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

[Ciuffoly www.audiodesignguide]

Here my new code to use encoder with STM32

First search on datasheet 2 pins with TIMx_CH1 and TIMx_CH2.

In my case was a STM32F469 and I have used PC6 and Pc7 with TIM8_CH1 and TIM8_CH2.

After search in the file stm32f4xx_hal_gpio_ex.h the relative AFx for your TIMx.

#define GPIO_AF3_TIM8 ((uint8_t)0x03) /* TIM8 Alternate Function mapping */

.

TIM_HandleTypeDef htim8;

uint32_t TIM8_save_counter = 0;

void MX_TIM8_Init(void)
{

TIM_Encoder_InitTypeDef sConfig = {0};

TIM_MasterConfigTypeDef sMasterConfig = {0};

GPIO_InitTypeDef gpio_init_structure;

__HAL_RCC_GPIOC_CLK_ENABLE();

__TIM8_CLK_ENABLE();

gpio_init_structure.Pin = GPIO_PIN_6|GPIO_PIN_7;

gpio_init_structure.Mode = GPIO_MODE_AF_PP;

gpio_init_structure.Pull = GPIO_PULLUP;

gpio_init_structure.Speed = GPIO_SPEED_LOW;

gpio_init_structure.Alternate = GPIO_AF3_TIM8;

HAL_GPIO_Init(GPIOC, &gpio_init_structure);

htim8.Instance = TIM8;

htim8.Init.Prescaler = 0;

htim8.Init.CounterMode = TIM_COUNTERMODE_UP;

htim8.Init.Period = 65535;

htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

htim8.Init.RepetitionCounter = 0;

htim8.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;

sConfig.EncoderMode = TIM_ENCODERMODE_TI12;

sConfig.IC1Polarity = TIM_ICPOLARITY_RISING;

sConfig.IC1Selection = TIM_ICSELECTION_DIRECTTI;

sConfig.IC1Prescaler = TIM_ICPSC_DIV1;

sConfig.IC1Filter = 10;

sConfig.IC2Polarity = TIM_ICPOLARITY_RISING;

sConfig.IC2Selection = TIM_ICSELECTION_DIRECTTI;

sConfig.IC2Prescaler = TIM_ICPSC_DIV1;

sConfig.IC2Filter = 0;

if (HAL_TIM_Encoder_Init(&htim8, &sConfig) != HAL_OK)

{

Error_Handler();

}

sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

if (HAL_TIMEx_MasterConfigSynchronization(&htim8, &sMasterConfig) != HAL_OK)

{

Error_Handler();

}

//HAL_TIM_Encoder_Start(&htim8, TIM_CHANNEL_ALL);

HAL_TIM_Encoder_Start(&htim8, TIM_CHANNEL_1|TIM_CHANNEL_2);

}

and in the main loop

if (TIM8->CNT != TIM8_save_counter)

{

if (TIM8_save_counter == 0 && TIM8->CNT == 65535)

buttonInUp();

else if (TIM8_save_counter == 65535 && TIM8->CNT == 0)

buttonInDown();

else if (TIM8_save_counter < TIM8->CNT)

buttonInDown();

else

buttonInUp();

TIM8_save_counter = TIM8->CNT;

}

[TDK]

What does the code do? To whom is this directed?