EXT vs ICU: which one should I use?

[Dolence]

Hi!

I wanna count pulses from a hall effect based flow meter. Knowing how much pulses per liter this sensor outputs and counting the total pulses while the liquid passes through the sensor, I should be able to measure how much of liquid has been dispensed in a more or less accurate way.
Should I use EXT or ICU to achieve this?

Thanks in advance!

[Giovanni]

Hi,

You could use both for this but EXT is obsolete. In ChibiOS 18 you can use the PAL driver to do the same things more easily.

At the end you just count interrupts with both methods so just use the least expensive option. You may also use a timer at low level as a pulse counter and not have to serve interrupts.

Giovanni

[Dolence]

I'm on chibistudio and ChibiOS 17.6. Chibios 18 is trunk? I'm planning to use ugfx in this project and I don't know if it's ready to work alongside with development branch. Regarding timer at low level without using interrupts, is there any example of something similar on demos?

[Giovanni]

Regarding timer at low level without using interrupts, is there any example of something similar on demos?

Low level things are documented in the STM32 Reference Manual, TIMxx section.

Giovanni