Fill in solution for compass exercise.

src/exercises/bare-metal/compass/Cargo.lock

@@ -47,6 +47,17 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "compass"
+version = "0.1.0"
+dependencies = [
+ "cortex-m-rt",
+ "embedded-hal",
+ "lsm303agr",
+ "microbit-v2",
+ "panic-halt",
+]
+
 [[package]]
 name = "cortex-m"
 version = "0.7.7"
@@ -147,6 +158,16 @@ dependencies = [
  "crunchy",
 ]
 
+[[package]]
+name = "lsm303agr"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aab0b8c3a75dfdebe9f79c738458da139e8111207d176e9fb6b360117432ac4f"
+dependencies = [
+ "embedded-hal",
+ "nb 1.0.0",
+]
+
 [[package]]
 name = "microbit-common"
 version = "0.13.0"
@@ -308,16 +329,6 @@ dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "temperature-logger"
-version = "0.1.0"
-dependencies = [
- "cortex-m-rt",
- "embedded-hal",
- "microbit-v2",
- "panic-halt",
-]
-
 [[package]]
 name = "tiny-led-matrix"
 version = "1.0.2"

src/exercises/bare-metal/compass/Cargo.toml

@@ -1,12 +1,13 @@
 [workspace]
 
 [package]
-name = "temperature-logger"
+name = "compass"
 version = "0.1.0"
 edition = "2021"
 
 [dependencies]
 cortex-m-rt = "0.7.0"
 embedded-hal = "0.2.6"
+lsm303agr = "0.2.2"
 microbit-v2 = "0.13.0"
 panic-halt = "0.2.0"

src/exercises/bare-metal/compass/src/main.rs

@@ -0,0 +1,62 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#![no_main]
+#![no_std]
+
+extern crate panic_halt as _;
+
+use core::fmt::Write;
+use cortex_m_rt::entry;
+use lsm303agr::{Lsm303agr, MagOutputDataRate};
+use microbit::{
+    hal::{
+        twim::Twim,
+        uarte::{Baudrate, Parity, Uarte},
+    },
+    pac::twim0::frequency::FREQUENCY_A,
+    Board,
+};
+
+#[entry]
+fn main() -> ! {
+    let board = Board::take().unwrap();
+
+    let mut serial = Uarte::new(
+        board.UARTE0,
+        board.uart.into(),
+        Parity::EXCLUDED,
+        Baudrate::BAUD115200,
+    );
+
+    writeln!(serial, "Setting up IMU...").unwrap();
+    let i2c = Twim::new(board.TWIM0, board.i2c_internal.into(), FREQUENCY_A::K100);
+    let mut imu = Lsm303agr::new_with_i2c(i2c);
+    imu.init().unwrap();
+    imu.set_mag_odr(MagOutputDataRate::Hz50).unwrap();
+    let mut imu = imu.into_mag_continuous().ok().unwrap();
+
+    writeln!(serial, "Ready.").unwrap();
+
+    loop {
+        while !imu.mag_status().unwrap().xyz_new_data {}
+        let compass_reading = imu.mag_data().unwrap();
+        writeln!(
+            serial,
+            "{},{},{}",
+            compass_reading.x, compass_reading.y, compass_reading.z
+        )
+        .unwrap();
+    }
+}

src/exercises/bare-metal/temperature-logger/src/main.rs

@@ -1,30 +0,0 @@
-// Copyright 2023 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#![no_main]
-#![no_std]
-
-extern crate panic_halt as _;
-
-use cortex_m_rt::entry;
-use microbit::{hal::twim::Twim, pac::twim0::frequency::FREQUENCY_A, Board};
-
-#[entry]
-fn main() -> ! {
-    let board = Board::take().unwrap();
-
-    let i2c = Twim::new(board.TWIM0, board.i2c_internal.into(), FREQUENCY_A::K100);
-
-    loop {}
-}