Change Polarity of PWM with DMA in circular mode

Hello Experts ,

I am generating a two-Channel PWM with complementary channels also 

HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, (uint32_t *)sin_table, 20);//low
HAL_TIMEx_PWMN_Start_IT(&htim1, TIM_CHANNEL_1);
HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_2, (uint32_t *)sin_table, 20); //high
HAL_TIMEx_PWMN_Start_IT(&htim1, TIM_CHANNEL_2);

I am using DMA in circular mode .

I require when the total complete transfer occur the Polarity of the above channel ie Channel 1 and channel should or change . 

@BarryWhit 

@MM..1 

@Sarra.S 

void PWM_PulseFinishedCallback(TIM_HandleTypeDef *htim)
{ if (htim->hdma[TIM_DMA_ID_CC1] != NULL && htim->hdma[TIM_DMA_ID_CC1] == &hdma_tim1_ch1)
 {
 HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);

 if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
 {
 HAL_TIM_PWM_Stop_DMA(&htim1, TIM_CHANNEL_1);
 HAL_TIMEx_PWMN_Stop(&htim1, TIM_CHANNEL_1);
 // Stop PWM on CH2 and CH2N before toggling polarity
 HAL_TIM_PWM_Stop_DMA(&htim1, TIM_CHANNEL_2);
 HAL_TIMEx_PWMN_Stop(&htim1, TIM_CHANNEL_2);
 // Toggle the polarity bits for CH1 and CH1N
 htim1.Instance->CCER ^= (TIM_CCER_CC1P | TIM_CCER_CC1NP);
 // Toggle the polarity bits for CH2 and CH2N
 htim1.Instance->CCER ^= (TIM_CCER_CC2P | TIM_CCER_CC2NP);
HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, (uint32_t *)sin_table, 200);
	 HAL_TIMEx_PWMN_Start_IT(&htim1, TIM_CHANNEL_1);
	 HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_2, (uint32_t *)sin_table, 200);
	 HAL_TIMEx_PWMN_Start_IT(&htim1, TIM_CHANNEL_2);

I tried the following way , After trigger the callback it stops the PWM and not start again ?

How can obtain it ?