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Tasmota/tasmota/tasmota_xsns_sensor/xsns_87_mcp2515.ino

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/*
xsns_87_mcp2515.ino - MCP2515 CAN bus support for Tasmota
Copyright (C) 2021 Marius Bezuidenhout
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_SPI
#ifdef USE_MCP2515
#ifdef USE_CANSNIFFER
#undef USE_CANSNIFFER
#warning **** USE_CANSNIFFER disabled in favour of USE_MCP2515 ****
#endif
/*********************************************************************************************\
* MCP2515 - Microchip CAN controller
*
* Connections:
* MCP2515 ESP8266 Tasmota
* ------- -------------- ----------
* INT not used
* SCK GPIO14 SPI CLK
* SI GPIO13 SPI MOSI
* SO GPIO12 SPI MISO
* CS GPIO0..5,15,16 MCP2515
* Gnd Gnd
* VCC Vin/5V
\*********************************************************************************************/
#define XSNS_87 87
// set defaults if not defined
#ifndef MCP2515_BITRATE
#define MCP2515_BITRATE CAN_500KBPS
#endif
#ifndef MCP2515_CLOCK
#define MCP2515_CLOCK MCP_8MHZ
#endif
#ifndef MCP2515_MAX_FRAMES
#define MCP2515_MAX_FRAMES 14
#endif
#ifndef CAN_KEEP_ALIVE_SECS
#define CAN_KEEP_ALIVE_SECS 300
#endif
#ifndef MCP2515_TIMEOUT
#define MCP2515_TIMEOUT 10
#endif
#ifndef MCP2515_BMS_CLIENT
#define MCP2515_BMS_CLIENT
// Look for Freedom Won BMS data in CAN message
#ifndef MCP2515_BMS_FREEDWON
#define MCP2515_BMS_FREEDWON
#endif // MCP2515_BMS_FREEDWON
#endif // MCP2515_BMS_CLIENT
#include "mcp2515.h"
#ifdef MCP2515_BMS_CLIENT
#define BMS_NAME 0x1
#define BMS_SOC 0x2
#define BMS_SOH 0x4
#define BMS_CHARGE_VOLT_MAX 0x8
#define BMS_CHARGE_VOLT_MIN 0x10
#define BMS_CHARGE_AMP_MAX 0x20
#define BMS_DISCHARGE_AMP_MAX 0x40
#define BMS_VOLT 0x80
#define BMS_AMP 0x100
#define BMS_TEMP 0x200
#define BMS_CAPACITY 0x400
#define BMS_MODEL 0x800
#define BMS_FIRMWARE_VER 0x1000
#define BMS_MANUFACTURER 0x2000
#define BMS_SERIAL 0x4000
struct BMS_Struct {
uint16_t setFields; // Bitwise fields set list
char name[17];
uint16_t stateOfCharge;
uint16_t stateOfHealth;
uint16_t chargeVoltLimit; // Div 10
uint16_t dischargeVolt; // Div 10
int16_t maxChargeCurrent; // Div 10
int16_t maxDischargeCurrent; // Div 10
uint16_t battVoltage; // Div 100
int16_t battAmp; // Div 10
int16_t battTemp; // Div 10
uint16_t capacityAh;
uint16_t model;
uint16_t firmwareVer;
char manuf[9];
char serialNr[17];
} bms;
#endif
struct MCP2515_Struct {
uint32_t lastFrameRecv = 0;
int8_t init_status = 0;
} Mcp2515;
struct can_frame canFrame;
MCP2515 *mcp2515 = nullptr;
char c2h(char c)
{
return "0123456789ABCDEF"[0x0F & (unsigned char)c];
}
void MCP2515_FrameSizeError(uint8_t len, uint32_t id) {
AddLog(LOG_LEVEL_DEBUG, PSTR("CAN: Unexpected length (%d) for ID 0x%x"), len, id);
}
void MCP2515_Init(void) {
if (PinUsed(GPIO_MCP2515_CS, GPIO_ANY) && TasmotaGlobal.spi_enabled) {
mcp2515 = new MCP2515(5);
if (MCP2515::ERROR_OK != mcp2515->reset()) {
AddLog(LOG_LEVEL_INFO, PSTR("CAN: Failed to reset module"));
return;
}
if (MCP2515::ERROR_OK != mcp2515->setBitrate(MCP2515_BITRATE, MCP2515_CLOCK)) {
