diff options
Diffstat (limited to 'driver/temp_sensor/thermistor.h')
| -rw-r--r-- | driver/temp_sensor/thermistor.h | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/driver/temp_sensor/thermistor.h b/driver/temp_sensor/thermistor.h index af3ea398c8..49edee5451 100644 --- a/driver/temp_sensor/thermistor.h +++ b/driver/temp_sensor/thermistor.h @@ -33,7 +33,7 @@ struct thermistor_info { }; /** - * @brief Calculate temperature using linear interpolation of data points. + * Calculate temperature using linear interpolation of data points. * * Given a set of datapoints, the algorithm will calculate the "step" in * between each one in order to interpolate missing entries. @@ -44,8 +44,9 @@ struct thermistor_info { * @return temperature in C */ int thermistor_linear_interpolate(uint16_t mv, - const struct thermistor_info *info); + const struct thermistor_info *info); +#ifdef CONFIG_THERMISTOR_NCP15WB /** * ncp15wb temperature conversion routine. * @@ -54,5 +55,42 @@ int thermistor_linear_interpolate(uint16_t mv, * @return temperature in C. */ int ncp15wb_calculate_temp(uint16_t adc); +#endif /* CONFIG_THERMISTOR_NCP15WB */ + +#ifdef CONFIG_STEINHART_HART_3V3_13K7_47K_4050B +/** + * Reads the specified ADC channel and uses a lookup table and interpolation to + * return a temperature in degrees K. + * + * The lookup table is based off of a resistor divider circuit on 3.3V with a + * 13.7K resistor in series with a thermistor with nominal value of 47K (at 25C) + * and a B (25/100) value of 4050. + * + * @param idx_adc The idx value from the temp_sensor_t struct, which is + * the ADC channel to read and convert to degrees K + * @param temp_ptr Destination for temperature (in degrees K) + * + * @return EC_SUCCESS, or non-zero if error. + */ +int get_temp_3v3_13k7_47k_4050b(int idx_adc, int *temp_ptr); +#endif + +#ifdef CONFIG_STEINHART_HART_3V3_51K1_47K_4050B +/** + * Reads the specified ADC channel and uses a lookup table and interpolation to + * return a temperature in degrees K. + * + * The lookup table is based off of a resistor divider circuit on 3.3V with a + * 51.1K resistor in series with a thermistor with nominal value of 47K (at 25C) + * and a B (25/100) value of 4050. + * + * @param idx_adc The idx value from the temp_sensor_t struct, which is + * the ADC channel to read and convert to degrees K + * @param temp_ptr Destination for temperature (in degrees K) + * + * @return EC_SUCCESS, or non-zero if error. + */ +int get_temp_3v3_51k1_47k_4050b(int idx_adc, int *temp_ptr); +#endif #endif /* __CROS_EC_TEMP_SENSOR_THERMISTOR_NCP15WB_H */ |