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. You can read this guide on how to download and install keil MDK for ARM on your system: Therefore, you should have installed Keil uvision on your system. In this series of tutorials on the STM32F4 discovery board, we are using Keil uvision IDE and HAL drivers from STMicroelectronics to write programs for the STM32F4 discovery board. Toggle onboard LEDs of STM32F4 with GPIO pins.If you don’t know how to configure GPIO pins as a digital output pins, you should read that tutorial from this link: In the last tutorial, we learned to control these LEDs by configuring GPIO pins of PORTD as digital output pins. #define GPIO_PULLDOWN 0x00000002U /*!< Pull-down activation */īut for the demonstration purpose, we can use external pull-up and pull-down resistors with GPIO pins of STM32F4 discovery board. #define GPIO_PULLUP 0x00000001U /*!< Pull-up activation */ The values which can be passed to Pull member are: #define GPIO_NOPULL 0x00000000U /*!< No Pull-up or Pull-down activation */ 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. Internal Pull-up and Pull-down Resistors STM32F4 Let’s discuss both these modes one by one. There are two configuration modes to interface a push button with STM32F4 Discovery board. When a push button is pressed or unpressed, it provides either logic high and logic low output depending on the configuration mode in which the push button circuit is designed. When we want to interface a push button with a microcontroller, we actually want to read the state of the push button either is pressed or not pressed state. Push Button Interfacing with STM32F4 Discovery board In this Push button tutorial, we will control onboard LEDs of STM32F4 Discovery board with an onboard push button using Keil uvision IDE and HAL GPIO drivers. In the last tutorial, we learned to use GPIO pins as digital output pins by blinking the onboard LEDs of Discovery board. To use a push button with STM32F4, we will configure GPIO pins of STM32F407VG microcontroller as a digital input pin. In this tutorial, we will learn to interface a Push button with the STM32F4 Discovery board.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |