// *************************************************************************************************
// @fn temperature_measurement
// @brief Init ADC12. Do single conversion of temperature sensor voltage. Turn off ADC12.
// @param none
// @return none
// *************************************************************************************************
void temperature_measurement(u8 filter)
{
u16 adc_result;
volatile s32 temperature;
// Convert internal temperature diode voltage
adc_result = adc12_single_conversion(REFVSEL_0, ADC12SHT0_8, ADC12INCH_10);
// Convert ADC value to "xx.x °C"
// Temperature in Celsius
// ((A10/4096*1500mV) - 680mV)*(1/2.25mV) = (A10/4096*667) - 302
// = (A10 - 1855) * (667 / 4096)
temperature = (((s32) ((s32) adc_result - 1855)) * 667 * 10) / 4096;
// Add temperature offset
temperature += sTemp.offset;
// Store measured temperature
if (filter == FILTER_ON)
{
// Change temperature in 0.1° steps towards measured value
if (temperature > sTemp.degrees)
sTemp.degrees += 1;
else if (temperature < sTemp.degrees)
sTemp.degrees -= 1;
}
else
{
// Override filter
sTemp.degrees = (s16) temperature;
}
// New data is available --> do display update
display.flag.update_temperature = 1;
}
void battery_measurement(void)
{
/* Convert external battery voltage (ADC12INCH_11=AVCC-AVSS/2)
voltage = adc12_single_conversion(REFVSEL_2, ADC12SHT0_10,
ADC12SSEL_0, ADC12SREF_1, ADC12INCH_11,
ADC12_BATT_CONVERSION_TIME_USEC); */
uint16_t voltage = adc12_single_conversion(REFVSEL_1,
ADC12SHT0_10, ADC12INCH_11);
/* Convert ADC value to "x.xx V"
Ideally we have A11=0->AVCC=0V ... A11=4095(2^12-1)->AVCC=4V
--> (A11/4095)*4V=AVCC --> AVCC=(A11*4)/4095 */
voltage = (voltage << 2) / 41;
/* Correct measured voltage with calibration value */
voltage += battery_info.offset;
/* Discard values that are clearly outside the measurement range */
if (voltage > BATTERY_HIGH_THRESHOLD)
voltage = battery_info.voltage;
#ifndef CONFIG_BATTERY_DISABLE_FILTER
/* Filter battery voltage */
battery_info.voltage = ((voltage << 1)
+ (battery_info.voltage << 3)) / 10;
#else
/* Get it raw instead for testing */
battery_info.voltage = voltage;
#endif
/* Display blinking battery symbol if low */
if (battery_info.voltage < BATTERY_LOW_THRESHOLD)
display_symbol(0, LCD_SYMB_BATTERY, SEG_ON | BLINK_ON);
}
// *************************************************************************************************
// @fn do_light_measurement
// @brief Measures light level
// @param none
// @return none
// *************************************************************************************************
void do_light_measurement(void)
{
u16 voltage;
voltage = adc12_single_conversion(REFVSEL_1, ADC12SHT0_10, ADC12INCH_2);
voltage = (voltage * 2 * 2) / 41;
light.value = light.value*0.7 + voltage*0.3;
}
uint32_t battery_get_voltage(void) {
uint32_t voltage;
voltage = adc12_single_conversion(REFVSEL_1, ADC12SHT0_10, ADC12INCH_11);
/* Ideally we have A11=0->AVCC=0V ... A11=4095(2^12-1)->AVCC=4V
* --> (A11/4095)*4V=AVCC --> AVCC=(A11*4)/4095 */
voltage = (voltage * 2 * 2 * 1000) / 4095;
return voltage;
}
// *************************************************************************************************
// @fn battery_measurement
// @brief Init ADC12. Do single conversion of AVCC voltage. Turn off ADC12.
// @param none
// @return none
// *************************************************************************************************
void battery_measurement(void)
{
u16 voltage;
// Convert external battery voltage (ADC12INCH_11=AVCC-AVSS/2)
voltage = adc12_single_conversion(REFVSEL_1, ADC12SHT0_10, ADC12INCH_11);
// Convert ADC value to "x.xx V"
// Ideally we have A11=0->AVCC=0V ... A11=4095(2^12-1)->AVCC=4V
// --> (A11/4095)*4V=AVCC --> AVCC=(A11*4)/4095
voltage = (voltage * 2 * 2) / 41;
// Correct measured voltage with calibration value
voltage += sBatt.offset;
// Discard values that are clearly outside the measurement range
if (voltage > BATTERY_HIGH_THRESHOLD)
{
voltage = sBatt.voltage;
}
// Filter battery voltage
sBatt.voltage = ((voltage * 2) + (sBatt.voltage * 8)) / 10;
// If battery voltage falls below low battery threshold, set system flag and modify LINE2
// display function pointer
if (sBatt.voltage < BATTERY_LOW_THRESHOLD)
{
sys.flag.low_battery = 1;
// Set sticky battery icon
display_symbol(LCD_SYMB_BATTERY, SEG_ON);
}
else
{
sys.flag.low_battery = 0;
// Clear sticky battery icon
display_symbol(LCD_SYMB_BATTERY, SEG_OFF);
}
// Update LINE2
display.flag.line2_full_update = 1;
// Indicate to display function that new value is available
display.flag.update_battery_voltage = 1;
}
