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Battery-Emulator/Software/src/inverter/SOLAX-CAN.cpp
Daniel 3aa5704d74 Refactor CAN inverter handling
2024-04-29 21:02:37 +03:00

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#include "../include.h"
#ifdef SOLAX_CAN
#include "../datalayer/datalayer.h"
#include "../devboard/utils/events.h"
#include "SOLAX-CAN.h"
/* Do not change code below unless you are sure what you are doing */
static uint16_t max_charge_rate_amp = 0;
static uint16_t max_discharge_rate_amp = 0;
static int16_t temperature_average = 0;
static uint8_t STATE = BATTERY_ANNOUNCE;
static unsigned long LastFrameTime = 0;
static uint8_t number_of_batteries = 1;
static uint16_t capped_capacity_Wh;
static uint16_t capped_remaining_capacity_Wh;
//CAN message translations from this amazing repository: https://github.com/rand12345/solax_can_bus
CAN_frame_t SOLAX_1801 = {.FIR = {.B =
{
.DLC = 8,
.FF = CAN_frame_ext,
}},
.MsgID = 0x1801,
.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}};
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
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
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
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
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
CAN_frame_t SOLAX_1877 = {.FIR = {.B =
{
.DLC = 8,
.FF = CAN_frame_ext,
}},
.MsgID = 0x1877,
.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}};
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
CAN_frame_t SOLAX_1879 = {.FIR = {.B =
{
.DLC = 8,
.FF = CAN_frame_ext,
}},
.MsgID = 0x1879,
.data = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}};
CAN_frame_t SOLAX_1881 = {.FIR = {.B =
{
.DLC = 8,
.FF = CAN_frame_ext,
}},
.MsgID = 0x1881,
.data = {0x10, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}; // E.g.: 0 6 S B M S F A
CAN_frame_t SOLAX_1882 = {.FIR = {.B =
{
.DLC = 8,
.FF = CAN_frame_ext,
}},
.MsgID = 0x1882,
.data = {0x10, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}; // E.g.: 0 2 3 A B 0 5 2
CAN_frame_t SOLAX_100A001 = {.FIR = {.B =
{
.DLC = 0,
.FF = CAN_frame_ext,
}},
.MsgID = 0x100A001,
.data = {}};
// __builtin_bswap64 needed to convert to ESP32 little endian format
// Byte[4] defines the requested contactor state: 1 = Closed , 0 = Open
#define Contactor_Open_Payload __builtin_bswap64(0x0200010000000000)
#define Contactor_Close_Payload __builtin_bswap64(0x0200010001000000)
void CAN_WriteFrame(CAN_frame_t* tx_frame) {
#ifdef DUAL_CAN
CANMessage MCP2515Frame; //Struct with ACAN2515 library format, needed to use the MCP2515 library
MCP2515Frame.id = tx_frame->MsgID;
MCP2515Frame.ext = tx_frame->FIR.B.FF;
MCP2515Frame.len = tx_frame->FIR.B.DLC;
for (uint8_t i = 0; i < MCP2515Frame.len; i++) {
MCP2515Frame.data[i] = tx_frame->data.u8[i];
}
can.tryToSend(MCP2515Frame);
#else
ESP32Can.CANWriteFrame(tx_frame);
#endif
}
void update_values_can_inverter() { //This function maps all the values fetched from battery CAN to the correct CAN messages
// If not receiveing any communication from the inverter, open contactors and return to battery announce state
if (millis() - LastFrameTime >= SolaxTimeout) {
datalayer.system.status.inverter_allows_contactor_closing = false;
STATE = BATTERY_ANNOUNCE;
#ifndef DUAL_CAN
ESP32Can.CANStop(); // Baud rate switching might have taken down the interface. Reboot it!
ESP32Can.CANInit(); // TODO: Incase this gets implemented in ESP32Can.cpp, remove these two lines!
