GPIO & RTC GPIO
Overview
The ESP32-C3 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 ESP32-C3 Technical Reference Manual > IO MUX and GPIO Matrix (GPIO, IO_MUX) [PDF]. Each pad can be used as a general purpose I/O or can be connected to an internal peripheral signal.
The table below provides more information on pin usage, and please note the comments in the table for GPIOs with restrictions.
GPIO |
Analog Function |
Comment |
---|---|---|
GPIO0 |
ADC1_CH0 |
RTC |
GPIO1 |
ADC1_CH1 |
RTC |
GPIO2 |
ADC1_CH2 |
Strapping pin;RTC |
GPIO3 |
ADC1_CH3 |
RTC |
GPIO4 |
ADC1_CH4 |
RTC |
GPIO5 |
ADC2_CH0 |
RTC |
GPIO6 |
||
GPIO7 |
||
GPIO8 |
Strapping pin |
|
GPIO9 |
Strapping pin |
|
GPIO10 |
||
GPIO11 |
||
GPIO12 |
SPI0/1 |
|
GPIO13 |
SPI0/1 |
|
GPIO14 |
SPI0/1 |
|
GPIO15 |
SPI0/1 |
|
GPIO16 |
SPI0/1 |
|
GPIO17 |
SPI0/1 |
|
GPIO18 |
USB-JTAG |
|
GPIO19 |
USB-JTAG |
|
GPIO20 |
||
GPIO21 |
Note
Strapping pin: GPIO2, GPIO8 and GPIO9 are strapping pins. For more infomation, please refer to ESP32-C3 datasheet.
SPI0/1: GPIO12-17 are usually used for SPI flash and PSRAM and not recommended for other uses.
USB-JTAG: 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.
RTC: GPIO0-5 can be used when in deep sleep.
Application Example
GPIO output and input interrupt example: peripherals/gpio/generic_gpio.
API Reference - Normal GPIO
Header File
Functions
-
esp_err_t gpio_config(const gpio_config_t *pGPIOConfig)
GPIO common configuration.
Configure GPIO’s Mode,pull-up,PullDown,IntrType
- Parameters
pGPIOConfig – Pointer to GPIO configure struct
- Returns
ESP_OK success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_reset_pin(gpio_num_t gpio_num)
Reset an gpio to default state (select gpio function, enable pullup and disable input and output).
Note
This function also configures the IOMUX for this pin to the GPIO function, and disconnects any other peripheral output configured via GPIO Matrix.
- Parameters
gpio_num – GPIO number.
- Returns
Always return ESP_OK.
-
esp_err_t gpio_set_intr_type(gpio_num_t gpio_num, gpio_int_type_t intr_type)
GPIO set interrupt trigger type.
- Parameters
gpio_num – GPIO number. If you want to set the trigger type of e.g. of GPIO16, gpio_num should be GPIO_NUM_16 (16);
intr_type – Interrupt type, select from gpio_int_type_t
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_intr_enable(gpio_num_t gpio_num)
Enable GPIO module interrupt signal.
Note
ESP32: Please do not use the interrupt of GPIO36 and GPIO39 when using ADC or Wi-Fi and Bluetooth with sleep mode enabled. Please refer to the comments of
adc1_get_raw
. Please refer to Section 3.11 of ESP32 ECO and Workarounds for Bugs for the description of this issue. As a workaround, call adc_power_acquire() in the app. This will result in higher power consumption (by ~1mA), but will remove the glitches on GPIO36 and GPIO39.- Parameters
gpio_num – GPIO number. If you want to enable an interrupt on e.g. GPIO16, gpio_num should be GPIO_NUM_16 (16);
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_intr_disable(gpio_num_t gpio_num)
Disable GPIO module interrupt signal.
- Parameters
gpio_num – GPIO number. If you want to disable the interrupt of e.g. GPIO16, gpio_num should be GPIO_NUM_16 (16);
- Returns
ESP_OK success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_set_level(gpio_num_t gpio_num, uint32_t level)
GPIO set output level.
- Parameters
gpio_num – GPIO number. If you want to set the output level of e.g. GPIO16, gpio_num should be GPIO_NUM_16 (16);
level – Output level. 0: low ; 1: high
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG GPIO number error
-
int gpio_get_level(gpio_num_t gpio_num)
GPIO get input level.
Warning
If the pad is not configured for input (or input and output) the returned value is always 0.
