Ben-buxton-rotary-encoder-for-C

Super fast rotary encoder state machine with builtin debounce.
This is a C port of the famous Ben Buxton's rotary encoder for Arduino. I did this with the original intent of using it with my STM32 blue pill.
The original library is for Arduino and I had to strip out the consructor and make a few changes to make it work in C.
Link to original Arduino library: https://github.com/buxtronix/arduino/tree/master/libraries/Rotary. Visit this for details. on the original library

Demo video of my implementation:https://www.youtube.com/watch?v=Ni7hV8GAgFg

The original function definition is changed to unsigned char Pin_process(unsigned int _pin1,unsigned int _pin2) . This means the digital state of the encoder pins must be previously sampled and fed to the function.

Half step output is enabled by default and can be disabled.

Code snippet for reference

pinb5 = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5);   //digital read on STM32
pinb6 = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_6);   //digital read on STM32

result = Pin_process(pinb5,pinb6);
if (result == DIR_CW) {
      count++;
      HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
    } else if (result == DIR_CCW) {
      --count;
      HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
    }