PWM TIM15 CH2 CCR1/CCR2 STM32CUBEIDE

[grzeniux]

Hello guys

My microcontroller is: STM32L432KCU6 - nucleo board

I have a problem with PWM. I need to change TIM16 to TIM15 because TIM16 collides with I2C

So thats why I have to use TIM15... I need him to handle micro servo. When i use TIM16, everything works, the pulses and the duty cycle are correct, but when i use TIM15, unfortunately the duty cycle is still 0 

TIMx configurations:

Clock configuration:

There is a code that i use to handle micro servo, for TIM16 it works

int main(void)

{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */

  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */

  MX_GPIO_Init();

  MX_DMA_Init();

  MX_TIM16_Init();

  MX_TIM15_Init();

  /* USER CODE BEGIN 2 */

  HAL_TIM_PWM_Start(&htim16, TIM_CHANNEL_1);

  HAL_TIM_PWM_Start(&htim15, TIM_CHANNEL_2);

  /* USER CODE END 2 */

  /* Infinite loop */

  /* USER CODE BEGIN WHILE */

  while (1)

  {

// TIM 16 #######################

  htim16.Instance->CCR1 = 25; // 0 stopni

  HAL_Delay(2000);

   htim16.Instance->CCR1 = 50; // 45 stopni

   HAL_Delay(2000);

   htim16.Instance->CCR1 = 75; // 90 stopni

   HAL_Delay(2000);

   htim16.Instance->CCR1 = 110; // 153 stopnie

   HAL_Delay(2000);

   htim16.Instance->CCR1 = 125; // 180 stopni

   HAL_Delay(5000);

// TIM 15 #######################

  htim15.Instance->CCR2 = 25; // 0 stopni

  HAL_Delay(2000);

   htim15.Instance->CCR2 = 50; // 45 stopni

  HAL_Delay(2000);

   htim15.Instance->CCR2 = 75; // 90 stopni

   HAL_Delay(2000);

   htim15.Instance->CCR2 = 110; // 153 stopnie

   HAL_Delay(2000);

   htim15.Instance->CCR2 = 125; // 180 stopni

   HAL_Delay(5000);

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */

  }

  /* USER CODE END 3 */

}

Is anyone know what going on?

[TDK]

Your code doesn't output a TIM15 PWM signal until 13 seconds in. Are you waiting that long? Consider modifying TIM15 and TIM16 duty cycle at the same time.

Debug code, verify that TIM15->CNT is changing and that TIM15->CCR2 is updating appropriately.

[Tesla DeLorean]

At 80 MHz to get the TIM at 50 KHz you'd need a prescaler of 1600-1 not 1597

Although having a broader ARR of 20000-1 would give a lot finer resolution

Not showing initialization code, or pin configuration

Any conflicts on the pins used? Solder Bridge options, actually get to pin headers?

[grzeniux]

CNT is changing 

I discovered that when I power the device via external power then duty cycle = 0%, and when I disconnect it and leave the micro usb I have duty cycle = correct

I have no idea where I might have a short circuit or something

[TDK]

Seems like an issue in how the servo is connected then, or other hardware issue with it. PC3 is free on that board.

[waclawek.jan]

Read out and check/post relevant GPIO registers settings.

> PC3 is free on that board.

Why would we be talking about PC3?

JW