But while implementing, we need to take care of few things and we will see them along this explanation. Yeah I know it's not that hard to understand it. (4) Now the frequency can be calculated by first finding the difference between these 2 captured values and than dividing the timer clock by this difference. (3) On detecting the second rising edge, another TIMESTAMP will be captured and stored (2) Here we are going to capture the TIMESTAMP and store it in some variable (1) Whenever a rising edge is detected, a callback function is called. Input capture works in the following way:. In this tutorial, I will only cover the frequency part and the pulse width will be covered in next one where we will use PWM Input to do that. ![]() So today We are going to use one of the functionality of STM32 Timers i.e Input Capture.Īs the name implies, Input capture is used to capture the input signal given to the microcontroller and measures its frequency and pulse width. In our case it will be (1MHz/0xffffffff) Hz. I am leaving the ARR to 0xffffffff (Max for 32 bit Timer) The minimum frequency that the Timer can read is equal to (TIMx CLOCK/ARR). The Prescalar is set o 90, which would divide the APB2 clock by 90, making the Timer 2 clock 1 MHz. ![]() Timers are and always have been one of the most challenging topic in any microcontroller. I have enabled the Input capture Direct Mode for channel 1. Im trying to measure time passed between two external interrupts generated by. Today I have finally decided to write on this topic. Electrical STM32 Input capture PWM frequency measurement problem using HAL.
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