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Add doc example for i2c (#112)

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rp2040-hal/src/i2c.rs
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//! Inter-Integrated Circuit (I2C) bus //! Inter-Integrated Circuit (I2C) bus
// Based on: https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2_common/hardware_i2c/i2c.c //!
// Structure from: https://github.com/japaric/stm32f30x-hal/blob/master/src/i2c.rs //! See [Chapter 4 Section 3](https://datasheets.raspberrypi.org/rp2040/rp2040_datasheet.pdf) for more details
// See [Chapter 4 Section 3](https://datasheets.raspberrypi.org/rp2040/rp2040_datasheet.pdf) for more details //!
//! ## Usage
//! ```no_run
//! use embedded_time::rate::Extensions;
//! use rp2040_hal::{i2c::I2C, gpio::Pins, pac, sio::Sio};
//! let mut peripherals = pac::Peripherals::take().unwrap();
//! let sio = Sio::new(peripherals.SIO);
//! let pins = Pins::new(peripherals.IO_BANK0, peripherals.PADS_BANK0, sio.gpio_bank0, &mut peripherals.RESETS);
//!
//! let mut i2c = I2C::i2c1(
//! peripherals.I2C1,
//! pins.gpio18.into_mode(), // sda
//! pins.gpio19.into_mode(), // scl
//! 400.kHz(),
//! &mut peripherals.RESETS,
//! 125_000_000.Hz(),
//! );
//!
//! // Scan for devices on the bus by attempting to read from them
//! use embedded_hal::prelude::_embedded_hal_blocking_i2c_Read;
//! for i in 0..=127 {
//! let mut readbuf: [u8; 1] = [0; 1];
//! let result = i2c.read(i, &mut readbuf);
//! if let Ok(d) = result {
//! // Do whatever work you want to do with found devices
//! // writeln!(uart, "Device found at address{:?}", i).unwrap();
//! }
//! }
//!
//! // Write some data to a device at 0x2c
//! use embedded_hal::prelude::_embedded_hal_blocking_i2c_Write;
//! i2c.write(0x2c, &[1, 2, 3]).unwrap();
//!
//! // Write and then read from a device at 0x3a
//! use embedded_hal::prelude::_embedded_hal_blocking_i2c_WriteRead;
//! let mut readbuf: [u8; 1] = [0; 1];
//! i2c.write_read(0x2c, &[1, 2, 3], &mut readbuf).unwrap();
//! ```
//!
//! See [examples/i2c.rs](https://github.com/rp-rs/rp-hal/tree/main/rp2040-hal/examples/i2c.rs)
//! for a complete example
use crate::{ use crate::{
gpio::pin::bank0::{ gpio::pin::bank0::{
BankPinId, Gpio0, Gpio1, Gpio10, Gpio11, Gpio12, Gpio13, Gpio14, Gpio15, Gpio16, Gpio17, BankPinId, Gpio0, Gpio1, Gpio10, Gpio11, Gpio12, Gpio13, Gpio14, Gpio15, Gpio16, Gpio17,