- Parameters
gpio_num – GPIO number. If you want to get the logic level of e.g. pin GPIO16, gpio_num should be GPIO_NUM_16 (16);
- Returns
0 the GPIO input level is 0
1 the GPIO input level is 1
-
esp_err_t gpio_set_direction(gpio_num_t gpio_num, gpio_mode_t mode)
GPIO set direction.
Configure GPIO direction,such as output_only,input_only,output_and_input
- Parameters
gpio_num – Configure GPIO pins number, it should be GPIO number. If you want to set direction of e.g. GPIO16, gpio_num should be GPIO_NUM_16 (16);
mode – GPIO direction
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG GPIO error
-
esp_err_t gpio_set_pull_mode(gpio_num_t gpio_num, gpio_pull_mode_t pull)
Configure GPIO pull-up/pull-down resistors.
Note
ESP32: Only pins that support both input & output have integrated pull-up and pull-down resistors. Input-only GPIOs 34-39 do not.
- Parameters
gpio_num – GPIO number. If you want to set pull up or down mode for e.g. GPIO16, gpio_num should be GPIO_NUM_16 (16);
pull – GPIO pull up/down mode.
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG : Parameter error
-
esp_err_t gpio_wakeup_enable(gpio_num_t gpio_num, gpio_int_type_t intr_type)
Enable GPIO wake-up function.
- Parameters
gpio_num – GPIO number.
intr_type – GPIO wake-up type. Only GPIO_INTR_LOW_LEVEL or GPIO_INTR_HIGH_LEVEL can be used.
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_wakeup_disable(gpio_num_t gpio_num)
Disable GPIO wake-up function.
- Parameters
gpio_num – GPIO number
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_isr_register(void (*fn)(void*), void *arg, int intr_alloc_flags, gpio_isr_handle_t *handle)
Register GPIO interrupt handler, the handler is an ISR. The handler will be attached to the same CPU core that this function is running on.
This ISR function is called whenever any GPIO interrupt occurs. See the alternative gpio_install_isr_service() and gpio_isr_handler_add() API in order to have the driver support per-GPIO ISRs.
To disable or remove the ISR, pass the returned handle to the interrupt allocation functions.
- Parameters
fn – Interrupt handler function.
arg – Parameter for handler function
intr_alloc_flags – Flags used to allocate the interrupt. One or multiple (ORred) ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
handle – Pointer to return handle. If non-NULL, a handle for the interrupt will be returned here.
- Returns
ESP_OK Success ;
ESP_ERR_INVALID_ARG GPIO error
ESP_ERR_NOT_FOUND No free interrupt found with the specified flags
-
esp_err_t gpio_pullup_en(gpio_num_t gpio_num)
Enable pull-up on GPIO.
- Parameters
gpio_num – GPIO number
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_pullup_dis(gpio_num_t gpio_num)
Disable pull-up on GPIO.
- Parameters
gpio_num – GPIO number
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_pulldown_en(gpio_num_t gpio_num)
Enable pull-down on GPIO.
- Parameters
gpio_num – GPIO number
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_pulldown_dis(gpio_num_t gpio_num)
Disable pull-down on GPIO.
- Parameters
gpio_num – GPIO number
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_install_isr_service(int intr_alloc_flags)
Install the driver’s GPIO ISR handler service, which allows per-pin GPIO interrupt handlers.
This function is incompatible with gpio_isr_register() - if that function is used, a single global ISR is registered for all GPIO interrupts. If this function is used, the ISR service provides a global GPIO ISR and individual pin handlers are registered via the gpio_isr_handler_add() function.
- Parameters
intr_alloc_flags – Flags used to allocate the interrupt. One or multiple (ORred) ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
- Returns
ESP_OK Success
ESP_ERR_NO_MEM No memory to install this service
ESP_ERR_INVALID_STATE ISR service already installed.
ESP_ERR_NOT_FOUND No free interrupt found with the specified flags
ESP_ERR_INVALID_ARG GPIO error
-
void gpio_uninstall_isr_service(void)
Uninstall the driver’s GPIO ISR service, freeing related resources.
-
esp_err_t gpio_isr_handler_add(gpio_num_t gpio_num, gpio_isr_t isr_handler, void *args)
Add ISR handler for the corresponding GPIO pin.
Call this function after using gpio_install_isr_service() to install the driver’s GPIO ISR handler service.
