Handling of more than 15 EXTI lines

[patrickschneider9]

Hi there,

I just wondered if any of you would have an idea about my current problem, or faced similar challenges:

For a new project I would need about 20 configurable EXTI lines, which exceeds the number of any STM32 MCU as far as we know. How could we still achieve that with additional hardware circuitry or any "tricks" on the MCU? I thought about having DMA configured to read GPIO registers to a memory buffer, but don't know if that will really work.

Any ideas are appreciated!

[Pavel A.]

one chip, TI, 24 inputs. Or 16 inputs.

[patrickschneider9]

I need to be able to detect up to 15kHz PWM and the corresponding duty cycle.

[patrickschneider9]

I need to be able to detect up to 15kHz PWM and the corresponding duty cycle.