What does GPIO mean in a microcontroller?

What does GPIO mean in a microcontroller?

Anyone who writes software for microcontrollers will have to configure and manage general purpose input/output ( GPIO) pins. On their surface, GPIO configuration seems simple: pins are input or output, and they can be high or low.

What’s the difference between push pull GPIO and open drain GPIO?

With a push-pull GPIO, a transistor connects to VCC or GND to drive a signal high or low. When the output goes low, the signal is actively “pulled” to ground, and when the output goes high it is actively “pushed” to VCC. Unlike push-pull, an open-drain output can only sink current. The output has two states: low and high-impedance.

What does hysteresis do on GPIO input pins?

Most GPIO input pins also feature internal hysteresis, which prevents spurious state changes on the pins. Usually hysteresis is a built-in feature, rather than a configurable setting. When a GPIO is configured as an output, it can be used to drive a signal high or low.

Which is the default output setting on a GPIO?

Push-pull is the default GPIO output setting in most cases. A push-pull GPIO has the ability to both source and sink current. With a push-pull GPIO, a transistor connects to VCC or GND to drive a signal high or low. When the output goes low, the signal is actively “pulled” to ground, and when the output goes high it is actively “pushed” to VCC.

What’s the difference between high drive GPIO and push pull GPIO?

High-drive GPIO are push-pull pins that are capable of providing more current than typical pins. While you must check each chip’s datasheet to understand the current capacity of your pins, typical push-pull GPIO can source/sink around ±8mA, while a high-drive pin can source/sink up to ±40mA.

What is the output of an open drain GPIO?

Unlike push-pull, an open-drain output can only sink current. The output has two states: low and high-impedance. In order to achieve a logical high output on the line, a pull-up resistor is used to connect the open-drain output to the desired output voltage level.

What kind of pins are used in a microcontroller?

In fact, most of the pins in a typical microcontroller are GPIO pins except for some special pins. The special (non-GPIO) pins are usually the following ones: OSCillator pins: OSC1 & OSC2. Those couple of pins are used to provide the MCU with the oscillator clock input it needs. MCLR: the master clear reset pin.

What is the general purpose of GPIO pins?

The use of General Purpose Input/Outputs is a realization of open ended transmission between devices on an embedded level. These pins available on a processor can be programmed to be used to either accept input or provide output to external devices depending on user desires and applications requirements.

What’s the purpose of the STM32 GPIO tutorial?

This is the Series of tutorials on STM32 Microcontroller. The aim of this series is to provide easy and practical examples that anyone can understand. Basically, you can write GPIO codes in multiple ways (Using HAL, GPIO driver).

How does the slew rate work on a GPIO?

The drive capability and slew rate are directly referenced to capacitive and resistive loads on the pin plus the capacitive load of the GPIO pin itself , its spec’ed in data sheets, therefore switching in more drivers gives more bananas to the beat!

What is the data register on GPIO used for?

These data registers are used to make the store the data to be output/input. The below registers are used for output/input. This is the Input Data Register. When you configure the GPIO ports as input using GPIOx_MODER register, this register is used to get the value from the GPIO pin.

What are the standard input and output commands for GPIO?

Standard input and output commands gpio mode in/out/pwm/clock/up/down/tri This sets the mode of a pin to be input, output, pwm or clock mode, and additionally can set the internal pull-up/down resistors to pull-up, pull-down or none. gpio write 0/1

What is the GPIO utility for wiring Pi?

The GPIO utility WiringPi comes with a separate program to help manage the on-board GPIO interface as well as additional modules such as the PiFace and other devices like the Gertboard as well as generic GPIO expander type devices. This program, called gpio, can also be used in scripts to manipulate the GPIO pins – set outputs and read inputs.