warning: docs for unsafe trait missing `# Safety` section
  --> src/spi.rs:81:1
   |
81 | pub unsafe trait Pins<SPI> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
  --> src/spi.rs:78:1
   |
78 | pub unsafe trait SclkPin<SPI> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
  --> src/spi.rs:75:1
   |
75 | pub unsafe trait SsPin<SPI> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
  --> src/spi.rs:72:1
   |
72 | pub unsafe trait MosiPin<SPI> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
  --> src/spi.rs:69:1
   |
69 | pub unsafe trait MisoPin<SPI> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
   --> src/serial.rs:389:1
    |
389 | pub unsafe trait Pins<UART> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
   --> src/serial.rs:358:1
    |
358 | pub unsafe trait CtsPin<UART> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
   --> src/serial.rs:356:1
    |
356 | pub unsafe trait RtsPin<UART> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
   --> src/serial.rs:354:1
    |
354 | pub unsafe trait RxPin<UART> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
   --> src/serial.rs:352:1
    |
352 | pub unsafe trait TxPin<UART> {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
  --> src/i2c.rs:64:1
   |
64 | pub unsafe trait Pins<I2C> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
  --> src/i2c.rs:61:1
   |
61 | pub unsafe trait SclPin<I2C> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc

warning: docs for unsafe trait missing `# Safety` section
  --> src/i2c.rs:58:1
   |
58 | pub unsafe trait SdaPin<I2C> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_safety_doc
   = note: `#[warn(clippy::missing_safety_doc)]` on by default

warning: unneeded unit return type
   --> src/watchdog.rs:235:23
    |
235 |     fn feed(&mut self) -> () {
    |                       ^^^^^^ help: remove the `-> ()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
    = note: `#[warn(clippy::unused_unit)]` on by default