Complementary Pwm in STM32F103C6T6A

[RChou.1]

In complementary PWM out put my dead time increases or decreases when i am varying the Auto reload register value. is there a solution like 45% of duty cycle with one out put inverted and second output non inverted.

 

This is my HAL_INITS along with Timer Hal Start and Method to change the frequency and duty.

static void MX_TIM1_Init(void)
{

 /* USER CODE BEGIN TIM1_Init 0 */

 /* USER CODE END TIM1_Init 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 = 0;
 htim1.Init.CounterMode = TIM_COUNTERMODE_DOWN;
 htim1.Init.Period = 400;
 htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 htim1.Init.RepetitionCounter = 0;
 htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
 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_PWM1;
 sConfigOC.Pulse = 0;
 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 = 110;
 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);

}

HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);
 
HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_1);


void pwmData(uint32_t dat){
 
 __HAL_TIM_SET_AUTORELOAD(&htim1,dat);
 __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1,dat/2);
}

 the change in frequency is ADC dependent. 

[waclawek.jan]

> In complementary PWM out put my dead time increases or decreases when i am varying the Auto reload register value.

How do you observe that? Show screenshot/photo exhibiting this change.

JW

 PS.

 htim1.Init.CounterMode = TIM_COUNTERMODE_DOWN;

Why?

[RChou.1]

sorry for being late to this reply, 

htim1.Init.CounterMode = TIM_COUNTERMODE_DOWN;

 any other configuration is not working thats why i used this.

[waclawek.jan]

Also, changing ARR and CCRx in runtime while having

 htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

and also possibly CCRx preload disable, may lead to surprising results.

JW

[RChou.1]

it will be such an appreciable if you could give me an example code to test and compare with that, so i can better understand the facts. I am totally new to stm32 and 32bit MCU as well.

[waclawek.jan]

I don't use Cube, but you should be able to find examples under the Projects directory of your Cube library installation. CubeMX should be able to generate you examples too.

JW

[RChou.1]

hello Mr  waclawek.jan

first of all kindly see my attached file with this comment i hope it will help you to get the exact problem i wanted to explain you. I am Using a 22K pot for varraying the arr register value and you will be able to see here my duty changes too with change in frequency. 

 

I don't use Cube, but you should be able to find examples under the Projects directory of your Cube library installation. CubeMX should be able to generate you examples too. and i didn't get what exactly you want me to try. If you don't use MXCUBE the you can give me you own firmware which will demonstrate me how i can meet my desire.

Thank you.