Conversely, when the push button is pressed, it connects the PC13 pin to ground, resulting in a logic low signal (active low) being detected on the PC13 pin. In this configuration, when the push button is not pressed, the PC13 pin receives a logic high signal (active high). In the schematic diagram, it is evident that the onboard push button is connected to the PC13 digital pin via a pull-up resistor. The push button is utilized as a digital input to control the onboard LEDs on the discovery board. The STM32 Nucleo-F103RB board features an onboard push button, which is connected to the PC13 GPIO pin. ![]() Using STM32 Nucleo-64 On Board Push Button As mentioned in the content, when using an onboard push button on the STM32 NUCLEO-F103RB board, the appropriate pull-up or pull-down configuration is already present, eliminating the need for external resistors. For interfacing a push button, either Pull-Up Mode or Pull-Down Mode can be used based on how the push button is connected to the GPIO pin. The selection of pull-up or pull-down mode depends on the specific application and circuit design. When the pin is set as an input and not externally driven high, the internal pull-down resistor pulls the pin to a logic low (GND) state. GPIO_PULLDOWN: Choosing this value activates the internal pull-down resistor for the specified GPIO pin.When the pin is set as an input and not externally driven low, the internal pull-up resistor pulls the pin to a logic high (VDD) state. GPIO_PULLUP: Selecting this value activates the internal pull-up resistor for the specified GPIO pin.It is up to the external circuitry to provide a defined voltage level to the pin. GPIO_NOPULL: This value means that no pull-up or pull-down resistors are activated, and the GPIO pin will be in a floating state when set as an input. ![]() The following values can be passed to the Pull member of the GPIO_InitTypeDef structure: The key parameter of interest in this context is the Pull parameter, which determines whether the internal pull-up or pull-down resistors are activated. #define GPIO_PULLDOWN 0x00000002U /*!< Pull-down activation */ #define GPIO_PULLUP 0x00000001U /*!< Pull-up activation */ #define GPIO_NOPULL 0x00000000U /*!< No Pull-up or Pull-down activation */ This structure allows the user to specify various parameters for GPIO pin configuration, including Pin (the specific GPIO pin to be configured), Mode (operating mode for the selected pin), Speed (the speed at which the pin operates), and Alternate (specifying the peripheral connected to the pin). In the HAL (Hardware Abstraction Layer) libraries, these internal pull-up and pull-down resistors can be configured using the GPIO_InitTypeDef C struct. These internal resistors can be activated or deactivated through the PUPDR (Pull-Up/Pull-Down) register, which is part of the GPIO configuration. STM32 microcontrollers have GPIO (General Purpose Input/Output) ports that include internal pull-up and pull-down resistors, which can be used to configure the behavior of GPIO pins when they are set as inputs. Using Internal Pull-up and Pull-down Resistors STM32 Nucleo-64 Step 5: Read the state of the GPIO pin if it reads as “low,” the push button is not pressed, and if it reads as “high,” the push button is pressed. USB VBUS or external source(3.Step 4: Configure the corresponding GPIO pin as input in the STM32 microcontroller.selection-mode switch to use the kit as a standalone ST-LINK/V2-1.On-board ST-LINK/V2-1 debugger/programmer with SWD connector. ![]() STMicroelectronics Morpho extension pin headers for full access to all STM32 I/Os.STM32 microcontroller with LQFP64 package.The STM32 Nucleo board comes with the STM32 comprehensive software HAL library together with various packaged software examples, as well as direct access to mbed online resources. The STM32 Nucleo board does not require any separate probe as it integrates the ST-LINK/V2-1 debugger/programmer. The Arduino™ connectivity support and ST Morpho headers make it easy to expand the functionality of the STM32 Nucleo open development platform with a wide choice of specialized shields. The STM32 Nucleo board provides an affordable and flexible way for users to try out new ideas and build prototypes with any STM32 microcontroller line, choosing from the various combinations of performance, power consumption and features. NUCLEO-F103RB, Development board for STM32 F1 series - with STM32F103RBT6 MCU,supports Arduino NUCLEO-F103RB Description Speech / Image Recognition / AI Cameras.
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