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5. Percobaan pengiriman data ADC

Pengambilan data ADC dan data hasil pembacaan dikirimkan ke Hyperterminal via Port Serial dalam bentuk Desimal: 0000 sd 1024 dan bentuk Tegangan :0.0000 sd 5.00000 volt

#include <mega8535.h>
// Alphanumeric LCD Module functions
#asm
   .equ __lcd_port=0x15 ;PORTC
#endasm
#include <lcd.h>

// Standard Input/Output functions
#include <stdio.h>
#include <delay.h>
#include <stdlib.h>
#define ADC_VREF_TYPE 0xC0
unsigned int data_adc;
unsigned char temp1[6],temp2[6];
float vin;

// Read the AD conversion result
unsigned int read_adc(unsigned char adc_input)
{
ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSRA|=0x40;
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCW;
}

// Declare your global variables here
void main(void)
{
PORTC=0x00;
DDRC=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;

// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: Off
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 2400
UCSRA=0x00;
UCSRB=0x08;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x19;

SFIOR=0x00;

// ADC initialization
// ADC Clock frequency: 500.000 kHz
// ADC Voltage Reference: Int., cap. on AREF
// ADC High Speed Mode: Off
// ADC Auto Trigger Source: Free Running
ADMUX=ADC_VREF_TYPE & 0xff;
ADCSRA=0xA1;
SFIOR&=0x0F;

// LCD module initialization
lcd_init(16);
while (1)
{
// Place your code here
data_adc=read_adc(0);
vin=((float)data_adc*5/1023);
itoa(data_adc,temp1);
printf("Data ADC: %s", temp1);
//
ftoa(vin,10,temp2);//variabel 10=jumlah digit float
printf(" Data Vin: %s",temp2);
putchar(13);
delay_ms(1000);
}
}

6. Pengaturan LED melalui komunikasi serial

Mengendalikan nyala LED secara komunikasi serial, Perintah pengendalian LED menggunakan tombol keyboard di PC.

#include <mega8535.h>
// Standard Input/Output functions
#include <stdio.h>

// Declare your global variables            here
unsigned char data_serial;

void main(void)
{
 PORTC=0x00;
 DDRC=0xFF;

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

// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: Off
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 2400
 UCSRA=0x00;
 UCSRB=0x08;
 UCSRC=0x86;
 UBRRH=0x00;
 UBRRL=0x19;
 SFIOR=0x00;

 while (1)
 {
  // Place your code here
  data_serial=getchar();
  PORTC=a-0x30;//dikurangi 30h mengembalikan ke desimal 
 };
}