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60 lines
2.8 KiB
ReStructuredText
60 lines
2.8 KiB
ReStructuredText
GPIO & RTC GPIO
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===============
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Overview
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--------
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.. only:: esp32
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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.
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- Note that GPIO6-11 are usually used for SPI flash.
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- GPIO34-39 can only be set as input mode and do not have software pullup or pulldown functions.
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.. only:: esp32s2
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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.
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- Note that GPIO26-32 are usually used for SPI flash.
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- GPIO46 is fixed to pull-down and is input only
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.. only:: esp32c3
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The {IDF_TARGET_NAME} chip features 22 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.
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- Note that GPIO12-17 are usually used for SPI flash.
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- Note that GPIO 18 and 19 are used by USB-JTAG by default. In order to use them as GPIOs, USB-JTAG will be disabled by the drivers.
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- {IDF_TARGET_NAME} doesn't have separate "RTC GPIO" support. However, GPIO0-5 keep the rtc feature, which can be used for power-management and analog subsystem.
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.. only:: SOC_RTCIO_INPUT_OUTPUT_SUPPORTED
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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:
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.. list::
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- In deep sleep
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:SOC_ULP_SUPPORTED: - The :doc:`Ultra Low Power co-processor <../../api-guides/ulp>` is running
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- Analog functions such as ADC/DAC/etc are in use.
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Application Example
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-------------------
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GPIO output and input interrupt example: :example:`peripherals/gpio/generic_gpio`.
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API Reference - Normal GPIO
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---------------------------
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.. include-build-file:: inc/gpio.inc
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.. include-build-file:: inc/gpio_types.inc
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.. only:: SOC_RTCIO_INPUT_OUTPUT_SUPPORTED
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API Reference - RTC GPIO
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------------------------
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.. include-build-file:: inc/rtc_io.inc
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.. include-build-file:: inc/rtc_io_types.inc
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