Issue with External Mode in Simulink when using ADC Injected Mode synchronized with PWM on STM32G4

Question

Amin 2025-7-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2178277-issue-with-external-mode-in-simulink-when-using-adc-injected-mode-synchronized-with-pwm-on-stm32g4

回答： Adit Kirtani 2025-7-8

Hello,

I’m working with Simulink and an STM32G4 series microcontroller. I’ve successfully set up PWM generation and configured the ADC in injected mode, synchronized with the PWM timer (TIM1).

However, when I enable External Mode in Simulink (for real-time parameter tuning and signal monitoring), the connection fails. Interestingly, everything works fine when I trigger the ADC using a different timer — the issue only occurs when TIM1 is used to trigger the injected ADC.

My setup:

Target: STM32G4 (e.g., STM32G4)
PWM generated using TIM1
ADC in injected mode, triggered by TIM1
External Mode communication over STLink (USB)

Question:

Is there a known limitation or conflict between External Mode and using injected ADC mode synchronized with PWM (via TIM1) on STM32 targets in Simulink?

Could this be related to timing/resource conflicts?

Do you have any suggestions or workarounds to maintain synchronized ADC injection while using External Mode?

Thanks in advance for your support!