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Yuan1 · 2021-10-26

I want to use TIM1_CH1 to measure pulse width. TIM1 works under slave reset mode. The input trigger is TI1FP1. Ideally, TIM1 resets upon rising input, then TIM1_CH1 captures the falling edge. The CCR1 value would be the pulse width. The problem is th...

Yuan1 · 2021-06-09

I use timer gated mode for a HC-SR04 ultrasonic sensor which needs microsecond delay. Is it possible to use the same timer as time base to get microseconds? if (HAL_TIM_Base_Start(&htim3) != HAL_OK) // time base for usDelay() Error_Handler(); if ...

Yuan1 · 2021-10-27

The problem was solved by selecting TI1_ED as the trigger source. TriggerPolarity is RISING, while ICPolarity is falling.sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET; sSlaveConfig.InputTrigger = TIM_TS_TI1F_ED; sSlaveConfig.TriggerPolarity = TIM...

Yuan1 · 2021-10-27

This would be a very useful feature.

Yuan1 · 2021-10-27

Yes, you are right. TI1FP1 is the same signal feeding both the slave controller and input capture module. That's why their polarity is always the same. Using one channel under reset mode can only capture the rising edge.

Yuan1 · 2021-10-26

The chip is F4CCU6 with the latest hal firmware (1.26.2). I tried the "input PWM mode" example. It works fine. In that example, two channels are used to measure both frequency and duty cycle. A rising TI2FP2 triggers timer into reset, then channel 1 ...

Yuan1 · 2021-06-09

You are right. DWT also works in nondebug mode. Just found out that I forgot to init DWT.void DWT_Init(void) { if (!(CoreDebug->DEMCR & CoreDebug_DEMCR_TRCENA_Msk)) { CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk; DWT->CYCCNT = 0...

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Timer slave trigger polarity for input capture

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