How to change pwm polarity or PWM mode after each DMA cycle.

[HJang.3]

I am using STM32F103C8T6, timer 1 ch 1 to generate complementary PWM

with variable duty cycle Using DMA buffer

 HAL_TIM_Base_Start(&htim1);
 HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, (uint32_t *) base, 30);
 HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_1);

Now i want to invert PWM polarity or PWM mode after each DMA transfer.

without changing Phase of PWM.

Thanks.

[waclawek.jan]

This probably can't be done without transients.Simply change polarity in the DMA transfer complete interrupt, or maybe delay it by some fixed time.

JW

[HJang.3]

can you please tell how to change polarity during transfer complete interrupt.

[thannara123]

Hai did you find the solution ?

[Andrew Neil]

continued in:

https://community.st.com/t5/stm32-mcus-products/hal-tim-pwm-start-dma-amp-gt-after-tcif-amp-gt-need-to-change/td-p/711287