Implement reading values from the BME280.

display/firmware/Cargo.lock

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display/firmware/Cargo.toml

 mkl25z4-hal = { git = "https://github.com/mgottschlag/mkl25z4-hal" }
 embedded-hal = "0.2.3"
 nb = "0.1.2"
-bme280 = "0.2.1"
+bme280 = { git = "https://github.com/mgottschlag/bme280-rs", branch = "destroy" }
 embedded-nrf24l01 = { git = "https://github.com/astro/embedded-nrf24l01" }
 epd-waveshare = { git = "https://github.com/mgottschlag/epd-waveshare.git", branch = "streaming" }
 tinygfx = { git = "https://github.com/mgottschlag/tinygfx" }

display/firmware/src/main.rs

 mod display;
 mod information;
 mod pins;
+mod sensors;
 
 // TODO: Enable warnings again.
 #[allow(unused)]
 
 use display::{Display, DisplayState};
 use information::{Information, TemperatureHumidity};
-use pins::DisplayBmeSpi;
+use pins::{BME280Pins, DisplayBmeSpi};
 
 #[rtfm::app(device = mkl25z4_hal::mkl25z4, peripherals = true)]
 const APP: () = {
         display_state: DisplayState,
         display: Display,
         display_bme_spi: Option<DisplayBmeSpi>,
+        bme_pins: Option<BME280Pins>,
         time: CopyableMonoTimer,
     }
 
             },
             display,
             display_bme_spi: Some(pins.display_bme_spi),
+            bme_pins: Some(pins.bme),
             time,
         }
     }
         // TODO
     }
 
-    #[task(priority = 1, spawn = [update_display], resources = [info])]
+    #[task(priority = 1, spawn = [update_display], resources = [info, bme_pins, display_bme_spi, &time])]
     fn fetch_update(mut ctx: fetch_update::Context) {
         // Fetch local updates.
-        // TODO
+        let time = ctx.resources.time.clone();
+        let pins = ctx.resources.bme_pins.take().unwrap();
+        let (pins, values) = ctx.resources.display_bme_spi.lock(|display_bme_spi| {
+            let spi = display_bme_spi.take().unwrap();
+            let (pins, spi, values) = sensors::bme280(pins, spi, time);
+            *display_bme_spi = Some(spi);
+            (pins, values)
+        });
+        *ctx.resources.bme_pins = Some(pins);
 
         // Send local measurements to the base station. This needs to be done before fetching data
         // from the base station as the base station might return the data to us.
         // TODO
         ctx.resources.info.lock(|info| {
             info.inside = Some(TemperatureHumidity {
-                temperature: -212,
-                humidity: 345,
+                temperature: values.temperature,
+                humidity: values.humidity,
             });
-            info.pressure = Some(100000);
+            info.pressure = Some(values.pressure);
         });
 
         // If the update failed, simply increment the time and place a hint that

display/firmware/src/sensors.rs

+use bme280::spi::BME280;
+use embedded_hal::digital::v2::OutputPin;
+use mkl25z4_hal::time::CopyableMonoTimer;
+
+use super::pins::{BME280Pins, DisplayBmeSpi};
+
+pub fn bme280(
+    mut pins: BME280Pins,
+    spi: DisplayBmeSpi,
+    delay: CopyableMonoTimer,
+) -> (BME280Pins, DisplayBmeSpi, BME280Data) {
+    // Enable power.
+    pins.pwr.set_low().ok();
+
+    // Read the sensor.
+    let mut bme = BME280::new(spi, pins.cs, delay).unwrap();
+    bme.init().unwrap();
+    let values = bme.measure().unwrap();
+    let (spi, cs, _) = bme.destroy();
+
+    // Disable power again.
+    pins.pwr.set_high().ok();
+    (
+        BME280Pins {
+            pwr: pins.pwr,
+            cs: cs,
+        },
+        spi,
+        BME280Data {
+            temperature: (values.temperature * 10.0) as i32,
+            humidity: (values.humidity * 10.0) as u32,
+            pressure: values.pressure as u32,
+        },
+    )
+}
+
+pub struct BME280Data {
+    pub temperature: i32,
+    pub humidity: u32,
+    pub pressure: u32,
+}