int16_t
temp_get(temp_unit_t unit)
{
int16_t res;
int16_t temp;
/* Return if temp sensor driver not initialized */
if (temp_initialized == false) {
return EOF;
}
/* Power up sensor */
TEMP_PORT |= (1 << TEMP_BIT_PWR);
/* Init ADC and measure */
adc_init(ADC_CHAN_ADC4, ADC_TRIG_FREE_RUN, ADC_REF_AVCC, ADC_PS_128);
adc_conversion_start();
while ((res = adc_result_get(ADC_ADJ_RIGHT)) == EOF ){
;
}
#if MEASURE_ADC2
/* Measure external voltage supply, routed to ADC2 through a 470K/100K divider*/
/* AVCC is 3.3 volts if using external supply, else Vbat which will be lower */
/* Convert result to millivolts assuming AVCC is 3.3 volts, on battery it will be lower! */
adc_init(ADC_CHAN_ADC2, ADC_TRIG_FREE_RUN, ADC_REF_AVCC, ADC_PS_128);
adc_conversion_start();
while ((ADC2_reading = adc_result_get(ADC_ADJ_RIGHT)) == EOF ){
;
}
ADC2_reading = (ADC2_reading*((470+100)*3300UL))/(100*1024UL);
#endif
adc_deinit();
/* Re-init the adc for buttons. */
key_init();
/* Power down sensor */
TEMP_PORT &= ~(1 << TEMP_BIT_PWR);
/* Get corresponding temperature from table */
if (unit == TEMP_UNIT_CELCIUS) {
temp = find_temp(res, temp_table_celcius, sizeof(temp_table_celcius)/sizeof(int)) + TEMP_ZERO_OFFSET_CELCIUS;
} else /*unit == TEMP_UNIT_FAHRENHEIT*/{
temp = find_temp(res, temp_table_fahrenheit, sizeof(temp_table_fahrenheit)/sizeof(int)) + TEMP_ZERO_OFFSET_FAHRENHEIT;
}
return temp;
}
key_state_t key_state_get(void)
{
key_state_t ret = KEY_NO_KEY;
int16_t res;
adc_init(ADC_CHAN_ADC1, ADC_TRIG_FREE_RUN, ADC_REF_AVCC, ADC_PS_128);
adc_conversion_start();
while ((res = adc_result_get(ADC_ADJ_RIGHT)) == EOF ){;}
adc_deinit();
if (res>0x0370) {
ret = KEY_NO_KEY;
}
else if (res>0x0280) {
ret = KEY_DOWN;
}
else if (res>0x0180) {
ret = KEY_LEFT;
}
else if (res>0x00C0) {
ret = KEY_RIGHT;
}
else {
ret = KEY_UP;
}
if (!(ENTER_PORT & (1<<ENTER_PIN))) {
ret |= KEY_ENTER;
}
return ret;
}
/** \brief Read current voltage
* \return EOF on error
*/
double
voltage_get() {
int16_t result;
/* Init ADC and measure */
adc_init(ADC_CHAN_ADC30, ADC_TRIG_FREE_RUN, ADC_REF_AVCC, ADC_PS_128);
adc_conversion_start();
while ((result = adc_result_get(ADC_ADJ_RIGHT)) == EOF ){
;
}
adc_deinit();
return 1.1 * (1024.0 / (double)result);
}
static int16_t supply_voltage_read(void)
{
int16_t adc_res;
// Read band gap voltage with Avcc as ref. Use result to calulate Vcc
adc_init(ADC_CHAN_VBG, ADC_TRIG_FREE_RUN, ADC_REF_AVCC, ADC_PS_128);
// wait for band gap voltage to stabilize
delay_us(150);
// read ADC
adc_conversion_start();
while ((adc_res = adc_result_get(ADC_ADJ_RIGHT)) == EOF ){;}
adc_deinit();
// Return battery voltage in mV
return (int16_t)((1100L*1024L)/(long)adc_res);
}
/** \brief Read current light's raw value
* \return EOF on error
*/
int16_t
sensor_light_get_raw()
{
int16_t result;
if (!light_initialized) {
light_init();
}
/* Power up sensor */
LIGHT_PORT |= (1 << LIGHT_BIT);
/* Init ADC and measure */
adc_init(ADC_CHAN_ADC4, ADC_TRIG_FREE_RUN, ADC_REF_AVCC, ADC_PS_128);
adc_conversion_start();
while ((result = adc_result_get(ADC_ADJ_RIGHT)) == EOF ){
;
}
adc_deinit();
/* Power down sensor */
LIGHT_PORT &= ~(1 << LIGHT_BIT);
return result;
}