Typedefs
typedef void(*	gpio_irq_callback_t) (uint gpio, uint32_t event_mask)

Enumerations
enum	gpio_function { GPIO_FUNC_XIP = 0 , GPIO_FUNC_SPI = 1 , GPIO_FUNC_UART = 2 , GPIO_FUNC_I2C = 3 , GPIO_FUNC_PWM = 4 , GPIO_FUNC_SIO = 5 , GPIO_FUNC_PIO0 = 6 , GPIO_FUNC_PIO1 = 7 , GPIO_FUNC_GPCK = 8 , GPIO_FUNC_USB = 9 , GPIO_FUNC_NULL = 0x1f }
	GPIO function definitions for use with function select. More...

enum	gpio_irq_level { GPIO_IRQ_LEVEL_LOW = 0x1u , GPIO_IRQ_LEVEL_HIGH = 0x2u , GPIO_IRQ_EDGE_FALL = 0x4u , GPIO_IRQ_EDGE_RISE = 0x8u }
	GPIO Interrupt level definitions (GPIO events) More...

enum	gpio_slew_rate { GPIO_SLEW_RATE_SLOW = 0 , GPIO_SLEW_RATE_FAST = 1 }
	Slew rate limiting levels for GPIO outputs. More...

enum	gpio_drive_strength { GPIO_DRIVE_STRENGTH_2MA = 0 , GPIO_DRIVE_STRENGTH_4MA = 1 , GPIO_DRIVE_STRENGTH_8MA = 2 , GPIO_DRIVE_STRENGTH_12MA = 3 }
	Drive strength levels for GPIO outputs. More...

Functions
void	gpio_set_function (uint gpio, enum gpio_function fn)
	Select GPIO function. More...

enum gpio_function	gpio_get_function (uint gpio)
	Determine current GPIO function. More...

void	gpio_set_pulls (uint gpio, bool up, bool down)
	Select up and down pulls on specific GPIO. More...

static void	gpio_pull_up (uint gpio)
	Set specified GPIO to be pulled up. More...

static bool	gpio_is_pulled_up (uint gpio)
	Determine if the specified GPIO is pulled up. More...

static void	gpio_pull_down (uint gpio)
	Set specified GPIO to be pulled down. More...

static bool	gpio_is_pulled_down (uint gpio)
	Determine if the specified GPIO is pulled down. More...

static void	gpio_disable_pulls (uint gpio)
	Disable pulls on specified GPIO. More...

void	gpio_set_irqover (uint gpio, uint value)
	Set GPIO IRQ override. More...

void	gpio_set_outover (uint gpio, uint value)
	Set GPIO output override. More...

void	gpio_set_inover (uint gpio, uint value)
	Select GPIO input override. More...

void	gpio_set_oeover (uint gpio, uint value)
	Select GPIO output enable override. More...

void	gpio_set_input_enabled (uint gpio, bool enabled)
	Enable GPIO input. More...

void	gpio_set_input_hysteresis_enabled (uint gpio, bool enabled)
	Enable/disable GPIO input hysteresis (Schmitt trigger) More...

bool	gpio_is_input_hysteresis_enabled (uint gpio)
	Determine whether input hysteresis is enabled on a specified GPIO. More...

void	gpio_set_slew_rate (uint gpio, enum gpio_slew_rate slew)
	Set slew rate for a specified GPIO. More...

enum gpio_slew_rate	gpio_get_slew_rate (uint gpio)
	Determine current slew rate for a specified GPIO. More...

void	gpio_set_drive_strength (uint gpio, enum gpio_drive_strength drive)
	Set drive strength for a specified GPIO. More...

enum gpio_drive_strength	gpio_get_drive_strength (uint gpio)
	Determine current slew rate for a specified GPIO. More...

void	gpio_set_irq_enabled (uint gpio, uint32_t event_mask, bool enabled)
	Enable or disable specific interrupt events for specified GPIO. More...

void	gpio_set_irq_callback (gpio_irq_callback_t callback)
	Set the generic callback used for GPIO IRQ events for the current core. More...

void	gpio_set_irq_enabled_with_callback (uint gpio, uint32_t event_mask, bool enabled, gpio_irq_callback_t callback)
	Convenience function which performs multiple GPIO IRQ related initializations. More...

void	gpio_set_dormant_irq_enabled (uint gpio, uint32_t event_mask, bool enabled)
	Enable dormant wake up interrupt for specified GPIO and events. More...

static uint32_t	gpio_get_irq_event_mask (uint gpio)
	Return the current interrupt status (pending events) for the given GPIO. More...

void	gpio_acknowledge_irq (uint gpio, uint32_t event_mask)
	Acknowledge a GPIO interrupt for the specified events on the calling core. More...

void	gpio_add_raw_irq_handler_with_order_priority_masked (uint gpio_mask, irq_handler_t handler, uint8_t order_priority)
	Adds a raw GPIO IRQ handler for the specified GPIOs on the current core. More...