The pin ISR handlers no longer need to be declared with IRAM_ATTR, unless you pass the ESP_INTR_FLAG_IRAM flag when allocating the ISR in gpio_install_isr_service().
This ISR handler will be called from an ISR. So there is a stack size limit (configurable as “ISR stack size” in menuconfig). This limit is smaller compared to a global GPIO interrupt handler due to the additional level of indirection.
- Parameters
gpio_num – GPIO number
isr_handler – ISR handler function for the corresponding GPIO number.
args – parameter for ISR handler.
- Returns
ESP_OK Success
ESP_ERR_INVALID_STATE Wrong state, the ISR service has not been initialized.
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_isr_handler_remove(gpio_num_t gpio_num)
Remove ISR handler for the corresponding GPIO pin.
- Parameters
gpio_num – GPIO number
- Returns
ESP_OK Success
ESP_ERR_INVALID_STATE Wrong state, the ISR service has not been initialized.
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_set_drive_capability(gpio_num_t gpio_num, gpio_drive_cap_t strength)
Set GPIO pad drive capability.
- Parameters
gpio_num – GPIO number, only support output GPIOs
strength – Drive capability of the pad
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_get_drive_capability(gpio_num_t gpio_num, gpio_drive_cap_t *strength)
Get GPIO pad drive capability.
- Parameters
gpio_num – GPIO number, only support output GPIOs
strength – Pointer to accept drive capability of the pad
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_hold_en(gpio_num_t gpio_num)
Enable gpio pad hold function.
When the pin is set to hold, the state is latched at that moment and will not change no matter how the internal signals change or how the IO MUX/GPIO configuration is modified (including input enable, output enable, output value, function, and drive strength values). It can be used to retain the pin state through a core reset and system reset triggered by watchdog time-out or Deep-sleep events.
The gpio pad hold function works in both input and output modes, but must be output-capable gpios. If pad hold enabled: in output mode: the output level of the pad will be force locked and can not be changed. in input mode: input read value can still reflect the changes of the input signal.
The state of the digital gpio cannot be held during Deep-sleep, and it will resume to hold at its default pin state when the chip wakes up from Deep-sleep. If the digital gpio also needs to be held during Deep-sleep,
gpio_deep_sleep_hold_en
should also be called.Power down or call
gpio_hold_dis
will disable this function.- Parameters
gpio_num – GPIO number, only support output-capable GPIOs
- Returns
ESP_OK Success
ESP_ERR_NOT_SUPPORTED Not support pad hold function
-
esp_err_t gpio_hold_dis(gpio_num_t gpio_num)
Disable gpio pad hold function.
When the chip is woken up from Deep-sleep, the gpio will be set to the default mode, so, the gpio will output the default level if this function is called. If you don’t want the level changes, the gpio should be configured to a known state before this function is called. e.g. If you hold gpio18 high during Deep-sleep, after the chip is woken up and
gpio_hold_dis
is called, gpio18 will output low level(because gpio18 is input mode by default). If you don’t want this behavior, you should configure gpio18 as output mode and set it to hight level before callinggpio_hold_dis
.- Parameters
gpio_num – GPIO number, only support output-capable GPIOs
- Returns
ESP_OK Success
ESP_ERR_NOT_SUPPORTED Not support pad hold function
-
void gpio_deep_sleep_hold_en(void)
Enable all digital gpio pads hold function during Deep-sleep.
Enabling this feature makes all digital gpio pads be at the holding state during Deep-sleep. The state of each pad holds is its active configuration (not pad’s sleep configuration!).
Note that this pad hold feature only works when the chip is in Deep-sleep mode. When the chip is in active mode, the digital gpio state can be changed freely even you have called this function.
After this API is being called, the digital gpio Deep-sleep hold feature will work during every sleep process. You should call
gpio_deep_sleep_hold_dis
to disable this feature.
-
void gpio_deep_sleep_hold_dis(void)
Disable all digital gpio pads hold function during Deep-sleep.
-
void gpio_iomux_in(uint32_t gpio_num, uint32_t signal_idx)
Set pad input to a peripheral signal through the IOMUX.
- Parameters
gpio_num – GPIO number of the pad.
signal_idx – Peripheral signal id to input. One of the
*_IN_IDX
signals insoc/gpio_sig_map.h
.
