Is stm32 micro-controls are capable to calculate Natural Logarithm ?

[LACTIC]

I am using Thermistor (NTC Type ) as temperature sensor .

So to calculate the temperature from adc value of STM32 I am using this formula(taken from this site :- https://www.jameco.com/jameco/workshop/techtip/temperature-measurement-ntc-thermistors.html)

1/T = 1/T0 + 1/B * ln( ( adcMax / adcVal ) – 1 )

where :-

T0= 298.15 K

B=3345.80 K

I am using Board 6-Bit adc .

So I want ask that can I use above formula in my program, because I am confuse that controller can calculate "ln (Natural Logarithm) ".

[saiteja]

Interface temperature sensor with any of the adc pin in controller, from pin read the value

sysTemperature = HAL_ADC_GetValue(&hadc1); 

sysTemp_inmV = ((float)sysTemperature/4096.0) * 3300; //ref = 3.3

sysTemp_inCel = sysTemp_inmV/10

[LACTIC]

Thanks.

Here 12bit adc enable ?

Because 4096 is value 2^12.

[waclawek.jan]

Following functions calculate the natural logarithm (base e):

#include <math.h>

double log(double x);

float logf(float x);

long double logl(long double x);

You may also try to avoid the log calculation by tabulating the function at a suitable step and linearly interpolate between the steps; or by fittingthe function by polynomial.

JW

[LACTIC]

OK

[Amel NASRI]

Does this mean that you got the answer you look for? If yes, please click on "Select as Best" for the good answer.