static void	gpio_add_raw_irq_handler_with_order_priority (uint gpio, irq_handler_t handler, uint8_t order_priority)
	Adds a raw GPIO IRQ handler for a specific GPIO on the current core. More...

void	gpio_add_raw_irq_handler_masked (uint gpio_mask, irq_handler_t handler)
	Adds a raw GPIO IRQ handler for the specified GPIOs on the current core. More...

static void	gpio_add_raw_irq_handler (uint gpio, irq_handler_t handler)
	Adds a raw GPIO IRQ handler for a specific GPIO on the current core. More...

void	gpio_remove_raw_irq_handler_masked (uint gpio_mask, irq_handler_t handler)
	Removes a raw GPIO IRQ handler for the specified GPIOs on the current core. More...

static void	gpio_remove_raw_irq_handler (uint gpio, irq_handler_t handler)
	Removes a raw GPIO IRQ handler for the specified GPIO on the current core. More...

void	gpio_init (uint gpio)
	Initialise a GPIO for (enabled I/O and set func to GPIO_FUNC_SIO) More...

void	gpio_deinit (uint gpio)
	Resets a GPIO back to the NULL function, i.e. disables it. More...

void	gpio_init_mask (uint gpio_mask)
	Initialise multiple GPIOs (enabled I/O and set func to GPIO_FUNC_SIO) More...

static bool	gpio_get (uint gpio)
	Get state of a single specified GPIO. More...

static uint32_t	gpio_get_all (void)
	Get raw value of all GPIOs. More...

static void	gpio_set_mask (uint32_t mask)
	Drive high every GPIO appearing in mask. More...

static void	gpio_clr_mask (uint32_t mask)
	Drive low every GPIO appearing in mask. More...

static void	gpio_xor_mask (uint32_t mask)
	Toggle every GPIO appearing in mask. More...

static void	gpio_put_masked (uint32_t mask, uint32_t value)
	Drive GPIO high/low depending on parameters. More...

static void	gpio_put_all (uint32_t value)
	Drive all pins simultaneously. More...

static void	gpio_put (uint gpio, bool value)
	Drive a single GPIO high/low. More...

static bool	gpio_get_out_level (uint gpio)
	Determine whether a GPIO is currently driven high or low. More...

static void	gpio_set_dir_out_masked (uint32_t mask)
	Set a number of GPIOs to output. More...

static void	gpio_set_dir_in_masked (uint32_t mask)
	Set a number of GPIOs to input. More...

static void	gpio_set_dir_masked (uint32_t mask, uint32_t value)
	Set multiple GPIO directions. More...

static void	gpio_set_dir_all_bits (uint32_t values)
	Set direction of all pins simultaneously. More...

static void	gpio_set_dir (uint gpio, bool out)
	Set a single GPIO direction. More...

static bool	gpio_is_dir_out (uint gpio)
	Check if a specific GPIO direction is OUT. More...

static uint	gpio_get_dir (uint gpio)
	Get a specific GPIO direction. More...

Detailed Description

General Purpose Input/Output (GPIO) API

RP2040 has 36 multi-functional General Purpose Input / Output (GPIO) pins, divided into two banks. In a typical use case, the pins in the QSPI bank (QSPI_SS, QSPI_SCLK and QSPI_SD0 to QSPI_SD3) are used to execute code from an external flash device, leaving the User bank (GPIO0 to GPIO29) for the programmer to use. All GPIOs support digital input and output, but GPIO26 to GPIO29 can also be used as inputs to the chip’s Analogue to Digital Converter (ADC). Each GPIO can be controlled directly by software running on the processors, or by a number of other functional blocks.

The function allocated to each GPIO is selected by calling the gpio_set_function function.

Note: Not all functions are available on all pins.

Each GPIO can have one function selected at a time. Likewise, each peripheral input (e.g. UART0 RX) should only be selected on one GPIO at a time. If the same peripheral input is connected to multiple GPIOs, the peripheral sees the logical OR of these GPIO inputs. Please refer to the datasheet for more information on GPIO function select.

