First: pinoutĪ complex yet flexible MCU like the STM32 provides I/Os that have "overloaded" functionalities.This means that, before we can use a peripheral (in our case, the USART), we need to configure the peripherals associated to corresponding pins. I'll assume the Nucleo-F401RE model, but it should be really easy to rearrange instructions to properly use your specific Nucleo. ST provides the full hardware project of the STM32 Nucleo (the board is designed using the Altium Designer CAD, a professional CAD used in the electronics industry, but you are not required to have a so expensive piece of software to use your Nucleo). But, before we start coding, it could be really useful take a look to the hardware.
NUCLEO F401RE PINOUT HOW TO
In this post I'll show you how to properly configure and use the integrated virtual COM port of STM32 Nucleo board. The serial port is mostly useful for two reasons: if you want to debug your firmware printing messages (not strictly necessary with the ARM architecture, since we can also use ARM semihosting) or if you want to exchange commands and messages between your Nucleo board and your PC (perhaps, using a dedicated application you are building).
Usually, this device is named something similar to tty.usbmodemXXXX, as shown below. If you use a Linux PC or a Mac, you'll find a new terminal in the /dev directory. When you install the ST-Link drivers, a new device appears in your hardware devices list: the ST-Link Virtual COM port. But, it provides at least another really useful feature: a Virtual COM port. ST Link is mainly designed to allow flashing of target MCU trough the mini-USB interface. As we have seen in the previous tutorial about this new developing board from ST, the STM32 Nucleo provides an integrated ST Link v2.1 interface.
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