esp-idf/docs/en/api-reference/peripherals/gpio.rst
2021-01-26 05:51:52 +00:00

53 lines
2.0 KiB
ReStructuredText

GPIO & RTC GPIO
===============
Overview
--------
.. only:: esp32
The {IDF_TARGET_NAME} chip features 40 physical GPIO pads. Some GPIO pads cannot be used or do not have the corresponding pin on the chip package. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__]. Each pad can be used as a general purpose I/O or can be connected to an internal peripheral signal.
- Note that GPIO6-11 are usually used for SPI flash.
- GPIO34-39 can only be set as input mode and do not have software pullup or pulldown functions.
.. only:: esp32s2
The {IDF_TARGET_NAME} chip features 43 physical GPIO pads. Some GPIO pads cannot be used or do not have the corresponding pin on the chip package. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__]. Each pad can be used as a general purpose I/O or can be connected to an internal peripheral signal.
- Note that GPIO26-32 are usually used for SPI flash.
- GPIO46 is fixed to pull-down and is input only
.. only:: SOC_RTCIO_INPUT_OUTPUT_SUPPORTED
There is also separate "RTC GPIO" support, which functions when GPIOs are routed to the "RTC" low-power and analog subsystem. These pin functions can be used when:
.. list::
- In deep sleep
:SOC_ULP_SUPPORTED: - The :doc:`Ultra Low Power co-processor <../../api-guides/ulp>` is running
- Analog functions such as ADC/DAC/etc are in use.
Application Example
-------------------
GPIO output and input interrupt example: :example:`peripherals/gpio/generic_gpio`.
API Reference - Normal GPIO
---------------------------
.. include-build-file:: inc/gpio.inc
.. include-build-file:: inc/gpio_types.inc
.. only:: SOC_RTCIO_INPUT_OUTPUT_SUPPORTED
API Reference - RTC GPIO
------------------------
.. include-build-file:: inc/rtc_io.inc
.. include-build-file:: inc/rtc_io_types.inc