Initial commit

.gitignore

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+/target
+/Cargo.lock

Cargo.toml

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+[package]
+name = "qwiic-twist"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+embedded-hal = "0.2.7"
+embedded-time = "0.12.1"

src/lib.rs

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+#![no_std]
+
+mod registers;
+
+use embedded_hal::blocking::i2c::{Read, Write, WriteRead};
+use embedded_hal::prelude::*;
+use embedded_time::rate::Extensions;
+
+/// 7-bit unshifted default I2C Address
+const QWIIC_TWIST_ADDR: u8 = 0x3F;
+
+pub struct QwiicTwist<I2C> {
+    i2c: I2C,
+    address: u8,
+}
+
+impl<I2C, E> QwiicTwist<I2C>
+where
+    I2C: Read<Error = E> + Write<Error = E> + WriteRead<Error = E>,
+{
+    pub fn new(i2c: I2C, address: u8) -> Self {
+        Self { i2c, address }
+    }
+
+    fn read_register(address: u8) -> u8 {
+        todo!()
+    }
+    fn read_register_16(address: u8) -> u16 {
+        todo!()
+    }
+
+    fn write_register(address: u8, value: u8) {
+        todo!()
+    }
+    fn write_register_16(address: u8, value: u16) {
+        todo!()
+    }
+    fn write_register_24(address: u8, value: u32) {
+        todo!()
+    }
+
+    pub fn read_temperature(&mut self) -> Result<u8, E> {
+        let mut temp = [0];
+        self.i2c
+            .write_read(self.address, &[0x78], &mut temp)
+            .and(Ok(temp[0]))
+    }
+}

src/registers.rs

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+/// Map to the various registers on the Twist
+
+const TWIST_ID: u8 = 0x00;
+
+/// - 2 - button clicked
+/// - 1 - button pressed
+/// - 0 - encoder moved
+const TWIST_STATUS: u8 = 0x01;
+const TWIST_VERSION: u8 = 0x02;
+
+/// - 1 - button interrupt
+/// - 0 - encoder interrupt
+const TWIST_ENABLE_INTS: u8 = 0x04;
+
+const TWIST_COUNT: u8 = 0x05;
+const TWIST_DIFFERENCE: u8 = 0x07;
+/// Milliseconds since the last movement of the knob
+const TWIST_LAST_ENCODER_EVENT: u8 = 0x09;
+/// Milliseconds since the last press/release
+const TWIST_LAST_BUTTON_EVENT: u8 = 0x0B;
+
+const TWIST_RED: u8 = 0x0D;
+const TWIST_GREEN: u8 = 0x0E;
+const TWIST_BLUE: u8 = 0x0F;
+
+/// Amount to change the red LED for each encoder tick
+const TWIST_CONNECT_RED: u8 = 0x10;
+/// Amount to change the green LED for each encoder tick
+const TWIST_CONNECT_GREEN: u8 = 0x12;
+/// Amount to change the blue LED for each encoder tick
+const TWIST_CONNECT_BLUE: u8 = 0x14;
+
+const TWIST_TURN_INT_TIMEOUT: u8 = 0x16;
+const TWIST_CHANGE_ADDRESS: u8 = 0x18;
+const TWIST_LIMIT: u8 = 0x19;