inital structure for bms communication protocol implemented

Cargo.lock

@@ -535,6 +535,9 @@ dependencies = [
 [[package]]
 name = "lib-bms-protocol"
 version = "0.1.0"
+dependencies = [
+ "embedded-hal 1.0.0",
+]
 
 [[package]]
 name = "litrs"

lib-bms-protocol/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+embedded-hal = "1.0.0"
 
 
 [profile.dev]

lib-bms-protocol/src/lib.rs

@@ -1,29 +1,190 @@
 #![no_std]
 
+use embedded_hal::i2c::{I2c, Operation, SevenBitAddress};
+
+pub const BMS_I2C_ADDRESS: u8 = 0x55;
+
+pub trait BmsReadable {
+    fn read_from_i2c<I>(i2c_dev: &mut I) -> Result<Self, BmsProtocolError>
+    where
+        Self: Sized,
+        I: I2c<SevenBitAddress>;
+}
+
+pub trait BmsWriteable {
+    fn write_to_device<I>(&self, i2c_dev: &mut I) -> Result<(), BmsProtocolError>
+    where
+        I: I2c<SevenBitAddress>;
+}
+
+pub enum BmsProtocolError {
+    I2cCommunicationError,
+}
+
+impl<E> From<E> for BmsProtocolError
+where
+    E: embedded_hal::i2c::Error,
+{
+    fn from(_value: E) -> Self {
+        Self::I2cCommunicationError
+    }
+}
+
+#[derive(Debug)]
+pub struct BmsSoftwareReset;
+
+impl BmsWriteable for BmsSoftwareReset {
+    fn write_to_device<I>(&self, i2c_dev: &mut I) -> Result<(), BmsProtocolError>
+    where
+        I: I2c<SevenBitAddress>,
+    {
+        i2c_dev.write(
+            BMS_I2C_ADDRESS,
+            &(BmsRegisterMap::Reset as u32).to_be_bytes(),
+        )?;
+        Ok(())
+    }
+}
 
 #[derive(Debug)]
 #[repr(transparent)]
-pub struct Version(u32);
+pub struct ProtocolVersion(u32);
 
+impl BmsReadable for ProtocolVersion {
+    fn read_from_i2c<I>(i2c_dev: &mut I) -> Result<Self, BmsProtocolError>
+    where
+        Self: Sized,
+        I: I2c<SevenBitAddress>,
+    {
+        let cmd = BmsRegisterMap::ProtocolVersion;
+        let mut version: [u8; 4] = [0x00; 4];
+        i2c_dev.transaction(
+            BMS_I2C_ADDRESS,
+            &mut [
+                Operation::Write(&(cmd as u32).to_be_bytes()),
+                Operation::Read(&mut version),
+            ],
+        )?;
+        Ok(ProtocolVersion(u32::from_be_bytes(version)))
+    }
+}
+
+#[derive(Debug)]
+#[repr(transparent)]
+pub struct FirmwareVersion(u32);
+
+impl BmsReadable for FirmwareVersion {
+    fn read_from_i2c<I>(i2c_dev: &mut I) -> Result<Self, BmsProtocolError>
+    where
+        Self: Sized,
+        I: I2c<SevenBitAddress>,
+    {
+        let cmd = BmsRegisterMap::FirmwareVersion;
+        let mut version: [u8; 4] = [0x00; 4];
+        i2c_dev.transaction(
+            BMS_I2C_ADDRESS,
+            &mut [
+                Operation::Write(&(cmd as u32).to_be_bytes()),
+                Operation::Read(&mut version),
+            ],
+        )?;
+        Ok(FirmwareVersion(u32::from_be_bytes(version)))
+    }
+}
 
 #[derive(Debug)]
 pub struct Config {
     pub capacity_mah: u32,
-    pub v_full_mv: u32, 
+    pub v_full_mv: u32,
     pub v_empty_mv: u32,
 }
 
