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Add more hints for bare metal morning exercise.

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Andrew Walbran 2023-03-24 17:50:03 +00:00
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6
src/exercises/bare-metal/compass.md
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@ -10,6 +10,12 @@ Hints:
[micro:bit hardware](https://tech.microbit.org/hardware/). [micro:bit hardware](https://tech.microbit.org/hardware/).
- The LSM303AGR Inertial Measurement Unit is connected to the internal I2C bus. - The LSM303AGR Inertial Measurement Unit is connected to the internal I2C bus.
- TWI is another name for I2C, so the I2C master peripheral is called TWIM. - TWI is another name for I2C, so the I2C master peripheral is called TWIM.
- The LSM303AGR driver needs something implementing the `embedded_hal::blocking::i2c::WriteRead`
trait. The
[`microbit::hal::Twim`](https://docs.rs/microbit-v2/latest/microbit/hal/struct.Twim.html) struct
implements this.
- You have a [`microbit::Board`](https://docs.rs/microbit-v2/latest/microbit/struct.Board.html)
struct with fields for the various pins and peripherals.
- You can also look at the - You can also look at the
[nRF52833 datasheet](https://infocenter.nordicsemi.com/pdf/nRF52833_PS_v1.5.pdf) if you want, but [nRF52833 datasheet](https://infocenter.nordicsemi.com/pdf/nRF52833_PS_v1.5.pdf) if you want, but
it shouldn't be necessary for this exercise. it shouldn't be necessary for this exercise.