// -----------------------------------------------------------------
int main() {
// Initialize the lcd
lcd_init();
fdev_setup_stream(&lcd_stream, lcd_putchar, 0, _FDEV_SETUP_WRITE);
lcd_clear_and_home();
// initialize eeprom and TWI/I2C
eeprom_init();
// specify 7 bit device address of eeprom chip
#define EEPROM_DEVICE_ID 0b1010000
fprintf_P(&lcd_stream, PSTR("24LC256 ADDR: %02X"), EEPROM_DEVICE_ID);
// specify eeprom memory address for data storage
#define EEPROM_DATA_ADDRESS 0x0000
// create local copy of eeprom data
EEPROM_DATA e_data;
// read eeprom contents at location 0000
e_data = read_eeprom(0);
// show what we read from the eeprom -
// note: the very first read on a new eeprom
// will show uninitalized data
show_eeprom_data(&e_data);
// process data
if(e_data.need_initalization){
// set all data item values if first time
e_data.need_initalization = false;
strcpy_P(e_data.author, PSTR("Noter"));
e_data.read_count = 1;
e_data.brightness = 0x33;
e_data.version = 1.01;
} else {
// check contents against the values written when initializing
if((e_data.version != 1.01)||
(strcmp_P(e_data.author, PSTR("Noter")) !=0)||
(e_data.brightness != 0x33)){
lcd_line_four();
fprintf_P(&lcd_stream, PSTR("DATA ERROR - "));
while(true); // and freeze
} else {
// increment read_count
e_data.read_count += 1;
}
}
// write data to eeprom memory at location 0000
write_eeprom(0, &e_data);
// and show the read count
lcd_line_two();
fprintf_P(&lcd_stream, PSTR("READ COUNT = %d"), e_data.read_count);
// done
while(true);
}
void getTemp() {
uint16_t last_sample = 0;
double this_temp;
double temp_avg;
uint16_t i;
temp_avg = 0.0;
for (i=0; i<500; i++) {
last_sample = adc_read();
this_temp = sampleToFahrenheit(last_sample);
temp_avg = temp_avg + this_temp/500.0;
}
double c = fahrenheitToCelsius(temp_avg);
double k = celsiusToKelvin(c);
// write message to LCD
lcd_init();
FILE lcd_stream = FDEV_SETUP_STREAM(lcd_putchar, 0, _FDEV_SETUP_WRITE);
lcd_home();
lcd_write_string(PSTR("ADC: "));
lcd_write_int16(last_sample);
lcd_write_string(PSTR(" of 1024 "));
lcd_line_two();
fprintf_P(&lcd_stream, PSTR("%.2f"), temp_avg);
lcd_write_data(0xdf);
lcd_write_string(PSTR("F"));
lcd_line_three();
fprintf_P(&lcd_stream, PSTR("%.2f"), c);
lcd_write_data(0xdf);
lcd_write_string(PSTR("C"));
lcd_line_four();
fprintf_P(&lcd_stream, PSTR("%.2f"), k);
lcd_write_data(0xdf);
lcd_write_string(PSTR("K"));
}
// optional callback function for TWI/I2C driver
void handle_TWI_result(uint8_t return_code){
if(return_code!=TWI_success){
lcd_line_four();
fprintf_P(&lcd_stream, PSTR("I2C ERROR - %02X"), return_code);
}
}