5
General-Purpose Input Output (GPIO) and the STM Hardware Abstraction Layer (HAL)
As the formidable title states, this chapter deals with how GPIO operates on a STM Nucleo-64 board and how the HAL software is involved. It is important to first study the STM MCU architecture in order to fully understand how the GPIO ports function and their relationship to HAL. I would also acknowledge that many of the figures and table content are sourced from either the STM32F302R8 datasheet or reference manual. I would highly recommend that you download and have them readily available to help fill in any gaps in my discussions.
Figure 5-1 is the STM32F302R8 block diagram, which is the MCU used in the Nucleo-64 development board used in this book.
Figure ...
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