mirror of
https://github.com/dalathegreat/Battery-Emulator.git
synced 2025-10-04 10:19:29 +02:00
211 lines
9.4 KiB
C++
211 lines
9.4 KiB
C++
#include "SOLAX-CAN.h"
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/* Do not change code below unless you are sure what you are doing */
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static uint16_t max_charge_rate_amp = 0;
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static uint16_t max_discharge_rate_amp = 0;
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static uint16_t temperature_average = 0;
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static int STATE = BATTERY_ANNOUNCE;
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static unsigned long LastFrameTime = 0;
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static const uint8_t BatteryModuleFirmware = 2;
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//CAN message translations from this amazing repository: https://github.com/rand12345/solax_can_bus
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CAN_frame_t SOLAX_1801 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1801,.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}};
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CAN_frame_t SOLAX_1872 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1872,.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}; //BMS_Limits
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CAN_frame_t SOLAX_1873 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1873,.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}; //BMS_PackData
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CAN_frame_t SOLAX_1874 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1874,.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}; //BMS_CellData
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CAN_frame_t SOLAX_1875 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1875,.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}; //BMS_Status
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CAN_frame_t SOLAX_1876 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1876,.data = {0x0, 0x0, 0xE2, 0x0C, 0x0, 0x0, 0xD7, 0x0C}}; //BMS_PackTemps
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CAN_frame_t SOLAX_1877 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1877,.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}};
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CAN_frame_t SOLAX_1878 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1878,.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}; //BMS_PackStats
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CAN_frame_t SOLAX_1879 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1879,.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}};
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CAN_frame_t SOLAX_1881 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1881,.data = {0x00, 0x36, 0x53, 0x42, 0x4D, 0x53, 0x46, 0x41}}; // E.g.: 0 6 S B M S F A
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CAN_frame_t SOLAX_1882 = {.FIR = {.B = {.DLC = 8,.FF = CAN_frame_ext,}},.MsgID = 0x1882,.data = {0x00, 0x32, 0x33, 0x41, 0x42, 0x30, 0x35, 0x32}}; // E.g.: 0 2 3 A B 0 5 2
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CAN_frame_t SOLAX_100A001 = {.FIR = {.B = {.DLC = 0,.FF = CAN_frame_ext,}},.MsgID = 0x100A001,.data = {}};
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// __builtin_bswap64 needed to convert to ESP32 little endian format
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// Byte[4] defines the requested contactor state: 1 = Closed , 0 = Open
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#define Contactor_Open_Payload __builtin_bswap64(0x0200010000000000)
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#define Contactor_Close_Payload __builtin_bswap64(0x0200010001000000)
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void CAN_WriteFrame(CAN_frame_t* tx_frame)
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{
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if(dual_can){
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CANMessage MCP2515Frame; //Struct with ACAN2515 library format, needed to use the MCP2515 library
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MCP2515Frame.id = tx_frame->MsgID;
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MCP2515Frame.ext = tx_frame->FIR.B.FF;
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MCP2515Frame.len = tx_frame->FIR.B.DLC;
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for (uint8_t i=0 ; i<MCP2515Frame.len ; i++) {
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MCP2515Frame.data[i] = tx_frame->data.u8[i];
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}
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can.tryToSend(MCP2515Frame);
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}
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else{
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ESP32Can.CANWriteFrame(tx_frame);
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}
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}
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void update_values_can_solax()
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{ //This function maps all the values fetched from battery CAN to the correct CAN messages
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// If not receiveing any communication from the inverter, open contactors and return to battery announce state
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if (millis() - LastFrameTime >= SolaxTimeout)
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{
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inverterAllowsContactorClosing = 0;
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STATE = BATTERY_ANNOUNCE;
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}
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//Calculate the required values
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temperature_average = ((temperature_max + temperature_min)/2);
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//max_target_charge_power (30000W max)
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if(SOC > 9999) //99.99%
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{ //Additional safety incase SOC% is 100, then do not charge battery further
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max_charge_rate_amp = 0;
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}
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else
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{ //We can pass on the battery charge rate (in W) to the inverter (that takes A)
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if(max_target_charge_power >= 30000)
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{
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max_charge_rate_amp = 75; //Incase battery can take over 30kW, cap value to 75A
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}
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else
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{ //Calculate the W value into A
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max_charge_rate_amp = (max_target_charge_power/(battery_voltage*0.1)); // P/U = I
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}
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}
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//max_target_discharge_power (30000W max)
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if(SOC < 100) //1.00%
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{ //Additional safety incase SOC% is below 1, then do not charge battery further
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max_discharge_rate_amp = 0;
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}
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else
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{ //We can pass on the battery discharge rate to the inverter
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if(max_target_discharge_power >= 30000)
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{
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max_discharge_rate_amp = 75; //Incase battery can be charged with over 30kW, cap value to 75A
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}
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else
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{ //Calculate the W value into A
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max_discharge_rate_amp = (max_target_discharge_power/(battery_voltage*0.1)); // P/U = I
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}
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}
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//Put the values into the CAN messages
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//BMS_Limits
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SOLAX_1872.data.u8[0] = (uint8_t) max_volt_solax_can; //Todo, scaling OK?
