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Incorrect pwm duration capture method #4

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skotopes opened this issue Sep 5, 2023 · 0 comments

skotopes commented Sep 5, 2023

furi_get_tick gives extremely unreliable value for any time computation.

There are at least 3 different ways to capture PWM duration:

hardware timer with capture compare channel. Precise.
Interrupt + DWT or hardware timer. Acceptable.
Polling in disable irq mode. Acceptable, but going to cause system lockup.

Also this sensor supports UART, which solves all problems.
I've made uart implementation that you can use in your project https://github.com/skotopes/flipperzero_mhz19_uart

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