Slave mode trigger on STM32F411RE

[christophe2]

Posted on September 02, 2015 at 15:38

Hi,

I'm trying to enable the timer 2 on a rising edge of a signal that i have connect on the tim2_ch1. I understand that the slave trigger mode of the timer can do that. I want to generate a signal on the tim2_ch2 on the rising edge of the tim2_ch1. Additionally, I would like to generate another signal on tim3_ch2 on the rising edge of the tim2_ch2. I did that by connecting the tim2 and tim3 as master and slave and it's worked. But the tim2_ch2 is generated before the rising edge of the tim2_ch1. Is it possible to start a counter on an external trigger or i have missed something? I've copied my program below :    

TimHandle.Instance = TIM2;

  TimHandle.Init.ClockDivision = 0;   TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;   TimHandle.Init.Period =  10; //Compteur_SCK   TimHandle.Init.Prescaler = 0;   TimHandle.Init.RepetitionCounter = 0;   ocConfig.OCMode = TIM_OCMODE_TOGGLE;   ocConfig.OCPolarity = TIM_OCPOLARITY_HIGH;   icConfig.ICFilter         = 1;   icConfig.ICPolarity         = TIM_ICPOLARITY_RISING;   icConfig.ICPrescaler         = TIM_ICPSC_DIV1;   icConfig.ICSelection         = TIM_ICSELECTION_DIRECTTI;   if(HAL_TIM_OC_Init(&TimHandle) != HAL_OK)   {     Error_Handler();   }   if(HAL_TIM_OC_ConfigChannel(&TimHandle,&ocConfig,TIM_CHANNEL_2) != HAL_OK)   {     Error_Handler();   }   if(HAL_TIM_IC_ConfigChannel(&TimHandle,&icConfig,TIM_CHANNEL_1) != HAL_OK)   {     Error_Handler();   }   slaveConfig.InputTrigger = TIM_TS_TI1FP1;   slaveConfig.SlaveMode = TIM_SLAVEMODE_TRIGGER;   slaveConfig.TriggerFilter = 1;   slaveConfig.TriggerPolarity = TIM_TRIGGERPOLARITY_RISING;   slaveConfig.TriggerPrescaler = TIM_TRIGGERPRESCALER_DIV1;   if( HAL_TIM_SlaveConfigSynchronization(&TimHandle,&slaveConfig) != HAL_OK)   {     Error_Handler();   }   masterConfig.MasterOutputTrigger =  TIM_TRGO_OC2REF;   masterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;   if(HAL_TIMEx_MasterConfigSynchronization(&TimHandle,&masterConfig) != HAL_OK)   {     Error_Handler();   }   /////////////////////////////////////////////////////////////////////////////////   /////////////////////////////////////////////////////////////////////////////////   Tim2Handle.Instance = TIM3;   Tim2Handle.Init.ClockDivision = 0;   Tim2Handle.Init.CounterMode = TIM_COUNTERMODE_UP;   Tim2Handle.Init.Period = 2000;   Tim2Handle.Init.Prescaler = 0;   oc2Config.OCMode = TIM_OCMODE_PWM1;   oc2Config.OCPolarity = TIM_OCPOLARITY_HIGH;   oc2Config.Pulse     = 20;   if(HAL_TIM_OC_Init(&Tim2Handle) != HAL_OK)   {     Error_Handler();   }   if(HAL_TIM_PWM_ConfigChannel(&Tim2Handle,&oc2Config,TIM_CHANNEL_2) != HAL_OK)   {     Error_Handler();   }   if(HAL_TIM_IC_ConfigChannel(&Tim2Handle,&icConfig,TIM_CHANNEL_1) != HAL_OK)   {     Error_Handler();   }   slaveConfig.InputTrigger = TIM_TS_ITR1;   slaveConfig.SlaveMode = TIM_SLAVEMODE_TRIGGER;   slaveConfig.TriggerFilter = 1;   slaveConfig.TriggerPolarity = TIM_TRIGGERPOLARITY_RISING;   slaveConfig.TriggerPrescaler = TIM_TRIGGERPRESCALER_DIV1;   if( HAL_TIM_SlaveConfigSynchronization(&Tim2Handle,&slaveConfig) != HAL_OK)   {       Error_Handler();   }   if(HAL_TIM_IC_Start(&TimHandle,TIM_CHANNEL_1) != HAL_OK)   {   Error_Handler();   }   if(HAL_TIM_IC_Start(&Tim2Handle,TIM_CHANNEL_1) != HAL_OK)   {   Error_Handler();   }   if(HAL_TIM_OC_Start(&TimHandle,TIM_CHANNEL_2) != HAL_OK)   {     Error_Handler();   }   if(HAL_TIM_OC_Start(&Tim2Handle,TIM_CHANNEL_2) != HAL_OK)   {       Error_Handler();   } Thanks for your help, sorry for my english.. #trigger #timer #stm32f4

[waclawek.jan]

Posted on September 02, 2015 at 18:26

Your english is OK, what I don't understand is the Cube gibberish.

Post the content of relevant registers, including registers for the GPIO pin you use as external trigger. JW

[christophe2]

Posted on September 03, 2015 at 11:02

Thanks for your answer,

I've copied some registers values, I hope it helps to find the solution, I can provide more values if you need. The pins which are used for TIM1 are : tim1_ch1 : PA8 tim1_ch2 : PA9 tim2_ch1 : PA0 tim2_ch2 : PA1 Timer 1 Register : BDTR : MOE = 1 (Main Output Enable) CCER : CC1E = 1 (Capture enable)               CC2E = 1 (Compare enable) CCMR1_Input : CC1S = 1 (CC1 Channel configure as input, IC1 mapped on TI1) CCMR1_Output : CC1S  = 1 (CC1 Channel configure as input, IC1 mapped on TI1 )                             OC1M  = 1 (Set channel 1 to active level on match)                             OC2M  = 3 (OC2REF toggle when CNT = CCR) CR1 : CEN = 1 (Counter enable) CR2 : MMS = 5 ( OC2REF is used a signal trigger output) SMCR : MSM = 1 ( Master Slave mode enabled)                SMS = 6 ( slave Trigger mode)                   TS = 5  ( Filtered timer input 1)

GPIOA Register

: MODER : MODER0  = 2 (Alternate function mode)                   MODER1  = 2                   MODER8  = 2                   MODER9  = 2 PUPDR : PUPDR0 = 0 (AF0 is selected)                 PUPDR1 = 0                  PUPDR8 = 0                  PUPDR9 = 0

[waclawek.jan]

Posted on September 03, 2015 at 11:44

> I can provide more values if you need.

I don't need them - it's YOU who needs them! 🙂 1. GPIOA->AFRL/AFRH? 2. Once TIM1->CR1.EN is set, there's no point in triggering - the only thing the trigger does is it *sets* CR1.EN, never resets it. This kind of problems can be effectively debugged directly by writing/observing registers in the debugger. First, get the capture working - set the timer to free running, set GPIO appropriately, enable capture, then externally toggle the pin's level and observe changes in the capture register. JW

[christophe2]

Posted on September 03, 2015 at 15:23

I have found the problem by doing step by step and observing the registers values.

CR1.EN was enabled before the capture on channel 1 and others values like MOE and CC1E was not properly set. Thanks a lot for your support 🙂