interrupt in overflow event of timer in up/down mode

[abdelhadi]

Posted on August 02, 2016 at 10:58

Hello,

I use a nucleo stm32f401RC Evaluation Board for the regulation of a boost converter and I need to generate the interruption on the ON half-signal of PWM and I need also synchronize the conversion of 3 channel of the  adc using DMA with this interruption, to do this I set the timer 3 on the way up / down and I activated the global interruption of this timer.My first problem is that the interrupt generated in the overflow and underflow of the timer, I want an interrupt only on the overflow.Second problem, I generate a  event output of timer 3 for connecting it with the input trigger of the DMA and I got the same problem, the conversion is done on the overflow and underflow.int main(void){  HAL_Init();  /* Configure the system clock */  SystemClock_Config();  /* Initialize all configured peripherals */  MX_GPIO_Init();  MX_DMA_Init();  MX_ADC1_Init();  MX_TIM1_Init();  MX_TIM3_Init();  MX_TIM4_Init();      HAL_TIM_Base_Start_IT(&htim3);       HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_1);      TIM3->CCR1=0;       HAL_TIM_PWM_Start(&htim13,TIM_CHANNEL_2);       TIM3->CCR2=0;/  while (1)  {  }}/* TIM3 init function */void MX_TIM3_Init(void){  TIM_ClockConfigTypeDef sClockSourceConfig;  TIM_SlaveConfigTypeDef sSlaveConfig;  TIM_MasterConfigTypeDef sMasterConfig;  TIM_OC_InitTypeDef sConfigOC;  htim3.Instance = TIM3;  htim3.Init.Prescaler = 0;  htim3.Init.CounterMode = TIM_COUNTERMODE_CENTERALIGNED1;  htim3.Init.Period = 10000;  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;  HAL_TIM_Base_Init(&htim3);  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;  HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig);  HAL_TIM_PWM_Init(&htim3);  sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;  sSlaveConfig.InputTrigger = TIM_TS_ITR0;  HAL_TIM_SlaveConfigSynchronization(&htim3, &sSlaveConfig);  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;  HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig);  sConfigOC.OCMode = TIM_OCMODE_PWM1;  sConfigOC.Pulse = 0;  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_2);  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_3);  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_4);}/* ADC1 init function */void MX_ADC1_Init(void){  ADC_ChannelConfTypeDef sConfig;    /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)     */  hadc1.Instance = ADC1;  hadc1.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;  hadc1.Init.Resolution = ADC_RESOLUTION12b;  hadc1.Init.ScanConvMode = ENABLE;  hadc1.Init.ContinuousConvMode = ENABLE;  hadc1.Init.DiscontinuousConvMode = DISABLE;  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_FALLING;  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T3_TRGO;  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;  hadc1.Init.NbrOfConversion = 4;  hadc1.Init.DMAContinuousRequests = ENABLE;  hadc1.Init.EOCSelection = EOC_SINGLE_CONV;  HAL_ADC_Init(&hadc1);    /**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.     */  sConfig.Channel = ADC_CHANNEL_1;  sConfig.Rank = 2;  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;  HAL_ADC_ConfigChannel(&hadc1, &sConfig);    /**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.     */  sConfig.Channel = ADC_CHANNEL_3;  sConfig.Rank = 3;  HAL_ADC_ConfigChannel(&hadc1, &sConfig);    /**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.     */  sConfig.Channel = ADC_CHANNEL_4;  sConfig.Rank = 4;  HAL_ADC_ConfigChannel(&hadc1, &sConfig);}void TIM3_IRQHandler(void){  /* USER CODE BEGIN TIM3_IRQn 0 */  /* USER CODE END TIM3_IRQn 0 */  HAL_TIM_IRQHandler(&htim3);  /* USER CODE BEGIN TIM3_IRQn 1 */  HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_8);    TIM4->CCR1=5000;//duty_reg;  /* USER CODE END TIM3_IRQn 1 */}in attachement  a screenshot  of the PWM and GPIO togled in the IRQ handlerAny help would be much appreciated!Many thanks,

[Amel NASRI]

Posted on August 31, 2016 at 16:06

Hi bou.abdel

I suggest you refer to the

http://www.st.com/content/ccc/resource/technical/document/application_note/group0/91/01/84/3f/7c/67/41/3f/DM00236305/files/DM00236305.pdf/jcr:content/translations/en.DM00236305.pdf

(General-purpose timer cookbook) and its associated firmware (

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32cube-expansion-software/x-cube-timcooker.html

). It contains some examples that may be helpful for you, mainly the ones using DMA.-Mayla-