This code gives you a demo to use GPIO pins of STM32F4 as digital output and digital input. But as soon as you release the push button, LEDs turn off. When you press and hold the push button, all four LEDs turn on (green, yellow, red, and blue). This code controls on-board LEDs of the STM32F4 board with an onboard push button. The values which can be passed to Pull member are: This parameter can be a value of GPIO_Alternate_function_selection */ Uint32_t Alternate /*!< Peripheral to be connected to the selected pins. This parameter can be a value of GPIO_speed_define */ Uint32_t Speed /*!< Specifies the speed for the selected pins. This parameter can be a value of GPIO_pull_define */ Uint32_t Pull /*!< Specifies the Pull-up or Pull-Down activation for the selected pins. This parameter can be a value of GPIO_mode_define */ Uint32_t Mode /*!< Specifies the operating mode for the selected pins. This parameter can be any value of GPIO_pins_define */ Uint32_t Pin /*!< Specifies the GPIO pins to be configured. In HAL libraries, these internal pull-ups and pull-down resistors can be configured through the GPIO_InitTypeDef struct by passing corresponding values to Pull member of the GPIO_InitTypeDef C struct. STM32F407VG GPIO ports also have internal pull-up and pull-down resistors which can be configured through the PUPDR register. As if the input signal is acting as ground.Internal Pull-up and Pull-down Resistors STM32F4 I attached a oscilloscope on another circuit PWM signal, it shows the right signals but as soon as I attach the STM32 input pin, the signal goes to zero volts. In Arduino, a small resistance doesn't make a difference. If I attach a resistor of 20 ohms between STM32 PWM and STM32 Input pin, it doesn't work.My 1st concern is : are you in the frequency range of detection of this example ? Since it is detecting PWM from STM32 at 50Hz, it shouldn't be a problem I guess Which frequency is your STM32 generated PWM ? I tried 50Hz, 100Hz - all work Even if some STM32 pin are tolerante to5V it is not the case of all pins. Warning: Arduino Uno is basically 5V whereas STM32 is 3,3V. Is you PWM from another circuit 5V or 3,3V ? I have tried both 5v and 3.3v Which frequency/duty cycle is your PWM from another circuit ? Its 50Hz to 100Hz Which board are you using ? stm32f103c8t6 Can you give us more details on your setup:
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