DS1624+ATMEGA32+AVR GCC

[Ivan]

i have a problem with communications ATMEGA32 and DS1624 with I2C/TWI… 

anybody helps?

 

code:

 

#define F_CPU 8000000UL
#include <avr/io.h>
#include <avr/delay.h>
#include <compat/twi.h>

#define START 0X08
#define PONOVLJENI_START 0X10
#define MASTER_PRIMIO_PODATAK_ACK 0X50
#define MASTER_PRIMIO_PODATAK_NACK 0X58
#define MT_SLA_ACK 0x18
#define MT_DATA_ACK 0x28

#define DS1624_W 0x90
#define DS1624_R 0x91
#define ACCESS_MEMORY 0X17
#define ACCESS_CONFIG 0XAC
#define READ_TEMPERATURE 0XAA
#define START_CONVERT 0XEE
#define STOP_CONVERT OX22
#define CONVERSION 0x00

unsigned char TWI_master(void);
unsigned char TWI_start(void);
unsigned char TWI_repeat_start(void);
unsigned char TWI_posalji_adresu(unsigned char);
unsigned char TWI_posalji_command_protocol(unsigned char);
unsigned char TWI_conversion(unsigned char);
unsigned char TWI_primi_MSB(unsigned char);
unsigned char TWI_primi_LSB(unsigned char);
unsigned char TWI_stop(void);

unsigned char DS1624_init(void);
unsigned char DS1624_convert(void);
unsigned char DS1624_temperaturaH(unsigned char);

unsigned char temp,tempH,tempL,C1,C2;

int main(void)
{
DDRB=0xFF;

TWI_master();
//_delay_ms(500);
DS1624_init();

float tm;

while(1)
{

DS1624_convert();
_delay_ms(500);

DS1624_temperaturaH(temp);
PORTB=temp;
}
}

unsigned char TWI_master(void)
{
TWCR=0x00;
TWBR=0x02;
TWSR=0x00;
TWCR=0x44;
}

unsigned char TWI_start(void)
{
TWCR= (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);
while(!(TWCR & (1<<TWINT)));
while((TWSR & 0xF8)!= START);

}

unsigned char TWI_repeat_start(void)
{
TWCR= (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);
while(!(TWCR & (1<<TWINT)));
while((TWSR & 0xF8)!= PONOVLJENI_START);
}

unsigned char TWI_posalji_adresu(unsigned char adresa)
{
TWDR=adresa;
TWCR=(1<<TWINT)|(1<<TWEN);
while (!(TWCR & (1<<TWINT)));
while((TWSR & 0xF8)!= MT_SLA_ACK);
}

unsigned char TWI_posalji_command_protocol(unsigned char data)
{
TWDR=data;
TWCR=(1<<TWINT)|(1<<TWEN);
while (!(TWCR & (1<<TWINT)));
while((TWSR & 0xF8) != MT_DATA_ACK);
}

unsigned char TWI_conversion(unsigned char conv)
{
TWDR=conv;
TWCR=(1<<TWINT)|(1<<TWEN);
while (!(TWCR & (1<<TWINT)));
while((TWSR & 0xF8) != MT_DATA_ACK);

}

unsigned char TWI_primi_MSB(unsigned char MSB)
{
TWCR = (1<<TWEA)|(1<<TWINT)|(1<<TWEN);
while (!(TWCR & (1<<TWINT)));
while((TWSR & 0xF8) != MASTER_PRIMIO_PODATAK_ACK);
MSB=TWDR;
}

unsigned char TWI_primi_LSB(unsigned char LSB)
{
TWCR = (1<<TWEA)|(1<<TWINT)|(1<<TWEN);
while (!(TWCR & (1<<TWINT)));
while((TWSR & 0xF8) != MASTER_PRIMIO_PODATAK_NACK);
LSB=TWDR;
}

unsigned char TWI_stop(void)
{
TWCR= (1<<TWINT)|(1<<TWEN)|(1<<TWSTO);
while(!(TWCR & (1<<TWSTO)));
}

unsigned char DS1624_init(void)
{
TWI_start();
TWI_posalji_adresu(DS1624_W);
TWI_posalji_command_protocol(ACCESS_CONFIG);
TWI_conversion(CONVERSION);
TWI_stop();

}

unsigned char DS1624_convert(void)
{
TWI_start();
TWI_posalji_adresu(DS1624_W);
TWI_posalji_command_protocol(START_CONVERT);
TWI_stop();

}

unsigned char DS1624_temperaturaH(unsigned char tempC)
{
TWI_start();
TWI_posalji_adresu(DS1624_W);
TWI_posalji_command_protocol(READ_TEMPERATURE);
TWI_repeat_start();
TWI_posalji_adresu(DS1624_R);
TWI_primi_MSB(tempH);
_delay_ms(500);
TWI_primi_LSB(tempL);
_delay_ms(500);
TWI_stop();

}

[AJISH ALFRED]

Please share what exact problem are you facing with the code?

[Amrith]

Hi Ivan,

 

Looks fine with the program, did you add proper external pull up resistors to the lines SCL & SDA. If yes, can you tell me what problem you re facing.

 

Regards

Amrith

[Amrith]

Hi Ivan,

 

Looks fine with the program, did you add proper external pull up resistors to the lines SCL & SDA. If yes, can you tell me what problem you re facing.

 

Regards

Amrith

[Author]

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