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rusefi 2018-12-09 14:47:24 -05:00
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firmware/hw_layer/digital_input_hw.cpp
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* @file digital_input_hw.cpp
* @brief Helper methods related to Input Capture Unit (ICU)
*
* There are some ChibiOS limitation or STM32 limitations or limitations of my brain
*
* See http://www.chibios.com/forum/viewtopic.php?t=1461
* "PWM input requires a whole timer on the STM32.
* You could use channel 1 and channel 2 of the same timer but not simultaneously.
* Giovanni"
*
* See http://www.chibios.com/forum/viewtopic.php?f=2&t=247&hilit=icu+channel&start=50
* "It is not possible, the TIM timers support one ICU channel at time.
* Giovanni"
*
* See https://stackoverflow.com/questions/43440599/stm32-multi-channel-input-capture-overcapturing-on-all-channels-interrupts-not
* where they seem to be capturing something on multiple channels maybe not PWM mode of ICU is the key difference?
*
*
* @date Jun 23, 2013
* @author Andrey Belomutskiy, (c) 2012-2018
*/