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pub trait DhtKind {
#[doc(hidden)]
const START_DELAY_US: u16;
#[doc(hidden)]
fn temp_celcius(integral: u8, decimal: u8) -> f32;
#[doc(hidden)]
fn humidity_percent(integral: u8, decimal: u8) -> f32;
}
pub struct Dht11 {
_p: (),
}
pub struct Dht22 {
_p: (),
}
impl DhtKind for Dht11 {
const START_DELAY_US: u16 = 20 * 1000;
fn temp_celcius(integral: u8, decimal: u8) -> f32 {
let mut temp = integral as f32;
if decimal & 0x80 != 0 {
temp = -1.0 - temp;
}
temp + (decimal & 0x0f) as f32 * 0.1
}
fn humidity_percent(integral: u8, decimal: u8) -> f32 {
integral as f32 + decimal as f32 * 0.1
}
}
impl DhtKind for Dht22 {
const START_DELAY_US: u16 = 1100;
fn temp_celcius(integral: u8, decimal: u8) -> f32 {
let mut temp = (((integral & 0x7F) as u16) << 8 | decimal as u16) as f32;
temp *= 0.1;
if integral & 0x80 != 0 {
temp *= -1.0;
}
temp
}
fn humidity_percent(integral: u8, decimal: u8) -> f32 {
((integral as u16) << 8 | decimal as u16) as f32 * 0.1
}
}