StudentDVPS na 12:57, 1. február 2013

2013-02-01T12:57:01Z

StudentDVPS: Vytvorená stránka „ /* * I2C.c * * Created: 15.01.2013 19:05:05 * Author: Tomáš Statečný */ #include #include #include "I2C.h" #in...“

2013-02-01T12:55:25Z

Vytvorená stránka „<source lang="c"> * I2C.c * * Created: 15.01.2013 19:05:05 * Author: Tomáš Statečný: #include <inttypes.h> #include <compat/twi.h> #include "I2C.h" #in...“

Nová stránka

<source lang="c">
/*
* I2C.c
*
* Created: 15.01.2013 19:05:05
* Author: Tomáš Statečný
*/

#include <inttypes.h>
#include <compat/twi.h>

#include "I2C.h"
#include "lcd.h"

//Zadefinovanie CPU fekvencie v Hz pokial nie je dana
#ifndef F_CPU
#define F_CPU 16000000UL
#endif

//Zadefinovanie I2C frekvencie v Hz
#define SCL_CLOCK 100000L

//Inicializacia I2C
void i2c_init(void)
{
TWSR = 0; //No prescaler
TWBR = ((F_CPU/SCL_CLOCK)-16)/2; //must be > 10 for stable operation
}

//Zadefinovanie vstupov a vystupov
#define SDA_I (DDRC &= ~(1<<4)) //Nastavenie 4bit DDRC na citanie (SDA)
#define SCL_O (DDRC |= (1<<5)) //Nastavenie 5bit DDRC na zapis (SCL)
#define SDA_O (DDRC |= (1<<4)) //Nastavenie 4bit DDRC na zapis (SDA)

//Nastavovanie pinov
#define SETBIT_SCL (PORTC |= (1<<5)) //Zapis log.1 na pin 5 PORTC (SCL)
#define CLEARBIT_SCL (PORTC &= ~(1<<5)) //Zapis log.0 na pin 5 PORTC (SCL)

#define SETBIT_SDA (PORTC |= (1<<4)) //Zapis log.1 na pin 4 PORTC (SDA)
#define CLEARBIT_SDA (PORTC &= ~(1<<4)) //Zapis log.0 na pin 4 PORTC (SDA)
#define CHECKBIT_SDA (PORTC & (1<<4)) //Zistenie stavu na pin 4 PORTC (SDA)

//Funkcia na meranie teploty alebo vlhkosti pre snimac SHT11
unsigned Measure(char CMD){
char i;
char j = 0x80;
unsigned hodnot = 0;

SDA_O;
SETBIT_SDA;
_delay_us(5);
SCL_O;
CLEARBIT_SCL;
_delay_ms(100);

//Reset merania
for(i=0; i<10; i++){

SDA_O;
SETBIT_SDA;
_delay_us(5);
SCL_pulse();
}

//Incializacia prenosu
SDA_O;
CLEARBIT_SDA;
_delay_us(5);

SCL_O;
SETBIT_SCL;
_delay_ms(5);
SCL_O;
CLEARBIT_SCL;
_delay_ms(5);

SDA_O;
CLEARBIT_SDA;
_delay_us(5);
SCL_pulse();

SDA_O;
SETBIT_SDA;
_delay_us(5);

SCL_O;
SETBIT_SCL;
_delay_ms(5);
SCL_O;
CLEARBIT_SCL;
_delay_ms(5);

_delay_ms(20);

//Adresa prikazu
for(i=0; i<8; i++){

SDA_O;
if(!(j & CMD)) CLEARBIT_SDA;

else SETBIT_SDA;

_delay_us(5);
SCL_pulse();

j >>= 1;
}

//Overie ACK bitu
SDA_I;
SCL_pulse();

if(CHECKBIT_SDA) return 0;

SCL_O;
CLEARBIT_SCL;
_delay_ms(100);

SDA_I;
while(!CHECKBIT_SDA);

