General Purpose Input/Output

lbuild module: modm:architecture:gpio

GPIOs are modeled as individual classes with an interface consisting out of a common set of static methods.

Using GPIOs

These classes are used to create architecture independent definitions for hardware pins which then can be used as template parameters for miscellaneous device drivers.

Example of a platform-independent blinking light:

#include <modm/platform.hpp>

using Led = GpioOutputB0;

Led::setOutput();
Led::set();

while (true)
{
    Led::toggle();
    modm::delay(500ms);
}

You can use the common definitions of modm::Gpio to express your intention for setting a pin. However, you can also use anything that casts to bool.

Led::set(modm::Gpio::High); // Turns Led on
Led::set(modm::Gpio::Low); // Turns Led off
Led::set(true);
Led::set(false);
Led::set(1);
Led::set(0);
Led::set();
Led::reset();

Initialize your GPIOs

Call Gpio::setInput() or Gpio::setOutput() before the first use, otherwise the GPIO state may be undefined!

See the modm:platform:gpio module for platform-specific GPIO behaviors, especially signal connections to peripherals.