Merge pull request #1277 from dalathegreat/feature/sofar-multiple-packs

Feature: Sofar CAN protocol ⚡

Software/src/communication/nvm/comm_nvm.cpp

@@ -70,6 +70,10 @@ void init_stored_settings() {
     datalayer.battery.settings.max_user_set_discharge_voltage_dV = temp;
   }
   datalayer.battery.settings.user_set_voltage_limits_active = settings.getBool("USEVOLTLIMITS", false);
+  temp = settings.getUInt("SOFAR_ID", false);
+  if (temp < 16) {
+    datalayer.battery.settings.sofar_user_specified_battery_id = temp;
+  }
 
 #ifdef COMMON_IMAGE
   user_selected_battery_type = (BatteryType)settings.getUInt("BATTTYPE", (int)BatteryType::None);
@@ -135,6 +139,9 @@ void store_settings() {
   if (!settings.putUInt("TARGETDISCHVOLT", datalayer.battery.settings.max_user_set_discharge_voltage_dV)) {
     set_event(EVENT_PERSISTENT_SAVE_INFO, 11);
   }
+  if (!settings.putUInt("SOFAR_ID", datalayer.battery.settings.sofar_user_specified_battery_id)) {
+    set_event(EVENT_PERSISTENT_SAVE_INFO, 12);
+  }
 
   settings.end();  // Close preferences handle
 }

Software/src/datalayer/datalayer.h

@@ -162,6 +162,9 @@ typedef struct {
   /* Maximum voltage for entire battery pack during forced balancing */
   uint16_t balancing_max_pack_voltage_dV = 3940;
 
+  /** Sofar CAN Battery ID (0-15) used to parallel multiple packs */
+  uint8_t sofar_user_specified_battery_id = 0;
+
 } DATALAYER_BATTERY_SETTINGS_TYPE;
 
 typedef struct {

Software/src/devboard/webserver/settings_html.cpp

@@ -149,6 +149,9 @@ String settings_processor(const String& var) {
     if (inverter) {
       content += "<h4 style='color: white;'>Inverter interface: <span id='Inverter'>" +
                  String(inverter->interface_name()) + "</span></h4>";
+      content += "<h4 style='color: white;'>Sofar battery ID: " +
+                 String(datalayer.battery.settings.sofar_user_specified_battery_id) +
+                 " </span> <button onclick='editSofarID()'>Edit</button></h4>";
     }
 
     if (shunt) {
@@ -284,6 +287,13 @@ String settings_processor(const String& var) {
         "function editPassword(){var value=prompt('Enter new password:');if(value!==null){var xhr=new "
         "XMLHttpRequest();xhr.onload=editComplete;xhr.onerror=editError;xhr.open('GET','/"
         "updatePassword?value='+encodeURIComponent(value),true);xhr.send();}}";
+    content +=
+        "function editSofarID(){var value=prompt('For double battery setups. Which battery ID should this emulator "
+        "send? Remember to reboot after configuring this! Enter new value between "
+        "(0-15):');if(value!==null){if(value>=0&&value<=15){var xhr=new "
+        "XMLHttpRequest();xhr.onload=editComplete;xhr.onerror=editError;xhr.open('GET','/"
+        "updateSofarID?value='+value,true);xhr.send();}else{alert('Invalid value. Please enter a value between 0 "
+        "and 15.');}}}";
     content +=
         "function editWh(){var value=prompt('How much energy the battery can store. Enter new Wh value "
         "(1-120000):');if(value!==null){if(value>=1&&value<=120000){var xhr=new "

Software/src/devboard/webserver/webserver.cpp

@@ -487,6 +487,20 @@ void init_webserver() {
     }
   });
 
+  // Route for editing Sofar ID
+  server.on("/updateSofarID", HTTP_GET, [](AsyncWebServerRequest* request) {
+    if (WEBSERVER_AUTH_REQUIRED && !request->authenticate(http_username, http_password))
+      return request->requestAuthentication();
+    if (request->hasParam("value")) {
+      String value = request->getParam("value")->value();
+      datalayer.battery.settings.sofar_user_specified_battery_id = value.toInt();
+      store_settings();
+      request->send(200, "text/plain", "Updated successfully");
+    } else {
+      request->send(400, "text/plain", "Bad Request");
+    }
+  });
+
   // Route for editing Wh
   server.on("/updateBatterySize", HTTP_GET, [](AsyncWebServerRequest* request) {
     if (WEBSERVER_AUTH_REQUIRED && !request->authenticate(http_username, http_password))