Function Select Table

GPIO	F1	F2	F3	F4	F5	F6	F7	F8	F9
0	SPI0 RX	UART0 TX	I2C0 SDA	PWM0 A	SIO	PIO0	PIO1		USB OVCUR DET
1	SPI0 CSn	UART0 RX	I2C0 SCL	PWM0 B	SIO	PIO0	PIO1		USB VBUS DET
2	SPI0 SCK	UART0 CTS	I2C1 SDA	PWM1 A	SIO	PIO0	PIO1		USB VBUS EN
3	SPI0 TX	UART0 RTS	I2C1 SCL	PWM1 B	SIO	PIO0	PIO1		USB OVCUR DET
4	SPI0 RX	UART1 TX	I2C0 SDA	PWM2 A	SIO	PIO0	PIO1		USB VBUS DET
5	SPI0 CSn	UART1 RX	I2C0 SCL	PWM2 B	SIO	PIO0	PIO1		USB VBUS EN
6	SPI0 SCK	UART1 CTS	I2C1 SDA	PWM3 A	SIO	PIO0	PIO1		USB OVCUR DET
7	SPI0 TX	UART1 RTS	I2C1 SCL	PWM3 B	SIO	PIO0	PIO1		USB VBUS DET
8	SPI1 RX	UART1 TX	I2C0 SDA	PWM4 A	SIO	PIO0	PIO1		USB VBUS EN
9	SPI1 CSn	UART1 RX	I2C0 SCL	PWM4 B	SIO	PIO0	PIO1		USB OVCUR DET
10	SPI1 SCK	UART1 CTS	I2C1 SDA	PWM5 A	SIO	PIO0	PIO1		USB VBUS DET
11	SPI1 TX	UART1 RTS	I2C1 SCL	PWM5 B	SIO	PIO0	PIO1		USB VBUS EN
12	SPI1 RX	UART0 TX	I2C0 SDA	PWM6 A	SIO	PIO0	PIO1		USB OVCUR DET
13	SPI1 CSn	UART0 RX	I2C0 SCL	PWM6 B	SIO	PIO0	PIO1		USB VBUS DET
14	SPI1 SCK	UART0 CTS	I2C1 SDA	PWM7 A	SIO	PIO0	PIO1		USB VBUS EN
15	SPI1 TX	UART0 RTS	I2C1 SCL	PWM7 B	SIO	PIO0	PIO1		USB OVCUR DET
16	SPI0 RX	UART0 TX	I2C0 SDA	PWM0 A	SIO	PIO0	PIO1		USB VBUS DET
17	SPI0 CSn	UART0 RX	I2C0 SCL	PWM0 B	SIO	PIO0	PIO1		USB VBUS EN
18	SPI0 SCK	UART0 CTS	I2C1 SDA	PWM1 A	SIO	PIO0	PIO1		USB OVCUR DET
19	SPI0 TX	UART0 RTS	I2C1 SCL	PWM1 B	SIO	PIO0	PIO1		USB VBUS DET
20	SPI0 RX	UART1 TX	I2C0 SDA	PWM2 A	SIO	PIO0	PIO1	CLOCK GPIN0	USB VBUS EN
21	SPI0 CSn	UART1 RX	I2C0 SCL	PWM2 B	SIO	PIO0	PIO1	CLOCK GPOUT0	USB OVCUR DET
22	SPI0 SCK	UART1 CTS	I2C1 SDA	PWM3 A	SIO	PIO0	PIO1	CLOCK GPIN1	USB VBUS DET
23	SPI0 TX	UART1 RTS	I2C1 SCL	PWM3 B	SIO	PIO0	PIO1	CLOCK GPOUT1	USB VBUS EN
24	SPI1 RX	UART1 TX	I2C0 SDA	PWM4 A	SIO	PIO0	PIO1	CLOCK GPOUT2	USB OVCUR DET
25	SPI1 CSn	UART1 RX	I2C0 SCL	PWM4 B	SIO	PIO0	PIO1	CLOCK GPOUT3	USB VBUS DET
26	SPI1 SCK	UART1 CTS	I2C1 SDA	PWM5 A	SIO	PIO0	PIO1		USB VBUS EN
27	SPI1 TX	UART1 RTS	I2C1 SCL	PWM5 B	SIO	PIO0	PIO1		USB OVCUR DET
28	SPI1 RX	UART0 TX	I2C0 SDA	PWM6 A	SIO	PIO0	PIO1		USB VBUS DET
29	SPI1 CSn	UART0 RX	I2C0 SCL	PWM6 B	SIO	PIO0	PIO1		USB VBUS EN

Typedef Documentation

◆ gpio_irq_callback_t

typedef void(* gpio_irq_callback_t) (uint gpio, uint32_t event_mask)

Callback function type for GPIO events

Parameters

gpio	Which GPIO caused this interrupt
event_mask	Which events caused this interrupt. See gpio_irq_level for details.

See also: gpio_set_irq_enabled_with_callback(); gpio_set_irq_callback()

Enumeration Type Documentation

◆ gpio_drive_strength

enum gpio_drive_strength

Drive strength levels for GPIO outputs.

See also: gpio_set_drive_strength

Enumerator
GPIO_DRIVE_STRENGTH_2MA	2 mA nominal drive strength
GPIO_DRIVE_STRENGTH_4MA	4 mA nominal drive strength
GPIO_DRIVE_STRENGTH_8MA	8 mA nominal drive strength
GPIO_DRIVE_STRENGTH_12MA	12 mA nominal drive strength

◆ gpio_function

enum gpio_function

GPIO function definitions for use with function select.

GPIO function selectors

Each GPIO can have one function selected at a time. Likewise, each peripheral input (e.g. UART0 RX) should only be selected on one GPIO at a time. If the same peripheral input is connected to multiple GPIOs, the peripheral sees the logical OR of these GPIO inputs.

Please refer to the datsheet for more information on GPIO function selection.

