch(scan_code)
{
case 0xbe:return 0;
case 0xf3:return 1;
case 0xf2:return 2;
case 0xf1:return 3;
case 0xef:return 4;
case 0xee:return 5;
case 0xed:return 6;
case 0xdf:return 7;
case 0xde:return 8;
case 0xdd:return 9;
}//switch
}//VOID

void main ( )
{
int8 Key_press;
Port_B_Pullups(True);
SET_TRIS_B( 0b11100000 );
INTCON=0X08;
while( true )
{
luu_scan_code=scan_code;
Key_press =Scan_KeyPress();
if(luu_scan_code!=scan_code && scan_code!=0xFF)
{
//printf("%x",scan_code);
//putc(scan_code);
//putc(key_code);
printf("%x",Key_press);
delay_ms(400);
key_code=0;
}//if
}//while
} //main

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Wed Jul 22, 2009 12:05 pm

Post a link to the data sheet for your keypad.

nguyenchituyen2801

Joined: 23 Nov 2007
Posts: 2

keypad

Posted: Wed Jul 22, 2009 6:50 pm

My keypad:
http://www.mediafire.com/?sharekey=fe2303cfc7208b8a0dec85adfe0a530ae04e75f6e8ebb871

I am successful with code RF:

Code:

#include <C:\Program Files\PICC\Devices\16F876A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#FUSES PROTECT //Code protected from reads
#use delay(clock=20000000)
#byte portb = 0x06
#byte portc = 0x07
#byte INTCON = 0x0B
#define out_bit PIN_A0 //chan2
#define DK PIN_A1 //chan3

int16 dem_de_sleep=0;
int8 scan_code=0;
int8 luu_scan_code=0;
int8 key_code=0;
int8 my_add=0;
//int8 temp_portC=0;

//##########################################
void quet_phim()
{
scan_code=0xFF;
//tim hang
SET_TRIS_B( 0b00011111 );
delay_cycles(2);
if(!input(PIN_B0)) bit_clear(scan_code, 0);
if(!input(PIN_B1)) bit_clear(scan_code, 1);
if(!input(PIN_B2)) bit_clear(scan_code, 2);
if(!input(PIN_B4)) bit_clear(scan_code, 4);
delay_cycles(2);
SET_TRIS_B( 0b11100000 );
delay_cycles(2);
if(!input(PIN_B5)) bit_clear(scan_code, 5);
if(!input(PIN_B6)) bit_clear(scan_code, 6);
if(!input(PIN_B7)) bit_clear(scan_code, 7);
bit_clear(INTCON, 0);
bit_clear(INTCON, 0);
bit_clear(INTCON, 0);
switch(scan_code)
{
case 190:key_code=0;break;
case 125:key_code=1;break;
case 189:key_code=2;break;
case 221:key_code=3;break;
case 123:key_code=4;break;
case 187:key_code=5;break;
case 219:key_code=6;break;
case 111:key_code=7;break;
case 175:key_code=8;break;
case 207:key_code=9;break;

case 94 :key_code=10;break;
case 222:key_code=11;break;
case 60 :key_code=12;break;
case 122:key_code=13;break;
case 90 :key_code=14;break;
case 46 :key_code=15;break;
case 126:key_code=16;break;

case 110:key_code=17;break;
case 78: key_code=18;break;
case 58: key_code=19;break;
case 124:key_code=20;break;
case 92: key_code=21;break;
case 108:key_code=22;break;
case 76: key_code=23;break;
default:break;
}
}
//##########################################
void xuat_xung_dong_bo()
{
Output_low (out_bit);Delay_us (1500 );
output_high(out_bit);Delay_us (1500 );
}
//##########################################
void xuat_mot_byte(int8 data_out)
{
int8 dem;
xuat_xung_dong_bo();
for(dem=0;dem<8;dem++)
{
if( bit_test(data_out,dem))
{
Output_low (out_bit);Delay_us (1000 );
output_high(out_bit);Delay_us (1000 );
}
else
{
Output_low (out_bit);Delay_us (500 );
output_high(out_bit);Delay_us (500 );
}
}
}
//##########################################
void main ( )
{
portb=0;
// portC=0xFF;
Port_B_Pullups(True);
SET_TRIS_B( 0b11100000 );
set_tris_C ( 0b11111111 ) ;
// set_tris_C ( 0 ) ;
/* Output_float(PIN_C0);
Output_float(PIN_C1);
Output_float(PIN_C2);
Output_float(PIN_C3);
Output_float(PIN_C4);
Output_float(PIN_C5);
Output_float(PIN_C6);
Output_float(PIN_C7);*/
INTCON=0X08;
while( true )
{
/* if(input(PIN_C0))my_add=1;
else my_add=2;
*/
my_add=0;
if (!input(pin_C0)) BIT_SET(my_add,0);
if (!input(pin_C1)) BIT_SET(my_add,1);
if (!input(pin_C2)) BIT_SET(my_add,2);
if (!input(pin_C3)) BIT_SET(my_add,3);
if (!input(pin_C4)) BIT_SET(my_add,4);
my_add++;

luu_scan_code=scan_code;
quet_phim();
xuat_mot_byte(0xFF);
if(luu_scan_code!=scan_code && scan_code!=0xFF)
{
dem_de_sleep=0;
output_high(DK);
/* key_code =0;
if(input(PIN_C0)) bit_set(key_code,0);
if(input(PIN_C1)) bit_set(key_code,1);
if(input(PIN_C2)) bit_set(key_code,2);
if(input(PIN_C3)) bit_set(key_code,3);
if(input(PIN_C4)) bit_set(key_code,4);
if(input(PIN_C5)) bit_set(key_code,5);
xuat_mot_byte(my_add);
xuat_mot_byte(my_add);
xuat_mot_byte(my_add);
xuat_mot_byte(my_add);*/
//xuat_mot_byte(0xFF);
//xuat_mot_byte(0xFF);
xuat_mot_byte(0xFF);
xuat_mot_byte(0xFF);

key_code++;
xuat_mot_byte(my_add);//0
xuat_mot_byte(key_code);//1
xuat_mot_byte(255-key_code);//2
xuat_mot_byte(key_code);//3
xuat_mot_byte(255-key_code);//4
xuat_mot_byte(key_code);//5
xuat_mot_byte(255-key_code);//6
xuat_mot_byte(key_code);//7
/*xuat_mot_byte(255-key_code);//8
xuat_mot_byte(key_code);//9
xuat_mot_byte(255-key_code);//10*/

}
dem_de_sleep++;
//output_toggle(out_bit);
//delay_ms(10);
if(dem_de_sleep>=150)
{
output_low(DK);
sleep();
bit_clear(INTCON, 0);
bit_clear(INTCON, 0);
bit_clear(INTCON, 0);
dem_de_sleep=0;
}//if
}//while
} //main

but I am not successful with code RS232, help me!

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Wed Jul 22, 2009 7:15 pm

Quote:

I have problem about scankey. Sometimes I don't receiving key right.

Your keypad is a normal 4x3 keypad with 3 column pins and 4 row pins.
Try using the Flex keypad driver in the Code Library forum:
http://www.ccsinfo.com/forum/viewtopic.php?t=26333

Make sure you put pull-up resistors on the Row pins. You can turn on
the Port B pull-ups to do this.

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