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Template, hint and extension for compass exercise.

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This commit is contained in:
Andrew Walbran 2023-02-15 23:06:17 +00:00
parent 062129546a
commit 354834c711
2 changed files with 22 additions and 1 deletions
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14
src/exercises/bare-metal/compass.md
View File

@ -2,6 +2,18 @@
We will read the temperature from an I2C compass, and log the readings to a serial port.
Hint: check the documentation for the [`lsm303agr`](https://docs.rs/lsm303agr/latest/lsm303agr/) and
[`microbit-v2`](https://docs.rs/microbit-v2/latest/microbit/) crates.
If you have time, try displaying it on the LEDs somehow too, or use the buttons somehow.
```rust,should_panic
{{#include compass/src/main.rs}}
{{#include compass/src/main.rs:top}}
use microbit::{hal::uarte::{Baudrate, Parity, Uarte}, Board};
{{#include compass/src/main.rs:main}}
{{#include compass/src/main.rs:loop}}
}
}
```

9
src/exercises/bare-metal/compass/src/main.rs
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@ -12,6 +12,7 @@
// See the License for the specific language governing permissions and
// limitations under the License.
// ANCHOR: top
#![no_main]
#![no_std]
@ -19,6 +20,7 @@ extern crate panic_halt as _;
use core::fmt::Write;
use cortex_m_rt::entry;
// ANCHOR_END: top
use lsm303agr::{Lsm303agr, MagOutputDataRate};
use microbit::{
hal::{
@ -29,10 +31,12 @@ use microbit::{
Board,
};
// ANCHOR: main
#[entry]
fn main() -> ! {
let board = Board::take().unwrap();
// Configure serial port.
let mut serial = Uarte::new(
board.UARTE0,
board.uart.into(),
@ -40,6 +44,8 @@ fn main() -> ! {
Baudrate::BAUD115200,
);
// Set up the I2C controller and IMU.
// ANCHOR_END: main
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);
@ -47,9 +53,12 @@ fn main() -> ! {
imu.set_mag_odr(MagOutputDataRate::Hz50).unwrap();
let mut imu = imu.into_mag_continuous().ok().unwrap();
// ANCHOR: loop
writeln!(serial, "Ready.").unwrap();
loop {
// Read compass data and log it to the serial port.
// ANCHOR_END: loop
while !imu.mag_status().unwrap().xyz_new_data {}
let compass_reading = imu.mag_data().unwrap();
writeln!(