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SDM.cpp
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SDM.cpp
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/* Library for reading SDM 72/120/220/230/630 Modbus Energy meters.
* Reading via Hardware or Software Serial library & rs232<->rs485 converter
* 2016-2019 Reaper7 (tested on wemos d1 mini->ESP8266 with Arduino 1.8.10 & 2.5.2 esp8266 core)
* crc calculation by Jaime García (https://github.com/peninquen/Modbus-Energy-Monitor-Arduino/)
*/
//------------------------------------------------------------------------------
#include "SDM.h"
//------------------------------------------------------------------------------
#if defined ( USE_HARDWARESERIAL )
#if defined ( ESP8266 )
SDM::SDM(HardwareSerial& serial, long baud, int dere_pin, int config, bool swapuart) : sdmSer(serial) {
this->_baud = baud;
this->_dere_pin = dere_pin;
this->_config = config;
this->_swapuart = swapuart;
}
#elif defined ( ESP32 )
SDM::SDM(HardwareSerial& serial, long baud, int dere_pin, int config, int8_t rx_pin, int8_t tx_pin) : sdmSer(serial) {
this->_baud = baud;
this->_dere_pin = dere_pin;
this->_config = config;
this->_rx_pin = rx_pin;
this->_tx_pin = tx_pin;
}
#else
SDM::SDM(HardwareSerial& serial, long baud, int dere_pin, int config) : sdmSer(serial) {
this->_baud = baud;
this->_dere_pin = dere_pin;
this->_config = config;
}
#endif
#else
#if defined ( ESP8266 ) || defined ( ESP32 )
SDM::SDM(SoftwareSerial& serial, long baud, int dere_pin, int config, int8_t rx_pin, int8_t tx_pin) : sdmSer(serial) {
this->_baud = baud;
this->_dere_pin = dere_pin;
this->_config = config;
this->_rx_pin = rx_pin;
this->_tx_pin = tx_pin;
}
#else
SDM::SDM(SoftwareSerial& serial, long baud, int dere_pin) : sdmSer(serial) {
this->_baud = baud;
this->_dere_pin = dere_pin;
}
#endif
#endif
SDM::~SDM() {
}
void SDM::begin(void) {
#if defined ( USE_HARDWARESERIAL )
#if defined ( ESP8266 )
sdmSer.begin(_baud, (SerialConfig)_config);
#elif defined ( ESP32 )
sdmSer.begin(_baud, _config, _rx_pin, _tx_pin);
#else
sdmSer.begin(_baud, _config);
#endif
#else
#if defined ( ESP8266 ) || defined ( ESP32 )
sdmSer.begin(_baud, (SoftwareSerialConfig)_config, _rx_pin, _tx_pin);
#else
sdmSer.begin(_baud);
#endif
#endif
#if defined ( USE_HARDWARESERIAL ) && defined ( ESP8266 )
if (_swapuart)
sdmSer.swap();
#endif
if (_dere_pin != NOT_A_PIN) {
pinMode(_dere_pin, OUTPUT); //set output pin mode for DE/RE pin when used (for control MAX485)
}
dereSet(LOW); //set init state to receive from SDM -> DE Disable, /RE Enable (for control MAX485)
}
float SDM::readVal(uint16_t reg, uint8_t node) {
uint16_t temp;
unsigned long resptime;
uint8_t sdmarr[FRAMESIZE] = {node, SDM_B_02, 0, 0, SDM_B_05, SDM_B_06, 0, 0, 0};
float res = NAN;
uint16_t readErr = SDM_ERR_NO_ERROR;
sdmarr[2] = highByte(reg);
sdmarr[3] = lowByte(reg);
temp = calculateCRC(sdmarr, FRAMESIZE - 3); //calculate out crc only from first 6 bytes
sdmarr[6] = lowByte(temp);
sdmarr[7] = highByte(temp);
#if !defined ( USE_HARDWARESERIAL )
sdmSer.listen(); //enable softserial rx interrupt
#endif
flush(); //read serial if any old data is available
dereSet(HIGH); //transmit to SDM -> DE Enable, /RE Disable (for control MAX485)
delay(2); //fix for issue (nan reading) by sjfaustino: https://github.com/reaper7/SDM_Energy_Meter/issues/7#issuecomment-272111524
sdmSer.write(sdmarr, FRAMESIZE - 1); //send 8 bytes
sdmSer.flush(); //clear out tx buffer
dereSet(LOW); //receive from SDM -> DE Disable, /RE Enable (for control MAX485)
resptime = millis() + MAX_MILLIS_TO_WAIT;
while (sdmSer.available() < FRAMESIZE) {
if (resptime < millis()) {
readErr = SDM_ERR_TIMEOUT; //err debug (4)
break;
}
yield();
}
if (readErr == SDM_ERR_NO_ERROR) { //if no timeout...