//Pockaj, dokial sa neprenesu data
SDA_I;
while(CHECKBIT_SDA);

//Vycitanie prveho Byte
for(i=0; i<8; i++){
hodnot <<= 1;

SDA_I;
if(CHECKBIT_SDA){
hodnot |= 1;
_delay_us(5);
SCL_pulse();
}
}

//Odoslanie ACK bitu
SDA_O;
CLEARBIT_SDA;
_delay_us(5);
SCL_pulse();

//Vycitanie druheho Byte
for(i=0; i<8; i++){
hodnot <<= 1;

SDA_I;
if(CHECKBIT_SDA){
hodnot |= 1;
_delay_us(5);
SCL_pulse();
}
}

return hodnot; //Vrati hodnotu bez kontrolneho suctu
}

//Zadefinovanie jednej periody SCL
int SCL_pulse(){

SCL_O;
CLEARBIT_SCL;
_delay_ms(5);
SCL_O;
SETBIT_SCL;
_delay_ms(5);
return 0;
}

← Staršia verzia		Verzia z 12:57, 1. február 2013
Riadok 29:		Riadok 29:

	//Zadefinovanie vstupov a vystupov		//Zadefinovanie vstupov a vystupov
	#define SDA_I (DDRC &= ~(1<<4)) //Nastavenie 4bit DDRC na citanie (SDA)		#define SDA_I (DDRC &= ~(1<<4)) //Nastavenie 4bit DDRC na citanie (SDA)
	#define SCL_O (DDRC \|= (1<<5)) //Nastavenie 5bit DDRC na zapis (SCL)		#define SCL_O (DDRC \|= (1<<5)) //Nastavenie 5bit DDRC na zapis (SCL)
	#define SDA_O (DDRC \|= (1<<4)) //Nastavenie 4bit DDRC na zapis (SDA)		#define SDA_O (DDRC \|= (1<<4)) //Nastavenie 4bit DDRC na zapis (SDA)

	//Nastavovanie pinov		//Nastavovanie pinov
	#define SETBIT_SCL (PORTC \|= (1<<5)) //Zapis log.1 na pin 5 PORTC (SCL)		#define SETBIT_SCL (PORTC \|= (1<<5)) //Zapis log.1 na pin 5 PORTC (SCL)
	#define CLEARBIT_SCL (PORTC &= ~(1<<5)) //Zapis log.0 na pin 5 PORTC (SCL)		#define CLEARBIT_SCL (PORTC &= ~(1<<5)) //Zapis log.0 na pin 5 PORTC (SCL)

	#define SETBIT_SDA (PORTC \|= (1<<4)) //Zapis log.1 na pin 4 PORTC (SDA)		#define SETBIT_SDA (PORTC \|= (1<<4)) //Zapis log.1 na pin 4 PORTC (SDA)
	#define CLEARBIT_SDA (PORTC &= ~(1<<4)) //Zapis log.0 na pin 4 PORTC (SDA)		#define CLEARBIT_SDA (PORTC &= ~(1<<4)) //Zapis log.0 na pin 4 PORTC (SDA)
	#define CHECKBIT_SDA (PORTC & (1<<4)) //Zistenie stavu na pin 4 PORTC (SDA)		#define CHECKBIT_SDA (PORTC & (1<<4)) //Zistenie stavu na pin 4 PORTC (SDA)

	//Funkcia na meranie teploty alebo vlhkosti pre snimac SHT11		//Funkcia na meranie teploty alebo vlhkosti pre snimac SHT11
Riadok 155:		Riadok 155:
	}		}

	return hodnot; //Vrati hodnotu bez kontrolneho suctu		return hodnot; //Vrati hodnotu bez kontrolneho suctu
	}		}

I2C.c - História úprav

StudentDVPS na 12:57, 1. február 2013

StudentDVPS: Vytvorená stránka „ /* * I2C.c * * Created: 15.01.2013 19:05:05 * Author: Tomáš Statečný */ #include #include #include "I2C.h" #in...“