Contoh Code untuk Komunikasi Serial (Rs232) Atmega8535

#include <mega8535.h>

#include <delay.h>

#include <stdio.h>

#include <lcd.h>

#include <string.h>

char rx_buffer[16];

unsigned char ir,ada_data;

void cek_perintah();

char *cmds[] = {“ON0”, “ON1”, “ON2″,”ON3″}; //artinya cmds[0]=”0N0″, cmds[1]=”ON1” dst…

#define ON0 0

#define ON1 1

#define ON2 2

#define ON3 3

// Alphanumeric LCD Module functions
#asm
   .equ __lcd_port=0x15 ;PORTC
#endasm

// USART Receiver interrupt service routine

interrupt [USART_RXC] void usart_rx_isr(void)

{

char r_char;

r_char=UDR;

rx_buffer[ir] = r_char;

if (ir++ == 8 .) //

{

rx_buffer[ir]=0x00;

ir=0;

}

cek_perintah();

ada_data=1; //indikator status aza

}

//========================int usart============================================

// Declare your global variables here

void main(void){

// USART initialization

// Communication Parameters: 8 Data, 1 Stop, No Parity

// USART Receiver: On

// USART Transmitter: On

// USART Mode: Asynchronous

// USART Baud rate: 9600

UCSRA=0x00;

UCSRB=0x98;

UCSRC=0x86;

UBRRH=0x00;

UBRRL=0x4D;

// LCD module initializationlcd_init(16);

lcd_gotoxy(0,0);

lcd_putsf(“komunikasi”);

// Global enable interrupts

#asm(“sei”)

while (1)

{

ir=0;

//======================================

if (ada_data == 1) cek_perintah();

//===========================================

//tampilkan data yg diterima di LCD

lcd_gotoxy(0,0);

lcd_puts(rx_buffer);

}

}  //ralat tambahan.

void cek_perintah() {

int i; char cmd; char cmdStr[50];

strcpy(cmdStr, rx_buffer);

// BANDINGKAN perintah yg diterima (cmdstr) dengan array cmds[]

cmd = -1;

for (i = 0; i < 4; i++)

{ if (!strcmp(cmdStr, cmds[i]))

{ cmd = i;

break;

}

}

switch(cmd) {

case ON0:

lcd_gotoxy(0,1);

lcd_putsf(“LAMPU 0 ON”);

delay_ms(10);

break;

case ON1:

lcd_gotoxy(0,1);

lcd_putsf(“LAMPU 1 ON”);

delay_ms(10);

break;

case ON2:

lcd_gotoxy(0,1);

lcd_putsf(“LAMPU 2 ON”);

delay_ms(10);

break;

case ON3:

lcd_gotoxy(0,1);

lcd_putsf(“LAMPU 3 ON”);

delay_ms(10);

break;

}

ada_data=0;

}