What makes a GPIO a general purpose PIN?
A general-purpose input/output (GPIO) is an uncommitted digital signal pin on an integrated circuit or electronic circuit board whose behavior—including whether it acts as input or output—is controllable by the user at run time.
What are the capabilities of a GPIO port?
A GPIO port is a group of GPIO pins (typically 8 GPIO pins) arranged in a group and controlled as a group. GPIO capabilities may include: GPIO pins can be configured to be input or output. GPIO pins can be enabled/disabled. Input values are readable (typically high or low)
When to use GPIOs in the RTC subsystem?
The GPIOs routed to the RTC low-power subsystem can be used when the ESP32 is in deep sleep. These RTC GPIOs can be used to wake up the ESP32 from deep sleep when the Ultra Low Power (ULP) co-processor is running. The following GPIOs can be used as an external wake up source. RTC_GPIO0 (GPIO36)
Can a GPIO be used as an ADC channel?
The ESP32 has 18 x 12 bits ADC input channels (while the ESP8266 only has 1x 10 bits ADC). These are the GPIOs that can be used as ADC and respective channels: Note: ADC2 pins cannot be used when Wi-Fi is used.
General-purpose input/output. A general-purpose input/output ( GPIO) is an uncommitted digital signal pin on an integrated circuit or electronic circuit board whose behavior—including whether it acts an input or output—is controllable by the user at run time . GPIOs have no predefined purpose and are unused by default.
How are GPIOs used in an integrated circuit?
Integrated circuit (IC) GPIOs are implemented in a variety of ways. Some ICs provide GPIOs as a primary function whereas others include GPIOs as a convenient “accessory” to some other primary function.
What does the GPIO do in a microcontroller?
The STM32 microcontroller general-purpose input/ output pin (GPIO) provides many ways to interface with external circuits within an application framework.