STM NUCLEOF401RE BASIC GPIO

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A basic guide to how I got an LED to blink on the ST Nucleo F401RE board without using MBED.

Step One - Install PlatformIO - the website will have the latest details about how to do this. PlatformIO is a convenient way of installing both a toolchain and the CMSIS framework I want to use.

The GPIO pins on the STMF401RET6 device are arranged into three channels A to C, each with a clock entry on the AHB1 bus.