◆ gpio_irq_level

enum gpio_irq_level

GPIO Interrupt level definitions (GPIO events)

GPIO Interrupt levels

An interrupt can be generated for every GPIO pin in 4 scenarios:

Level High: the GPIO pin is a logical 1
Level Low: the GPIO pin is a logical 0
Edge High: the GPIO has transitioned from a logical 0 to a logical 1
Edge Low: the GPIO has transitioned from a logical 1 to a logical 0

The level interrupts are not latched. This means that if the pin is a logical 1 and the level high interrupt is active, it will become inactive as soon as the pin changes to a logical 0. The edge interrupts are stored in the INTR register and can be cleared by writing to the INTR register.

◆ gpio_slew_rate

enum gpio_slew_rate

Slew rate limiting levels for GPIO outputs.

Slew rate limiting increases the minimum rise/fall time when a GPIO output is lightly loaded, which can help to reduce electromagnetic emissions.

See also: gpio_set_slew_rate

Enumerator
GPIO_SLEW_RATE_SLOW	Slew rate limiting enabled.
GPIO_SLEW_RATE_FAST	Slew rate limiting disabled.

Function Documentation

◆ gpio_acknowledge_irq()

void gpio_acknowledge_irq	(	uint	gpio,
		uint32_t	event_mask
	)

Acknowledge a GPIO interrupt for the specified events on the calling core.

Note: This may be called with a mask of any of valid bits specified in gpio_irq_level, however it has no effect on level sensitive interrupts which remain pending while the GPIO is at the specified level. When handling level sensitive interrupts, you should generally disable the interrupt (see gpio_set_irq_enabled) and then set it up again later once the GPIO level has changed (or to catch the opposite level).

Parameters

gpio	GPIO number
events	Bitmask of events to clear. See gpio_set_irq_enabled for details.

Note: For callbacks set with gpio_set_irq_enabled_with_callback, or gpio_set_irq_callback,this function is called automatically.

Parameters

event_mask Bitmask of events to clear. See gpio_irq_level for details.

◆ gpio_add_raw_irq_handler()

static void gpio_add_raw_irq_handler	(	uint	gpio,
		irq_handler_t	handler
	)

inlinestatic

Adds a raw GPIO IRQ handler for a specific GPIO on the current core.

In addition to the default mechanism of a single GPIO IRQ event callback per core (see gpio_set_irq_callback), it is possible to add explicit GPIO IRQ handlers which are called independent of the default event callback.

This method adds such a callback, and disables the "default" callback for the specified GPIO.

Note: Multiple raw handlers should not be added for the same GPIO, and this method will assert if you attempt to.

A raw handler should check for whichever GPIOs and events it handles, and acknowledge them itself; it might look something like:

void my_irq_handler(void) {
    if (gpio_get_irq_event_mask(my_gpio_num) & my_gpio_event_mask) {
       gpio_acknowledge_irq(my_gpio_num, my_gpio_event_mask);
      // handle the IRQ
    }
}

Parameters

gpio	the GPIO number that will no longer be passed to the default callback for this core
handler	the handler to add to the list of GPIO IRQ handlers for this core

◆ gpio_add_raw_irq_handler_masked()

void gpio_add_raw_irq_handler_masked	(	uint	gpio_mask,
		irq_handler_t	handler
	)

Adds a raw GPIO IRQ handler for the specified GPIOs on the current core.

In addition to the default mechanism of a single GPIO IRQ event callback per core (see gpio_set_irq_callback), it is possible to add explicit GPIO IRQ handlers which are called independent of the default event callback.

This method adds such a callback, and disables the "default" callback for the specified GPIOs.

Note: Multiple raw handlers should not be added for the same GPIOs, and this method will assert if you attempt to.

A raw handler should check for whichever GPIOs and events it handles, and acknowledge them itself; it might look something like:

void my_irq_handler(void) {
    if (gpio_get_irq_event_mask(my_gpio_num) & my_gpio_event_mask) {
       gpio_acknowledge_irq(my_gpio_num, my_gpio_event_mask);
      // handle the IRQ
    }
    if (gpio_get_irq_event_mask(my_gpio_num2) & my_gpio_event_mask2) {
       gpio_acknowledge_irq(my_gpio_num2, my_gpio_event_mask2);
      // handle the IRQ
    }
}

Parameters

gpio_mask	a bit mask of the GPIO numbers that will no longer be passed to the default callback for this core
handler	the handler to add to the list of GPIO IRQ handlers for this core

◆ gpio_add_raw_irq_handler_with_order_priority()

static void gpio_add_raw_irq_handler_with_order_priority	(	uint	gpio,
		irq_handler_t	handler,
		uint8_t	order_priority
	)

inlinestatic

Adds a raw GPIO IRQ handler for a specific GPIO on the current core.

In addition to the default mechanism of a single GPIO IRQ event callback per core (see gpio_set_irq_callback), it is possible to add explicit GPIO IRQ handlers which are called independent of the default callback. The order relative to the default callback can be controlled via the order_priority parameter(the default callback has the priority GPIO_IRQ_CALLBACK_ORDER_PRIORITY which defaults to the lowest priority with the intention of it running last).