#endif
}
//Calculate the required values
temperature_average =
((datalayer.battery.status.temperature_max_dC + datalayer.battery.status.temperature_min_dC) / 2);
//datalayer.battery.status.max_charge_power_W (30000W max)
if (datalayer.battery.status.reported_soc > 9999) //99.99%
{ //Additional safety incase SOC% is 100, then do not charge battery further
max_charge_rate_amp = 0;
} else { //We can pass on the battery charge rate (in W) to the inverter (that takes A)
if (datalayer.battery.status.max_charge_power_W >= 30000) {
max_charge_rate_amp = 75; //Incase battery can take over 30kW, cap value to 75A
} else { //Calculate the W value into A
max_charge_rate_amp =
(datalayer.battery.status.max_charge_power_W / (datalayer.battery.status.voltage_dV * 0.1)); // P/U = I
}
}
//datalayer.battery.status.max_discharge_power_W (30000W max)
if (datalayer.battery.status.reported_soc < 100) //1.00%
{ //Additional safety incase SOC% is below 1, then do not charge battery further
max_discharge_rate_amp = 0;
} else { //We can pass on the battery discharge rate to the inverter
if (datalayer.battery.status.max_discharge_power_W >= 30000) {
max_discharge_rate_amp = 75; //Incase battery can be charged with over 30kW, cap value to 75A
} else { //Calculate the W value into A
max_discharge_rate_amp =
(datalayer.battery.status.max_discharge_power_W / (datalayer.battery.status.voltage_dV * 0.1)); // P/U = I
}
}
// Batteries might be larger than uint16_t value can take
if (datalayer.battery.info.total_capacity_Wh > 65000) {
capped_capacity_Wh = 65000;
} else {
capped_capacity_Wh = datalayer.battery.info.total_capacity_Wh;
}
// Batteries might be larger than uint16_t value can take
if (datalayer.battery.status.remaining_capacity_Wh > 65000) {
capped_remaining_capacity_Wh = 65000;
} else {
capped_remaining_capacity_Wh = datalayer.battery.status.remaining_capacity_Wh;
}
//Put the values into the CAN messages
//BMS_Limits
SOLAX_1872.data.u8[0] = (uint8_t)datalayer.battery.info.max_design_voltage_dV;
SOLAX_1872.data.u8[1] = (datalayer.battery.info.max_design_voltage_dV >> 8);
SOLAX_1872.data.u8[2] = (uint8_t)datalayer.battery.info.min_design_voltage_dV;
SOLAX_1872.data.u8[3] = (datalayer.battery.info.min_design_voltage_dV >> 8);
SOLAX_1872.data.u8[4] = (uint8_t)(max_charge_rate_amp * 10);
SOLAX_1872.data.u8[5] = ((max_charge_rate_amp * 10) >> 8);
SOLAX_1872.data.u8[6] = (uint8_t)(max_discharge_rate_amp * 10);
SOLAX_1872.data.u8[7] = ((max_discharge_rate_amp * 10) >> 8);
//BMS_PackData
SOLAX_1873.data.u8[0] = (uint8_t)datalayer.battery.status.voltage_dV; // OK
SOLAX_1873.data.u8[1] = (datalayer.battery.status.voltage_dV >> 8);
SOLAX_1873.data.u8[2] = (int8_t)datalayer.battery.status.current_dA; // OK, Signed (Active current in Amps x 10)
SOLAX_1873.data.u8[3] = (datalayer.battery.status.current_dA >> 8);
SOLAX_1873.data.u8[4] = (uint8_t)(datalayer.battery.status.reported_soc / 100); //SOC (100.00%)
//SOLAX_1873.data.u8[5] = //Seems like this is not required? Or shall we put SOC decimals here?
SOLAX_1873.data.u8[6] = (uint8_t)(capped_remaining_capacity_Wh / 100);
SOLAX_1873.data.u8[7] = ((capped_remaining_capacity_Wh / 100) >> 8);
//BMS_CellData
SOLAX_1874.data.u8[0] = (int8_t)datalayer.battery.status.temperature_max_dC;
SOLAX_1874.data.u8[1] = (datalayer.battery.status.temperature_max_dC >> 8);
SOLAX_1874.data.u8[2] = (int8_t)datalayer.battery.status.temperature_min_dC;
SOLAX_1874.data.u8[3] = (datalayer.battery.status.temperature_min_dC >> 8);
SOLAX_1874.data.u8[4] = (uint8_t)(datalayer.battery.status.cell_max_voltage_mV);
SOLAX_1874.data.u8[5] = (datalayer.battery.status.cell_max_voltage_mV >> 8);
SOLAX_1874.data.u8[6] = (uint8_t)(datalayer.battery.status.cell_min_voltage_mV);
SOLAX_1874.data.u8[7] = (datalayer.battery.status.cell_min_voltage_mV >> 8);
//BMS_Status
SOLAX_1875.data.u8[0] = (uint8_t)temperature_average;
SOLAX_1875.data.u8[1] = (temperature_average >> 8);
SOLAX_1875.data.u8[2] = (uint8_t)0; // Number of slave batteries
SOLAX_1875.data.u8[4] = (uint8_t)0; // Contactor Status 0=off, 1=on.
//BMS_PackTemps (strange name, since it has voltages?)
SOLAX_1876.data.u8[2] = (uint8_t)datalayer.battery.status.cell_max_voltage_mV;
SOLAX_1876.data.u8[3] = (datalayer.battery.status.cell_max_voltage_mV >> 8);
SOLAX_1876.data.u8[6] = (uint8_t)datalayer.battery.status.cell_min_voltage_mV;
SOLAX_1876.data.u8[7] = (datalayer.battery.status.cell_min_voltage_mV >> 8);
//Unknown
SOLAX_1877.data.u8[4] = (uint8_t)0x50; // Battery type
SOLAX_1877.data.u8[6] = (uint8_t)0x22; // Firmware version?
