pb200_286.rs

extern crate panic_halt;

use cortex_m::prelude::_embedded_hal_blocking_spi_Transfer;
use stm32l4xx_hal::gpio::*;
use stm32l4xx_hal::pac::*;
use stm32l4xx_hal::rcc::Clocks;
use stm32l4xx_hal::spi::Spi;

use stm32l4xx_hal::rcc::*;
use stm32l4xx_hal::{
    hal::spi::{Mode, Phase, Polarity},
    prelude::*,
};

pub fn get_connexion(
    clocks: Clocks,
    mut apb1r1:&mut APB1R1,

    spi3: SPI3,
    sclk: Pin<Alternate<PushPull, 6>, H8, 'C', 10>,
    miso: Pin<Alternate<PushPull, 6>, H8, 'C', 11>,
    mosi_dummy: Pin<Alternate<PushPull, 6>, H8, 'C', 12>,
) -> Spi<
    SPI3,
    (
        Pin<Alternate<PushPull, 6>, H8, 'C', 10>,
        Pin<Alternate<PushPull, 6>, H8, 'C', 11>,
        Pin<Alternate<PushPull, 6>, H8, 'C', 12>,
    ),
> {
    Spi::spi3(
        spi3,
        (sclk, miso, mosi_dummy),
        Mode {
            phase: Phase::CaptureOnFirstTransition,
            polarity: Polarity::IdleLow,
        },
        1000.kHz(),
        clocks,
        &mut apb1r1,
    )
}

/// Retrieve luminosity data from a Pmod ALS: Ambient Light Sensor
/// INPUT :
///          1: spi -> The SPI module with which you would like to communicate
///          2: cs -> The corresponding Chip Select for this SPI module
///          3: data -> The reference in which the data will be written
/// OUTPUT :
///          NONE

pub fn get_data(
    spi: &mut Spi<
        SPI3,
        (
            Pin<Alternate<PushPull, 6>, H8, 'C', 10>,
            Pin<Alternate<PushPull, 6>, H8, 'C', 11>,
            Pin<Alternate<PushPull, 6>, H8, 'C', 12>,
        ),
    >,
    cs: &mut Pin<Output<PushPull>, L8, 'B', 6>,
    luminosity: &mut i32,
) {
    // Set Chip Select to low to start data exchange
    cs.set_low();

    // Retrieve the data
    let mut buffer = [0x00, 0x00];
    spi.transfer(&mut buffer).unwrap();

    // Set Chip Select to high to stop data exchange
    cs.set_high();

    // Data is send in 2 bytes, with 3 leading and 4 trailing zeros
    let mut lux = buffer[0] << 3;
    lux |= buffer[1] >> 4;

    // Store Data in struct
    *luminosity = lux as i32;
}