AC charger: make CAN controller frequency configurable

Author: schlimmchen

include/Configuration.h

@@ -177,6 +177,7 @@ struct CONFIG_T {
     uint8_t Battery_JkBmsPollingInterval;
 
     bool Huawei_Enabled;
+    uint32_t Huawei_CAN_Controller_Frequency;
     bool Huawei_Auto_Power_Enabled;
     float Huawei_Auto_Power_Voltage_Limit;
     float Huawei_Auto_Power_Enable_Voltage_Limit;

include/Huawei_can.h

@@ -90,7 +90,8 @@ typedef struct RectifierParameters {
 
 class HuaweiCanCommClass {
 public:
-    bool init(uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t huawei_clk, uint8_t huawei_irq, uint8_t huawei_cs);
+    bool init(uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t huawei_clk,
+            uint8_t huawei_irq, uint8_t huawei_cs, uint32_t frequency);
     void loop();
     bool gotNewRxDataFrame(bool clear);
     uint8_t  getErrorCode(bool clear);

include/defaults.h

@@ -137,6 +137,7 @@
 #define BATTERY_JKBMS_POLLING_INTERVAL 5
 
 #define HUAWEI_ENABLED false
+#define HUAWEI_CAN_CONTROLLER_FREQUENCY 8000000UL
 #define HUAWEI_AUTO_POWER_VOLTAGE_LIMIT 42.0
 #define HUAWEI_AUTO_POWER_ENABLE_VOLTAGE_LIMIT 42.0
 #define HUAWEI_AUTO_POWER_LOWER_POWER_LIMIT 150

src/Configuration.cpp

@@ -190,6 +190,7 @@ bool ConfigurationClass::write()
 
     JsonObject huawei = doc.createNestedObject("huawei");
     huawei["enabled"] = config.Huawei_Enabled;
+    huawei["can_controller_frequency"] = config.Huawei_CAN_Controller_Frequency;
     huawei["auto_power_enabled"] = config.Huawei_Auto_Power_Enabled;
     huawei["voltage_limit"] = config.Huawei_Auto_Power_Voltage_Limit;
     huawei["enable_voltage_limit"] = config.Huawei_Auto_Power_Enable_Voltage_Limit;
@@ -413,6 +414,7 @@ bool ConfigurationClass::read()
 
     JsonObject huawei = doc["huawei"];
     config.Huawei_Enabled = huawei["enabled"] | HUAWEI_ENABLED;
+    config.Huawei_CAN_Controller_Frequency = huawei["can_controller_frequency"] | HUAWEI_CAN_CONTROLLER_FREQUENCY;
     config.Huawei_Auto_Power_Enabled = huawei["auto_power_enabled"] | false;
     config.Huawei_Auto_Power_Voltage_Limit = huawei["voltage_limit"] | HUAWEI_AUTO_POWER_VOLTAGE_LIMIT;
     config.Huawei_Auto_Power_Enable_Voltage_Limit =  huawei["enable_voltage_limit"] | HUAWEI_AUTO_POWER_ENABLE_VOLTAGE_LIMIT;

src/Huawei_can.cpp

@@ -30,7 +30,8 @@ void HuaweiCanCommunicationTask(void* parameter) {
   }
 }
 
-bool HuaweiCanCommClass::init(uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t huawei_clk, uint8_t huawei_irq, uint8_t huawei_cs) {
+bool HuaweiCanCommClass::init(uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t huawei_clk,
+        uint8_t huawei_irq, uint8_t huawei_cs, uint32_t frequency) {
     SPI = new SPIClass(HSPI);
     SPI->begin(huawei_clk, huawei_miso, huawei_mosi, huawei_cs);
     pinMode(huawei_cs, OUTPUT);
@@ -39,8 +40,14 @@ bool HuaweiCanCommClass::init(uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t
     pinMode(huawei_irq, INPUT_PULLUP);
     _huaweiIrq = huawei_irq;
 
+    auto mcp_frequency = MCP_8MHZ;
+    if (16000000UL == frequency) { mcp_frequency = MCP_16MHZ; }
+    else if (8000000UL != frequency) {
+        MessageOutput.printf("Huawei CAN: unknown frequency %d Hz, using 8 MHz\r\n", mcp_frequency);
+    }
+
     _CAN = new MCP_CAN(SPI, huawei_cs);
-    if (!_CAN->begin(MCP_STDEXT, CAN_125KBPS, MCP_8MHZ) == CAN_OK) {
+    if (!_CAN->begin(MCP_STDEXT, CAN_125KBPS, mcp_frequency) == CAN_OK) {
         return false;
     }
 
@@ -198,7 +205,7 @@ void HuaweiCanClass::init(uint8_t huawei_miso, uint8_t huawei_mosi, uint8_t huaw
         return;
     }
 