-
void gpio_iomux_out(uint8_t gpio_num, int func, bool oen_inv)
Set peripheral output to an GPIO pad through the IOMUX.
- Parameters
gpio_num – gpio_num GPIO number of the pad.
func – The function number of the peripheral pin to output pin. One of the
FUNC_X_*
of specified pin (X) insoc/io_mux_reg.h
.oen_inv – True if the output enable needs to be inverted, otherwise False.
-
esp_err_t gpio_force_hold_all(void)
Force hold all digital and rtc gpio pads.
GPIO force hold, no matter the chip in active mode or sleep modes.
This function will immediately cause all pads to latch the current values of input enable, output enable, output value, function, and drive strength values.
Warning
This function will hold flash and UART pins as well. Therefore, this function, and all code run afterwards (till calling
gpio_force_unhold_all
to disable this feature), MUST be placed in internal RAM as holding the flash pins will halt SPI flash operation, and holding the UART pins will halt any UART logging.
-
esp_err_t gpio_sleep_sel_en(gpio_num_t gpio_num)
Enable SLP_SEL to change GPIO status automantically in lightsleep.
- Parameters
gpio_num – GPIO number of the pad.
- Returns
ESP_OK Success
-
esp_err_t gpio_sleep_sel_dis(gpio_num_t gpio_num)
Disable SLP_SEL to change GPIO status automantically in lightsleep.
- Parameters
gpio_num – GPIO number of the pad.
- Returns
ESP_OK Success
-
esp_err_t gpio_sleep_set_direction(gpio_num_t gpio_num, gpio_mode_t mode)
GPIO set direction at sleep.
Configure GPIO direction,such as output_only,input_only,output_and_input
- Parameters
gpio_num – Configure GPIO pins number, it should be GPIO number. If you want to set direction of e.g. GPIO16, gpio_num should be GPIO_NUM_16 (16);
mode – GPIO direction
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG GPIO error
-
esp_err_t gpio_sleep_set_pull_mode(gpio_num_t gpio_num, gpio_pull_mode_t pull)
Configure GPIO pull-up/pull-down resistors at sleep.
Note
ESP32: Only pins that support both input & output have integrated pull-up and pull-down resistors. Input-only GPIOs 34-39 do not.
- Parameters
gpio_num – GPIO number. If you want to set pull up or down mode for e.g. GPIO16, gpio_num should be GPIO_NUM_16 (16);
pull – GPIO pull up/down mode.
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG : Parameter error
-
esp_err_t gpio_deep_sleep_wakeup_enable(gpio_num_t gpio_num, gpio_int_type_t intr_type)
Enable GPIO deep-sleep wake-up function.
Note
Called by the SDK. User shouldn’t call this directly in the APP.
- Parameters
gpio_num – GPIO number.
intr_type – GPIO wake-up type. Only GPIO_INTR_LOW_LEVEL or GPIO_INTR_HIGH_LEVEL can be used.
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
-
esp_err_t gpio_deep_sleep_wakeup_disable(gpio_num_t gpio_num)
Disable GPIO deep-sleep wake-up function.
- Parameters
gpio_num – GPIO number
- Returns
ESP_OK Success
ESP_ERR_INVALID_ARG Parameter error
Macros
-
GPIO_PIN_COUNT
-
GPIO_IS_VALID_GPIO(gpio_num)
Check whether it is a valid GPIO number.
-
GPIO_IS_VALID_OUTPUT_GPIO(gpio_num)
Check whether it can be a valid GPIO number of output mode.
-
GPIO_IS_VALID_DIGITAL_IO_PAD(gpio_num)
Check whether it can be a valid digital I/O pad.
-
GPIO_IS_DEEP_SLEEP_WAKEUP_VALID_GPIO(gpio_num)
Type Definitions
-
typedef intr_handle_t gpio_isr_handle_t
Header File
Structures
-
struct gpio_config_t
Configuration parameters of GPIO pad for gpio_config function.
