# Low level register access
  Device::BCM2835::peri_read(&Device::BCM2835::BCM2835_GPIO_BASE + &Device::BCM2835::BCM2835_GPFSEL1);
  Device::BCM2835::peri_write(&Device::BCM2835::BCM2835_GPIO_BASE + &Device::BCM2835::BCM2835_GPFSEL2, 0xdeadbeef)
  Device::BCM2835::peri_set_bits(&Device::BCM2835::BCM2835_GPIO_BASE + &Device::BCM2835::BCM2835_GPFSEL3, 0xdeadbeef, 0x1f);