Add BMS controls (#44)

Author: syssi

.gitignore

@@ -1,5 +1,5 @@
 .idea/
-secret.yaml
+secrets.yaml
 .esphome/
 **/.pioenvs/
 **/.piolibdeps/

components/jk_bms/jk_bms.cpp

@@ -9,6 +9,7 @@ static const char *const TAG = "jk_bms";
 
 static const uint8_t FUNCTION_READ_ALL = 0x06;
 static const uint8_t ADDRESS_READ_ALL = 0x00;
+static const uint8_t WRITE_REGISTER = 0x02;
 
 static const uint8_t ERRORS_SIZE = 14;
 static const char *const ERRORS[ERRORS_SIZE] = {
@@ -346,6 +347,8 @@ void JkBms::on_status_data_(const std::vector<uint8_t> &data) {
   // 00 00 00 00 68 00 00 54 D1: End of frame
 }
 
+void JkBms::write_register(uint8_t address, uint8_t value) { this->send(WRITE_REGISTER, address, value); }
+
 void JkBms::update() {
   this->read_registers(FUNCTION_READ_ALL, ADDRESS_READ_ALL);
 

components/jk_bms/jk_bms.h

@@ -206,6 +206,8 @@ class JkBms : public PollingComponent, public jk_modbus::JkModbusDevice {
 
   void update() override;
 
+  void write_register(uint8_t address, uint8_t value);
+
  protected:
   sensor::Sensor *min_cell_voltage_sensor_;
   sensor::Sensor *max_cell_voltage_sensor_;

components/jk_bms/switch/jk_switch.cpp

@@ -8,10 +8,7 @@ namespace jk_bms {
 static const char *const TAG = "jk_bms.switch";
 
 void JkSwitch::dump_config() { LOG_SWITCH("", "JkBms Switch", this); }
-void JkSwitch::write_state(bool state) {
-  // @FIXME
-  // this->parent_->write_register(this->holding_register_, (uint16_t) state);
-}
+void JkSwitch::write_state(bool state) { this->parent_->write_register(this->holding_register_, (uint8_t) state); }
 
 }  // namespace jk_bms
 }  // namespace esphome

components/jk_bms/switch/jk_switch.h

@@ -11,15 +11,15 @@ class JkBms;
 class JkSwitch : public switch_::Switch, public Component {
  public:
   void set_parent(JkBms *parent) { this->parent_ = parent; };
-  void set_holding_register(uint16_t holding_register) { this->holding_register_ = holding_register; };
+  void set_holding_register(uint8_t holding_register) { this->holding_register_ = holding_register; };
   void dump_config() override;
   void loop() override {}
   float get_setup_priority() const override { return setup_priority::DATA; }
 
  protected:
   void write_state(bool state) override;
   JkBms *parent_;
-  uint16_t holding_register_;
+  uint8_t holding_register_;
 };
 
 }  // namespace jk_bms

components/jk_modbus/jk_modbus.cpp

@@ -91,19 +91,33 @@ float JkModbus::get_setup_priority() const {
   // After UART bus
   return setup_priority::BUS - 1.0f;
 }
-void JkModbus::send(uint8_t address, uint8_t function, uint16_t start_address, uint16_t register_count) {
-  uint8_t frame[8];
-  frame[0] = address;
-  frame[1] = function;
-  frame[2] = start_address >> 8;
-  frame[3] = start_address >> 0;
-  frame[4] = register_count >> 8;
-  frame[5] = register_count >> 0;
-  auto crc = chksum(frame, 6);
-  frame[6] = crc >> 8;
-  frame[7] = crc >> 0;
-
-  this->write_array(frame, 8);
+void JkModbus::send(uint8_t function, uint8_t address, uint8_t value) {
+  uint8_t frame[22];
+  frame[0] = 0x4E;      // start sequence
+  frame[1] = 0x57;      // start sequence
+  frame[2] = 0x00;      // data length lb
+  frame[3] = 0x14;      // data length hb
+  frame[4] = 0x00;      // bms terminal number
+  frame[5] = 0x00;      // bms terminal number
+  frame[6] = 0x00;      // bms terminal number
+  frame[7] = 0x00;      // bms terminal number
+  frame[8] = function;  // command word: 0x01 (activation), 0x02 (write), 0x03 (read), 0x05 (password), 0x06 (read all)
+  frame[9] = 0x02;      // frame source: 0x00 (bms), 0x01 (bluetooth), 0x02 (gps), 0x03 (computer)
+  frame[10] = 0x02;     // frame type: 0x00 (read data), 0x01 (reply frame), 0x02 (BMS active upload)
+  frame[11] = address;  // register: 0x00 (read all registers), 0x8E...0xBF (holding registers)
+  frame[12] = value;    // data
+  frame[13] = 0x00;     // record number
+  frame[14] = 0x00;     // record number
+  frame[15] = 0x00;     // record number
+  frame[16] = 0x00;     // record number
+  frame[17] = 0x68;     // end sequence
+  auto crc = chksum(frame, 17);
+  frame[18] = 0x00;  // crc unused
+  frame[19] = 0x00;  // crc unused
+  frame[20] = crc >> 8;
+  frame[21] = crc >> 0;
+
+  this->write_array(frame, 22);
   this->flush();
 }
 

components/jk_modbus/jk_modbus.h

@@ -20,7 +20,7 @@ class JkModbus : public uart::UARTDevice, public Component {
 
   float get_setup_priority() const override;
 
-  void send(uint8_t address, uint8_t function, uint16_t start_address, uint16_t register_count);
+  void send(uint8_t function, uint8_t address, uint8_t value);
   void read_registers(uint8_t function, uint8_t address);
 
  protected:
@@ -37,9 +37,7 @@ class JkModbusDevice {
   void set_address(uint8_t address) { address_ = address; }
   virtual void on_jk_modbus_data(const uint8_t &function, const std::vector<uint8_t> &data) = 0;
 
-  void send(uint8_t function, uint16_t start_address, uint16_t register_count) {
-    this->parent_->send(this->address_, function, start_address, register_count);
-  }
+  void send(int8_t function, uint8_t address, uint8_t value) { this->parent_->send(function, address, value); }
   void read_registers(uint8_t function, uint8_t address) { this->parent_->read_registers(function, address); }
 
  protected:

test.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+esphome -s external_components_source components ${1:-run} esp32-example-faker.yaml