PushButton/GPIO

See also

• libgpiod

Goal

Create a PushButton implementation PushButtonGPIO that uses libgpiod to read the switch states.

How

class PushButtonGPIO : public PushButton
{
public:
    PushButtonGPIO(const std::string& gpiodevice, int line_number);
    ...
};

• gpiodevice is for example /dev/gpiochip0

• line_number is the number of the GPIO line (see for example the Raspberry Pi pinout diagram)

Use the libgpiod library to implement the get_state() method.

Testing

Real hardware cannot be tested using unit tests (at least not easily). Write a test program (in tests/) that uses PushButtonGPIO to read the switch state and output its value.