This method adds such a callback, and disables the "default" callback for the specified GPIO.

Note: Multiple raw handlers should not be added for the same GPIO, and this method will assert if you attempt to.

A raw handler should check for whichever GPIOs and events it handles, and acknowledge them itself; it might look something like:

void my_irq_handler(void) {
    if (gpio_get_irq_event_mask(my_gpio_num) & my_gpio_event_mask) {
       gpio_acknowledge_irq(my_gpio_num, my_gpio_event_mask);
      // handle the IRQ
    }
}

Parameters

gpio	the GPIO number that will no longer be passed to the default callback for this core
handler	the handler to add to the list of GPIO IRQ handlers for this core
order_priority	the priority order to determine the relative position of the handler in the list of GPIO IRQ handlers for this core.

◆ gpio_add_raw_irq_handler_with_order_priority_masked()

void gpio_add_raw_irq_handler_with_order_priority_masked	(	uint	gpio_mask,
		irq_handler_t	handler,
		uint8_t	order_priority
	)

Adds a raw GPIO IRQ handler for the specified GPIOs on the current core.

In addition to the default mechanism of a single GPIO IRQ event callback per core (see gpio_set_irq_callback), it is possible to add explicit GPIO IRQ handlers which are called independent of the default callback. The order relative to the default callback can be controlled via the order_priority parameter (the default callback has the priority GPIO_IRQ_CALLBACK_ORDER_PRIORITY which defaults to the lowest priority with the intention of it running last).

This method adds such an explicit GPIO IRQ handler, and disables the "default" callback for the specified GPIOs.

Note: Multiple raw handlers should not be added for the same GPIOs, and this method will assert if you attempt to.

A raw handler should check for whichever GPIOs and events it handles, and acknowledge them itself; it might look something like:

void my_irq_handler(void) {
    if (gpio_get_irq_event_mask(my_gpio_num) & my_gpio_event_mask) {
       gpio_acknowledge_irq(my_gpio_num, my_gpio_event_mask);
      // handle the IRQ
    }
    if (gpio_get_irq_event_mask(my_gpio_num2) & my_gpio_event_mask2) {
       gpio_acknowledge_irq(my_gpio_num2, my_gpio_event_mask2);
      // handle the IRQ
    }
}

Parameters

gpio_mask	a bit mask of the GPIO numbers that will no longer be passed to the default callback for this core
handler	the handler to add to the list of GPIO IRQ handlers for this core
order_priority	the priority order to determine the relative position of the handler in the list of GPIO IRQ handlers for this core.

◆ gpio_clr_mask()

static void gpio_clr_mask ( uint32_t mask )

inlinestatic

Drive low every GPIO appearing in mask.

Parameters

mask	Bitmask of GPIO values to clear, as bits 0-29

◆ gpio_deinit()

void gpio_deinit ( uint gpio )

Resets a GPIO back to the NULL function, i.e. disables it.

Parameters

gpio	GPIO number

◆ gpio_disable_pulls()

static void gpio_disable_pulls ( uint gpio )

inlinestatic

Disable pulls on specified GPIO.

Parameters

gpio	GPIO number

◆ gpio_get()

static bool gpio_get ( uint gpio )

inlinestatic

Get state of a single specified GPIO.

Parameters

gpio	GPIO number

Returns: Current state of the GPIO. 0 for low, non-zero for high

◆ gpio_get_all()

static uint32_t gpio_get_all ( void )

inlinestatic

Get raw value of all GPIOs.

Returns: Bitmask of raw GPIO values, as bits 0-29

◆ gpio_get_dir()

static uint gpio_get_dir ( uint gpio )

inlinestatic

Get a specific GPIO direction.

Parameters

gpio	GPIO number

Returns: 1 for out, 0 for in

◆ gpio_get_drive_strength()

enum gpio_drive_strength gpio_get_drive_strength ( uint gpio )

Determine current slew rate for a specified GPIO.

See also: gpio_set_drive_strength

Parameters

gpio	GPIO number

Returns: Current drive strength of that GPIO

◆ gpio_get_function()

enum gpio_function gpio_get_function ( uint gpio )

Determine current GPIO function.

Parameters

gpio	GPIO number

Returns: Which GPIO function is currently selected from list gpio_function

◆ gpio_get_irq_event_mask()

static uint32_t gpio_get_irq_event_mask ( uint gpio )

inlinestatic

Return the current interrupt status (pending events) for the given GPIO.

Parameters

gpio	GPIO number

Returns: Bitmask of events that are currently pending for the GPIO. See gpio_irq_level for details.

See also: gpio_acknowledge_irq

◆ gpio_get_out_level()

static bool gpio_get_out_level ( uint gpio )

inlinestatic

Determine whether a GPIO is currently driven high or low.

This function returns the high/low output level most recently assigned to a GPIO via gpio_put() or similar. This is the value that is presented outward to the IO muxing, not the input level back from the pad (which can be read using gpio_get()).

To avoid races, this function must not be used for read-modify-write sequences when driving GPIOs – instead functions like gpio_put() should be used to atomically update GPIOs. This accessor is intended for debug use only.