AddLog(LOG_LEVEL_INFO, PSTR("CAN: Failed to set module bitrate"));
return;
}
if (MCP2515::ERROR_OK != mcp2515->setNormalMode()) {
AddLog(LOG_LEVEL_INFO, PSTR("CAN: Failed to set normal mode"));
return;
}
AddLog(LOG_LEVEL_INFO, PSTR("CAN: Initialized"));
#ifdef MCP2515_BMS_FREEDWON
// TODO: Filter CAN bus messages
//mcp2515->setFilterMask();
//mcp2515->setFilter();
#endif
}
}
void MCP2515_Read() {
uint8_t nCounter = 0;
bool checkRcv;
checkRcv = mcp2515->checkReceive();
while (checkRcv && nCounter <= MCP2515_MAX_FRAMES) {
mcp2515->checkReceive();
nCounter++;
if (mcp2515->readMessage(&canFrame) == MCP2515::ERROR_OK) {
Mcp2515.lastFrameRecv = TasmotaGlobal.uptime;
#ifdef MCP2515_BMS_CLIENT
#ifdef MCP2515_BMS_FREEDWON
switch (canFrame.can_id) {
// Charge/Discharge parameters
case 0x351:
if (8 == canFrame.can_dlc) {
bms.chargeVoltLimit = (canFrame.data[1] << 8) | canFrame.data[0];
bms.maxChargeCurrent = (canFrame.data[3] << 8) | canFrame.data[2];
bms.maxDischargeCurrent = (canFrame.data[5] << 8) | canFrame.data[4];
bms.dischargeVolt = (canFrame.data[7] << 8) | canFrame.data[6];
bms.setFields |= BMS_CHARGE_VOLT_MAX | BMS_CHARGE_VOLT_MIN | BMS_CHARGE_AMP_MAX | BMS_DISCHARGE_AMP_MAX;
} else {
MCP2515_FrameSizeError(canFrame.can_dlc, canFrame.can_id);
}
break;
// State of Charge/Health
case 0x355:
if (6 >= canFrame.can_dlc) {
bms.stateOfCharge = (canFrame.data[1] << 8) | canFrame.data[0];
bms.stateOfHealth = (canFrame.data[3] << 8) | canFrame.data[2];
bms.setFields |= BMS_SOC | BMS_SOH;
} else {
MCP2515_FrameSizeError(canFrame.can_dlc, canFrame.can_id);
}
break;
// Voltage/Current/Temperature
case 0x356:
if (6 >= canFrame.can_dlc) {
bms.battVoltage = (canFrame.data[1] << 8) | canFrame.data[0];
bms.battAmp = (canFrame.data[3] << 8) | canFrame.data[2];
bms.battTemp = (canFrame.data[5] << 8) | canFrame.data[4]; // Convert to fahrenheit if SetOpion8 is set
bms.setFields |= BMS_VOLT | BMS_AMP | BMS_TEMP;
} else {
MCP2515_FrameSizeError(canFrame.can_dlc, canFrame.can_id);
}
break;
// Manufacturer name
case 0x35E:
for (int i = 0; i < canFrame.can_dlc; i++) {
bms.manuf[i] = canFrame.data[i];
}
bms.setFields |= BMS_MANUFACTURER;
bms.manuf[8] = 0; // Ensure that name is null terminated
break;
// Battery Model / Firmware version
case 0x35F:
if (4 == canFrame.can_dlc) {
bms.model = (canFrame.data[1] << 8) | canFrame.data[0];
bms.firmwareVer = (canFrame.data[3] << 8) | canFrame.data[2];
bms.setFields |= BMS_MODEL | BMS_FIRMWARE_VER;
} else {
MCP2515_FrameSizeError(canFrame.can_dlc, canFrame.can_id);
}
break;
// Battery / BMS name
case 0x370:
case 0x371:
for (int i = 0; i < canFrame.can_dlc; i++) {
uint8_t nameStrPos = i + ((canFrame.can_id & 0x1) * 8); // If can_id is 0x371 then fill from byte 8 onwards
bms.name[nameStrPos] = canFrame.data[i];
}
if ((canFrame.can_id & 0x1) && (bms.name[0] > 0)) { // Upper and lower part of name has been set now
bms.setFields |= BMS_NAME;
}
bms.name[16] = 0; // Ensure that name is null terminated
break;
// Modules status
case 0x372:
