switch to bulk measurements

rust/canapi/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "canapi"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "canapi"
+path = "src/lib.rs"
+
+[features]
+default = []
+
+[dependencies]
+bincode = { version = "2.0.1", default-features = false, features = ["derive"] }

rust/canapi/src/lib.rs

@@ -0,0 +1,138 @@
+#![no_std]
+//! CAN bus API shared crate for PlantCtrl sensors and controller.
+//! Addressing and messages are defined here to be reused by all bus participants.
+
+use bincode::{Decode, Encode};
+
+/// Total plants supported by addressing (0..=15)
+pub const MAX_PLANTS: u8 = 16;
+
+/// Sensors per plant: 0..=1 => A/B
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Encode, Decode)]
+#[repr(u8)]
+pub enum SensorSlot {
+    A = 0,
+    B = 1,
+}
+
+impl SensorSlot {
+    pub const fn from_index(idx: u8) -> Option<Self> {
+        match idx {
+            0 => Some(SensorSlot::A),
+            1 => Some(SensorSlot::B),
+            _ => None,
+        }
+    }
+}
+
+/// Legacy sensor base address kept for compatibility with existing code.
+/// Each plant uses SENSOR_BASE_ADDRESS + plant_index (0..PLANT_COUNT-1).
+/// 11-bit standard ID space, safe range.
+pub const SENSOR_BASE_ADDRESS: u16 = 1000;
+
+/// Typed topics within the SENSOR_BASE space.
+/// Additional offsets allow distinct message semantics while keeping plant-indexed layout.
+pub mod id {
+    use crate::{SensorSlot, MAX_PLANTS, SENSOR_BASE_ADDRESS};
+
+    /// Number of plants addressable per sensor slot group
+    pub const PLANTS_PER_GROUP: u16 = MAX_PLANTS as u16; // 16
+    /// Offset applied for SensorSlot::B within a message group
+    pub const B_OFFSET: u16 = PLANTS_PER_GROUP; // 16
+
+    // Message group base offsets relative to SENSOR_BASE_ADDRESS
+    pub const MOISTURE_DATA_OFFSET: u16 = 0; // periodic data from sensor (sensor -> controller)
+    pub const IDENTIFY_CMD_OFFSET: u16 = 32; // identify LED command (controller -> sensor)
+
+    // Convenience constants for per-slot base offsets
+    pub const IDENTIFY_CMD_OFFSET_A: u16 = IDENTIFY_CMD_OFFSET + 0;
+    pub const IDENTIFY_CMD_OFFSET_B: u16 = IDENTIFY_CMD_OFFSET + B_OFFSET;
+
+    #[inline]
+    pub const fn plant_id(message_type_offset: u16, sensor: SensorSlot, plant: u16) -> u16 {
+        match sensor {
+            SensorSlot::A => SENSOR_BASE_ADDRESS + message_type_offset + plant,
+            SensorSlot::B => SENSOR_BASE_ADDRESS + message_type_offset + B_OFFSET + plant,
+        }
+    }
+
+    /// Kinds of message spaces recognized by the addressing scheme.
+    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+    pub enum MessageKind {
+        MoistureData,  // sensor -> controller
+        IdentifyCmd,   // controller -> sensor
+    }
+
+    /// Try to classify a received 11-bit standard ID into a known message kind and extract plant and sensor slot.
+    /// Returns (kind, plant, slot) on success.
+    #[inline]
+    pub const fn classify(id: u16) -> Option<(MessageKind, u8, SensorSlot)> {
+        // Ensure the ID is within our base space
+        if id < SENSOR_BASE_ADDRESS {
+            return None;
+        }
+        let rel = id - SENSOR_BASE_ADDRESS;
+
+        // Helper: decode within a given group offset
+        const fn decode_in_group(rel: u16, group_base: u16) -> Option<(u8, SensorSlot)> {
+            if rel < group_base { return None; }
+            let inner = rel - group_base;
+            if inner < PLANTS_PER_GROUP { // A slot
+                Some((inner as u8, SensorSlot::A))
+            } else if inner >= B_OFFSET && inner < B_OFFSET + PLANTS_PER_GROUP { // B slot
+                Some(((inner - B_OFFSET) as u8, SensorSlot::B))
+            } else {
+                None
+            }
+        }
+
+        // Check known groups in order
+        if let Some((plant, slot)) = decode_in_group(rel, MOISTURE_DATA_OFFSET) {
+            return Some((MessageKind::MoistureData, plant, slot));
+        }
+        if let Some((plant, slot)) = decode_in_group(rel, IDENTIFY_CMD_OFFSET) {
+            return Some((MessageKind::IdentifyCmd, plant, slot));
+        }
+        None
+    }
+
+    /// Returns Some((plant, slot)) regardless of message kind, if the id falls into any known group; otherwise None.
+    #[inline]
+    pub const fn extract_plant_slot(id: u16) -> Option<(u8, SensorSlot)> {
+        match classify(id) {
+            Some((_kind, plant, slot)) => Some((plant, slot)),
+            None => None,
+        }
+    }
+
+    /// Check if an id corresponds exactly to the given message kind, plant and slot.
+    #[inline]
+    pub const fn is_identify_for(id: u16, plant: u8, slot: SensorSlot) -> bool {
+        id == plant_id(IDENTIFY_CMD_OFFSET, slot, plant as u16)
+    }
+
+    #[inline]
+    pub const fn is_moisture_data_for(id: u16, plant: u8, slot: SensorSlot) -> bool {
+        id == plant_id(MOISTURE_DATA_OFFSET, slot, plant as u16)
+    }
+}
+
+/// Periodic moisture data sent by sensors.
+/// Fits into 5 bytes with bincode-v2 (no varint): u8 + u8 + u16 = 4, alignment may keep 4.
+#[derive(Debug, Clone, Copy, Encode, Decode)]
+pub struct MoistureData {
+    pub plant: u8,         // 0..MAX_PLANTS-1
+    pub sensor: SensorSlot, // A/B
+    pub hz: u16,           // measured frequency of moisture sensor
+}
+
+/// Request a sensor to report immediately (controller -> sensor).
+#[derive(Debug, Clone, Copy, Encode, Decode)]
+pub struct MoistureRequest {
+    pub plant: u8,
+    pub sensor: SensorSlot, // target sensor (sensor filters by this)
+}
+
+/// Control a sensor's identify LED, if received by sensor, blink for a few seconds
+#[derive(Debug, Clone, Copy, Encode, Decode)]
+pub struct IdentifyLed {}