SOLAX_1877.data.u8[7] =
(uint8_t)0x02; // The above firmware version applies to:02 = Master BMS, 10 = S1, 20 = S2, 30 = S3, 40 = S4
//BMS_PackStats
SOLAX_1878.data.u8[0] = (uint8_t)(datalayer.battery.status.voltage_dV);
SOLAX_1878.data.u8[1] = ((datalayer.battery.status.voltage_dV) >> 8);
SOLAX_1878.data.u8[4] = (uint8_t)capped_capacity_Wh;
SOLAX_1878.data.u8[5] = (capped_capacity_Wh >> 8);
// BMS_Answer
SOLAX_1801.data.u8[0] = 2;
SOLAX_1801.data.u8[2] = 1;
SOLAX_1801.data.u8[4] = 1;
}
void send_can_inverter() {
// No periodic sending used on this protocol, we react only on incoming CAN messages!
}
void receive_can_inverter(CAN_frame_t rx_frame) {
if (rx_frame.MsgID == 0x1871 && rx_frame.data.u8[0] == (0x01) ||
rx_frame.MsgID == 0x1871 && rx_frame.data.u8[0] == (0x02)) {
LastFrameTime = millis();
switch (STATE) {
case (BATTERY_ANNOUNCE):
#ifdef DEBUG_VIA_USB
Serial.println("Solax Battery State: Announce");
#endif
datalayer.system.status.inverter_allows_contactor_closing = false;
SOLAX_1875.data.u8[4] = (0x00); // Inform Inverter: Contactor 0=off, 1=on.
for (int i = 0; i <= number_of_batteries; i++) {
CAN_WriteFrame(&SOLAX_1872);
CAN_WriteFrame(&SOLAX_1873);
CAN_WriteFrame(&SOLAX_1874);
CAN_WriteFrame(&SOLAX_1875);
CAN_WriteFrame(&SOLAX_1876);
CAN_WriteFrame(&SOLAX_1877);
CAN_WriteFrame(&SOLAX_1878);
}
CAN_WriteFrame(&SOLAX_100A001); //BMS Announce
// Message from the inverter to proceed to contactor closing
// Byte 4 changes from 0 to 1
if (rx_frame.data.u64 == Contactor_Close_Payload)
STATE = WAITING_FOR_CONTACTOR;
break;
case (WAITING_FOR_CONTACTOR):
SOLAX_1875.data.u8[4] = (0x00); // Inform Inverter: Contactor 0=off, 1=on.
CAN_WriteFrame(&SOLAX_1872);
CAN_WriteFrame(&SOLAX_1873);
CAN_WriteFrame(&SOLAX_1874);
CAN_WriteFrame(&SOLAX_1875);
CAN_WriteFrame(&SOLAX_1876);
CAN_WriteFrame(&SOLAX_1877);
CAN_WriteFrame(&SOLAX_1878);
CAN_WriteFrame(&SOLAX_1801); // Announce that the battery will be connected
STATE = CONTACTOR_CLOSED; // Jump to Contactor Closed State
#ifdef DEBUG_VIA_USB
Serial.println("Solax Battery State: Contactor Closed");
#endif
break;
case (CONTACTOR_CLOSED):
datalayer.system.status.inverter_allows_contactor_closing = true;
SOLAX_1875.data.u8[4] = (0x01); // Inform Inverter: Contactor 0=off, 1=on.
CAN_WriteFrame(&SOLAX_1872);
CAN_WriteFrame(&SOLAX_1873);
CAN_WriteFrame(&SOLAX_1874);
CAN_WriteFrame(&SOLAX_1875);
CAN_WriteFrame(&SOLAX_1876);
CAN_WriteFrame(&SOLAX_1877);
CAN_WriteFrame(&SOLAX_1878);
// Message from the inverter to open contactor
// Byte 4 changes from 1 to 0
if (rx_frame.data.u64 == Contactor_Open_Payload) {
set_event(EVENT_INVERTER_OPEN_CONTACTOR, 0);
STATE = BATTERY_ANNOUNCE;
}
break;
}
}
if (rx_frame.MsgID == 0x1871 && rx_frame.data.u64 == __builtin_bswap64(0x0500010000000000)) {
CAN_WriteFrame(&SOLAX_1881);
CAN_WriteFrame(&SOLAX_1882);
#ifdef DEBUG_VIA_USB
Serial.println("1871 05-frame received from inverter");
#endif
}
if (rx_frame.MsgID == 0x1871 && rx_frame.data.u8[0] == (0x03)) {
#ifdef DEBUG_VIA_USB
Serial.println("1871 03-frame received from inverter");
#endif
}
}
#endif
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