![]() You have to assume that all GPIO pins are not 5v tolerant by default until you find in the datasheet that a specific pin is 5v tolerant, only then you can use it as a 5v pin. It shows the diode protection, internal pull-up or down enable/disable, and also the push-pull output driver, output enable/disable for switching between input/output pin modes, Schmitt-triggered digital input, analog input. ![]() Here is a digital diagram for the internal structure of a typical GPIO pin. This way, there is no risk that an IRQ occurs between the read and modify access. The purpose of the set/reset registers is to allow atomic read/modify accesses to any of the GPIO registers. Each I/O port bit is freely programmable, however, the I/O port registers have to be accessed as 32-bit words (half-word or byte accesses are not allowed). So let’s get started!Įach of the general-purpose I/O ports has two 32-bit configuration registers, two 32-bit data registers, a 32-bit set/reset register, a 16-bit reset register, and a 32-bit locking register. We’ll get into the GPIO speed, alternative functions, locking mechanism, and different possible configurations. How it works and what sort of functionalities there are, so you can configure it in the best way to meet your applications’ needs. ![]() In this tutorial, we’ll discuss the STM32 GPIO hardware. Previous Tutorial Tutorial 3 Next Tutorial STM32 GPIO Tutorial STM32 Course Home Page □
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