my %rpi_v2_gpio_p1 = (
    3  => Device::BCM2835::RPI_V2_GPIO_P1_03,
    5  => Device::BCM2835::RPI_V2_GPIO_P1_05,
    7  => Device::BCM2835::RPI_V2_GPIO_P1_07,
    ...,
    40 => Device::BCM2835::RPI_V2_GPIO_P1_40,
);