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 RP2040 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,
};
constexpr Rp2040Config button_connected_to_ground_config{
    .pin = 12,
    .polarity = Polarity::kActiveLow,
    .enable_pull_up = true,
};

// 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 pins:
Rp2040DigitalIn in(input_pin_config);
in.Enable();

Rp2040DigitalIn button(button_connected_to_ground_config);
button.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();

auto button_result = button.GetState();
if (button_result.ok()) {
  if (button_result.value() == State::kActive) {
    PW_LOG_INFO("Button is pressed.");
  }
  if (button_result.value() == State::kInactive) {
    PW_LOG_INFO("Button is released.");
  }
}