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Tasmota/sonoff/xsns_23_sdm120.ino

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/*
xsns_23_sdm120.ino - Eastron SDM120-Modbus energy meter support for Sonoff-Tasmota
Copyright (C) 2018 Gennaro Tortone
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_SDM120
/*********************************************************************************************\
* Eastron SDM120-Modbus energy meter
*
* Based on: https://github.com/reaper7/SDM_Energy_Meter
\*********************************************************************************************/
#include <TasmotaSerial.h>
TasmotaSerial *SDM120Serial;
uint8_t sdm120_type = 1;
//uint8_t sdm120_state = 0;
float sdm120_voltage = 0;
float sdm120_current = 0;
float sdm120_active_power = 0;
float sdm120_apparent_power = 0;
float sdm120_reactive_power = 0;
float sdm120_power_factor = 0;
float sdm120_frequency = 0;
float sdm120_energy_total = 0;
bool SDM120_ModbusReceiveReady()
{
return (SDM120Serial->available() > 1);
}
void SDM120_ModbusSend(uint8_t function_code, uint16_t start_address, uint16_t register_count)
{
uint8_t frame[8];
frame[0] = 0x01; // default SDM120 Modbus address
frame[1] = function_code;
frame[2] = (uint8_t)(start_address >> 8);
frame[3] = (uint8_t)(start_address);
frame[4] = (uint8_t)(register_count >> 8);
frame[5] = (uint8_t)(register_count);
uint16_t crc = SDM120_calculateCRC(frame, 6); // calculate out crc only from first 6 bytes
frame[6] = lowByte(crc);
frame[7] = highByte(crc);
while (SDM120Serial->available() > 0) { // read serial if any old data is available
SDM120Serial->read();
}
SDM120Serial->flush();
SDM120Serial->write(frame, sizeof(frame));
}
uint8_t SDM120_ModbusReceive(float *value)
{
uint8_t buffer[9];
*value = NAN;
uint8_t len = 0;
while (SDM120Serial->available() > 0) {
buffer[len++] = (uint8_t)SDM120Serial->read();
}
if (len < 9)
return 3; // SDM_ERR_NOT_ENOUGHT_BYTES
if (len == 9) {
if (buffer[0] == 0x01 && buffer[1] == 0x04 && buffer[2] == 4) { // check node number, op code and reply bytes count
if((SDM120_calculateCRC(buffer, 7)) == ((buffer[8] << 8) | buffer[7])) { //calculate crc from first 7 bytes and compare with received crc (bytes 7 & 8)
((uint8_t*)value)[3] = buffer[3];
((uint8_t*)value)[2] = buffer[4];
((uint8_t*)value)[1] = buffer[5];
((uint8_t*)value)[0] = buffer[6];
} else return 1; // SDM_ERR_CRC_ERROR
} else return 2; // SDM_ERR_WRONG_BYTES
}
return 0; // SDM_ERR_NO_ERROR
}
uint16_t SDM120_calculateCRC(uint8_t *frame, uint8_t num)
{
uint16_t crc, flag;
crc = 0xFFFF;
for (uint8_t i = 0; i < num; i++) {
crc ^= frame[i];
for (uint8_t j = 8; j; j--) {
if ((crc & 0x0001) != 0) { // If the LSB is set
crc >>= 1; // Shift right and XOR 0xA001
crc ^= 0xA001;
} else { // Else LSB is not set
crc >>= 1; // Just shift right
}
}
}
return crc;
}
/*********************************************************************************************/
const uint16_t sdm120_start_addresses[] {
0x0000, // SDM120C_VOLTAGE [V]
0x0006, // SDM120C_CURRENT [A]
0x000C, // SDM120C_POWER [W]
0x0012, // SDM120C_APPARENT_POWER [VA]
0x0018, // SDM120C_REACTIVE_POWER [VAR]
0x001E, // SDM120C_POWER_FACTOR
0x0046, // SDM120C_FREQUENCY [Hz]
0x0156 // SDM120C_TOTAL_ACTIVE_ENERGY [Wh]
};
uint8_t sdm120_read_state = 0;
uint8_t sdm120_send_retry = 0;
void SDM120250ms() // Every 250 mSec
{
// sdm120_state++;
// if (6 == sdm120_state) { // Every 300 mSec
// sdm120_state = 0;
float value = 0;
bool data_ready = SDM120_ModbusReceiveReady();
if (data_ready) {
uint8_t error = SDM120_ModbusReceive(&value);
if (error) {
snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DEBUG "SDM120 response error %d"), error);
AddLog(LOG_LEVEL_DEBUG);
