uint8_t main()
{
//initialization
uint16_t lm73_temp;
init_twi();
uart_init();
//set LM73 mode for reading temperature by loading pointer register
//this is done outside of the normal interrupt mode of operation
lm73_wr_buf[0] = LM73_PTR_TEMP; //load lm73_wr_buf[0]
//with temperature pointer address
twi_start_wr(LM73_WRITE, lm73_wr_buf, 2); //start the TWI write process
sei(); //enable interrupts to allow start_wr to finish
while(1)
{
//read temperature data from LM73 (2 Bytes)
twi_start_rd(LM73_READ, lm73_rd_buf, 2);
_delay_ms(2); //wait for it to finish
//now assemble the two bytes read back into one 16-bit value
lm73_temp = lm73_rd_buf[0]<<8; //save high temperature byte
lm73_temp |= lm73_rd_buf[1];//"OR" in the low temp byte to lm73_temp
lm73_temp = lm73_temp >>7; //parse out decimal place
itoa(lm73_temp, temp_val, 10); //convert to string in array
uart_puts(temp_val);
}
}
void read_LSM6DS3(uint8_t address, uint8_t *rd_buf){
uint8_t addr_buf[1];
// Save address to address buffer
addr_buf[0] = address;
// Write register address of where to read data from
twi_start_wr(LSM6DS3_WRITE, addr_buf, 1);
// Recieve data from register address and store in rd_buf
twi_start_rd(LSM6DS3_READ, rd_buf, 1);
// Wait until data is recieved
while(twi_busy());
}
/*****************************************************************************************
* Function: read_lm73
* Description: Function reads temperature data from sensor over twi and converts
* farenhiet or celsius basec on 3rd argument to lm73_temp_convert
* Arguments: None
* Return: None
****************************************************************************************/
void read_lm73()
{
twi_start_rd(LM73_ADDRESS, lm73_rd_buf, 2);
/* Copy high byte in */
lm73_temp = lm73_rd_buf[0];
/* Shift high byte to high byte location */
lm73_temp <<= 8;
/* Bring in the low byte */
lm73_temp |= lm73_rd_buf[1];
/* Convert int to string */
lm73_temp_convert(read_temp_string, lm73_temp, C);
/* Copy the digits to the display string */
lcd_temp_string[3] = read_temp_string[0];
lcd_temp_string[4] = read_temp_string[1];
}
int main ()
{
uint16_t lm73_temp; //a place to assemble the temperature from the lm73
spi_init(); //initalize SPI
lcd_init(); //initalize LCD (lcd_functions.h)
init_twi(); //initalize TWI (twi_master.h)
lm73_resolution_config();
//set LM73 mode for reading temperature by loading pointer register
//this is done outside of the normal interrupt mode of operation
//load lm73_wr_buf[0] with temperature pointer address
lm73_wr_buf[0] = LM73_PTR_TEMP;
//start the TWI write process (twi_start_wr())
twi_start_wr(LM73_ADDRESS, lm73_wr_buf, 1);
//enable interrupts to allow start_wr to finish
sei();
clear_display(); //clean up the display
while(1){ //main while loop
_delay_ms(100); //tenth second wait
clear_display(); //wipe the display
//read temperature data from LM73 (2 bytes) (twi_start_rd())
twi_start_rd(LM73_ADDRESS, lm73_rd_buf, 2);
_delay_ms(2); //wait for it to finish
//now assemble the two bytes read back into one 16-bit value
lm73_temp = lm73_rd_buf[0]; //save high temperature byte into lm73_temp
lm73_temp <<= 8; //shift it into upper byte
lm73_temp |= lm73_rd_buf[1]; //"OR" in the low temp byte to lm73_temp
itoa(lm73_temp, lcd_string_array, 2); //convert to string in array with itoa() from avr-libc
string2lcd(lcd_string_array); //send the string to LCD (lcd_functions)
} //while
} //main
