int main(void)
{
_delay_ms(2000);
DDRB=0xff;
TWI_init_master(); // Function to initialize TWI
while(1)
{
if(write_data==0x00)
write_data=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(255); // Function to write data in slave
TWI_stop(); // Function to send stop condition
_delay_ms(100); // Delay of 10 mili second
PORTB=0xff;
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(2000);
}
}
signed short int getdata(unsigned char add)
{
signed short int DATA;
TWI_start();
TWI_write_address(0xD2);
TWI_write_data(add);
TWI_repeated_start();
TWI_read_address(0xD3);
DATA=TWI_read_data();
TWI_stop();
return DATA;
}
void MPU_read_adress(unsigned char mpuAdress, unsigned char registerAdress, unsigned char* variable){
TWI_start();
TWI_check_ack(mpuAdress);
TWI_write_data(registerAdress);
TWI_repeated_start();
TWI_read_address(mpuAdress|0x01);
*variable = TWI_read_data();
TWI_stop();
}
void MPU_self_test(unsigned char mpuAdress){
char buf[17]=" ";
TWI_start();
TWI_check_ack(mpuAdress);
TWI_write_data(0x75);
TWI_repeated_start();
TWI_read_address(mpuAdress|0x01);
char response = TWI_read_data();
sprintf(buf,"Response: %x",response);
LCD_WriteText(buf);
TWI_stop();
}
char EE_read_byte(const int address)
{
char dummy;
//we need this for the first if()
dummy = TWI_start();
//as in EE_write_byte, first send the page address and the word address
if((dummy != 0x08) && (dummy != 0x10))
return TWSR;
if(TWI_write_data(EE_ADDR|((address>>7) & 0x000E)) != 0x18)
return TWSR;
if(TWI_write_data((char)(address)) != 0x28)
return TWSR;
//send a repeated start for entering master receiver mode
if(TWI_start() != 0x10)
return TWSR;
//send slave address, now with the read bit set
if(TWI_write_data((EE_ADDR|1)|((address>>7) & 0x000E)) != 0x40)
return TWSR;
//now get the data from the EEPROM, don't return ACK
if(TWI_read_data(0) != 0x58)
return TWSR;
//if everything was OK, return zero
return 0;
}
