Logarithm function implementation

[Aryan]

Hello, we are trying to implement PWM function with an incrementing/ decrementing duty cycle using a logarithmic function rather than linear function. Is there any predefined function for logarithmic operation? Also, what data types are available to denote decimal or floating point variable.

Thank you.

[Einar Thorsrud]

Hi,

There is no direct way to get a logarithmic function like this. However, you could calculate the samples of your logarithmic functions and store them in a large array. Then you could use the PWM peripheral to simply "play out" the samples using DMA. This requires a bit of space but has the benefit that you can generate any pattern you like.