355 lines
9.0 KiB
C++
355 lines
9.0 KiB
C++
#include "bms.h"
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#include <Arduino.h>
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#include <NimBLEDevice.h>
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static const char* BMS_ADDRESS = "a5:c2:37:2c:05:dc";
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static const char* BMS_SERVICE_UUID = "ff00";
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static const char* BMS_NOTIFY_UUID = "ff01";
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static const char* BMS_WRITE_UUID = "ff02";
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static NimBLEClient* client = nullptr;
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static NimBLERemoteCharacteristic* notifyChar = nullptr;
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static NimBLERemoteCharacteristic* writeChar = nullptr;
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static uint8_t responseBuffer[128];
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static size_t responseLength = 0;
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static bool responseReady = false;
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static unsigned long lastReadAttempt = 0;
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static const unsigned long READ_INTERVAL_MS = 5000;
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BmsData bmsData;
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static BleScanResult bleScanResults[MAX_BLE_SCAN_RESULTS];
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static int bleScanResultCount = 0;
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static uint8_t JBD_STATUS_REQUEST[] = {
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0xDD, 0xA5, 0x03, 0x00, 0xFF, 0xFD, 0x77
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};
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static uint8_t JBD_CELL_REQUEST[] = {
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0xDD, 0xA5, 0x04, 0x00, 0xFF, 0xFC, 0x77
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};
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static uint16_t readU16(const uint8_t* data, int index) {
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return ((uint16_t)data[index] << 8) | data[index + 1];
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}
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static int16_t readS16(const uint8_t* data, int index) {
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return (int16_t)readU16(data, index);
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}
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static void resetResponseBuffer() {
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responseLength = 0;
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responseReady = false;
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memset(responseBuffer, 0, sizeof(responseBuffer));
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}
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static void handleNotify(
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NimBLERemoteCharacteristic* characteristic,
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uint8_t* data,
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size_t length,
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bool isNotify
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) {
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if (responseLength + length > sizeof(responseBuffer)) {
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resetResponseBuffer();
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return;
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}
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memcpy(responseBuffer + responseLength, data, length);
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responseLength += length;
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if (responseLength > 0 && responseBuffer[responseLength - 1] == 0x77) {
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responseReady = true;
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}
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}
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int getBleScanResultCount() {
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return bleScanResultCount;
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}
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const BleScanResult* getBleScanResult(int index) {
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if (index < 0 || index >= bleScanResultCount) {
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return nullptr;
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}
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return &bleScanResults[index];
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}
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int scanBleDevices(uint32_t scanSeconds) {
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Serial.println("BLE: Starting scan...");
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if (client && client->isConnected()) {
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Serial.println("BLE: Disconnecting BMS before scan");
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client->disconnect();
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bmsData.connected = false;
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Serial.println("BLE: Waiting for device advertising...");
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delay(2000);
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}
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bleScanResultCount = 0;
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NimBLEScan* scan = NimBLEDevice::getScan();
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scan->setActiveScan(true);
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scan->setInterval(100);
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scan->setWindow(99);
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NimBLEScanResults results = scan->getResults(scanSeconds, false);
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int resultCount = results.getCount();
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for (int i = 0; i < resultCount && bleScanResultCount < MAX_BLE_SCAN_RESULTS; i++) {
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const NimBLEAdvertisedDevice* device = results.getDevice(i);
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String address = device->getAddress().toString().c_str();
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String name = "";
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if (device->haveName()) {
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name = device->getName().c_str();
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}
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bleScanResults[bleScanResultCount].address = address;
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bleScanResults[bleScanResultCount].name = name;
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bleScanResults[bleScanResultCount].rssi = device->getRSSI();
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bleScanResultCount++;
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}
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scan->clearResults();
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Serial.print("BLE: Devices found: ");
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Serial.println(bleScanResultCount);
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return bleScanResultCount;
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}
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static bool connectBms() {
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if (client && client->isConnected()) {
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bmsData.connected = true;
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return true;
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}
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if (client && !client->isConnected()) {
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Serial.println("BMS: Disconnected, resetting client");
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NimBLEDevice::deleteClient(client);
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client = nullptr;
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notifyChar = nullptr;
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writeChar = nullptr;
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bmsData.connected = false;
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}
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Serial.println("BMS: Connecting...");
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NimBLEAddress address(std::string(BMS_ADDRESS), BLE_ADDR_PUBLIC);
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client = NimBLEDevice::createClient();
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if (!client->connect(address)) {
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Serial.println("BMS: Connect failed");
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bmsData.connected = false;
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NimBLEDevice::deleteClient(client);
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client = nullptr;
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return false;
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}
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NimBLERemoteService* service = client->getService(BMS_SERVICE_UUID);
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if (!service) {
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Serial.println("BMS: Service ff00 not found");
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client->disconnect();
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bmsData.connected = false;
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return false;
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}
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notifyChar = service->getCharacteristic(BMS_NOTIFY_UUID);
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writeChar = service->getCharacteristic(BMS_WRITE_UUID);
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if (!notifyChar || !writeChar) {
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Serial.println("BMS: Characteristics not found");
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client->disconnect();
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bmsData.connected = false;
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return false;
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}
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if (!notifyChar->subscribe(true, handleNotify)) {
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Serial.println("BMS: Notify subscribe failed");
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client->disconnect();
