Temperature Sensor service.

#include "asf.h"
#include "temp_sensor.h"

Functions
static uint16_t	adc_start_read_result (void)
	ADC START and Read Result. More...

static float	calculate_temperature (uint16_t raw_code)
	Temperature Calculation. More...

static float	convert_dec_to_frac (uint8_t val)
	Decimal to Fraction Conversation. More...

void	get_temp_sensor_data (uint8_t *data)
	Function to read the temperature sensor value. More...

static void	load_calibration_data (void)
	Calibration Data. More...

void	temp_sensor_init (void)
	ADC Temperature Sensor mode configuration. More...

static double	temp_sensor_value (int type)

Variables
struct adc_module	adc_instance

static uint16_t	ADCH

static uint16_t	ADCR

static float	coarse_temp

static float	fine_temp

static float	INT1VH

static float	INT1VR

static float	tempH

static float	tempR

static float	VADCH

static float	VADCR

static uint16_t adc_start_read_result ( void )

static

ADC START and Read Result.

          This function starts the ADC and wait for the ADC
          conversation to be complete   and read the ADC result
          register and return the same to calling function.

Parameters

[out] ADC result value

References adc_get_status(), adc_instance, adc_read(), adc_start_conversion(), and ADC_STATUS_RESULT_READY.

Referenced by temp_sensor_value().

static float calculate_temperature ( uint16_t raw_code )

static

Temperature Calculation.

         This function calculate fine temperature using Equation1 and Equation
         1b as mentioned in data sheet section "Temperature Sensor Characteristics"
         of Electrical Characteristics.

Parameters

[in]	ADC	output value
[out]	Temperature	value in Celsius

References ADC_12BIT_FULL_SCALE_VALUE_FLOAT, coarse_temp, fine_temp, INT1V_VALUE_FLOAT, INT1VH, INT1VR, tempH, tempR, VADCH, and VADCR.

Referenced by temp_sensor_value().

static float convert_dec_to_frac ( uint8_t val )

static

Decimal to Fraction Conversation.

          This function converts the decimal value into fractional
          and return the fractional value for temperature calculation

Parameters

[out] Fraction value of Decimal

Referenced by load_calibration_data().

void get_temp_sensor_data ( uint8_t * data )

Function to read the temperature sensor value.

Parameters

[out] Pointer to Temperature Sensor output value

References temp_sensor_value().

Referenced by get_resource_data().

static void load_calibration_data ( void )

static

Calibration Data.

This function extract the production calibration data information from Temperature log row content and store it variables for temperature calculation

References ADC_12BIT_FULL_SCALE_VALUE_FLOAT, ADCH, ADCR, convert_dec_to_frac(), INT1V_DIVIDER_1000, INT1VH, INT1VR, tempH, tempR, VADCH, and VADCR.

Referenced by temp_sensor_value().

void temp_sensor_init ( void )

ADC Temperature Sensor mode configuration.

Function to initialize the ADC for reading temperature sensor value.

This function enables internal temperature sensor feature of ADC with below Settings

GLCK for ADC -> GCLK_GENERATOR_2 (16MHz) CLK_ADC -> 1.6 KHz REFERENCE -> internal 1 V POSITIVE INPUT -> INTRENAL Temperature reference NEGATIVE INPUT -> GND SAMPLES -> 4 SAMPLE_LENGTH -> 4

References ADC_CLOCK_PRESCALER_DIV2, adc_enable(), adc_get_config_defaults(), adc_init(), adc_instance, ADC_NEGATIVE_INPUT_GND, ADC_POSITIVE_INPUT_TEMP, ADC_TEMP_SAMPLE_LENGTH, adc_config::clock_prescaler, adc_config::clock_source, GCLK_GENERATOR_2, adc_config::negative_input, adc_config::positive_input, adc_config::reference, adc_config::sample_length, system_voltage_reference_disable(), system_voltage_reference_enable(), SYSTEM_VOLTAGE_REFERENCE_OUTPUT, and SYSTEM_VOLTAGE_REFERENCE_TEMPSENSE.