In Abschnitt 5.2 bin ich bereits kurz auf die Register GPIO_AFRL (GPIO Alternate Function Register Low) und GPIO_AFRH (GPIO Alternate Function Register High) eingegangen, im Rahmen der Beschreibung der verschiedenen GPIO-Register ging es dort aber nur um eine Einführung.
Das Verständnis von GPIO_AFRL und GPIO_AFRH ist aber immens wichtig, denn nur mit ihrer Hilfe können Sie die STM32F4xx-Mikrocontroller vollständig »ausreizen«.
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