From b5121ce7f40af51afad5370461553f84aef68fe6 Mon Sep 17 00:00:00 2001
From: Alex Janka <alex@alexjanka.com>
Date: Mon, 13 Jan 2025 12:14:53 +1100
Subject: [PATCH] ccs: tristar: parse dip switches

---
 .../src/controller/tristar.rs                 | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)

diff --git a/charge-controller-supervisor/src/controller/tristar.rs b/charge-controller-supervisor/src/controller/tristar.rs
index 2148da4..5b533d6 100644
--- a/charge-controller-supervisor/src/controller/tristar.rs
+++ b/charge-controller-supervisor/src/controller/tristar.rs
@@ -426,6 +426,7 @@ pub struct TristarState {
     pub alarms_daily: Alarms,
     pub faults_daily: Faults,
     pub flags_daily: DailyFlags,
+    pub dip_switches: DipSwitch,
 }
 
 fn signed(val: u16) -> i16 {
@@ -466,6 +467,9 @@ impl TristarState {
             ),
             faults_daily: Faults::from_bits_retain(ram[TristarRamAddress::FaultDaily]),
             flags_daily: DailyFlags::from_bits_retain(ram[TristarRamAddress::FlagsDaily]),
+            dip_switches: DipSwitch::parse_byte(
+                (ram[TristarRamAddress::Dip] & 0xFF).try_into().unwrap_or(0),
+            ),
         }
     }
 }
@@ -536,6 +540,99 @@ impl Alarms {
     }
 }
 
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub struct DipSwitch {
+    sw1_reserved: bool,
+    system_voltage: SystemVoltage,
+    battery_config: BatteryConfig,
+    battery_equalization: BatteryEqualization,
+    ethernet_security: bool,
+}
+
+trait Bit {
+    fn bit(&self, num: u8) -> bool;
+}
+
+impl Bit for u8 {
+    fn bit(&self, num: u8) -> bool {
+        ((*self >> num) & 0b1) != 0
+    }
+}
+
+impl DipSwitch {
+    fn parse_byte(value: u8) -> Self {
+        let sw1_reserved = value.bit(0);
+        let system_voltage = SystemVoltage::from_dip(value.bit(1), value.bit(2));
+        let battery_config = BatteryConfig::from_dip(value.bit(3), value.bit(4), value.bit(5));
+        let battery_equalization = if value.bit(6) {
+            BatteryEqualization::Automatic
+        } else {
+            BatteryEqualization::Manual
+        };
+        let ethernet_security = value.bit(7);
+
+        Self {
+            sw1_reserved,
+            system_voltage,
+            battery_config,
+            battery_equalization,
+            ethernet_security,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+enum SystemVoltage {
+    Auto,
+    V12,
+    V24,
+    V48,
+}
+
+impl SystemVoltage {
+    const fn from_dip(switch2: bool, switch3: bool) -> Self {
+        match (switch2, switch3) {
+            (false, false) => Self::Auto,
+            (false, true) => Self::V12,
+            (true, false) => Self::V24,
+            (true, true) => Self::V48,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+enum BatteryConfig {
+    Gel,
+    Sealed2,
+    Sealed3,
+    AgmFlooded,
+    Flooded5,
+    Flooded6,
+    Flooded7,
+    Custom,
+}
+
+impl BatteryConfig {
+    const fn from_dip(switch4: bool, switch5: bool, switch6: bool) -> Self {
+        match (switch4, switch5, switch6) {
+            (false, false, false) => Self::Gel,
+            (false, false, true) => Self::Sealed2,
+            (false, true, false) => Self::Sealed3,
+            (false, true, true) => Self::AgmFlooded,
+            (true, false, false) => Self::Flooded5,
+            (true, false, true) => Self::Flooded6,
+            (true, true, false) => Self::Flooded7,
+            (true, true, true) => Self::Custom,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+enum BatteryEqualization {
+    Manual,
+    Automatic,
+}
+
 #[derive(Debug, Clone, Copy, Serialize, Deserialize)]
 pub enum ChargeState {
     Start,