if(sdmSer.available() >= FRAMESIZE) {
for(int n=0; n<FRAMESIZE; n++) {
sdmarr[n] = sdmSer.read();
}
if (sdmarr[0] == node && sdmarr[1] == SDM_B_02 && sdmarr[2] == SDM_REPLY_BYTE_COUNT) {
if ((calculateCRC(sdmarr, FRAMESIZE - 2)) == ((sdmarr[8] << 8) | sdmarr[7])) { //calculate crc from first 7 bytes and compare with received crc (bytes 7 & 8)
((uint8_t*)&res)[3]= sdmarr[3];
((uint8_t*)&res)[2]= sdmarr[4];
((uint8_t*)&res)[1]= sdmarr[5];
((uint8_t*)&res)[0]= sdmarr[6];
} else {
readErr = SDM_ERR_CRC_ERROR; //err debug (1)
}
} else {
readErr = SDM_ERR_WRONG_BYTES; //err debug (2)
}
} else {
readErr = SDM_ERR_NOT_ENOUGHT_BYTES; //err debug (3)
}
}
if (readErr != SDM_ERR_NO_ERROR) { //if error then copy temp error value to global val and increment global error counter
readingerrcode = readErr;
readingerrcount++;
} else {
++readingsuccesscount;
}
flush(); //read serial if any old data is available
#if !defined ( USE_HARDWARESERIAL )
sdmSer.stopListening(); //disable softserial rx interrupt
#endif
return (res);
}
uint16_t SDM::getErrCode(bool _clear) {
uint16_t _tmp = readingerrcode;
if (_clear == true)
clearErrCode();
return (_tmp);
}
uint16_t SDM::getErrCount(bool _clear) {
uint16_t _tmp = readingerrcount;
if (_clear == true)
clearErrCount();
return (_tmp);
}
uint16_t SDM::getSuccCount(bool _clear) {
uint16_t _tmp = readingsuccesscount;
if (_clear == true)
clearSuccCount();
return (_tmp);
}
void SDM::clearErrCode() {
readingerrcode = SDM_ERR_NO_ERROR;
}
void SDM::clearErrCount() {
readingerrcount = 0;
}
void SDM::clearSuccCount() {
readingsuccesscount = 0;
}
uint16_t SDM::calculateCRC(uint8_t *array, uint8_t num) {
uint16_t _crc, _flag;
_crc = 0xFFFF;
for (uint8_t i = 0; i < num; i++) {
_crc = _crc ^ array[i];
for (uint8_t j = 8; j; j--) {
_flag = _crc & 0x0001;
_crc >>= 1;
if (_flag)
_crc ^= 0xA001;
}
}
return _crc;
}
void SDM::flush() {
uint8_t _i = 0;
while (sdmSer.available() && _i++ < 10) { //read serial if any old data is available
sdmSer.read();
delay(1);
}
}
void SDM::dereSet(bool _state) {
if (_dere_pin != NOT_A_PIN)
digitalWrite(_dere_pin, _state); //receive from SDM -> DE Disable, /RE Enable (for control MAX485)
}