Using TIM1 CH1 External Clock on PE9 to Trigger DMA on GPIOE→IDR (Callbacks Never Fire)

[johnotraffic]

Hello everyone,

I’m working with an STM32H743VIHX and CubeMX 6.13.0-RC5, and I’m trying to capture a square-wave clock on PE9 (mapped to TIM1_CH1) so that each rising edge:

1. Increments the TIM1 counter (External Clock Mode 1 via TI1FP1)

2. Fires a DMA transfer from GPIOE->IDR into a circular buffer

3. Invokes my HAL_DMA_RxHalfCpltCallback() / HAL_DMA_RxCpltCallback()

Even though I can see the TIM1 counter increment (and even wrap around), my DMA callbacks never get called.

Here’s what I’ve set up:

• PE9 → AF1 → TIM1_CH1

• Slave Mode

  • Slave Mode = External Clock Mode 1

  • Trigger = TI1FP1

  • Polarity = Rising

• Channel 1

  • ICSelection = Direct TI1

  • ICPolarity = Rising

  • Filter = 0

• DMA1_Stream1 is used for TIM1_CH1

• NVIC: DMA1_Stream1_IRQn enabled

Has anyone successfully used TIM1_CH1 → DMA1_Stream1 on an STM32H7?

I’ll attach my full main.cand stm32h7xx_hal_msp.c, files below. Any help would be greatly appreciated!

Thank you in advance for your insights.

[TDK]

Ensure buffer is somewhere that DMA can access.

When code fails to behave as expected, debug it and examine the state handles for evidence of errors. Implement error callbacks.