I/O

Digital input and output pins. More...

Macros
#define	INPUT   0x0
	Configures the pin as an input. /.
#define	OUTPUT   0x1
	Configures the pin as an output. /.
#define	INPUT_PULLUP   0x2
	Configures the pin as an input with an internal pull-up resistor. /.
#define	INPUT_FLOATING   INPUT
	Configures the pin as a floating input (same as INPUT). More...
#define	INPUT_PULLDOWN   0x3
	Configures the pin as an input with an internal pull-down resistor. More...
#define	OUTPUT_OPEN_DRAIN   0x4
	Configures the pin as an open-drain output. More...

Functions
void	pinMode (uint8_t pin, uint8_t mode)
	Configures the specified pin to behave either as an input or an output. More...
void	digitalWrite (uint8_t pin, uint8_t val)
	Writes a HIGH or a LOW value to a digital pin. More...
int	digitalRead (uint8_t pin)
	Reads the value from a specified digital pin, either HIGH or LOW. More...

Detailed Description

Digital input and output pins.

Macro Definition Documentation

INPUT_FLOATING

#define INPUT_FLOATING   INPUT

Configures the pin as a floating input (same as INPUT).

Note

RTduino extension. /

INPUT_PULLDOWN

#define INPUT_PULLDOWN   0x3

Configures the pin as an input with an internal pull-down resistor.

Note

RTduino extension. /

OUTPUT_OPEN_DRAIN

#define OUTPUT_OPEN_DRAIN   0x4

Configures the pin as an open-drain output.

Note

RTduino extension. /

Function Documentation

digitalRead()

int digitalRead

(

uint8_t

pin

)

Reads the value from a specified digital pin, either HIGH or LOW.

/

Parameters

pin	The number of the pin to read from.

Returns

The value read from the pin (HIGH or LOW).

See also

https://www.arduino.cc/reference/en/language/functions/digital-io/digitalread

digitalWrite()

void digitalWrite	(	uint8_t	pin,
		uint8_t	val
	)

Writes a HIGH or a LOW value to a digital pin.

/

Parameters

pin	The number of the pin to write to.
val	The value to write (HIGH or LOW).

See also

https://www.arduino.cc/reference/en/language/functions/digital-io/digitalwrite

pinMode()

void pinMode	(	uint8_t	pin,
		uint8_t	mode
	)

Configures the specified pin to behave either as an input or an output.

/

Parameters

pin	The number of the pin to be configured.
mode	The mode to set for the pin (INPUT, OUTPUT, INPUT_PULLUP, INPUT_PULLDOWN, OUTPUT_OPEN_DRAIN).

Note

This function can only be used for digitalRead() and digitalWrite().
For analogRead() or analogWrite(), please DO NOT use this function to configure the pin.

See also

https://www.arduino.cc/reference/en/language/functions/digital-io/pinmode