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#![no_std]
use embedded_hal::blocking::{delay::DelayMs, i2c::{Write, WriteRead}};
use bitfield::bitfield;
pub struct Driver<I2C> {
i2c: I2C,
integration_time: IntegrationTimes,
gain: Gain
}
impl<E> From<E> for Error<E> {
fn from(error: E) -> Self {
Error::I2cError(error)
}
}
impl<I2C, I2cError> Driver<I2C>
where
I2C: WriteRead<Error = I2cError> + Write<Error = I2cError>
{
pub fn new(i2c: I2C) -> Result<Driver<I2C>, Error<I2cError>> {
let mut driver = Driver {
i2c,
integration_time: IntegrationTimes::_200MS,
gain: Gain::LOW
};
let id = driver.get_id()?;
if id != chip::ID {
return Err(Error::IdMismatch(id));
}
Ok(driver)
}
pub fn new_define_integration(i2c: I2C, integration_time: IntegrationTimes, gain: Gain) -> Result<Driver<I2C>, Error<I2cError>> {
let mut driver = Driver {
i2c,
integration_time,
gain
};
let id = driver.get_id()?;
if id != chip::ID {
return Err(Error::IdMismatch(id));
}
Ok(driver)
}
fn get_id(&mut self) -> Result<u8, Error<I2cError>> {
let mut buffer = [0u8; 1];
self.i2c.write_read(chip::I2C, &[chip::COMMAND_BIT | chip::ID_ADDR], &mut buffer)?;
Ok(buffer[0])
}
pub fn set_gain(&mut self, gain: Option<Gain>) -> Result<(), Error<I2cError>> {
if let Some(gain) = gain {
self.i2c.write(0x29, &[chip::COMMAND_BIT | chip::CONTROL, self.integration_time as u8 | gain as u8])?;
} else {
self.i2c.write(0x29, &[chip::COMMAND_BIT | chip::CONTROL, self.integration_time as u8 | self.gain as u8])?;
}
Ok(())
}
pub fn set_timing(&mut self, integration_time: Option<IntegrationTimes>) -> Result<(), Error<I2cError>> {
if let Some(integration_time) = integration_time {
self.i2c.write(0x29, &[chip::COMMAND_BIT | chip::CONTROL, integration_time as u8| self.gain as u8])?;
} else {
self.i2c.write(0x29, &[chip::COMMAND_BIT | chip::CONTROL, self.integration_time as u8 | self.gain as u8])?;
}
Ok(())
}
pub fn disable(&mut self) -> Result<(), Error<I2cError>> {
self.i2c.write(0x29, &[chip::COMMAND_BIT | chip::ENABLE, chip::ENABLE_POWEROFF])?;
Ok(())
}
pub fn enable(&mut self) -> Result<(), Error<I2cError>> {
self.i2c.write(0x29, &[chip::COMMAND_BIT | chip::ENABLE,
chip::ENABLE_POWERON | chip::ENABLE_AEN | chip::ENABLE_AIEN | chip::ENABLE_NPIEN])?;
Ok(())
}
pub fn get_enable(&mut self) -> Result<Enable, Error<I2cError>> {
let mut status = [0u8; 1];
self.i2c.write_read(chip::I2C, &[chip::COMMAND_BIT | chip::ENABLE], &mut status)?;
Ok(Enable(status[0]))
}
pub fn get_status(&mut self) -> Result<Status, Error<I2cError>> {
let mut status = [0u8; 1];
self.i2c.write_read(chip::I2C, &[chip::COMMAND_BIT | chip::STATUS], &mut status)?;
Ok(Status(status[0]))
}
pub fn get_channel_data<D: DelayMs<u8>>(&mut self, delay: &mut D) -> Result<(u16, u16), Error<I2cError>> {
delay.delay_ms(120);
let mut buffer_1 = [0u8; 2];
let mut buffer_2 = [0u8; 2];
self.i2c.write_read(chip::I2C, &[chip::COMMAND_BIT | chip::CHAN0_LOW], &mut buffer_1)?;
self.i2c.write_read(chip::I2C, &[chip::COMMAND_BIT | chip::CHAN1_LOW], &mut buffer_2)?;
let channel_0 = ((buffer_1[0] as u16) << 8) | buffer_1[1] as u16;
let channel_1 = ((buffer_2[0] as u16) << 8) | buffer_2[1] as u16;
Ok((channel_0, channel_1))
}
pub fn get_luminosity<D: DelayMs<u8>>(&mut self, mode: Mode, delay: &mut D) -> Result<u16, Error<I2cError>> {
let (channel_0, channel_1) = self.get_channel_data(delay)?;
let full_luminosity: u32 = ((channel_1 as u32) << 16 ) | channel_0 as u32;
match mode {
Mode::FullSpectrum => {
Ok(( full_luminosity & 0xFFFF ) as u16)
}
Mode::Infrared => {
Ok((full_luminosity >> 16) as u16)
}
Mode::Visible => {
let infrared_and_visible = full_luminosity & 0xFFFF;
let infrared = full_luminosity >> 16;
if infrared > infrared_and_visible {
Err(Error::InfraredOverflow())
} else {
Ok((infrared_and_visible - infrared) as u16)
}
}
}
}
fn get_integration_in_ms(&self) -> f32 {
match self.integration_time {
IntegrationTimes::_100MS => {
100.