+impl BmsReadable for Config {
+    fn read_from_i2c<I>(i2c_dev: &mut I) -> Result<Self, BmsProtocolError>
+    where
+        Self: Sized,
+        I: I2c<SevenBitAddress>,
+    {
+        let cmd = BmsRegisterMap::ConfigCapacityMilliAmpereHours;
+        let mut capacity_mah: [u8; 4] = [0x00; 4];
+        let mut v_full_mv: [u8; 4] = [0x00; 4];
+        let mut v_empty_mv: [u8; 4] = [0x00; 4];
+        i2c_dev.transaction(
+            BMS_I2C_ADDRESS,
+            &mut [
+                Operation::Write(&(cmd as u32).to_be_bytes()),
+                Operation::Read(&mut capacity_mah),
+                Operation::Read(&mut v_full_mv),
+                Operation::Read(&mut v_empty_mv),
+            ],
+        )?;
+        Ok(Config {
+            capacity_mah: u32::from_be_bytes(capacity_mah),
+            v_full_mv: u32::from_be_bytes(v_full_mv),
+            v_empty_mv: u32::from_be_bytes(v_empty_mv),
+        })
+    }
+}
+
 #[derive(Debug, Clone, Copy)]
 pub struct BatteryState {
     pub lifetime_capacity_mah: u32,
     pub remaining_capacity_mah: u32,
-    pub current_mv: u16,
+    pub current_mv: u32,
     pub temperature_celcius: i32,
-    pub health_percent: u8
+    pub health_percent: u32,
 }
 
-pub enum BmsCommand {
-    GetVersion,
-    GetConfig,
-    GetBatteryState,
+impl BmsReadable for BatteryState {
+    fn read_from_i2c<I>(i2c_dev: &mut I) -> Result<Self, BmsProtocolError>
+    where
+        Self: Sized,
+        I: I2c<SevenBitAddress>,
+    {
+        let cmd = BmsRegisterMap::BatteryLifetimeCapacityMilliAmpereHours;
+        let mut lifetime_capacity_mah: [u8; 4] = [0x00; 4];
+        let mut remaining_capacity_mah: [u8; 4] = [0x00; 4];
+        let mut current_mv: [u8; 4] = [0x00; 4];
+        let mut temperature_celcius: [u8; 4] = [0x00; 4];
+        let mut health_percent: [u8; 4] = [0x00; 4];
+        i2c_dev.transaction(
+            BMS_I2C_ADDRESS,
+            &mut [
+                Operation::Write(&(cmd as u32).to_be_bytes()),
+                Operation::Read(&mut lifetime_capacity_mah),
+                Operation::Read(&mut remaining_capacity_mah),
+                Operation::Read(&mut current_mv),
+                Operation::Read(&mut temperature_celcius),
+                Operation::Read(&mut health_percent),
+            ],
+        )?;
+        Ok(BatteryState {
+            lifetime_capacity_mah: u32::from_be_bytes(lifetime_capacity_mah),
+            remaining_capacity_mah: u32::from_be_bytes(remaining_capacity_mah),
+            current_mv: u32::from_be_bytes(current_mv),
+            temperature_celcius: i32::from_be_bytes(temperature_celcius),
+            health_percent: u32::from_be_bytes(health_percent),
+        })
+    }
+}
+
+#[repr(u32)]
+#[non_exhaustive]
+pub enum BmsRegisterMap {
+    // software reset register
+    Reset = 0x00000000,
+    // bms protocol revesion as u32 value
+    ProtocolVersion = 0x00000001,
+    // bms firmware revesion as u32 value
+    FirmwareVersion = 0x00000002,
+    // Configuration Values Start Here
+    ConfigCapacityMilliAmpereHours = 0x00010000,
+    ConfigFullMilliVolt = 0x00010004,
+    ConfigEmptyMilliVolt = 0x00010008,
+    // Battery State Values Start Here
+    BatteryLifetimeCapacityMilliAmpereHours = 0x00020000,
+    BatteryRemainingCapacityMilliAmpereHours = 0x00020004,
+    BatteryCurrentVoltageMilliVolt = 0x00020008,
+    BatteryTemperatureCelcius = 0x0002000c,
+    BatteryHealthPercent = 0x00020010,
 }