TRGO Timer1 to ITR0 Timer 15? Nucleo-L476

[SWenn.1]

I am trying to Trigger timer 15 from timer 1....Yellow in scope pic shows timer 1 output to be used as gated trigger... I am trying to get PWM gated out of Timer 15....

Can anyone tell me what I am doing wrong in the code bcz I get no PWM out of PA2?

CONFIGURATION:

  htim15.Instance = TIM15;
  htim15.Init.Prescaler = 20 - 1;
  htim15.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim15.Init.Period = 10;
  htim15.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim15.Init.RepetitionCounter = 0;
  htim15.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  if (HAL_TIM_Base_Init(&htim15) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim15, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_PWM_Init(&htim15) != HAL_OK)
  {
    Error_Handler();
  }
  sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;
  sSlaveConfig.InputTrigger = TIM_TS_ITR0;
  if (HAL_TIM_SlaveConfigSynchro(&htim15, &sSlaveConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim15, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 2;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
  sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
  if (HAL_TIM_PWM_ConfigChannel(&htim15, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
  sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
  sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
  sBreakDeadTimeConfig.DeadTime = 0;
  sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
  sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
  sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
  if (HAL_TIMEx_ConfigBreakDeadTime(&htim15, &sBreakDeadTimeConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM15_Init 2 */
 
  /* USER CODE END TIM15_Init 2 */
  HAL_TIM_MspPostInit(&htim15);

FUNCTION CALL:

  HAL_TIM_PWM_Start(&htim15, TIM_CHANNEL_1);

Thanks

[waclawek.jan]

Read out and check/post both TIM and the relevant GPIO registers' content.

JW

[SWenn.1]

Timer15 registers:

 

Timer1 registers:

Port A Timer15 output:

 

[waclawek.jan]

I don't see TIM15_SMCR. Is this from CubeIDE?

JW

PS.

@Imen DAHMEN​ , can you please check why is there not TIM15_SMS in STM32L476 in CubeIDE's registers view? Thanks.

[waclawek.jan]

The main problem most likely is, that in TIM1 you've selected Update as TRGO source in TIM1_CR2.MMS. Update event is only one clock wide, so that generates a very short pulse on TRGO, you can't use that as source for Gate in TIM15.

You need to configure one of the channels in TIM1 as Compare (PWM), to generate a relatively wide pulse, and use that as TRGO.

(Btw. I also don't understand why did you set TIM1_RCR=1, but in this case it should be harmless).

JW

[SWenn.1]

Thank you for the response....The RCR is because ultimately I want a 20 minute delay per trigger event...I was testing the RCR portion as well....I will look into making PWM compare out as you said when I get the opportunity.....