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MBhir.11
MBhir.11
Associate III
March 3, 2021
Solved

How to configure Timer to generate 7K pulses without using interrupt

  • March 3, 2021
  • 4 replies
  • 942 views

Hi,

I am using STM32cube IDE and trying to create project for STM32L151RCT6 MCU .

Requirement is like need to create 7Khz (means 143 microsec )pulse(i.e 71.4 micro sec ON and 71.4 microsec OFF) on Timer 4 channel 1 without using interrupt.

Not using PWM also, using counter method .

I checked some examples , all are interrupt based examples.

Please suggest me any link for reference

This topic has been closed for replies.
Best answer by MM..1

You can set all in MX inspire here

static void MX_TIM2_Init(void)
{
 
 /* USER CODE BEGIN TIM2_Init 0 */
 
 /* USER CODE END TIM2_Init 0 */
 
 TIM_MasterConfigTypeDef sMasterConfig = {0};
 TIM_OC_InitTypeDef sConfigOC = {0};
 
 /* USER CODE BEGIN TIM2_Init 1 */
 
 /* USER CODE END TIM2_Init 1 */
 htim2.Instance = TIM2;
 htim2.Init.Prescaler = 22;
 htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
 htim2.Init.Period = 8000;
 htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
 if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
 {
 Error_Handler();
 }
 sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
 sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
 if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
 {
 Error_Handler();
 }
 sConfigOC.OCMode = TIM_OCMODE_PWM1;
 sConfigOC.Pulse = 2000;
 sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
 sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
 if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN TIM2_Init 2 */
 
 /* USER CODE END TIM2_Init 2 */
 HAL_TIM_MspPostInit(&htim2);
 
}

4 replies

MM..1
MM..1
Super User
March 3, 2021

Your condition no PWM is ?? when you ask Timer 4 channel 1, you need define mode for this peripheral.

Datasheet say :  They feature four independent channels each for input capture/output compare, PWM or one-pulse mode output.

For any stable pwm you dont need interrupt or dma , only set registers for your desired mode and start HAL_TIM_PWM_Start(&htim4,TIM_CHANNEL_1);

MBhir.11
MBhir.11Author
Associate III
March 5, 2021

Hi,

Thanks for your reply i configured like that only channel 1: PWM generation CH1 and other parameter setting to generate 7KHz 50% duty cycle pulse.

I will check in Eval board and update u

MM..1
MM..1Best answer
Super User
March 5, 2021

You can set all in MX inspire here

static void MX_TIM2_Init(void)
{
 
 /* USER CODE BEGIN TIM2_Init 0 */
 
 /* USER CODE END TIM2_Init 0 */
 
 TIM_MasterConfigTypeDef sMasterConfig = {0};
 TIM_OC_InitTypeDef sConfigOC = {0};
 
 /* USER CODE BEGIN TIM2_Init 1 */
 
 /* USER CODE END TIM2_Init 1 */
 htim2.Instance = TIM2;
 htim2.Init.Prescaler = 22;
 htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
 htim2.Init.Period = 8000;
 htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
 if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
 {
 Error_Handler();
 }
 sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
 sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
 if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
 {
 Error_Handler();
 }
 sConfigOC.OCMode = TIM_OCMODE_PWM1;
 sConfigOC.Pulse = 2000;
 sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
 sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
 if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN TIM2_Init 2 */
 
 /* USER CODE END TIM2_Init 2 */
 HAL_TIM_MspPostInit(&htim2);
 
}

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