Référence du fichier wiring_digital.c

#include "Arduino.h"

Fonctions
void	pinMode (uint32_t ulPin, uint32_t ulMode)
	Configures the specified pin to behave either as an input or an output. See the description of digital pins for details. Plus de détails...
void	digitalWrite (uint32_t ulPin, uint32_t ulVal)
	Write a HIGH or a LOW value to a digital pin. Plus de détails...
int	digitalRead (uint32_t ulPin)
	Reads the value from a specified digital pin, either HIGH or LOW. Plus de détails...
void	setDriveStrength (uint32_t ulPin, uint8_t high)

Documentation des fonctions

digitalRead()

int digitalRead

(

uint32_t

ulPin

)

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

Paramètres

ulPin

The number of the digital pin you want to read (int)

Renvoie

HIGH or LOW

digitalWrite()

void digitalWrite	(	uint32_t	dwPin,
		uint32_t	dwVal
	)

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

If the pin has been configured as an OUTPUT with pinMode(), its voltage will be set to the corresponding value: 5V (or 3.3V on 3.3V boards) for HIGH, 0V (ground) for LOW.

If the pin is configured as an INPUT, writing a HIGH value with digitalWrite() will enable an internal 20K pullup resistor (see the tutorial on digital pins). Writing LOW will disable the pullup. The pullup resistor is enough to light an LED dimly, so if LEDs appear to work, but very dimly, this is a likely cause. The remedy is to set the pin to an output with the pinMode() function.

Note

Digital pin PIN_LED is harder to use as a digital input than the other digital pins because it has an LED and resistor attached to it that's soldered to the board on most boards. If you enable its internal 20k pull-up resistor, it will hang at around 1.7 V instead of the expected 5V because the onboard LED and series resistor pull the voltage level down, meaning it always returns LOW. If you must use pin PIN_LED as a digital input, use an external pull down resistor.

Paramètres

dwPin	the pin number
dwVal	HIGH or LOW

pinMode()

void pinMode	(	uint32_t	dwPin,
		uint32_t	dwMode
	)

Configures the specified pin to behave either as an input or an output. See the description of digital pins for details.

Paramètres

ulPin	The number of the pin whose mode you wish to set
ulMode	Can be INPUT, OUTPUT, INPUT_PULLUP or INPUT_PULLDOWN

setDriveStrength()

void setDriveStrength	(	uint32_t	ulPin,
		uint8_t	high
	)