} else {
switch(sdm120_read_state) {
case 0:
sdm120_voltage = value;
break;
case 1:
sdm120_current = value;
break;
case 2:
sdm120_active_power = value;
break;
case 3:
sdm120_apparent_power = value;
break;
case 4:
sdm120_reactive_power = value;
break;
case 5:
sdm120_power_factor = value;
break;
case 6:
sdm120_frequency = value;
break;
case 7:
sdm120_energy_total = value;
break;
} // end switch
sdm120_read_state++;
if (sizeof(sdm120_start_addresses)/2 == sdm120_read_state) {
sdm120_read_state = 0;
}
}
} // end data ready
if (0 == sdm120_send_retry || data_ready) {
sdm120_send_retry = 5;
SDM120_ModbusSend(0x04, sdm120_start_addresses[sdm120_read_state], 2);
} else {
sdm120_send_retry--;
}
// } // end 300 ms
}
void SDM120Init()
{
sdm120_type = 0;
if ((pin[GPIO_SDM120_RX] < 99) && (pin[GPIO_SDM120_TX] < 99)) {
SDM120Serial = new TasmotaSerial(pin[GPIO_SDM120_RX], pin[GPIO_SDM120_TX], 1);
#ifdef SDM120_SPEED
if (SDM120Serial->begin(SDM120_SPEED)) {
#else
if (SDM120Serial->begin(2400)) {
#endif
if (SDM120Serial->hardwareSerial()) { ClaimSerial(); }
sdm120_type = 1;
}
}
}
#ifdef USE_WEBSERVER
const char HTTP_SNS_SDM120_DATA[] PROGMEM = "%s"
"{s}SDM120 " D_VOLTAGE "{m}%s " D_UNIT_VOLT "{e}"
"{s}SDM120 " D_CURRENT "{m}%s " D_UNIT_AMPERE "{e}"
"{s}SDM120 " D_POWERUSAGE_ACTIVE "{m}%s " D_UNIT_WATT "{e}"
"{s}SDM120 " D_POWERUSAGE_APPARENT "{m}%s " D_UNIT_VA "{e}"
"{s}SDM120 " D_POWERUSAGE_REACTIVE "{m}%s " D_UNIT_VAR "{e}"
"{s}SDM120 " D_POWER_FACTOR "{m}%s{e}"
"{s}SDM120 " D_FREQUENCY "{m}%s " D_UNIT_HERTZ "{e}"
"{s}SDM120 " D_ENERGY_TOTAL "{m}%s " D_UNIT_KILOWATTHOUR "{e}";
#endif // USE_WEBSERVER
void SDM120Show(boolean json)
{
char voltage[10];
char current[10];
char active_power[10];
char apparent_power[10];
char reactive_power[10];
char power_factor[10];
char frequency[10];
char energy_total[10];
dtostrfd(sdm120_voltage, Settings.flag2.voltage_resolution, voltage);
dtostrfd(sdm120_current, Settings.flag2.current_resolution, current);
dtostrfd(sdm120_active_power, Settings.flag2.wattage_resolution, active_power);
dtostrfd(sdm120_apparent_power, Settings.flag2.wattage_resolution, apparent_power);
dtostrfd(sdm120_reactive_power, Settings.flag2.wattage_resolution, reactive_power);
dtostrfd(sdm120_power_factor, 2, power_factor);
dtostrfd(sdm120_frequency, Settings.flag2.frequency_resolution, frequency);
dtostrfd(sdm120_energy_total, Settings.flag2.energy_resolution, energy_total);
if (json) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"" D_RSLT_ENERGY "\":{\"" D_JSON_TOTAL "\":%s,\"" D_JSON_ACTIVE_POWERUSAGE "\":%s,\"" D_JSON_APPARENT_POWERUSAGE "\":%s,\"" D_JSON_REACTIVE_POWERUSAGE "\":%s,\"" D_JSON_FREQUENCY "\":%s,\"" D_JSON_POWERFACTOR "\":%s,\"" D_JSON_VOLTAGE "\":%s,\"" D_JSON_CURRENT "\":%s}"),
mqtt_data, energy_total, active_power, apparent_power, reactive_power, frequency, power_factor, voltage, current);
#ifdef USE_DOMOTICZ
if (0 == tele_period) {
DomoticzSensor(DZ_VOLTAGE, voltage);
DomoticzSensor(DZ_CURRENT, current);
DomoticzSensorPowerEnergy((int)sdm120_active_power, energy_total);
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SDM120_DATA, mqtt_data, voltage, current, active_power, apparent_power, reactive_power, power_factor, frequency, energy_total);
#endif // USE_WEBSERVER
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
#define XSNS_23
boolean Xsns23(byte function)
{
boolean result = false;
if (sdm120_type) {
switch (function) {
case FUNC_INIT:
SDM120Init();
break;
case FUNC_EVERY_250_MSECOND:
SDM120250ms();
break;
case FUNC_JSON_APPEND:
SDM120Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_APPEND:
SDM120Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_SDM120
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