Struct Bargraph 

pub struct Bargraph<I2C> { /* private fields */ }

The bargraph state.

Implementations

impl<I2C, E> Bargraph<I2C>

where I2C: Write<Error = E> + WriteRead<Error = E>,

pub fn new<L>(i2c: I2C, i2c_address: u8, logger: L) -> Self

where L: Into<Option<Logger>>,

Create a Bargraph for display.

Arguments

• device - A connected HT16K33 device that drives the display.
• logger - A logging instance.

Notes

logger = None will log to the slog-stdlog drain. This makes the library effectively work the same as if it was just using log instead of slog.

Examples

// NOTE: `None is used for the Logger in these examples for convenience,
// in practice using an actual logger in preferred.

extern crate ht16k33;
extern crate led_bargraph;

use ht16k33::i2c_mock::I2cMock;
use led_bargraph::Bargraph;

// Create an I2C device.
let mut i2c = I2cMock::new(None);

// The I2C device address.
let address: u8 = 0;

let mut bargraph = Bargraph::new(i2c, address, None);

pub fn initialize(&mut self) -> Result<(), E>

Initialize the Bargraph display & the connected HT16K33 device.

Examples

let mut bargraph = Bargraph::new(i2c, address, None);
bargraph.initialize().unwrap();

pub fn clear(&mut self) -> Result<(), E>

Clear the Bargraph display.

Examples

let mut bargraph = Bargraph::new(i2c, address, None);
bargraph.clear().unwrap();

pub fn update(&mut self, value: u8, range: u8, show: bool) -> Result<(), E>

Update the Bargraph display, showing range total values with all values from 0 to value filled.

If value is greater than range, then all bars are filled and will blink; automatic re-scaling of the range does not happen because:

• The bargraph can only scale to a maximum resolution.
• Users are already familiar with viewing the current range, and dynamically changing the range makes it hard for users to see what’s happening at a glance.

Arguments

• value - How many values to fill, starting from 0.
• range - Total number of values to display.

Examples

let mut bargraph = Bargraph::new(i2c, address, None);
bargraph.update(5, 6, false).unwrap();

pub fn set_blink(&mut self, enabled: bool) -> Result<(), E>

Enable/Disable continuous blinking of the Bargraph display.

Arguments

• enabled - Whether to enabled blinking or not.

Examples

let mut bargraph = Bargraph::new(i2c, address, None);
bargraph.set_blink(true).unwrap();

pub fn show(&mut self) -> Result<(), E>

Show the current bargraph display on-screen.

Examples

let mut bargraph = Bargraph::new(i2c, address, None);
bargraph.show().unwrap();