[SOLVED] --- Encoder very easy code ---

[Ciuffoly www.audiodesignguide]

Here the code to read encoder.

unsigned int   Enc_dir;
unsigned int  save_a = 0, save_b = 0;
 
 
 
void BSP_Encoder_Init()
{
  GPIO_InitTypeDef  gpio_init_structure;
 
  __HAL_RCC_GPIOF_CLK_ENABLE();
 
  gpio_init_structure.Pin = GPIO_PIN_8;
  gpio_init_structure.Mode = GPIO_MODE_IT_RISING_FALLING;
  gpio_init_structure.Pull = GPIO_PULLUP;
 
  HAL_GPIO_Init(GPIOF, &gpio_init_structure);
 
  gpio_init_structure.Pin = GPIO_PIN_9;
  gpio_init_structure.Mode = GPIO_MODE_IT_RISING_FALLING;
  gpio_init_structure.Pull = GPIO_PULLUP;
 
  HAL_GPIO_Init(GPIOF, &gpio_init_structure);
 
  HAL_NVIC_SetPriority(EXTI9_5_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI9_5_IRQn);
}
 
void EXTI9_5_IRQHandler(void)
{
    uint8_t now_a;
    uint8_t now_b;
 
    now_a = HAL_GPIO_ReadPin(GPIOF, GPIO_PIN_8);
    now_b = HAL_GPIO_ReadPin(GPIOF, GPIO_PIN_9);
 
    if (!save_a & !save_b)
    {
	    if (now_a)
	    {
	        save_a = now_a;
	        Enc_dir = 2;
	    }
	    if (now_b)
	    {
	        save_b = now_b;
	        Enc_dir = 1;
	    }
    }
    if (save_a & !save_b)
    {
	    if (!now_a)
	    {
	        save_a = now_a;
	        Enc_dir = 1;
	    }
	    if (now_b && now_a)
	    {
	        save_b = now_b;
	        Enc_dir = 2;
	    }
    }
    if (save_a & save_b)
    {
	    if (!now_a)
	    {
	        save_a = now_a;
	        Enc_dir = 2;
	    }
	    if (!now_b)
	    {
	        save_b = now_b;
	        Enc_dir = 1;
	    }
    }
    if ((!save_a) & (save_b))
    {
	    if (now_a)
        {
	        save_a = now_a;
	        Enc_dir = 1;
	    }
	    if (!now_b)
        {
	        save_b = now_b;
	        Enc_dir = 2;
	    }
    }
    HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_8);
    HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_9);
}
 
 
......
 
	    if (Enc_dir > 0)
	    {
	        if (Enc_dir == 2)
	               buttonUpClicked();
	        else
	  	       buttonDownClicked();
 
	  	    Enc_dir = 0;
	    }
 
 

[waclawek.jan]

I personally would run this in regular timer interrupt, unless your encoder is a "machine" one with guaranteed no bouncing on edges (i.e. not the hand-turned input).

JW