Represents a single device. Take measurements, send commands. Needs SDI12 bus instance as argument. Allows to detect devices on the bus
SDI12_device.h
- Committer:
- amateusz
- Date:
- 2018-07-27
- Revision:
- 2:e2db05bc4708
- Parent:
- 1:6b1a21925a81
- Child:
- 3:2847f7c543d3
File content as of revision 2:e2db05bc4708:
#include "SDI12.h" #include <string> #include "mbed.h" class SDI12_device { public: struct Identification_struct { unsigned char sdi_version; char company[8+1]; char model[6+1]; char version[3+1]; }; struct Measurement_struct { unsigned long timestampMeasurementReadyAt; bool _measurementAlreadyRead; char count; float values[]; }; Identification_struct _ident_struct; static int detect(SDI12 &sdi12, char indices[]) { char found = 0; for (char i = '1'; i < '9'; ++i) { string question = "?!"; question[0] = i; sdi12.sendCommand(question); std::string response; Timer detectTimer; detectTimer.start(); while (sdi12.RxBufferAvailable() == 0) if(detectTimer.read_ms() > 800) { ++i; break; } unsigned char bufferSize = sdi12.RxBufferAvailable(); char buffer[bufferSize]; sdi12.getRxBuffer(buffer); // if first char is valid address char if (buffer[0] >= '0' && buffer[0] <= '9' || buffer[0] >= 'a' && buffer[0] <= 'z' || buffer[0] >= 'A' && buffer[0] <= 'Z') { indices[found++] = buffer[0]; } } return found; }; SDI12_device (SDI12 &inst, char address, EventQueue &mainDispatcher) : _sdi12(inst) { setAddress(address); sensorQueue.chain(&mainDispatcher); if(getIdentification(_ident_struct)); }; // void printIdentification(){ // Serial.println(_ident_struct.company); // Serial.println(_ident_struct.model); // Serial.println(_ident_struct.version); // } // // // returns after how many seconds a measurement will be ready int measure(bool concurrent = true) { std::string question = string("?") + string(concurrent?"C":"M") + string("!"); question[0] = _address; _sdi12.sendCommand(question); Timer timeout; timeout.start(); while (sdi12.RxBufferAvailable() == 0) { if (sdi12.RxInProgress()) timeout.reset(); if(timeout.read_ms() > 100) { return false; } } unsigned char bufferSize = sdi12.RxBufferAvailable(); char buffer[bufferSize+1]; sdi12.getRxBuffer(buffer); buffer[bufferSize] = '\0'; std::string response(buffer); if (response[0] == _address) { char measurementsCount = std::atoi(response.substr(1+3,(concurrent?2:1)).c_str()); char waitFor = std::atoi(response.substr(1,3).c_str()); _measurement.count = measurementsCount; // _measurement.timestampMeasurementReadyAt debug("wait for %d measurement for %d seconds...", _measurement.count, waitFor); sensorQueue.call_in(waitFor * 1000, callback(this, &SDI12_device::read)); if (_measurement.values == NULL) delete[] _measurement.values; return 0; } return -1; }; // // bool isMeasurementReady(){ // return (((unsigned)(_measurement.timestampMeasurementReadyAt - millis())>0)?false:true); // }; // // short unsigned int measurementReadyIn(){ // ms // if (isMeasurementReady()) // return 0; // else{ // return _measurement.timestampMeasurementReadyAt - millis(); // } // }; // bool read() { char alreadyRead = 0; std::string question = string("?") + string("D0") + string("!"); question[0] = _address; _sdi12.sendCommand(question); Timer timeout; timeout.start(); while (sdi12.RxBufferAvailable() == 0) { if (sdi12.RxInProgress()) timeout.reset(); if(timeout.read_ms() > 100) { return false; } } unsigned char bufferSize = sdi12.RxBufferAvailable(); char buffer[bufferSize+1]; sdi12.getRxBuffer(buffer); buffer[bufferSize] = '\0'; std::string response(buffer); debug("parser"); // if (response[0] == _address) { // debug("parser"); // // parser here // response = response.substr(1); // to limit repeting this operation later // // the only two possible delimeters of a value // uint8_t start_index = 0; // // int8_t index_pos = response.indexOf('+', start_index); // int8_t index_neg = response.indexOf('-', start_index); // // Serial.println(index_pos); // Serial.println(index_pos); // // do { // // determine start index: // if (index_pos != -1 && index_neg != -1) start_index = min(index_pos,index_neg); // else if (index_pos == -1) start_index = index_neg; // else if (index_neg == -1) start_index = index_pos; // // int8_t index_pos_next = response.indexOf('+', start_index +1); // int8_t index_neg_next = response.indexOf('-', start_index +1); // // uint8_t end_index; // if (index_pos_next != -1 && index_neg_next != -1) end_index = min(index_pos_next,index_neg_next); // else if (index_pos_next == -1) end_index = index_neg_next; // else if (index_neg_next == -1) end_index = index_pos_next; // // _measurement.values[alreadyRead++] = response.substr(start_index, end_index).toFloat(); // // index_pos = response.indexOf('+', start_index); // index_neg = response.indexOf('-', start_index); // } while(index_pos != -1 || index_neg != -1); // } } // unsigned char getMeasurementCount() { return _measurement.count; } float getMeasurementValue(char which) { return _measurement.values[which]; } void setAddress(char address) { _address = address; }; // // private: SDI12 &_sdi12; char _address; Measurement_struct _measurement; EventQueue sensorQueue; bool getIdentification(Identification_struct &ident) { // _sdi12.sendCommand(std::string(_address) + "I!"); std::string question = "?I!"; question[0] = _address; _sdi12.sendCommand(question); Timer timeout; timeout.start(); while (sdi12.RxBufferAvailable() == 0) { if (sdi12.RxInProgress()) timeout.reset(); if(timeout.read_ms() > 20) { return false; } } unsigned char bufferSize = sdi12.RxBufferAvailable(); char buffer[bufferSize+1]; sdi12.getRxBuffer(buffer); buffer[bufferSize] = '\0'; std::string response(buffer); if (response[0] == _address) { // e.g.: 113DECAGON GS3 402 ident.sdi_version = std::atoi(response.substr(1, 2).c_str()); debug("|%d| /%s/\r\n",ident.sdi_version ,response.substr(1, 2).c_str()); std::string tempStr = response.substr(3, 8); strcpy(ident.company, tempStr.c_str()); tempStr = response.substr(3+8, 6); strcpy(ident.model, tempStr.c_str()); tempStr = response.substr(3+8+6, 3); strcpy(ident.version, tempStr.c_str()); return true; } return false; } };