Cara Mengakses Keypad CVAVR Hello Sahabat Anak Kendali

Sebelumnya saya sudah pernah menuliskan tentang Cara Mengakses Keypad dengan Arduino pada artikel kali ini saya akan mencoba untuk ngakses Keypad dengan menggunakan Mikrokontroller Atmega yang diprogram menggunakan CVAVR cara kerja Keybad juga masih menggunakan Digital Input Output jadi untuk yang belum tau atau belum terlalu mengerti tentang Digital I/O sebaiknya membaca terlebih dahulu Cara mengakses LCD 16x2 CVAVR
sehingga kita dapat memahami tentang I/O digital dan akan mempermudah untuk mengikuti artikel kali ini.

terlebih dahulu silahkan lihat kembali gambar berikut untuk memahami cara kerja KEYPAD 4x4

pada percobaan yang saya lakukan. saya menggunakan PORTB untuk dihubungkan ke KEYPAD nya.
jika menggunakan wiring yang sama dengan yang saya lakukan bisa langsung menuliskan program sebagaimana berikut :

/*****************************************************
This program was produced by the
CodeWizardAVR V2.05.3 Standard
Automatic Program Generator
© Copyright 1998–2011 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project :
Version :
Date : 1/27/2018
Author : Chaerul Anam
Company : Sixty Light
Comments:


Chip type : ATmega32
Program type : Application
AVR Core Clock frequency: 16.000000 MHz
Memory model : Small
External RAM size : 0
Data Stack size : 512
*****************************************************/

#include <mega32.h>

// Alphanumeric LCD functions
#include <alcd.h>

unsigned char keypad();
unsigned char key;
// Declare your global variables here

// untuk menentukan karakter keypad
char keypad()
{
PORTB=0xEF;
if (PINB.3 == 0) return (‘D’);
if (PINB.2 == 0) return (‘7’);
if (PINB.1 == 0) return (‘4’);
if (PINB.0 == 0) return (‘1’);
// — — — — — — — — — — — — — -
PORTB=0xDF;
if (PINB.3 == 0) return (‘*’);
if (PINB.2 == 0) return (‘8’);
if (PINB.1 == 0) return (‘5’);
if (PINB.0 == 0) return (‘2’);
// — — — — — — — — — — — — — -
PORTB=0xBF;
if (PINB.3 == 0) return (‘0’);
if (PINB.2 == 0) return (‘9’);
if (PINB.1 == 0) return (‘6’);
if (PINB.0 == 0) return (‘3’);
// — — — — — — — — — — — — — -
PORTB=0x7F;
if (PINB.3 == 0) return (‘#’);
if (PINB.2 == 0) return (‘C’);
if (PINB.1 == 0) return (‘B’);
if (PINB.0 == 0) return (‘A’);
// — — — — — — — — — — — — — -
}


void main(void)
{
// Declare your local variables here

// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=Out Func2=Out Func1=Out Func0=Out
// State7=T State6=T State5=T State4=T State3=0 State2=0 State1=0 State0=0
PORTA=0x00;
DDRA=0x00;

// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0xBF;
DDRB=0xF0;

// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;

// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x00;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=0xFF
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=0xFFFF
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer2 Stopped
// Mode: Normal top=0xFF
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;

// USART initialization
// USART disabled
UCSRB=0x00;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// ADC initialization
// ADC disabled
ADCSRA=0x00;

// SPI initialization
// SPI disabled
SPCR=0x00;

// TWI initialization
// TWI disabled
TWCR=0x00;

// Alphanumeric LCD initialization
// Connections are specified in the
// Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu:
// RS — PORTC Bit 0
// RD — PORTC Bit 1
// EN — PORTC Bit 2
// D4 — PORTC Bit 4
// D5 — PORTC Bit 5
// D6 — PORTC Bit 6
// D7 — PORTC Bit 7
// Characters/line: 16
lcd_init(16);

while (1)
{
// Place your code here
key = keypad();

if(key == ‘1’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 1”);
}
if(key == ‘2’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 2”);
}
if(key == ‘3’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 3”);
}
if(key == ‘4’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 4”);
}
if(key == ‘5’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 5”);
}
if(key == ‘6’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 6”);
}
if(key == ‘7’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 7”);
}
if(key == ‘8’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 8”);
}
if(key == ‘9’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 9”);
}
if(key == ‘0’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad 0”);
}
if(key == ‘*’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad *”);
}
if(key == ‘#’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad #”);
}
if(key == ‘A’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad A”);
}
if(key == ‘B’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad B”);
}
if(key == ‘C’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad C”);
}
if(key == ‘D’)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf (“Keypad D”);
}
}
}

mungkin cukup sekian artikel kali ini. silahkan beri masukan dan kritikan di komentar !

keyword :
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