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SOLAX_1872.data.u8[1] = (max_volt_solax_can >> 8);
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SOLAX_1872.data.u8[2] = (uint8_t) min_volt_solax_can; //Todo, scaling OK?
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SOLAX_1872.data.u8[3] = (min_volt_solax_can >> 8);
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SOLAX_1872.data.u8[4] = (uint8_t) (max_charge_rate_amp*10); //Todo, scaling OK?
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SOLAX_1872.data.u8[5] = ((max_charge_rate_amp*10) >> 8);
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SOLAX_1872.data.u8[6] = (uint8_t) (max_discharge_rate_amp*10); //Todo, scaling OK?
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SOLAX_1872.data.u8[7] = ((max_discharge_rate_amp*10) >> 8);
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//BMS_PackData
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SOLAX_1873.data.u8[0] = (uint8_t) battery_voltage; //Todo, scaling OK?
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SOLAX_1873.data.u8[1] = (battery_voltage >> 8);
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SOLAX_1873.data.u8[2] = (int8_t) stat_batt_power; //Todo, scaling OK? Signed?
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SOLAX_1873.data.u8[3] = (stat_batt_power >> 8);
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SOLAX_1873.data.u8[4] = (uint8_t) (SOC/100); //SOC (100.00%)
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//SOLAX_1873.data.u8[5] = //Seems like this is not required? Or shall we put SOC decimals here?
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SOLAX_1873.data.u8[6] = (uint8_t) (remaining_capacity_Wh/100); //Todo, scaling OK?
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SOLAX_1873.data.u8[7] = ((remaining_capacity_Wh/100) >> 8);
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//BMS_CellData
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SOLAX_1874.data.u8[0] = (uint8_t) temperature_max;
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SOLAX_1874.data.u8[1] = (temperature_max >> 8);
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SOLAX_1874.data.u8[2] = (uint8_t) temperature_min;
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SOLAX_1874.data.u8[3] = (temperature_min >> 8);
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SOLAX_1874.data.u8[4] = (uint8_t) (cell_max_voltage); //Todo, scaling OK? Supposed to be alarm trigger absolute cell max?
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SOLAX_1874.data.u8[5] = (cell_max_voltage >> 8);
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SOLAX_1874.data.u8[6] = (uint8_t) (cell_min_voltage); //Todo, scaling OK? Supposed to be alarm trigger absolute cell min?
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SOLAX_1874.data.u8[7] = (cell_min_voltage >> 8);
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//BMS_Status
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SOLAX_1875.data.u8[0] = (uint8_t) temperature_average;
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SOLAX_1875.data.u8[1] = (temperature_average >> 8);
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SOLAX_1875.data.u8[2] = (uint8_t) 0; // Number of slave batteries
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SOLAX_1875.data.u8[4] = (uint8_t) 0; // Contactor Status 0=off, 1=on.
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//BMS_PackTemps (strange name, since it has voltages?)
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SOLAX_1876.data.u8[2] = (uint8_t) cell_max_voltage; //Todo, scaling OK?
