#Nucleo f446re i2c pins code#

A pinMode function is used for the declaration of digital pins. In Arduino IDE, the setup function is used for declaration or initialization. If you want to add a delay of one second between turning on and turning off an LED, you will use delay(1000).ĭelay(2000) // waits for two second setup() This function is used to generate delays in milliseconds. digitalWrite(PD_2, HIGH) // sets the PD_2 pin as digital highĭigitalWrite(PD_2, LOW) // sets the PD_2 pin as digital low delay(value) For example, if you write digitalWrite(PD_2, HIGH), it will make pin number PD_2 logic HIGH or 3.3 volts and if you write digitalWrite(PD_2, LOW), it will make digital output pin PD_2 LOW or you will get zero volts at the output pin. A first argument is a pin number and the second value to this function is logic state either ‘HIGH’ or ‘LOW’. This function sets or clears digital output pins if the pin has been configured as a digital output pin with pinMode() function. PinMode(PA_5, INPUT) // configure PA_5 pin as a digital output pin digitalWrite(pin_number, value) PinMode(PA_7, OUTPUT) // configure PA_7 pin as a digital output pin pinMode(PD_2, OUTPUT) // configure PD_2 pin as a digital output pin For example, if we write pinMode(22, OUTPUT), it will declare pin number 22 as a digital output pin. The second argument is either INPUT or OUTPUT. The first argument to this function is a pin number or pin name to which you want to declare either as an input or output. This function is used to configure GIPO pins mode either as an input or output. If you have already used Arduino IDE for Arduino, ESP32, or ESP8266 programming, you will be already familiar with these functions : pinMode(pin_name, pin_mode) These routines are used to configure GPIO pins.

#Nucleo f446re i2c pins code#

To write LED blinking code for STM32 Nucleo, first, we need to understand three main functions available in Arduino IDE. Program STM32 Nucleo GPIO pins with Arduino IDE The following diagrams of different connectors of Nucleo-F103RB board show various GPIO pins for UART, I2C, SPI, ADC, CAN, Timers output, and USB communication. But you can use only one functionality at a time. We can use any one of these pins as a digital input or digital output.Įach GPIO pin may have multiple functions. Various features of Nucleo-F103RB are mentioned below: Features and PeripheralsĪccording to the above table, this STM32 Nucleo board has 51 general purpose input-output pins. The Nucleo-F103RB board comes with an STM32F103RBT6 microcontroller which is ARM®32-bit Cortex®-M3 CPU. But you can use any other Nucleo board also and follow the same instructions to use GPIO pins as digital output pins. But the one which we are going to use in this tutorial is a Nucleo-F103RB board. St-flash -reset write blink.As discussed in the previous tutorial, there are many variants of STM32 Nucleo boards are available. * Get memory address of end of bss section */Ĭompile_flash.sh: arm-none-eabi-gcc -O0 -Wall -c -g -mcpu=cortex-m4 -mthumb blink.c -o blink.oĪrm-none-eabi-ld -o blink.elf -T linker.ld blink.oĪrm-none-eabi-objcopy blink.elf blink.bin -O binaryĪrm-none-eabi-nm -numeric-sort blink.elf *(COMMON) /* Uninitialized variables are placed in COMMON section for object files */ *(.bss) /* Uninitialized static and global variables */ * Get memory address of start of bss section */ bss : /* Define output file BSS section */ _data_load = LOADADDR(.data) /* Get the load memory address (LMA) for section. } >ram AT >rom /* After AT we specify the load-time location */

* Get the memory address (VMA) for end of section. *(.data) /* Initialized static and global variable values */ * Get the memory address (VMA) for start of section. data : /* Define output file DATA section */ Copy data section values from load time memory address (LMA) to their address in SRAMįor (src = &_data_load, dest = &_data_start dest rom The startup function, address was provided in the vector table (unsigned int *) startup // Address of the reset handler which is also our startup function (unsigned int *) 0x20020000, // Address of top of stack. Unsigned int * vectors _attribute_ ((section('.vectors'))) = array to be placed in a memory section that we call '.vectors' We use _attribute_ ((section('.vectors'))) to tell the compiler that we want the Below we create an array of pointers which would form our vector table Int main() // Function prototype for main function Void startup() // Function prototype (forward declaration) for startup function Here are the files (C file, Linkerscript, Bashscript for compilation and Flashing).īlink.c: // Create references to symbols defined in the linker script The plan is to set clock for GPIOA on, then set GPIOA_5 to output and then set it to high. I am trying to turn on the Internal LED on my Nucleo-F446RE, but it the LED is always off.