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

HJang.3 · ‎2022-09-13

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 · ‎2022-09-14

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 · ‎2022-09-14

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

thannara123 · ‎2024-08-21

Hai did you find the solution ?

Andrew Neil · ‎2024-08-21

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