Public Members
-
uint64_t pin_bit_mask
GPIO pin: set with bit mask, each bit maps to a GPIO
-
gpio_mode_t mode
GPIO mode: set input/output mode
-
gpio_pullup_t pull_up_en
GPIO pull-up
-
gpio_pulldown_t pull_down_en
GPIO pull-down
-
gpio_int_type_t intr_type
GPIO interrupt type
-
uint64_t pin_bit_mask
Macros
-
GPIO_SEL_0
Pin 0 selected
-
GPIO_SEL_1
Pin 1 selected
-
GPIO_SEL_2
Pin 2 selected
-
GPIO_SEL_3
Pin 3 selected
-
GPIO_SEL_4
Pin 4 selected
-
GPIO_SEL_5
Pin 5 selected
-
GPIO_SEL_6
Pin 6 selected
-
GPIO_SEL_7
Pin 7 selected
-
GPIO_SEL_8
Pin 8 selected
-
GPIO_SEL_9
Pin 9 selected
-
GPIO_SEL_10
Pin 10 selected
-
GPIO_SEL_11
Pin 11 selected
-
GPIO_SEL_12
Pin 12 selected
-
GPIO_SEL_13
Pin 13 selected
-
GPIO_SEL_14
Pin 14 selected
-
GPIO_SEL_15
Pin 15 selected
-
GPIO_SEL_16
Pin 16 selected
-
GPIO_SEL_17
Pin 17 selected
-
GPIO_SEL_18
Pin 18 selected
-
GPIO_SEL_19
Pin 19 selected
-
GPIO_SEL_20
Pin 20 selected
-
GPIO_SEL_21
Pin 21 selected
-
GPIO_SEL_26
Pin 26 selected
-
GPIO_SEL_27
Pin 27 selected
-
GPIO_SEL_28
Pin 28 selected
-
GPIO_SEL_29
Pin 29 selected
-
GPIO_SEL_30
Pin 30 selected
-
GPIO_SEL_31
Pin 31 selected
-
GPIO_SEL_32
Pin 32 selected
-
GPIO_SEL_33
Pin 33 selected
-
GPIO_SEL_34
Pin 34 selected
-
GPIO_SEL_35
Pin 35 selected
-
GPIO_SEL_36
Pin 36 selected
-
GPIO_SEL_37
Pin 37 selected
-
GPIO_SEL_38
Pin 38 selected
-
GPIO_SEL_39
Pin 39 selected
-
GPIO_PIN_REG_0
-
GPIO_PIN_REG_1
-
GPIO_PIN_REG_2
-
GPIO_PIN_REG_3
-
GPIO_PIN_REG_4
-
GPIO_PIN_REG_5
-
GPIO_PIN_REG_6
-
GPIO_PIN_REG_7
-
GPIO_PIN_REG_8
-
GPIO_PIN_REG_9
-
GPIO_PIN_REG_10
-
GPIO_PIN_REG_11
-
GPIO_PIN_REG_12
-
GPIO_PIN_REG_13
-
GPIO_PIN_REG_14
-
GPIO_PIN_REG_15
-
GPIO_PIN_REG_16
-
GPIO_PIN_REG_17
-
GPIO_PIN_REG_18
-
GPIO_PIN_REG_19
-
GPIO_PIN_REG_20
-
GPIO_PIN_REG_21
-
GPIO_PIN_REG_22
-
GPIO_PIN_REG_23
-
GPIO_PIN_REG_24
-
GPIO_PIN_REG_25
-
GPIO_PIN_REG_26
-
GPIO_PIN_REG_27
-
GPIO_PIN_REG_28
-
GPIO_PIN_REG_29
-
GPIO_PIN_REG_30
-
GPIO_PIN_REG_31
-
GPIO_PIN_REG_32
-
GPIO_PIN_REG_33
-
GPIO_PIN_REG_34
-
GPIO_PIN_REG_35
-
GPIO_PIN_REG_36
-
GPIO_PIN_REG_37
-
GPIO_PIN_REG_38
-
GPIO_PIN_REG_39
-
GPIO_PIN_REG_40
-
GPIO_PIN_REG_41
-
GPIO_PIN_REG_42
-
GPIO_PIN_REG_43
-
GPIO_PIN_REG_44
-
GPIO_PIN_REG_45
-
GPIO_PIN_REG_46
-
GPIO_PIN_REG_47
-
GPIO_PIN_REG_48
Enumerations
-
enum gpio_num_t
Values:
-
enumerator GPIO_NUM_NC
Use to signal not connected to S/W
-
enumerator GPIO_NUM_0
GPIO0, input and output
-
enumerator GPIO_NUM_1
GPIO1, input and output
-
enumerator GPIO_NUM_2
GPIO2, input and output
-
enumerator GPIO_NUM_3
GPIO3, input and output
-
enumerator GPIO_NUM_4
GPIO4, input and output
-
enumerator GPIO_NUM_5
GPIO5, input and output
-
enumerator GPIO_NUM_6
GPIO6, input and output
-
enumerator GPIO_NUM_7
GPIO7, input and output
-
enumerator GPIO_NUM_8
