Stm32 nucleo board schematic8/30/2023 ![]() But you can also use an external push button in any one of the above configurations. #define GPIO_PULLDOWN 0x00000002U /*!< Pull-down activation */īut for the demonstration purpose, we will use the onboard push button of STM32 NUCLEO-F103RB. #define GPIO_PULLUP 0x00000001U /*!< Pull-up activation */ These values which can be passed to Pull members 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. In STM32CubeIDE, we will configure it through a GUI tool. STM32 microcontroller’s GPIO ports also have internal pull-up and pull-down resistors which can be configured through the PUPDR register. 3.Internal Pull-up and Pull-down Resistors STM32 Microcontrollers As the OP pointed out, use code of the form (1.I usually make a typedef for something like a reg32_t type in order not to forget. Otherwise the compiler may end up optimizing out your code. Get in the habit of always using the volatile keyword when accessing peripheral registers.*pPortAModeReg &= ~(0x03 BSRR = (1U<<5) //or however you want to address that register For GPIOA Pin 5 you need to manipulate bits 10 and 11. configure the mode of the IO pin as output Then you set GPIO mode as, quoting you: //2. You activate clock to GPIO Port A correctly (also, GPIOA registers would also read all 0x00 is it hadn't been activated). I ran through your code with reference manual in hand. I am suspecting that the pin PA5 is wrong, but i tried PA12 too and it does not work. Using the register viewer from the IDE, I can see that the PA5 is set as output, but physically, my led is not turning on. SET 12th bit of the output data register to make I/O pin-12 as HIGH enable the clock for GPIOA peripheral in the AHBENR I am using the following code to set/clear the registers in the board: #include The user manual states the following addresses for the clock, mode and data registers: Led pin: PA5Īddress of the Clock control register: RCC_AHBENRĪddress of the GPIOA output data register I am trying to turn the led (LD2 in schematic) inside the nucleo board on using only registers with the STM32CubeIDE.
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