// Min/Max cell voltage/temperature
case 0x373:
// Min. cell voltage id string
case 0x374:
// Max. cell voltage id string
case 0x375:
// Min. cell temperature id string
case 0x376:
// Max. cell temperature id string
case 0x377:
break;
// Installed capacity
case 0x379:
if (2 >= canFrame.can_dlc) {
bms.capacityAh = (canFrame.data[1] << 8) | canFrame.data[0];
bms.setFields |= BMS_CAPACITY;
} else {
MCP2515_FrameSizeError(canFrame.can_dlc, canFrame.can_id);
}
break;
// Serial number
case 0x380:
case 0x381:
for (int i = 0; i < canFrame.can_dlc; i++) {
uint8_t serialNrStrPos = i + ((canFrame.can_id & 0x1) * 8); // If can_id is 0x381 then fill from byte 8 onwards
bms.serialNr[serialNrStrPos] = canFrame.data[i];
}
if ((canFrame.can_id & 0x1) && (bms.serialNr[0] > 0)) { // Upper and lower part of serial number has been set now
bms.setFields |= BMS_SERIAL;
}
bms.serialNr[16] = 0; // Ensure that serial nr is null terminated
break;
default:
char canMsg[17];
canMsg[0] = 0;
for (int i = 0; i < canFrame.can_dlc; i++) {
canMsg[i*2] = c2h(canFrame.data[i]>>4);
canMsg[i*2+1] = c2h(canFrame.data[i]);
}
if (canFrame.can_dlc > 0) {
canMsg[(canFrame.can_dlc - 1) * 2 + 2] = 0;
}
AddLog(LOG_LEVEL_DEBUG, PSTR("CAN: Received message 0x%s from ID 0x%x"), canMsg, (uint32_t)canFrame.can_id);
break;
}
#endif // MCP2515_BMS_FREEDWON
#endif // MCP2515_BMS_CLIENT
} else if (mcp2515->checkError()) {
uint8_t errFlags = mcp2515->getErrorFlags();
mcp2515->clearRXnOVRFlags();
AddLog(LOG_LEVEL_DEBUG, PSTR("CAN: Received error %d"), errFlags);
break;
}
}
#ifdef MCP2515_BMS_FREEDWON
if (!(TasmotaGlobal.uptime%CAN_KEEP_ALIVE_SECS) && TasmotaGlobal.uptime>60) {
canFrame.can_id = 0x305;
canFrame.can_dlc = 0;
if (MCP2515::ERROR_OK != mcp2515->sendMessage(&canFrame)) {
AddLog(LOG_LEVEL_ERROR, PSTR("CAN: Failed to send keep alive frame"));
}
}
#endif
}
void MCP2515_Show(bool Json) {
if (Json) {
if (Mcp2515.lastFrameRecv > 0 && TasmotaGlobal.uptime - Mcp2515.lastFrameRecv <= MCP2515_TIMEOUT) {
#ifdef MCP2515_BMS_CLIENT
if (bms.setFields & BMS_MANUFACTURER) {
bool jsonFirstField = true;
ResponseAppend_P(PSTR(",\"%s\":{"), bms.manuf);
if (bms.setFields & BMS_SOC) {
ResponseAppend_P(PSTR("\"SOC\":%d"), bms.stateOfCharge);
jsonFirstField = false;
}
if (bms.setFields & BMS_SOH) {
ResponseAppend_P(PSTR("%s\"SOH\":%d"), jsonFirstField ? PSTR("") : PSTR(","), bms.stateOfHealth);
jsonFirstField = false;
}
if (bms.setFields & BMS_VOLT) {
ResponseAppend_P(PSTR("%s\"BattVolt\":%d.%d"), jsonFirstField ? PSTR("") : PSTR(","), bms.battVoltage / 100, bms.battVoltage % 100);
jsonFirstField = false;
}
if (bms.setFields & BMS_AMP) {
int8_t bmsModNeg = 1;
if (bms.battAmp < 0) {
bmsModNeg = -1;
}
ResponseAppend_P(PSTR("%s\"BattAmp\":%d.%d"), jsonFirstField ? PSTR("") : PSTR(","), bms.battAmp / 10, (bms.battAmp % 10) * bmsModNeg);
jsonFirstField = false;
}
if (bms.setFields & BMS_TEMP) {
ResponseAppend_P(PSTR("%s\"BattTemp\":%d.%d"), jsonFirstField ? PSTR("") : PSTR(","), bms.battTemp / 10, bms.battTemp % 10);
jsonFirstField = false;
}
if (bms.setFields & BMS_CHARGE_VOLT_MAX) {
