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use crate::{Calibration, DynamicSetting, Error, IntegrationTime, Measurement, Mode, Veml6075};
use embedded_hal::blocking::i2c::{Write, WriteRead};
struct Register;
impl Register {
const CONFIG: u8 = 0x00;
const UVA: u8 = 0x07;
const UVB: u8 = 0x09;
const UVCOMP1: u8 = 0x0A;
const UVCOMP2: u8 = 0x0B;
const DEVICE_ID: u8 = 0x0C;
}
struct BitFlags;
impl BitFlags {
const SHUTDOWN: u8 = 0b0000_0001;
const HD: u8 = 0b0000_1000;
const UV_TRIG: u8 = 0b0000_0100;
const UV_AF: u8 = 0b0000_0010;
}
const DEVICE_ADDRESS: u8 = 0x10;
impl<I2C, E> Veml6075<I2C>
where
I2C: Write<Error = E>,
{
pub fn new(i2c: I2C, calibration: Calibration) -> Self {
Veml6075 {
i2c,
config: 0x01,
calibration,
}
}
pub fn destroy(self) -> I2C {
self.i2c
}
pub fn enable(&mut self) -> Result<(), Error<E>> {
let config = self.config;
self.write_config(config & !BitFlags::SHUTDOWN)
}
pub fn disable(&mut self) -> Result<(), Error<E>> {
let config = self.config;
self.write_config(config | BitFlags::SHUTDOWN)
}
pub fn set_mode(&mut self, mode: Mode) -> Result<(), Error<E>> {
let config = match mode {
Mode::Continuous => self.config & !BitFlags::UV_AF,
Mode::ActiveForce => self.config | BitFlags::UV_AF,
};
self.write_config(config)
}
pub fn trigger_measurement(&mut self) -> Result<(), Error<E>> {
let config = self.config | BitFlags::UV_TRIG;
self.i2c
.write(DEVICE_ADDRESS, &[Register::CONFIG, config, 0])
.map_err(Error::I2C)
}
pub fn set_integration_time(&mut self, it: IntegrationTime) -> Result<(), Error<E>> {
let config = self.config & 0b1000_1111;
let config = match it {
IntegrationTime::Ms50 => config,
IntegrationTime::Ms100 => config | 1 << 4,
IntegrationTime::Ms200 => config | 2 << 4,
IntegrationTime::Ms400 => config | 3 << 4,
IntegrationTime::Ms800 => config | 4 << 4,
};
self.write_config(config)
}
pub fn set_dynamic_setting(&mut self, ds: DynamicSetting) -> Result<(), Error<E>> {
let config = match ds {
DynamicSetting::Normal => self.config & !BitFlags::HD,
DynamicSetting::High => self.config | BitFlags::HD,
};
self.write_config(config)
}
fn write_config(&mut self, config: u8) -> Result<(), Error<E>> {
self.i2c
.write(DEVICE_ADDRESS, &[Register::CONFIG, config, 0])
.map_err(Error::I2C)?;
self.config = config;
Ok(())
}
}
impl<I2C, E> Veml6075<I2C>
where
I2C: WriteRead<Error = E>,
{
pub fn read(&mut self) -> Result<Measurement, Error<E>> {
let uva = self.read_uva_raw()?;
let uvb = self.read_uvb_raw()?;
let uvcomp1 = self.read_uvcomp1_raw()?;
let uvcomp2 = self.read_uvcomp2_raw()?;
let uva = f32::from(uva)
- (self.calibration.uva_visible * f32::from(uvcomp1))
- (self.calibration.uva_ir * f32::from(uvcomp2));
let uvb = f32::from(uvb)
- (self.calibration.uvb_visible * f32::from(uvcomp1))
- (self.calibration.uvb_ir * f32::from(uvcomp2));
let uv_index = (uva * self.calibration.uva_responsivity
+ uvb * self.calibration.uvb_responsivity)
/ 2.0;
Ok(Measurement { uva, uvb, uv_index })
}
pub fn read_uva_raw(&mut self) -> Result<u16, Error<E>> {
self.read_register(Register::UVA)
}
pub fn read_uvb_raw(&mut self) -> Result<u16, Error<E>> {
self.read_register(Register::UVB)
}
pub fn read_uvcomp1_raw(&mut self) -> Result<u16, Error<E>> {
self.read_register(Register::UVCOMP1)
}
pub fn read_uvcomp2_raw(&mut self) -> Result<u16, Error<E>> {
self.read_register(Register::UVCOMP2)
}
pub fn read_device_id(&mut self) -> Result<u16, Error<E>> {
self.read_register(Register::DEVICE_ID)
}
fn read_register(&mut self, register: u8) -> Result<u16, Error<E>> {
let mut data = [0; 2];
self.i2c
.write_read(DEVICE_ADDRESS, &[register], &mut data)
.map_err(Error::I2C)?;
Ok(u16::from(data[1]) << 8 | u16::from(data[0]))
}
}