Parameters

gpio	GPIO number

Returns: true if the GPIO output level is high, false if low.

◆ gpio_get_slew_rate()

enum gpio_slew_rate gpio_get_slew_rate ( uint gpio )

Determine current slew rate for a specified GPIO.

See also: gpio_set_slew_rate

Parameters

gpio	GPIO number

Returns: Current slew rate of that GPIO

◆ gpio_init()

void gpio_init ( uint gpio )

Initialise a GPIO for (enabled I/O and set func to GPIO_FUNC_SIO)

Clear the output enable (i.e. set to input). Clear any output value.

Parameters

gpio	GPIO number

◆ gpio_init_mask()

void gpio_init_mask ( uint gpio_mask )

Initialise multiple GPIOs (enabled I/O and set func to GPIO_FUNC_SIO)

Clear the output enable (i.e. set to input). Clear any output value.

Parameters

gpio_mask Mask with 1 bit per GPIO number to initialize

◆ gpio_is_dir_out()

static bool gpio_is_dir_out ( uint gpio )

inlinestatic

Check if a specific GPIO direction is OUT.

Parameters

gpio	GPIO number

Returns: true if the direction for the pin is OUT

◆ gpio_is_input_hysteresis_enabled()

bool gpio_is_input_hysteresis_enabled ( uint gpio )

Determine whether input hysteresis is enabled on a specified GPIO.

See also: gpio_set_input_hysteresis_enabled

Parameters

gpio	GPIO number

◆ gpio_is_pulled_down()

static bool gpio_is_pulled_down ( uint gpio )

inlinestatic

Determine if the specified GPIO is pulled down.

Parameters

gpio	GPIO number

Returns: true if the GPIO is pulled down

◆ gpio_is_pulled_up()

static bool gpio_is_pulled_up ( uint gpio )

inlinestatic

Determine if the specified GPIO is pulled up.

Parameters

gpio	GPIO number

Returns: true if the GPIO is pulled up

◆ gpio_pull_down()

static void gpio_pull_down ( uint gpio )

inlinestatic

Set specified GPIO to be pulled down.

Parameters

gpio	GPIO number

◆ gpio_pull_up()

static void gpio_pull_up ( uint gpio )

inlinestatic

Set specified GPIO to be pulled up.

Parameters

gpio	GPIO number

◆ gpio_put()

static void gpio_put	(	uint	gpio,
		bool	value
	)

inlinestatic

Drive a single GPIO high/low.

Parameters

gpio	GPIO number
value	If false clear the GPIO, otherwise set it.

◆ gpio_put_all()

static void gpio_put_all ( uint32_t value )

inlinestatic

Drive all pins simultaneously.

Parameters

value Bitmask of GPIO values to change, as bits 0-29

◆ gpio_put_masked()

static void gpio_put_masked	(	uint32_t	mask,
		uint32_t	value
	)

inlinestatic

Drive GPIO high/low depending on parameters.

Parameters

mask	Bitmask of GPIO values to change, as bits 0-29
value	Value to set

For each 1 bit in mask, drive that pin to the value given by corresponding bit in value, leaving other pins unchanged. Since this uses the TOGL alias, it is concurrency-safe with e.g. an IRQ bashing different pins from the same core.

◆ gpio_remove_raw_irq_handler()

static void gpio_remove_raw_irq_handler	(	uint	gpio,
		irq_handler_t	handler
	)

inlinestatic

Removes a raw GPIO IRQ handler for the specified GPIO on the current core.

In addition to the default mechanism of a single GPIO IRQ event callback per core (see gpio_set_irq_callback), it is possible to add explicit GPIO IRQ handlers which are called independent of the default event callback.

This method removes such a callback, and enables the "default" callback for the specified GPIO.

Parameters

gpio	the GPIO number that will now be passed to the default callback for this core
handler	the handler to remove from the list of GPIO IRQ handlers for this core

◆ gpio_remove_raw_irq_handler_masked()

void gpio_remove_raw_irq_handler_masked	(	uint	gpio_mask,
		irq_handler_t	handler
	)

Removes a raw GPIO IRQ handler for the specified GPIOs on the current core.

In addition to the default mechanism of a single GPIO IRQ event callback per core (see gpio_set_irq_callback), it is possible to add explicit GPIO IRQ handlers which are called independent of the default event callback.

This method removes such a callback, and enables the "default" callback for the specified GPIOs.

Parameters

gpio_mask	a bit mask of the GPIO numbers that will now be passed to the default callback for this core
handler	the handler to remove from the list of GPIO IRQ handlers for this core

◆ gpio_set_dir()

static void gpio_set_dir	(	uint	gpio,
		bool	out
	)

inlinestatic

Set a single GPIO direction.

Parameters

gpio	GPIO number
out	true for out, false for in

◆ gpio_set_dir_all_bits()

static void gpio_set_dir_all_bits ( uint32_t values )

inlinestatic

Set direction of all pins simultaneously.

