To illustrate the initial concept in detail, let's take a look at a simple driver that we've been using since the first examples introduced in this book—an LED driver. A simplified version of an interface to drive the LEDs on our Nucleo board has been used since the very first examples in earlier chapters. This interface is located at BSP\Nucleo_F767ZI_GPIO.c/h. This code fully abstracted the LEDs from the underlying hardware with a struct named LED. The LED struct has two function pointers: On and Off. As expected, the intention of these two functions is to turn an LED on and off. The beauty of this is that the calling code doesn't need to be concerned with the implementation of the LED at all. Each LED could ...
Developing an LED interface
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