PWM Complimentory signal is not getting with HAL_TIM_PWM_Start_DMA

[thannara123]

Hello experts 

I am trying to make a PWM signal from DMA , with PWM + complimentory channel

When i use HAL API

HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, (uint32_t *)sin_table, 32);

// Here I get the signal as expected

 

But when I Use HAL API

HAL_TIMEx_PWMN_Start_DMA(&htim1, TIM_CHANNEL_1, (uint32_t *)sin_table, 32);

// It not driving the CH1N channel nothing getting

 

Whats the problem

[Sarra.S]

Hello @thannara123, 

Just start the CH1N with HAL_TIMEx_PWMN_Start()

[Tinnagit]

I had also try with HAL_TIMEx_PWMN_Start() but there is no affect to output too. it's like as there is something missing in side that function. 

[Sarra.S]

Hello, could you share your timer configuration

[Tinnagit]

This is my Timer 2 Initial.

 

static void MX_TIM2_Init(void)
{

 /* USER CODE BEGIN TIM2_Init 0 */

 /* USER CODE END TIM2_Init 0 */

 TIM_ClockConfigTypeDef sClockSourceConfig = {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 = 639;
 htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
 htim2.Init.Period = 999;
 htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
 if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
 {
 Error_Handler();
 }
 sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
 if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
 {
 Error_Handler();
 }
 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 = 0;
 sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
 sConfigOC.OCFastMode = TIM_OCFAST_ENABLE;
 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);

}

 

and I had try to start timer 2 in many way

 

// HAL_TIMEx_PWMN_Start_DMA(&htim2, TIM_CHANNEL_1, &dsin,360);
 HAL_TIM_Base_Start(&htim2);
// HAL_TIM_PWM_Start_DMA(&htim2, TIM_CHANNEL_1, &dsin,360);
// HAL_TIMEx_PWMN_Start_DMA(&htim2, TIM_CHANNEL_1, &dsin,360);

 

there are only HAL_TIM that it's work fine and HAL_TIMEX is nothing run even the register is not start too.

[thannara123]

 
 HAL_TIM_Base_Start_DMA(&htim2, TIM_CHANNEL_1, &dsin,360);
 HAL_TIMEx_PWMN_Start(&htim2, TIM_CHANNEL_1,);

Try it ,
will work 

[Tinnagit]

that has only HAL_TIM_Base_Start_DMA(&htim2, TIM_CHANNEL_1, &dsin,360); 
without HAL_TIMEx_PWMN_Start(&htim2, TIM_CHANNEL_1,);
it's still work fine.

so HAL_TIMEx_PWMN_Start(&htim2, TIM_CHANNEL_1,); , what 's necessary of it?

[Sarra.S]

The complementary signal output CH1N must be enabled independently, even without using the CH1 output.

[thannara123]

HAL_TIMEx_PWMN_Start(&htim2, TIM_CHANNEL_1,); // It is used to getout the complimentory signal of

 

 

[Tinnagit]

Oh, I got it. A Complementary one is negative PWM used for drive H bridge.