ResponseAppend_P(PSTR("%s\"MaxVoltage\":%d.%d"), jsonFirstField ? PSTR("") : PSTR(","), bms.chargeVoltLimit / 10, bms.chargeVoltLimit % 10);
jsonFirstField = false;
}
if (bms.setFields & BMS_CHARGE_VOLT_MIN) {
ResponseAppend_P(PSTR("%s\"MinVoltage\":%d.%d"), jsonFirstField ? PSTR("") : PSTR(","), bms.dischargeVolt / 10, bms.dischargeVolt % 10);
jsonFirstField = false;
}
if (bms.setFields & BMS_CHARGE_AMP_MAX) {
ResponseAppend_P(PSTR("%s\"MaxChargeAmp\":%d.%d"), jsonFirstField ? PSTR("") : PSTR(","), bms.maxChargeCurrent / 10, bms.maxChargeCurrent % 10);
jsonFirstField = false;
}
if (bms.setFields & BMS_DISCHARGE_AMP_MAX) {
ResponseAppend_P(PSTR("%s\"MaxDischargeAmp\":%d.%d"), jsonFirstField ? PSTR("") : PSTR(","), bms.maxDischargeCurrent / 10, bms.maxDischargeCurrent % 10);
jsonFirstField = false;
}
ResponseAppend_P(PSTR("}"));
}
} else {
bms.setFields = 0;
#endif // MCP2515_BMS_CLIENT
}
#ifdef USE_WEBSERVER
} else {
#ifdef MCP2515_BMS_CLIENT
if (bms.setFields & BMS_MANUFACTURER) {
if (bms.setFields & BMS_SOC) {
WSContentSend_PD(HTTP_SNS_SOC, bms.manuf, bms.stateOfCharge);
}
if (bms.setFields & BMS_SOH) {
WSContentSend_PD(HTTP_SNS_SOH, bms.manuf, bms.stateOfHealth);
}
if (bms.setFields & BMS_VOLT) {
WSContentSend_Voltage(bms.manuf, (float(bms.battVoltage) / 100));
}
if (bms.setFields & BMS_AMP) {
char ampStr[6];
dtostrf((float(bms.battAmp) / 10), 5, 1, ampStr);
WSContentSend_PD(PSTR("{s}%s " D_CURRENT "{m}%s " D_UNIT_AMPERE "{e}"), bms.manuf, ampStr);
}
if (bms.setFields & BMS_TEMP) {
WSContentSend_Temp(bms.manuf, ConvertTemp(float(bms.battTemp) / 10));
}
if (bms.setFields & BMS_CHARGE_VOLT_MAX) {
char voltStr[6];
dtostrf((float(bms.chargeVoltLimit) / 10), 5, 1, voltStr);
WSContentSend_PD(PSTR("{s}%s Max Voltage{m}%s " D_UNIT_VOLT "{e}"), bms.manuf, voltStr);
}
if (bms.setFields & BMS_CHARGE_VOLT_MIN) {
char voltStr[6];
dtostrf((float(bms.dischargeVolt) / 10), 5, 1, voltStr);
WSContentSend_PD(PSTR("{s}%s Min Voltage{m}%s " D_UNIT_VOLT "{e}"), bms.manuf, voltStr);
}
if (bms.setFields & BMS_CHARGE_AMP_MAX) {
char ampStr[6];
dtostrf((float(bms.maxChargeCurrent) / 10), 5, 1, ampStr);
WSContentSend_PD(PSTR("{s}%s Max Charge Current{m}%s " D_UNIT_AMPERE "{e}"), bms.manuf, ampStr);
}
if (bms.setFields & BMS_DISCHARGE_AMP_MAX) {
char ampStr[6];
dtostrf((float(bms.maxDischargeCurrent) / 10), 5, 1, ampStr);
WSContentSend_PD(PSTR("{s}%s Max Discharge Current{m}%s " D_UNIT_AMPERE "{e}"), bms.manuf, ampStr);
}
} else {
WSContentSend_PD(PSTR("{s}MCP2515 {m} Waiting for data{e}"));
}
#endif // MCP2515_BMS_CLIENT
#endif // USE_WEBSERVER
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns87(uint8_t function)
{
bool result = false;
if (FUNC_INIT == function) {
MCP2515_Init();
}
else if (Mcp2515.init_status) {
switch (function) {
case FUNC_EVERY_50_MSECOND:
MCP2515_Read();
break;
case FUNC_JSON_APPEND:
MCP2515_Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
MCP2515_Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_MCP2515
#endif // USE_SPI
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