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karthickiw
Joined: 09 Aug 2007
Posts: 82
Location: TN, India
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| Problem with Keypad program |
 Posted: Mon Jun 22, 2009 10:35 am |
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Dear CCS friends,
I modified the sample keypad code from ccs forum for my new project. My problem, is when I press any key on keypad I don't get any keylayout data. I only received below result during key press and unpress time on rs232 monitor.
I'm using 18LF452 microcontroller for this project and operating voltage is 3.3 Volt.
Please check my code and give me some idea for solve the problem and please check if fuse is correct for PIC18LF452.
| Code: |
#include <18F452.h>
#device adc=8
#include <stdlib.h>
#include <math.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES XT //High speed Osc (> 4mhz)
#FUSES PROTECT //Code protected from reads
#FUSES NOOSCSEN //Oscillator switching is disabled, main oscillator is source
#FUSES BROWNOUT //Reset when brownout detected
#FUSES BORV20 //Brownout reset at 2.0V
#FUSES PUT //Power Up Timer
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES LVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES WRT //Program Memory Write Protected
#FUSES WRTD //Data EEPROM write protected
#FUSES WRTB //Boot block write protected
#FUSES WRTC //configuration registers write protected
#FUSES CPD //Data EEPROM Code Protected
#FUSES CPB //Boot Block Code Protected
#FUSES EBTR //Memory protected from table reads
#FUSES EBTRB //Boot block protected from table reads
#use delay(clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
//Keypad connection:
#define row0 PIN_B0
#define row1 PIN_B1
#define row2 PIN_B2
#define row3 PIN_B3
#define row4 PIN_B4
#define row5 PIN_B5
#define col0 PIN_A1
#define col1 PIN_A2
#define col2 PIN_A3
#define col3 PIN_A4
#define col4 PIN_A5
//#byte port_b=7
// Keypad layout:
char const KEYS[6][5] =
{{'1','2','3','4','5'}, // 5 4 3 2 1
{'6','7','8','9','0'}, // 0 9 8 7 6
{'A','B','C','D','E'}, // E D C B A
{'F','G','H','I','J'}, // J I H G F
{'K','L','M','N','O'}, // O N M L K
{'P','Q','R','S','T'}}; // T S R Q P
//////////////////////////////////////6 x 5 Key Pad/////////////////////////////
#define KBD_DEBOUNCE_FACTOR 33 // Set this number to apx n/333 where
// n is the number of times you expect
// to call kbd_getc each second
void kbd_init()
{
//set_tris_b(0xFF);
//output_b(0xFF);
port_b_pullups(true);
}
short int ALL_ROWS (void)
{
if(input (row0) & input (row1) & input (row2) & input (row3) & input (row4) & input (row5))
return (0);
else
return (1);
}
char kbd_getc()
{
static byte kbd_call_count;
static short int kbd_down;
static char last_key;
static byte col;
byte kchar;
byte row;
kchar='\0';
if(++kbd_call_count>KBD_DEBOUNCE_FACTOR)
{
switch (col)
{
case 0:
output_low(col0);
output_high(col1);
output_high(col2);
output_high(col3);
output_high(col4);
break;
case 1:
output_high(col0);
output_low(col1);
output_high(col2);
output_high(col3);
output_high(col4);
break;
case 2:
output_high(col0);
output_high(col1);
output_low(col2);
output_high(col3);
output_high(col4);
break;
case 3:
output_high(col0);
output_high(col1);
output_high(col2);
output_low(col3);
output_high(col4);
break;
case 4:
output_high(col0);
output_high(col1);
output_high(col2);
output_high(col3);
output_low(col4);
break;
}
if(kbd_down)
{
if(!ALL_ROWS())
{
kbd_down=false;
kchar=last_key;
last_key='\0';
}
}
else
{
if(ALL_ROWS())
{
if(!input (row0))
row=0;
else if(!input (row1))
row=1;
else if(!input (row2))
row=2;
else if(!input (row3))
row=3;
else if(!input (row4))
row=4;
else if(!input (row5))
row=5;
last_key =KEYS[row][col];
kbd_down = true;
}
else
{
++col;
if(col==5)
col=0;
}
}
kbd_call_count=0;
}
return(kchar);
}
///////////////////////////////////////////////////////////////////////////////
void main()
{
char key;
kbd_init();
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(SPI_SS_DISABLED);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
disable_interrupts(GLOBAL);
//Setup_Oscillator parameter not selected from Intr Oscillotar Config tab
SET_TRIS_C( 0x80 );
SET_TRIS_D( 0x00 );
printf("start...."); //print in rs232
while(True)
{
key=kbd_getc();
printf("key=%c\n\r",key);
}// while
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Jun 22, 2009 11:36 am |
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| Quote: | while(True)
{
key=kbd_getc();
printf("key=%c\n\r",key);
}// while |
This is not the correct way to call the keypad driver. Look at
how CCS does it in this example file. You should do it the same way:
| Quote: | | c:\Program Files\PICC\Examples\Ex_lcdkb.c |
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karthickiw
Joined: 09 Aug 2007
Posts: 82
Location: TN, India
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| Thank you PCM |
| Posted: Mon Jun 22, 2009 9:08 pm |
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Dear PCM,
Thank you for helping us. I try as per example program, it works good. Thank you very Much.
But I don't know why print key variable directly in this program?
My fuse is correct for 18LF452 controller? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Jun 22, 2009 9:51 pm |
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| Quote: | | #FUSES LVP //Low Voltage Programming on B3(PIC16) or B5(PIC18) |
This should be changed to NOLVP.
| Quote: | #FUSES WRT //Program Memory Write Protected
#FUSES WRTD //Data EEPROM write protected
#FUSES WRTB //Boot block write protected
#FUSES WRTC //configuration registers write protected
#FUSES CPD //Data EEPROM Code Protected
#FUSES CPB //Boot Block Code Protected
#FUSES EBTR //Memory protected from table reads
#FUSES EBTRB |
You don't need to protect memory during program development.
Delete these fuses. |
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karthickiw
Joined: 09 Aug 2007
Posts: 82
Location: TN, India
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| thank you |
| Posted: Tue Jun 23, 2009 6:28 am |
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Thank you PCM Programmer  |
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brianm
Joined: 08 Mar 2008
Posts: 17
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| explain the code -- wiring of a keypad |
| Posted: Sun Jun 28, 2009 10:26 pm |
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I am going to use a 4 by 4 keypad and the 16f690 MPU.
Can someone explain what happens when a key is pushed based on the lcdkbd.c example.
The keypad has 8 pin outs and I will hook them to the A and B groups.
Now realizing that some pins don't have pullups I will make them all high via current limiting resistors.
Why is it that pushing a key will do anything when both the mpu pins are still high? Having trouble getting my head around this one.
Thanks so much. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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