mammadkhata
Newbie level 4
hello everyone. Recently I wrote a program for SPI communication between 2 ATmega8 with CodeVision AVR compiler.
this is code for master that is transmitter
and this is for slave that is receiver
It works good and I receive '111' code on LCD that is code of 'o' character.But when I write send and receive codes on while loop, I cant see anything on LCD or it shows just 255 on LCD.
how can I fix it? how can I send data continual like send a counter?
please help me. Thanks.
this is code for master that is transmitter
Code:
#include <mega8.h>
#include <delay.h>
#define MISO 4
#define MOSI 3
#define SS 2
#define SCK 5
void spi_masterinit()
{
DDRB|=(1<<MOSI)|(1<<SCK)|(1<<SS);
DDRB&=~(1<<MISO);
SPCR=0x73;
PORTB|=(1<<SS);
}
void spi_write(unsigned char data)
{
PORTB&=~(1<<SS);
SPDR=data;
while(!(SPSR&(1<<SPIF)));
PORTB|=(1<<SS);
}
void main(void)
{
spi_masterinit();
spi_write('o');
while (1){
}
}and this is for slave that is receiver
Code:
#include <mega8.h>
#include <delay.h>
#include <stdio.h>
// Alphanumeric LCD Module functions
#include <alcd.h>
#define MISO 4
#define MOSI 3
#define SS 2
#define SCK 5
int i;
char a[20];
void spi_slaveinit()
{
DDRB|=(1<<MISO)|(1<<SCK);
DDRB&=~(1<<MOSI)|(1<<SS);
SPCR=0x73;
//PORTB&=~(1<<SS);
}
unsigned char spi_read()
{
SPDR='X';
while(!(SPSR&(1<<SPIF)));
return(SPDR);
}
void main(void)
{
spi_slaveinit();
lcd_init(16);
i=spi_read();
sprintf(a,"%d",i);
lcd_gotoxy(0,0);
lcd_puts(a);
while (1){
}
}It works good and I receive '111' code on LCD that is code of 'o' character.But when I write send and receive codes on while loop, I cant see anything on LCD or it shows just 255 on LCD.
how can I fix it? how can I send data continual like send a counter?
please help me. Thanks.