}
IntegrationTimes::_200MS => {
200.
}
IntegrationTimes::_300MS => {
300.
}
IntegrationTimes::_400MS => {
400.
}
IntegrationTimes::_500MS => {
500.
}
IntegrationTimes::_600MS => {
600.
}
}
}
fn get_gain_in_ms(&self) -> f32 {
match self.integration_time {
IntegrationTimes::_100MS => {
100.
}
IntegrationTimes::_200MS => {
200.
}
IntegrationTimes::_300MS => {
300.
}
IntegrationTimes::_400MS => {
400.
}
IntegrationTimes::_500MS => {
500.
}
IntegrationTimes::_600MS => {
600.
}
}
}
pub fn calculate_lux(&mut self, ch_0: u16, ch_1: u16) -> Result<f32, Error<I2cError>> {
let a_time = self.get_integration_in_ms();
let a_gain = self.get_gain_in_ms();
if (ch_0 == 0xFFFF) | (ch_1 == 0xFFFF) {
return Err(Error::SignalOverflow());
}
let cpl = (a_time * a_gain) / 408.0;
let lux = ((ch_0 as f32 - ch_1 as f32)) * (1.0 - (ch_1 as f32 / ch_0 as f32)) / cpl;
Ok(lux)
}
}
pub enum Mode {
Infrared,
Visible,
FullSpectrum,
}
#[derive(Clone, Copy)]
pub enum IntegrationTimes {
_100MS = 0x00,
_200MS = 0x01,
_300MS = 0x02,
_400MS = 0x03,
_500MS = 0x04,
_600MS = 0x05
}
#[derive(Clone, Copy)]
pub enum Gain {
LOW = 0x00,
MED = 0x10,
HIGH = 0x20,
MAX= 0x30
}
mod chip {
pub const I2C: u8 = 0x29;
pub const ID: u8 = 0x50;
pub const ID_ADDR: u8 = 0x12;
pub const COMMAND_BIT: u8 = 0xA0;
pub const ENABLE_POWERON: u8 = 0x01;
pub const ENABLE_AEN: u8 = 0x02;
pub const ENABLE_AIEN: u8 = 0x10;
pub const ENABLE_POWEROFF: u8 = 0x00;
pub const ENABLE_NPIEN: u8 = 0x80;
pub const CHAN0_LOW: u8 = 0x14;
pub const CHAN1_LOW: u8 = 0x16;
pub const ENABLE: u8 = 0x00;
pub const CONTROL: u8 = 0x01;
pub const STATUS: u8 = 0x13;
pub const TSL2591_THRESHOLD_AILTH: u8 = 0x05;
pub const TSL2591_THRESHOLD_AIHTL: u8 = 0x06;
pub const TSL2591_THRESHOLD_AIHTH: u8 = 0x07;
pub const TSL2591_THRESHOLD_NPAILTL: u8 = 0x08;
pub const TSL2591_THRESHOLD_NPAILTH: u8 = 0x09;
pub const TSL2591_THRESHOLD_NPAIHTL: u8 = 0x0A;
pub const TSL2591_THRESHOLD_NPAIHTH: u8 = 0x0B;
pub const TSL2591_PERSIST_FILTER: u8 = 0x0C;
}
#[derive(Clone, Copy, Debug)]
pub enum Error<I2cError> {
I2cError(I2cError),
IdMismatch(u8),
SignalOverflow(),
InfraredOverflow()
}
enum PersitFilter {
TSL2591_PERSIST_EVERY = 0x00,
TSL2591_PERSIST_ANY = 0x01,
TSL2591_PERSIST_2 = 0x02,
TSL2591_PERSIST_3 = 0x03,
TSL2591_PERSIST_5 = 0x04,
TSL2591_PERSIST_10 = 0x05,
TSL2591_PERSIST_15 = 0x06,
TSL2591_PERSIST_20 = 0x07,
TSL2591_PERSIST_25 = 0x08,
TSL2591_PERSIST_30 = 0x09,
TSL2591_PERSIST_35 = 0x0A,
TSL2591_PERSIST_40 = 0x0B,
TSL2591_PERSIST_45 = 0x0C,
TSL2591_PERSIST_50 = 0x0D,
TSL2591_PERSIST_55 = 0x0E,
TSL2591_PERSIST_60 = 0x0F
}
bitfield! {
pub struct Enable(u8);
impl Debug;
pub NPIEN, _: 6;
pub SAI, _: 5;
pub RES, _: 4,3;
pub AEN, _: 1;
pub PON, _: 0;
}
bitfield! {
pub struct Status(u8);
impl Debug;
pub NPINTR,_: 6,4;
pub AINT, _: 4;
pub RES, _: 3,3;
pub AVALID, _: 0;
}