-    if (!HuaweiCanComm.init(huawei_miso, huawei_mosi, huawei_clk, huawei_irq, huawei_cs)) {
+    if (!HuaweiCanComm.init(huawei_miso, huawei_mosi, huawei_clk, huawei_irq, huawei_cs, config.Huawei_CAN_Controller_Frequency)) {
       MessageOutput.println("[HuaweiCanClass::init] Error Initializing Huawei CAN communication...");
       return;
     };

src/WebApi_Huawei.cpp

@@ -190,6 +190,7 @@ void WebApiHuaweiClass::onAdminGet(AsyncWebServerRequest* request)
     const CONFIG_T& config = Configuration.get();
 
     root[F("enabled")] = config.Huawei_Enabled;
+    root[F("can_controller_frequency")] = config.Huawei_CAN_Controller_Frequency;
     root[F("auto_power_enabled")] = config.Huawei_Auto_Power_Enabled;
     root[F("voltage_limit")] = static_cast<int>(config.Huawei_Auto_Power_Voltage_Limit * 100) / 100.0;
     root[F("enable_voltage_limit")] = static_cast<int>(config.Huawei_Auto_Power_Enable_Voltage_Limit * 100) / 100.0;
@@ -240,6 +241,7 @@ void WebApiHuaweiClass::onAdminPost(AsyncWebServerRequest* request)
     }
 
     if (!(root.containsKey("enabled")) ||
+        !(root.containsKey("can_controller_frequency")) ||
         !(root.containsKey("auto_power_enabled")) ||
         !(root.containsKey("voltage_limit")) ||
         !(root.containsKey("lower_power_limit")) ||
@@ -253,6 +255,7 @@ void WebApiHuaweiClass::onAdminPost(AsyncWebServerRequest* request)
 
     CONFIG_T& config = Configuration.get();
     config.Huawei_Enabled = root[F("enabled")].as<bool>();
+    config.Huawei_CAN_Controller_Frequency = root[F("can_controller_frequency")].as<uint32_t>();
     config.Huawei_Auto_Power_Enabled = root[F("auto_power_enabled")].as<bool>();
     config.Huawei_Auto_Power_Voltage_Limit = root[F("voltage_limit")].as<float>();
     config.Huawei_Auto_Power_Enable_Voltage_Limit = root[F("enable_voltage_limit")].as<float>();
@@ -267,6 +270,14 @@ void WebApiHuaweiClass::onAdminPost(AsyncWebServerRequest* request)
     response->setLength();
     request->send(response);
 
+    // TODO(schlimmchen): HuaweiCan has no real concept of the fact that the
+    // config might change. at least not regarding CAN parameters. until that
+    // changes, the ESP must restart for configuration changes to take effect.
+    yield();
+    delay(1000);
+    yield();
+    ESP.restart();
+
     const PinMapping_t& pin = PinMapping.get();
     // Properly turn this on
     if (config.Huawei_Enabled) {

webapp/src/locales/de.json

@@ -777,6 +777,7 @@
         "ChargerSettings": "AC Ladegerät Einstellungen",
         "Configuration": "AC Ladegerät Konfiguration",
         "EnableHuawei": "Huawei R4850G2 an CAN Bus Interface aktiv",
+        "CanControllerFrequency": "Frequenz des Quarzes am CAN Controller",
         "EnableAutoPower": "Automatische Leistungssteuerung",
         "Limits": "Limits",
         "VoltageLimit": "Ladespannungslimit",

webapp/src/locales/en.json

@@ -787,6 +787,7 @@
         "ChargerSettings": "AC Charger Settings",
         "Configuration": "AC Charger Configuration",
         "EnableHuawei": "Enable Huawei R4850G2 on CAN Bus Interface",
+        "CanControllerFrequency": "CAN controller quarz frequency",
         "EnableAutoPower": "Automatic power control",
         "Limits": "Limits",
         "VoltageLimit": "Charge Voltage limit",

webapp/src/locales/fr.json

@@ -743,6 +743,7 @@
         "ChargerSettings": "AC Charger Settings",
         "Configuration": "AC Charger Configuration",
         "EnableHuawei": "Enable Huawei R4850G2 on CAN Bus Interface",
+        "CanControllerFrequency": "CAN controller quarz frequency",
         "EnableAutoPower": "Automatic power control",
         "Limits": "Limits",
         "VoltageLimit": "Charge Voltage limit",

webapp/src/types/AcChargerConfig.ts

@@ -1,5 +1,6 @@
 export interface AcChargerConfig {
   enabled: boolean;
+  can_controller_frequency: number;
   auto_power_enabled: boolean;
   voltage_limit: number;
   enable_voltage_limit: number;

webapp/src/views/AcChargerAdminView.vue

@@ -9,6 +9,20 @@
                 <InputElement :label="$t('acchargeradmin.EnableHuawei')"
                               v-model="acChargerConfigList.enabled"
                               type="checkbox" wide/>
+
+                <div class="row mb-3" v-show="acChargerConfigList.enabled">
+                    <label class="col-sm-4 col-form-label">
+                        {{ $t('acchargeradmin.CanControllerFrequency') }}
+                    </label>
+                    <div class="col-sm-8">
+                        <select class="form-select" v-model="acChargerConfigList.can_controller_frequency">
+                            <option v-for="frequency in frequencyTypeList" :key="frequency.key" :value="frequency.value">
+                                {{ frequency.key }} MHz
+                            </option>
+                        </select>
+                    </div>
+                </div>
+
                 <InputElement v-show="acChargerConfigList.enabled"
                               :label="$t('acchargeradmin.EnableAutoPower')"
                               v-model="acChargerConfigList.auto_power_enabled"
@@ -89,6 +103,10 @@ export default defineComponent({
             alertMessage: "",
             alertType: "info",
             showAlert: false,
+            frequencyTypeList: [
+                { key:  8, value:  8000000 },
+                { key: 16, value: 16000000 },
+            ],
         };
     },
     created() {