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SOLAX_1876.data.u8[3] = (cell_min_voltage >> 8);
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SOLAX_1876.data.u8[6] = (uint8_t) cell_min_voltage; //Todo, scaling OK?
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SOLAX_1876.data.u8[7] = (cell_min_voltage >> 8);
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//Unknown
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SOLAX_1877.data.u8[4] = (uint8_t) 0x53;
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SOLAX_1877.data.u8[6] = (BatteryModuleFirmware >> 8);
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SOLAX_1877.data.u8[7] = (uint8_t) BatteryModuleFirmware;
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//BMS_PackStats
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SOLAX_1878.data.u8[0] = (uint8_t) (battery_voltage/10); //TODO, should this be max or current voltage?
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SOLAX_1878.data.u8[1] = ((battery_voltage/10) >> 8);
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SOLAX_1878.data.u8[4] = (uint8_t) capacity_Wh; //TODO, scaling OK?
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SOLAX_1878.data.u8[5] = (capacity_Wh >> 8);
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// BMS_Answer
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SOLAX_1801.data.u8[0] = 2;
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SOLAX_1801.data.u8[2] = 1;
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SOLAX_1801.data.u8[4] = 1;
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}
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void receive_can_solax(CAN_frame_t rx_frame)
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{
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if (rx_frame.MsgID == 0x1871) {
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LastFrameTime = millis();
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switch(STATE)
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{
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case(BATTERY_ANNOUNCE):
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Serial.println("Solax Battery State: Announce");
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inverterAllowsContactorClosing = 0;
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SOLAX_1875.data.u8[4] = (0x00); // Inform Inverter: Contactor 0=off, 1=on.
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CAN_WriteFrame(&SOLAX_100A001); //BMS Announce
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CAN_WriteFrame(&SOLAX_1872);
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CAN_WriteFrame(&SOLAX_1873);
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CAN_WriteFrame(&SOLAX_1874);
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CAN_WriteFrame(&SOLAX_1875);
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CAN_WriteFrame(&SOLAX_1876);
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CAN_WriteFrame(&SOLAX_1877);
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CAN_WriteFrame(&SOLAX_1878);
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// Message from the inverter to proceed to contactor closing
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// Byte 4 changes from 0 to 1
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if (rx_frame.data.u64 == Contactor_Close_Payload)
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STATE = WAITING_FOR_CONTACTOR;
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break;
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case(WAITING_FOR_CONTACTOR):
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SOLAX_1875.data.u8[4] = (0x00); // Inform Inverter: Contactor 0=off, 1=on.
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CAN_WriteFrame(&SOLAX_1872);
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CAN_WriteFrame(&SOLAX_1873);
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CAN_WriteFrame(&SOLAX_1874);
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CAN_WriteFrame(&SOLAX_1875);
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CAN_WriteFrame(&SOLAX_1876);
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CAN_WriteFrame(&SOLAX_1877);
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CAN_WriteFrame(&SOLAX_1878);
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CAN_WriteFrame(&SOLAX_1801); // Announce that the battery will be connected
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STATE = CONTACTOR_CLOSED; // Jump to Contactor Closed State
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Serial.println("Solax Battery State: Contactor Closed");
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break;
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case(CONTACTOR_CLOSED):
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inverterAllowsContactorClosing = 1;
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SOLAX_1875.data.u8[4] = (0x01); // Inform Inverter: Contactor 0=off, 1=on.
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CAN_WriteFrame(&SOLAX_1872);
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CAN_WriteFrame(&SOLAX_1873);
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CAN_WriteFrame(&SOLAX_1874);
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CAN_WriteFrame(&SOLAX_1875);
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CAN_WriteFrame(&SOLAX_1876);
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CAN_WriteFrame(&SOLAX_1877);
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CAN_WriteFrame(&SOLAX_1878);
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// Message from the inverter to open contactor
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// Byte 4 changes from 1 to 0
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if (rx_frame.data.u64 == Contactor_Open_Payload)
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STATE = BATTERY_ANNOUNCE;
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break;
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}
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}
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}
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