Pengetahuan dasar Pemrograman Led Matrix

Pengetahuan dasar Pemrograman Led Matrix

posted by : limaportal

FEB 11

Scan

Untuk menampilkan karakter ke sebuah segment kita harus menyalakan  led per kolom secara bergantian(scanning) terus menerus.  Karena  frekwensi scanning  cepat  sehingga semua led  terlihat seolah menyala bersamaan.

untuk karakter A maka kode untuk tiap kolom yg akan di scan adalah

kolom ke-1=0x7E , ke-2 : 0x09, ke-3 :0x09, ke-4: 0x7E, & kolom ke-5:0x7E

step/urutan menampilkan huruf A

kirim 0x7E  aktifkan kolom ke-1

kirim 0x09  aktifkan kolom ke-2

kirim 0x09  aktifkan kolom ke-3

kirim 0x7E  aktifkan kolom ke-4

berikut Contoh Program

/*****************************************************
Chip type : ATmega16
Program type : Application
Clock frequency : 11,059200 MHz
*****************************************************/

#include <mega16.h>
#include <delay.h>
// External Interrupt 0 service routine
unsigned short count, column, num, repeat,i;
unsigned char data[4]={‘A’,’B’,’C’,’0′};
void displayLEDmatrix(char huruf);

// Declare your global variables here
unsigned short Alphabets[130]={ 0x7E, 0x09, 0x09, 0x7E, 0xFF, // A
0x7f, 0x49, 0x49, 0x49, 0x36, // B
0x3e, 0x41, 0x41, 0x41, 0x22, // C
0x7f, 0x41, 0x41,0x22, 0x1c,
0x7f, 0x49, 0x49, 0x49, 0x63,
0x7f, 0x09, 0x09, 0x09, 0x01,
0x3e, 0x41, 0x41, 0x49, 0x7a,
0x7f, 0x08, 0x08, 0x08, 0x7f,
0x00, 0x41, 0x7f, 0x41, 0x00, // I
0x20, 0x40, 0x41, 0x3f, 0x01,
0x7f, 0x08, 0x14, 0x22, 0x41,
0x7f, 0x40, 0x40, 0x40, 0x60,
0x7f, 0x02, 0x04, 0x02, 0x7f,
0x7f, 0x04, 0x08, 0x10, 0x7f,
0x3e, 0x41, 0x41, 0x41, 0x3e,
0x7f, 0x09, 0x09, 0x09, 0x06,
0x3e, 0x41, 0x51, 0x21, 0x5e,
0x7f, 0x09, 0x19, 0x29, 0x46,
0x46, 0x49, 0x49, 0x49, 0x31, // S
0x01, 0x01, 0x7f, 0x01, 0x01,
0x3f, 0x40, 0x40, 0x40, 0x3f,
0x1f, 0x20, 0x40, 0x20, 0x1f,
0x3f, 0x40, 0x30, 0x40, 0x3f,
0x63, 0x14, 0x08, 0x14, 0x63,
0x07, 0x08, 0x70, 0x08, 0x07,
0x61, 0x51, 0x49, 0x45, 0x43 // Z
};

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

// Input/Output Ports initialization
// Port A initialization
// Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out
// State7=0 State6=1 State5=1 State4=1 State3=1 State2=1 State1=1 State0=1
PORTA=0x7F;
DDRA=0xFF;

// Port B initialization
// Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out
// State7=0 State6=0 State5=0 State4=0 State3=1 State2=1 State1=1 State0=1
PORTB=0x0F;
DDRB=0xFF;

// 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=P State2=P State1=P State0=P
PORTD=0x0F;
DDRD=0x00;
// Global enable interrupts
#asm(“sei”)

while (1){
// huruf A mulai index array 0-5
//huruf B mulai index array 6-11
//dst

for(i=0;i<5;i++ )
{

displayLEDmatrix(data[i]);

}

};
}
void displayLEDmatrix(char huruf)
{
//=====================
num=huruf-65;
// Display 26 alphabets

for (repeat=0; repeat<100; repeat++)
{
column = 1;
for(count = num*5;count < (num*5+6);count++) //num=0,5,10,15,dst…
{
PORTB = ~Alphabets[count];
PORTA = column;
delay_ms(5);
column = column<<1;
}
}
delay_ms(10);

//=====================
}