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Toggling pin PE9 using SMT32F407G DISCO board

LMorr.3
Senior II

I am not able to get pin PE9 to toggle using timer1 and Channel1 as a PWM Output. I have tried different configurations for the timer with no success. The timer does run as expected, and all parameters and interrupts work. The only issue is pin PE9 does not toggle or enable at any time while the timer runs.

UPDATE: I connected the pin to one of the dev board's leds and it does turn on as expected. For some reason, when I use the following to inspect the pin status, it always shows as '0' or off. Does anyone know why the led turns on but the GPIOE would show '0' when I stop the debugger to inspect the register?

Here is my config for TIM1:

 TIM_ClockConfigTypeDef sClockSourceConfig = {0};

 TIM_MasterConfigTypeDef sMasterConfig = {0};

 TIM_OC_InitTypeDef sConfigOC = {0};

 TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};

 /* USER CODE BEGIN TIM1_Init 1 */

 /* USER CODE END TIM1_Init 1 */

 htim1.Instance = TIM1;

 htim1.Init.Prescaler = 65535;

 htim1.Init.CounterMode = TIM_COUNTERMODE_UP;

 htim1.Init.Period = 65535;

 htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

 htim1.Init.RepetitionCounter = 0;

 htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

 if (HAL_TIM_Base_Init(&htim1) != HAL_OK)

 {

  Error_Handler();

 }

 sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

 if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)

 {

  Error_Handler();

 }

 if (HAL_TIM_PWM_Init(&htim1) != HAL_OK)

 {

  Error_Handler();

 }

 sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

 sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

 if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)

 {

  Error_Handler();

 }

 sConfigOC.OCMode = TIM_OCMODE_PWM2;

 sConfigOC.Pulse = 10000;

 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(&htim1, &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(&htim1, &sBreakDeadTimeConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /* USER CODE BEGIN TIM1_Init 2 */

 /* USER CODE END TIM1_Init 2 */

 HAL_TIM_MspPostInit(&htim1);

12 REPLIES 12
LMorr.3
Senior II

Here is main.c. I'm sure it's something simple I'm overlooking.

I moved to alternate pin PE9 from PA8 to see if that made a difference.

I am looking at the GPIOA->IDR register in the debugger but is showing the pin as low, and am not sure if I am missing the pin toggling since the TIM1 still runs in the background even though the debugger is paused.

I have not connected my scope to the pin yet as I want to find out why I cannot see it set in debugger or uart.

By the way, I'm not sure what 'check/post' is. Let me know and I'll do that as well.

Thank you for your help.

LMorr.3
Senior II

Fixed! I had the pin set as Open Drain instead of PushPull for some reason.

Thanks for all your help!