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bmsData.connected = false;
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return false;
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}
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Serial.println("BMS: Connected");
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bmsData.connected = true;
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return true;
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}
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static bool requestPacket(uint8_t* command, size_t commandLength) {
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resetResponseBuffer();
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bool ok = writeChar->writeValue(command, commandLength, false);
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if (!ok) {
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Serial.println("BMS: Write failed");
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bmsData.connected = false;
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if (client) {
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client->disconnect();
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}
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return false;
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}
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unsigned long start = millis();
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while (!responseReady && millis() - start < 2000) {
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delay(10);
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}
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if (!responseReady) {
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Serial.println("BMS: Read timeout");
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return false;
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}
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return true;
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}
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static bool parseBasicInfo() {
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if (responseLength < 40) {
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Serial.println("BMS: Basic response too short");
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return false;
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}
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if (responseBuffer[0] != 0xDD || responseBuffer[1] != 0x03) {
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Serial.println("BMS: Unexpected basic response header");
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return false;
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}
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uint16_t voltageRaw = readU16(responseBuffer, 4);
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int16_t currentRaw = readS16(responseBuffer, 6);
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uint16_t remainingRaw = readU16(responseBuffer, 8);
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uint16_t capacityRaw = readU16(responseBuffer, 10);
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uint16_t cyclesRaw = readU16(responseBuffer, 12);
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uint8_t socRaw = responseBuffer[23];
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uint8_t offset = 24;
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uint8_t cellCount = responseBuffer[offset + 1];
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uint8_t ntcCount = responseBuffer[offset + 2];
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int tempOffset = offset + 3;
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float tempF = 0;
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if (ntcCount > 0 && responseLength > (size_t)(tempOffset + 1)) {
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uint16_t tempRaw = readU16(responseBuffer, tempOffset);
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float tempC = (tempRaw - 2731) / 10.0;
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tempF = tempC * 9.0 / 5.0 + 32.0;
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}
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bmsData.voltage = voltageRaw / 100.0;
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bmsData.current = currentRaw / 100.0;
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bmsData.remainingAh = remainingRaw / 100.0;
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bmsData.capacityAh = capacityRaw / 100.0;
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bmsData.cycleCount = cyclesRaw;
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bmsData.soc = socRaw;
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bmsData.cellCount = cellCount;
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bmsData.ntcCount = ntcCount;
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bmsData.temperatureF = tempF;
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bmsData.valid = true;
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Serial.print("BMS: SOC ");
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Serial.print(bmsData.soc);
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Serial.print("%, V ");
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Serial.print(bmsData.voltage);
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Serial.print(", A ");
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Serial.print(bmsData.current);
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Serial.print(", Ah ");
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Serial.println(bmsData.remainingAh);
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return true;
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}
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static bool parseCellVoltages() {
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if (responseLength < 7) {
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Serial.println("BMS: Cell response too short");
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return false;
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}
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if (responseBuffer[0] != 0xDD || responseBuffer[1] != 0x04) {
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Serial.println("BMS: Unexpected cell response header");
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return false;
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}
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uint8_t payloadLength = responseBuffer[3];
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int cellsReported = payloadLength / 2;
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if (cellsReported > BMS_MAX_CELLS) {
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cellsReported = BMS_MAX_CELLS;
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}
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if (cellsReported <= 0) {
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Serial.println("BMS: No cell voltages reported");
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return false;
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}
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float minV = 99.0;
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float maxV = 0.0;
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for (int i = 0; i < cellsReported; i++) {
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uint16_t mv = readU16(responseBuffer, 4 + (i * 2));
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float volts = mv / 1000.0;
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bmsData.cellVoltages[i] = volts;
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if (volts < minV) {
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minV = volts;
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}
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if (volts > maxV) {
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maxV = volts;
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}
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}
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bmsData.cellCount = cellsReported;
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bmsData.cellMinVoltage = minV;
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bmsData.cellMaxVoltage = maxV;
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bmsData.cellDeltaMv = (int)((maxV - minV) * 1000.0 + 0.5);
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bmsData.cellsValid = true;
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Serial.print("BMS: Cells ");
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Serial.print(cellsReported);
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Serial.print(", min ");
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Serial.print(minV, 3);
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Serial.print("V, max ");
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Serial.print(maxV, 3);
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Serial.print("V, delta ");
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Serial.print(bmsData.cellDeltaMv);
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Serial.println("mV");
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return true;
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}
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void initBms() {
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NimBLEDevice::init("XterraESP32");
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NimBLEDevice::setPower(ESP_PWR_LVL_P9);
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resetResponseBuffer();
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}
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void updateBms() {
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if (millis() - lastReadAttempt < READ_INTERVAL_MS) {
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return;
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}
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lastReadAttempt = millis();
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if (!connectBms()) {
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return;
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}
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if (requestPacket(JBD_STATUS_REQUEST, sizeof(JBD_STATUS_REQUEST))) {
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parseBasicInfo();
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}
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delay(100);
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if (requestPacket(JBD_CELL_REQUEST, sizeof(JBD_CELL_REQUEST))) {
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parseCellVoltages();
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}
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}
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