Software/src/inverter/SOFAR-CAN.cpp

@@ -32,19 +32,67 @@ void SofarInverter::
   SOFAR_356.data.u8[3] = (datalayer.battery.status.current_dA >> 8);
   SOFAR_356.data.u8[4] = (datalayer.battery.status.temperature_max_dC & 0x00FF);
   SOFAR_356.data.u8[5] = (datalayer.battery.status.temperature_max_dC >> 8);
+
+  // frame 0x35E – Manufacturer Name ASCII
+  memset(SOFAR_35E.data.u8, 0, 8);
+  strncpy((char*)SOFAR_35E.data.u8, BatteryType, 8);
+
+  //Gets automatically rescaled with SOC scaling. Calculated with max design voltage, better would be to calculate with nominal voltage
+  calculated_capacity_AH =
+      (datalayer.battery.info.reported_total_capacity_Wh / (datalayer.battery.info.max_design_voltage_dV * 0.1));
+  //Battery Nominal Capacity
+  SOFAR_35F.data.u8[4] = calculated_capacity_AH & 0x00FF;
+  SOFAR_35F.data.u8[5] = (calculated_capacity_AH >> 8);
+
+  // Charge and discharge consent dependent on SoC with hysteresis at 99% soc
+  //SoC deception only to CAN (we do not touch datalayer)
+  uint16_t spoofed_soc = datalayer.battery.status.reported_soc;
+  if (spoofed_soc >= 10000) {
+    spoofed_soc = 9900;  // limit to 99%
+  }
+
+  // Frame 0x355 – SoC and SoH
+  SOFAR_355.data.u8[0] = spoofed_soc / 100;
+  SOFAR_355.data.u8[2] = datalayer.battery.status.soh_pptt / 100;
+
+  // Set charge and discharge consent flags
+  uint8_t soc_percent = spoofed_soc / 100;
+  uint8_t enable_flags = 0x00;
+
+  if (soc_percent <= 1) {
+    enable_flags = 0x02;  // Only charging allowed
+  } else if (soc_percent >= 100) {
+    enable_flags = 0x01;  // Only discharge allowed
+  } else {
+    enable_flags = 0x03;  // Both charge and discharge allowed
+  }
+
+  // Frame 0x30F – operation mode
+  SOFAR_30F.data.u8[0] = 0x00;  // Normal mode
+  SOFAR_30F.data.u8[1] = enable_flags;
 }
 
 void SofarInverter::map_can_frame_to_variable(CAN_frame rx_frame) {
-  switch (rx_frame.ID) {  //In here we need to respond to the inverter. TODO: make logic
+  switch (rx_frame.ID) {
     case 0x605:
-      datalayer.system.status.CAN_inverter_still_alive = CAN_STILL_ALIVE;
-      //frame1_605 = rx_frame.data.u8[1];
-      //frame3_605 = rx_frame.data.u8[3];
-      break;
     case 0x705:
       datalayer.system.status.CAN_inverter_still_alive = CAN_STILL_ALIVE;
-      //frame1_705 = rx_frame.data.u8[1];
-      //frame3_705 = rx_frame.data.u8[3];
+      switch (rx_frame.data.u8[0]) {
+        case 0x00:
+          transmit_can_frame(&SOFAR_683, can_config.inverter);
+          break;
+        case 0x01:
+          transmit_can_frame(&SOFAR_684, can_config.inverter);
+          break;
+        case 0x02:
+          transmit_can_frame(&SOFAR_685, can_config.inverter);
+          break;
+        case 0x03:
+          transmit_can_frame(&SOFAR_690, can_config.inverter);
+          break;
+        default:
+          break;
+      }
       break;
     default:
       break;
@@ -68,6 +116,33 @@ void SofarInverter::transmit_can(unsigned long currentMillis) {
 }
 
 void SofarInverter::setup(void) {  // Performs one time setup at startup over CAN bus
+  // Dymanically set CAN ID according to which battery index we are on
+  uint16_t base_offset = (datalayer.battery.settings.sofar_user_specified_battery_id << 12);
+  auto init_frame = [&](CAN_frame& frame, uint16_t base_id) {
+    frame.FD = false;
+    frame.ext_ID = true;
+    frame.DLC = 8;
+    frame.ID = base_id + base_offset;
+    memset(frame.data.u8, 0, 8);
+  };
+
+  init_frame(SOFAR_351, 0x351);
+  init_frame(SOFAR_355, 0x355);
+  init_frame(SOFAR_356, 0x356);
+  init_frame(SOFAR_30F, 0x30F);
+  init_frame(SOFAR_359, 0x359);
+  init_frame(SOFAR_35E, 0x35E);
+  init_frame(SOFAR_35F, 0x35F);
+  init_frame(SOFAR_35A, 0x35A);
+
+  init_frame(SOFAR_683, 0x683);
+  init_frame(SOFAR_684, 0x684);
+  init_frame(SOFAR_685, 0x685);
+  init_frame(SOFAR_690, 0x690);
+
   strncpy(datalayer.system.info.inverter_protocol, Name, 63);
   datalayer.system.info.inverter_protocol[63] = '\0';
+  String tempStr(datalayer.battery.settings.sofar_user_specified_battery_id);
+  strncpy(datalayer.system.info.inverter_brand, tempStr.c_str(), 7);
+  datalayer.system.info.inverter_brand[7] = '\0';
 }

Software/src/inverter/SOFAR-CAN.h

@@ -14,10 +14,12 @@ class SofarInverter : public CanInverterProtocol {
   void update_values();
   void transmit_can(unsigned long currentMillis);
   void map_can_frame_to_variable(CAN_frame rx_frame);
-  static constexpr const char* Name = "Sofar BMS (Extended Frame) over CAN bus";
+  static constexpr const char* Name = "Sofar BMS (Extended) via CAN, Battery ID";
 
  private:
   unsigned long previousMillis100 = 0;  // will store last time a 100ms CAN Message was send
+  uint16_t calculated_capacity_AH = 0;  // Pack Capacity in AH (Updates based on battery stats)
+  const char* BatteryType = "BATxEMU";  // Manufacturer name in ASCII
 
   //Actual content messages
   //Note that these are technically extended frames. If more batteries are put in parallel,the first battery sends 0x351 the next battery sends 0x1351 etc. 16 batteries in parallel supported