mrb, aşağıdaki master ve slave için koyduğum programlar twi ile iki microişlemcinin birbirine veri göndermesi için ancak ilk veri, master transmitter olduğunda gönderildikten sonra birdaha slave tarafından master 'a veri gelmiyor her ikisinede LCD bağlayıp denedim olmadı yardımcı olur musunuz?
MASTER
/*
* twi_master.c
*
* Created: 16.09.2014 12:51:27
* Author: BERKAY
*/
#define F_CPU 1000000
#include <stdio.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <inttypes.h>
#include "lcd.h"
void TWI_start(void);
void TWI_repeated_start(void);
void TWI_init_master(void);
void TWI_write_address(unsigned char);
void TWI_read_address(unsigned char);
void TWI_write_data(unsigned char);
void TWI_read_data(void);
void TWI_stop(void);
volatile unsigned char address=0x20, read=1, write=0;
volatile unsigned char write_data=0x03, recv_data;
FILE lcd_str = FDEV_SETUP_STREAM(lcd_putc, NULL, _FDEV_SETUP_WRITE);
int main(void){
DDRD=0XFF;
lcd_init(LCD_DISP_ON);
stdout = stdin = &lcd_str;
_delay_ms(10);
TWI_init_master(); // Function to initialize TWI
lcd_clrscr();
lcd_gotoxy(2,0);
lcd_puts("TWI MASTER");
while(1)
{
TWI_start(); // Function to send start condition
TWI_write_address(address+write); // Function to write address and data direction bit(write) on SDA
TWI_write_data(write_data); // Function to write data in slave
TWI_stop(); // Function to send stop condition
_delay_ms(10); // Delay of 10 mili second
TWI_start();
TWI_read_address(address+read); // Function to write address and data direction bit(read) on SDA
TWI_read_data(); // Function to read data from slave
TWI_stop();
_delay_ms(10);
write_data = write_data * 2;
}
}
void TWI_init_master(void) // Function to initialize master
{
TWBR=0x01; // Bit rate
TWSR=(0<<TWPS1)|(0<<TWPS0); // Setting prescalar bits
// SCL freq= F_CPU/(16+2(TWBR).4^TWPS)
}
void TWI_start(void)
{
// Clear TWI interrupt flag, Put start condition on SDA, Enable TWI
TWCR= (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);
while(!(TWCR & (1<<TWINT))); // Wait till start condition is transmitted
while((TWSR & 0xF8)!= 0x08); // Check for the acknowledgement
}
void TWI_repeated_start(void)
{
// Clear TWI interrupt flag, Put start condition on SDA, Enable TWI
TWCR= (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);
while(!(TWCR & (1<<TWINT))); // wait till restart condition is transmitted
while((TWSR & 0xF8)!= 0x10); // Check for the acknoledgement
}
void TWI_write_address(unsigned char data)
{
TWDR=data; // Address and write instruction
TWCR=(1<<TWINT)|(1<<TWEN); // Clear TWI interrupt flag,Enable TWI
while (!(TWCR & (1<<TWINT))); // Wait till complete TWDR byte transmitted
while((TWSR & 0xF8)!= 0x18); // Check for the acknoledgement
}
void TWI_read_address(unsigned char data)
{
TWDR=data; // Address and read instruction
TWCR=(1<<TWINT)|(1<<TWEN); // Clear TWI interrupt flag,Enable TWI
while (!(TWCR & (1<<TWINT))); // Wait till complete TWDR byte received
while((TWSR & 0xF8)!= 0x40); // Check for the acknoledgement
}
void TWI_write_data(unsigned char data)
{
TWDR=data; // put data in TWDR
TWCR=(1<<TWINT)|(1<<TWEN); // Clear TWI interrupt flag,Enable TWI
while (!(TWCR & (1<<TWINT))); // Wait till complete TWDR byte transmitted
while((TWSR & 0xF8) != 0x28); // Check for the acknoledgement
}
void TWI_read_data(void)
{
TWCR=(1<<TWINT)|(1<<TWEN); // Clear TWI interrupt flag,Enable TWI
while (!(TWCR & (1<<TWINT))); // Wait till complete TWDR byte transmitted
while((TWSR & 0xF8) != 0x58); // Check for the acknoledgement
recv_data=TWDR;
lcd_gotoxy(0,1);
printf("%d",recv_data);
}
void TWI_stop(void)
{
// Clear TWI interrupt flag, Put stop condition on SDA, Enable TWI
TWCR= (1<<TWINT)|(1<<TWEN)|(1<<TWSTO);
while(!(TWCR & (1<<TWSTO))); // Wait till stop condition is transmitted
}
SLAVE
/*
* twi_slave.c
*
* Created: 16.09.2014 13:06:27
* Author: BERKAY
*/
#define F_CPU 1000000
#include <stdio.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "lcd.h"
void TWI_init_slave(void);
void TWI_match_read_slave(void);
void TWI_read_slave(void);
void TWI_match_write_slave(void);
void TWI_write_slave(void);
volatile unsigned char write_data,recv_data;
FILE lcd_str = FDEV_SETUP_STREAM(lcd_putc, NULL, _FDEV_SETUP_WRITE);
int main(void){
DDRD=0XFF;
lcd_init(LCD_DISP_ON);
stdout = stdin = &lcd_str;
TWI_init_slave(); // Function to initilaize slave
lcd_clrscr();
lcd_gotoxy(3,0);
lcd_puts("TWI SLAVE");
while(1)
{
TWI_match_read_slave(); //Function to match the slave address and slave direction bit(read)
TWI_read_slave(); // Function to read data
write_data=recv_data; // Toggle the receive data
TWI_match_write_slave(); //Function to match the slave address and slave dirction bit(write)
TWI_write_slave(); // Function to write data
}
}
void TWI_init_slave(void) // Function to initilaize slave
{
TWAR=0x20; // Fill slave address to TWAR
}
void TWI_write_slave(void) // Function to write data
{
TWDR= write_data; // Fill TWDR register whith the data to be sent
TWCR= (1<<TWEN)|(1<<TWINT); // Enable TWI, Clear TWI interrupt flag
while((TWSR & 0xF8) != 0xC0); // Wait for the acknowledgement
}
void TWI_match_write_slave(void) //Function to match the slave address and slave dirction bit(write)
{
while((TWSR & 0xF8)!= 0xA8) // Loop till correct acknoledgement have been received
{
// Get acknowlegement, Enable TWI, Clear TWI interrupt flag
TWCR=(1<<TWEA)|(1<<TWEN)|(1<<TWINT);
while (!(TWCR & (1<<TWINT))); // Wait for TWINT flag
}
}
void TWI_read_slave(void)
{
// Clear TWI interrupt flag,Get acknowlegement, Enable TWI
TWCR= (1<<TWINT)|(1<<TWEA)|(1<<TWEN);
while (!(TWCR & (1<<TWINT))); // Wait for TWINT flag
while((TWSR & 0xF8)!=0x80); // Wait for acknowledgement
recv_data=TWDR; // Get value from TWDR
lcd_gotoxy(0,1);
printf("%d",recv_data);
}
void TWI_match_read_slave(void) //Function to match the slave address and slave dirction bit(read)
{
while((TWSR & 0xF8)!= 0x60) // Loop till correct acknoledgement have been received
{
// Get acknowlegement, Enable TWI, Clear TWI interrupt flag
TWCR=(1<<TWEA)|(1<<TWEN)|(1<<TWINT);
while (!(TWCR & (1<<TWINT))); // Wait for TWINT flag
}
}