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use crate::{ic, private, Error};
#[doc(hidden)]
pub trait ConvertThreshold<E>: private::Sealed {
fn convert_threshold(value: i16) -> Result<u16, Error<E>>;
}
impl<E> ConvertThreshold<E> for ic::Resolution12Bit {
fn convert_threshold(value: i16) -> Result<u16, Error<E>> {
if value < -2048 || value > 2047 {
return Err(Error::InvalidInputData);
}
Ok((value << 4) as u16)
}
}
impl<E> ConvertThreshold<E> for ic::Resolution16Bit {
fn convert_threshold(value: i16) -> Result<u16, Error<E>> {
Ok(value as u16)
}
}
#[doc(hidden)]
pub trait ConvertMeasurement: private::Sealed {
fn convert_measurement(register_data: u16) -> i16;
}
impl ConvertMeasurement for ic::Resolution12Bit {
fn convert_measurement(register_data: u16) -> i16 {
let value = register_data;
let is_negative = (value & 0b1000_0000_0000_0000) != 0;
if is_negative {
let value = 0b1111_0000_0000_0000 | (value >> 4);
value as i16
} else {
(value >> 4) as i16
}
}
}
impl ConvertMeasurement for ic::Resolution16Bit {
fn convert_measurement(register_data: u16) -> i16 {
register_data as i16
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn convert_measurement_12_bits() {
assert_eq!(0, ic::Resolution12Bit::convert_measurement(0));
assert_eq!(2047, ic::Resolution12Bit::convert_measurement(0x7FFF));
assert_eq!(-2048, ic::Resolution12Bit::convert_measurement(0x8000));
assert_eq!(-1, ic::Resolution12Bit::convert_measurement(0xFFFF));
}
#[test]
fn convert_measurement_16_bits() {
assert_eq!(0, ic::Resolution16Bit::convert_measurement(0));
assert_eq!(32767, ic::Resolution16Bit::convert_measurement(0x7FFF));
assert_eq!(-32768, ic::Resolution16Bit::convert_measurement(0x8000));
assert_eq!(-1, ic::Resolution16Bit::convert_measurement(0xFFFF));
}
fn assert_invalid_input_data<E>(result: Result<u16, Error<E>>) {
match result {
Err(Error::InvalidInputData) => (),
_ => panic!("InvalidInputData error was not returned."),
}
}
#[test]
fn check_assert_matches() {
assert_invalid_input_data::<()>(Err(Error::InvalidInputData));
}
#[test]
#[should_panic]
fn check_assert_fails() {
assert_invalid_input_data::<()>(Ok(0));
}
fn convert_threshold<T: ConvertThreshold<()>>(value: i16) -> u16 {
T::convert_threshold(value).unwrap()
}
#[test]
fn convert_threshold_12_bits() {
assert_invalid_input_data::<()>(ic::Resolution12Bit::convert_threshold(2048));
assert_invalid_input_data::<()>(ic::Resolution12Bit::convert_threshold(-2049));
assert_eq!(0, convert_threshold::<ic::Resolution12Bit>(0));
assert_eq!(0x7FF0, convert_threshold::<ic::Resolution12Bit>(2047));
assert_eq!(0x8000, convert_threshold::<ic::Resolution12Bit>(-2048));
assert_eq!(0xFFF0, convert_threshold::<ic::Resolution12Bit>(-1));
}
#[test]
fn convert_threshold_16_bits() {
assert_eq!(0x7FFF, convert_threshold::<ic::Resolution16Bit>(32767));
assert_eq!(0x8000, convert_threshold::<ic::Resolution16Bit>(-32768));
}
}
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