GPIO8, input and output
-
enumerator GPIO_NUM_9
GPIO9, input and output
-
enumerator GPIO_NUM_10
GPIO10, input and output
-
enumerator GPIO_NUM_11
GPIO11, input and output
-
enumerator GPIO_NUM_12
GPIO12, input and output
-
enumerator GPIO_NUM_13
GPIO13, input and output
-
enumerator GPIO_NUM_14
GPIO14, input and output
-
enumerator GPIO_NUM_15
GPIO15, input and output
-
enumerator GPIO_NUM_16
GPIO16, input and output
-
enumerator GPIO_NUM_17
GPIO17, input and output
-
enumerator GPIO_NUM_18
GPIO18, input and output
-
enumerator GPIO_NUM_19
GPIO19, input and output
-
enumerator GPIO_NUM_20
GPIO20, input and output
-
enumerator GPIO_NUM_21
GPIO21, input and output
-
enumerator GPIO_NUM_MAX
-
enumerator GPIO_NUM_NC
-
enum gpio_int_type_t
Values:
-
enumerator GPIO_INTR_DISABLE
Disable GPIO interrupt
-
enumerator GPIO_INTR_POSEDGE
GPIO interrupt type : rising edge
-
enumerator GPIO_INTR_NEGEDGE
GPIO interrupt type : falling edge
-
enumerator GPIO_INTR_ANYEDGE
GPIO interrupt type : both rising and falling edge
-
enumerator GPIO_INTR_LOW_LEVEL
GPIO interrupt type : input low level trigger
-
enumerator GPIO_INTR_HIGH_LEVEL
GPIO interrupt type : input high level trigger
-
enumerator GPIO_INTR_MAX
-
enumerator GPIO_INTR_DISABLE
-
enum gpio_mode_t
Values:
-
enumerator GPIO_MODE_DISABLE
GPIO mode : disable input and output
-
enumerator GPIO_MODE_INPUT
GPIO mode : input only
-
enumerator GPIO_MODE_OUTPUT
GPIO mode : output only mode
-
enumerator GPIO_MODE_OUTPUT_OD
GPIO mode : output only with open-drain mode
-
enumerator GPIO_MODE_INPUT_OUTPUT_OD
GPIO mode : output and input with open-drain mode
-
enumerator GPIO_MODE_INPUT_OUTPUT
GPIO mode : output and input mode
-
enumerator GPIO_MODE_DISABLE
-
enum gpio_pullup_t
Values:
-
enumerator GPIO_PULLUP_DISABLE
Disable GPIO pull-up resistor
-
enumerator GPIO_PULLUP_ENABLE
Enable GPIO pull-up resistor
-
enumerator GPIO_PULLUP_DISABLE
-
enum gpio_pulldown_t
Values:
-
enumerator GPIO_PULLDOWN_DISABLE
Disable GPIO pull-down resistor
-
enumerator GPIO_PULLDOWN_ENABLE
Enable GPIO pull-down resistor
-
enumerator GPIO_PULLDOWN_DISABLE
-
enum gpio_pull_mode_t
Values:
-
enumerator GPIO_PULLUP_ONLY
Pad pull up
-
enumerator GPIO_PULLDOWN_ONLY
Pad pull down
-
enumerator GPIO_PULLUP_PULLDOWN
Pad pull up + pull down
-
enumerator GPIO_FLOATING
Pad floating
-
enumerator GPIO_PULLUP_ONLY
-
enum gpio_drive_cap_t
Values:
-
enumerator GPIO_DRIVE_CAP_0
Pad drive capability: weak
-
enumerator GPIO_DRIVE_CAP_1
Pad drive capability: stronger
-
enumerator GPIO_DRIVE_CAP_2
Pad drive capability: medium
-
enumerator GPIO_DRIVE_CAP_DEFAULT
Pad drive capability: medium
-
enumerator GPIO_DRIVE_CAP_3
Pad drive capability: strongest
-
enumerator GPIO_DRIVE_CAP_MAX
-
enumerator GPIO_DRIVE_CAP_0