Parameters

values individual settings for each gpio; for GPIO N, bit N is 1 for out, 0 for in

◆ gpio_set_dir_in_masked()

static void gpio_set_dir_in_masked ( uint32_t mask )

inlinestatic

Set a number of GPIOs to input.

Parameters

mask	Bitmask of GPIO to set to input, as bits 0-29

◆ gpio_set_dir_masked()

static void gpio_set_dir_masked	(	uint32_t	mask,
		uint32_t	value
	)

inlinestatic

Set multiple GPIO directions.

Parameters

mask	Bitmask of GPIO to set to input, as bits 0-29
value	Values to set

For each 1 bit in "mask", switch that pin to the direction given by corresponding bit in "value", leaving other pins unchanged. E.g. gpio_set_dir_masked(0x3, 0x2); -> set pin 0 to input, pin 1 to output, simultaneously.

◆ gpio_set_dir_out_masked()

static void gpio_set_dir_out_masked ( uint32_t mask )

inlinestatic

Set a number of GPIOs to output.

Switch all GPIOs in "mask" to output

Parameters

mask	Bitmask of GPIO to set to output, as bits 0-29

◆ gpio_set_dormant_irq_enabled()

void gpio_set_dormant_irq_enabled	(	uint	gpio,
		uint32_t	event_mask,
		bool	enabled
	)

Enable dormant wake up interrupt for specified GPIO and events.

This configures IRQs to restart the XOSC or ROSC when they are disabled in dormant mode

Parameters

gpio	GPIO number
event_mask	Which events will cause an interrupt. See gpio_irq_level for details.
enabled	Enable/disable flag

◆ gpio_set_drive_strength()

void gpio_set_drive_strength	(	uint	gpio,
		enum gpio_drive_strength	drive
	)

Set drive strength for a specified GPIO.

See also: gpio_get_drive_strength

Parameters

gpio	GPIO number
drive	GPIO output drive strength

◆ gpio_set_function()

void gpio_set_function	(	uint	gpio,
		enum gpio_function	fn
	)

Select GPIO function.

Parameters

gpio	GPIO number
fn	Which GPIO function select to use from list gpio_function

◆ gpio_set_inover()

void gpio_set_inover	(	uint	gpio,
		uint	value
	)

Select GPIO input override.

Parameters

gpio	GPIO number
value	See gpio_override

◆ gpio_set_input_enabled()

void gpio_set_input_enabled	(	uint	gpio,
		bool	enabled
	)

Enable GPIO input.

Parameters

gpio	GPIO number
enabled	true to enable input on specified GPIO

◆ gpio_set_input_hysteresis_enabled()

void gpio_set_input_hysteresis_enabled	(	uint	gpio,
		bool	enabled
	)

Enable/disable GPIO input hysteresis (Schmitt trigger)

Enable or disable the Schmitt trigger hysteresis on a given GPIO. This is enabled on all GPIOs by default. Disabling input hysteresis can lead to inconsistent readings when the input signal has very long rise or fall times, but slightly reduces the GPIO's input delay.

See also: gpio_is_input_hysteresis_enabled

Parameters

gpio	GPIO number
enabled	true to enable input hysteresis on specified GPIO

◆ gpio_set_irq_callback()

void gpio_set_irq_callback ( gpio_irq_callback_t callback )

Set the generic callback used for GPIO IRQ events for the current core.

This function sets the callback used for all GPIO IRQs on the current core that are not explicitly hooked via gpio_add_raw_irq_handler or other gpio_add_raw_irq_handler_ functions.

This function is called with the GPIO number and event mask for each of the (not explicitly hooked) GPIOs that have events enabled and that are pending (see gpio_get_irq_event_mask).

Note: The IO IRQs are independent per-processor. This function affects the processor that calls the function.

Parameters

callback default user function to call on GPIO irq. Note only one of these can be set per processor.

◆ gpio_set_irq_enabled()

void gpio_set_irq_enabled	(	uint	gpio,
		uint32_t	event_mask,
		bool	enabled
	)

Enable or disable specific interrupt events for specified GPIO.

This function sets which GPIO events cause a GPIO interrupt on the calling core. See gpio_set_irq_callback, gpio_set_irq_enabled_with_callback and gpio_add_raw_irq_handler to set up a GPIO interrupt handler to handle the events.

Note: The IO IRQs are independent per-processor. This configures the interrupt events for the processor that calls the function.

Parameters

gpio	GPIO number
event_mask	Which events will cause an interrupt
enabled	Enable or disable flag

Events is a bitmask of the following gpio_irq_level values:

which are specified in gpio_irq_level

◆ gpio_set_irq_enabled_with_callback()

void gpio_set_irq_enabled_with_callback	(	uint	gpio,
		uint32_t	event_mask,
		bool	enabled,
		gpio_irq_callback_t	callback
	)

Convenience function which performs multiple GPIO IRQ related initializations.

This method is a slightly eclectic mix of initialization, that:

Updates whether the specified events for the specified GPIO causes an interrupt on the calling core based on the enable flag.

