TWI question

[ste]

Hello I am trying to take data from ads1100 using atmega32. I tried with http://www.engineersgarage.com/embedded/avr-microcontroller-projects/atmega32-twi-two-wire-interface?destination=node/1040, code from here. I have set the propper address and so no but it doesn't work. It fails just on start.

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
    {
        uart_send_str( "error on start" );
    }
}

Can anyone advice me?

Thanks in advance!

[GANEEV SINGH]

Hi

This kind of thing generally happens when you do not pull up SDA and SCL pins. Recheck your circuit once.

[Author]

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