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

my @rpi_v2_gpio_p1;
for ( @Device::BCM2835::EXPORT_OK ) {
...
   my $val = do { no strict "refs"; "Device::BCM2835::$_"->() };
   $rpi_v2_gpio_p1[ $pin ] = $val;
}

my @rpi_v2_gpio_p1;
for ( @Device::BCM2835::EXPORT_OK ) {
...
   my $val = ( \&{"Device::BCM2835::$_"} )->();
   $rpi_v2_gpio_p1[ $pin ] = $val;
}