Sets the callback handler for the calling core to callback (or clears the handler if the callback is NULL).

Enables GPIO IRQs on the current core if enabled is true.

This method is commonly used to perform a one time setup, and following that any additional IRQs/events are enabled via gpio_set_irq_enabled. All GPIOs/events added in this way on the same core share the same callback; for multiple independent handlers for different GPIOs you should use gpio_add_raw_irq_handler and related functions.

This method is equivalent to:

gpio_set_irq_enabled(gpio, event_mask, enabled);
gpio_set_irq_callback(callback);
if (enabled) irq_set_enabled(IO_IRQ_BANK0, true);

Note: The IO IRQs are independent per-processor. This method affects only the processor that calls the function.

Parameters

gpio	GPIO number
event_mask	Which events will cause an interrupt. See gpio_irq_level for details.
enabled	Enable or disable flag
callback	user function to call on GPIO irq. if NULL, the callback is removed

◆ gpio_set_irqover()

void gpio_set_irqover	(	uint	gpio,
		uint	value
	)

Set GPIO IRQ override.

Optionally invert a GPIO IRQ signal, or drive it high or low

Parameters

gpio	GPIO number
value	See gpio_override

◆ gpio_set_mask()

static void gpio_set_mask ( uint32_t mask )

inlinestatic

Drive high every GPIO appearing in mask.

Parameters

mask	Bitmask of GPIO values to set, as bits 0-29

◆ gpio_set_oeover()

void gpio_set_oeover	(	uint	gpio,
		uint	value
	)

Select GPIO output enable override.

Parameters

gpio	GPIO number
value	See gpio_override

◆ gpio_set_outover()

void gpio_set_outover	(	uint	gpio,
		uint	value
	)

Set GPIO output override.

Parameters

gpio	GPIO number
value	See gpio_override

◆ gpio_set_pulls()

void gpio_set_pulls	(	uint	gpio,
		bool	up,
		bool	down
	)

Select up and down pulls on specific GPIO.

Parameters

gpio	GPIO number
up	If true set a pull up on the GPIO
down	If true set a pull down on the GPIO

Note: On the RP2040, setting both pulls enables a "bus keep" function, i.e. a weak pull to whatever is current high/low state of GPIO.

◆ gpio_set_slew_rate()

void gpio_set_slew_rate	(	uint	gpio,
		enum gpio_slew_rate	slew
	)

Set slew rate for a specified GPIO.

See also: gpio_get_slew_rate

Parameters

gpio	GPIO number
slew	GPIO output slew rate

◆ gpio_xor_mask()

static void gpio_xor_mask ( uint32_t mask )

inlinestatic

Toggle every GPIO appearing in mask.

Parameters

mask	Bitmask of GPIO values to toggle, as bits 0-29

Typedefs

Enumerations

Functions

Detailed Description

Function Select Table

Typedef Documentation

◆ gpio_irq_callback_t

Enumeration Type Documentation

◆ gpio_drive_strength

◆ gpio_function

◆ gpio_irq_level

◆ gpio_slew_rate

Function Documentation

◆ gpio_acknowledge_irq()

◆ gpio_add_raw_irq_handler()

◆ gpio_add_raw_irq_handler_masked()

◆ gpio_add_raw_irq_handler_with_order_priority()

◆ gpio_add_raw_irq_handler_with_order_priority_masked()

◆ gpio_clr_mask()

◆ gpio_deinit()

◆ gpio_disable_pulls()

◆ gpio_get()

◆ gpio_get_all()

◆ gpio_get_dir()

◆ gpio_get_drive_strength()

◆ gpio_get_function()

◆ gpio_get_irq_event_mask()

◆ gpio_get_out_level()

◆ gpio_get_slew_rate()

◆ gpio_init()

◆ gpio_init_mask()

◆ gpio_is_dir_out()

◆ gpio_is_input_hysteresis_enabled()

◆ gpio_is_pulled_down()

◆ gpio_is_pulled_up()

◆ gpio_pull_down()

◆ gpio_pull_up()

◆ gpio_put()

◆ gpio_put_all()

◆ gpio_put_masked()

◆ gpio_remove_raw_irq_handler()

◆ gpio_remove_raw_irq_handler_masked()

◆ gpio_set_dir()

◆ gpio_set_dir_all_bits()

◆ gpio_set_dir_in_masked()

◆ gpio_set_dir_masked()

◆ gpio_set_dir_out_masked()

◆ gpio_set_dormant_irq_enabled()

◆ gpio_set_drive_strength()

◆ gpio_set_function()

◆ gpio_set_inover()

◆ gpio_set_input_enabled()

◆ gpio_set_input_hysteresis_enabled()

◆ gpio_set_irq_callback()

◆ gpio_set_irq_enabled()

◆ gpio_set_irq_enabled_with_callback()

◆ gpio_set_irqover()

◆ gpio_set_mask()

◆ gpio_set_oeover()

◆ gpio_set_outover()

◆ gpio_set_pulls()

◆ gpio_set_slew_rate()

◆ gpio_xor_mask()