![]() To initialize the RCC use the following path: “Pinout & Configuration”-> System Core -> RCC.System Reset and Clock Control (RCC) Initialization Note that the pin turns orange to remind us of that timer 2 still needs to be configured. For example, we choose PB3 associated with Channel 2 of Timer 2 (TIM2_CH2). It is necessary to identify a GPIO to associate a timer to generate the PWM. Basic Configurations GPIO selection and configuration First of all, let's see how to configure the initialization code with the STCube tool. In this article, we will see how to configure and write an application to dim an LED connected to an output pin (GPIO) of the STM32F446RE Nucleo board. ![]() In this case, it can be generated using a timer made available by the microcontroller. Let's see now how it is possible to generate a PWM with STM32. PWM signal generation through Timer in STM32 diesel pressure regulator, EGR valve actuator, voltage regulator in modern alternators, turbocharger variable geometry regulation actuator, electric fans, etc. Among the various actuators used in a vehicle and controlled by PWM i.e. The use of PWM is also widely used in the automotive sector in electronic control units (ECU - Electronic Control Unit) to manage the energy to be supplied to some actuators, both fixed and variable frequency. The variation of the pulse width, made at a high frequency (kHz), is perceived as continuous and can be translated into a variation of the rotation speed of a motor, dimming a LED, driving an encoder, driving power conversion, and etc. The duty cycle can be between 0 and 1 and is generally expressed as a percentage (%). Once the switching frequency (f sw) has been chosen, the ratio between the switch-on time (T ON) and the switch-off time (T OFF) is varied.
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