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  1. or download this
      # Low level register access
  Device::BCM2835::peri_read(&Device::BCM2835::BCM2835_GPIO_BASE + &De
+vice::BCM2835::BCM2835_GPFSEL1);
  Device::BCM2835::peri_write(&Device::BCM2835::BCM2835_GPIO_BASE + &D
+evice::BCM2835::BCM2835_GPFSEL2, 0xdeadbeef)
  Device::BCM2835::peri_set_bits(&Device::BCM2835::BCM2835_GPIO_BASE +
+ &Device::BCM2835::BCM2835_GPFSEL3, 0xdeadbeef, 0x1f);
  2. or download this
    Device::BCM2835::gpio_fsel($_, &Device::BCM2835::BCM2835_GPIO_FSEL_OUT
+P) for @pins;