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pw_digital_io_rp2040

pw_digital_io_rp2040 implements the pw_digital_io interface using the Raspberry Pi Pico SDK.

Setup

Use of this module requires setting up the Pico SDK for use with Pigweed. Follow the steps in Raspberry Pi Pico with pw_system to get setup.

Examples

Use pw::digital_io::Rp2040DigitalIn and pw::digital_io::Rp2040DigitalInOut classes to control GPIO pins.

Example code to use GPIO pins:

#include "pw_digital_io/polarity.h"
#include "pw_digital_io_rp2040/digital_io.h"

using pw::digital_io::Polarity;
using pw::digital_io::Rp2040Config;
using pw::digital_io::Rp2040DigitalIn;
using pw::digital_io::Rp2040DigitalInOut;
using pw::digital_io::State;

constexpr Rp2040Config output_pin_config{
    .pin = 15,
    .polarity = Polarity::kActiveLow,
};
constexpr Rp2040Config input_pin_config{
    .pin = 16,
    .polarity = Polarity::kActiveHigh,
};

// Config output pin:
Rp2040DigitalInOut out(output_pin_config);
out.Enable();

// Set the output pin active.
// This pulls pin to ground since the polarity is kActiveLow.
out.SetState(State::kActive);

// Config input pin:
Rp2040DigitalIn in(input_pin_config);
in.Enable();

// Get the pin state. Since the polarity is kActiveHigh this will return
// State::kActive if the pin is high or and State::kInactive if the pin is
// low (grounded).
State pin_state = in.GetState();